jdbc by kamalakar dandu

8/2/2019 Jdbc by Kamalakar Dandu

1/57

1 JDBC ver 1.0


2/57

2 JDBC ver 1.0

jdbc is a generic SQL database access framework

in Java

allows applications to query databases, and

manipulate data returned from them

it is based on X/Open SQL Call Level

Interface(CLI) standard (ODBC is also based on

the CLI)

JDBC: An Intro


3/57

3 JDBC ver 1.0

Jdbc

Advantages

Leverage existing enterprises

Reduced Development time

zero configuration for network clients

Key Features

Full access to Metadata

No installation

Database connection identified by URL style

Included in the java platform


4/57

4 JDBC ver 1.0

JDBC( Drivers )

JDBC-ODBC Bridge (Type 1)

Native-API partly Java Driver(Type 2)

Net-Protocol All-Java Driver (Type 3) Native Protocol All-Java Driver (Type 4)

Java.sun.com/products/jdbc/jdbcdrivers.html


5/57

5 JDBC ver 1.0

JDBC driver types

JDBC drivers are divided into four types or levels. Each type defines

a JDBC driver implementation with increasingly higher levels of

platform independence, performance, and deployment administration.The four types are:

Type 1:JDBC-ODBC Bridge driver

Type 2:Native-API/partly Java driver

Type 3:Net-protocol/all-Java driver

Type 4:Native-protocol/all-Java driver


6/57

6 JDBC ver 1.0

Type 1: JDBC-ODBC Bridge

The type 1 driver, JDBC-ODBC Bridge, translates all JDBC calls

into ODBC (Open DataBase Connectivity) calls and sends them to the

ODBC driver. As such, the ODBC driver, as well as, in many cases, the

client database code, must be present on the client machine.

JDBC-ODBC Bridge environment.


7/57

7 JDBC ver 1.0

Advantages

The JDBC-ODBC Bridge allows access to almost any database, since

the database's ODBC drivers are already available. Type 1 drivers may be

useful for those companies that have an ODBC driver already installed on

client machines.

DisAdvantages

The performance is degraded since the JDBC call goes through the bridge

to the ODBC driver, then to the native database connectivity interface.The result comes back through the reverse process. Therefore considering

the performance issue, type 1 drivers may not be suitable for large-scale

applications.

The ODBC driver and native connectivity interface must already be

installed on the client machine. Thus any advantage of using Java applets

in an intranet environment is lost, since the deployment problems of

traditional applications.


8/57

8 JDBC ver 1.0

Type 2: Native-API/partly Java driver

JDBC driver type 2 -- the native-API/partly Java driver -- converts

JDBC calls into database-specific calls for databases such as SQL Server,

Informix, Oracle, or Sybase. The type 2 driver communicates directly

with the database server; therefore it requires that some binary code be

present on the client machine.


9/57

9 JDBC ver 1.0

Advantages

Better performance than the JDBC-ODBC Bridge.

DisadvantagesThe vendor database library needs to be loaded on each client machine.

Consequently, type 2 drivers cannot be used for the Internet.

Lower performance than type 3 and type 4 drivers.


10/57

10 JDBC ver 1.0

Type 3: Net-protocol/all-Java driver

JDBC driver type 3 -- the net-protocol/all-Java driver -- follows a

three-tiered approach whereby the JDBC database requests are passed

through the network to the middle-tier server. The middle-tier server then

translates the request (directly or indirectly) to the database-specific

native-connectivity interface to further the request to the database server.

If the middle-tier server is written in Java, it can use a type 1 or type 2

JDBC driver to do this..


11/57

11 JDBC ver 1.0

Advantages

The net-protocol/all-Java driver is server-based, so there is no need

for any vendor database library to be present on client machines. Further,

there are many opportunities to optimize portability, performance, and

scalability. Moreover, the net protocol can be designed to make the clientJDBC driver very small and fast to load. Additionally, a type 3 driver

typically provides support for features such as caching (connections,query

results, and so on), load balancing, and advanced system administration

such as logging and auditing

DisAdvantages

Type 3 drivers require database-specific coding to be done in the middle

tier. Additionally, traversing the recordset may take longer, since the

data comes through the backend server.


12/57

12 JDBC ver 1.0

Type 4: Native-protocol/all-Java driver

The native-protocol/all-Java driver (JDBC driver type 4) converts JDBC

calls into the vendor-specific database management system (DBMS)

protocol so that client applications can communicate directly with the data

base server.Level 4 drivers are completely implemented in Java to achieve platform

independence and eliminate deployment administration issues.

Network


13/57

13 JDBC ver 1.0

Advantages

Since type 4 JDBC drivers don't have to translate database requests

to ODBC or a native connectivity interface or to pass the request on to

another server, performance is typically quite good.

The native -protocol/all-Java driver boasts better performance than types

1 and 2.

Also, there's no need to install special software on the client or server.Further, these drivers can be downloaded dynamically.

Disadvantages

With type 4 drivers, the user needs a different driver for each database.


14/57

14 JDBC ver 1.0

Structured Query Language(SQL)

It is a fourth generation language

It is a database language

It has statements for data definition, query andUpdate (hence it is a DDL and a DML)

Generally every database SQL language would

have one 3rd generation language embedded to

increase its problem solving efficiency


15/57

15 JDBC ver 1.0

JDBC Contd.

Jdbc allows the use of SQL statements to interact

(create, query and update) with the database

SQL and JAVA syntax necessary to use jdbc

effectively


16/57

16 JDBC ver 1.0

Jdbc API (java.sql)

Interfaces :

Driver

Connection

Statement CallableStatement

PrepatedStatement

ResultSet ResultSetMetaData

DataBaseMetaData


17/57

17 JDBC ver 1.0

Jdbc API (Classes)

Date DriverManager

DriverPropertyInfo

Time

TimeStamp

TypesEXCEPTIONS

SQLException SQLWarning

BatchUpdateException


18/57

18 JDBC ver 1.0

Class DriverManager

DriverManager

void registerDriver(Driver)

void deregisterDriver(Driver)

Connection getConnection(String url)Connection getConnection(String url, String

user,String pwd)

Driver getDriver()

Enumeration getDrivers()

void setLogWriter(PrintWriter p)

PrintWriter getLogWriter()

Class Name:

public

static

methods

Drivers are also classes in java. Example:sun.jdbc.odbc.JdbcOdbcDriverthis driver is supplied by Sun itself

Using the commandClass.forName(classname_driver),automatically loads and registers the

driver.


19/57

19 JDBC ver 1.0

Interface Driver

Driver

Connection connect (String,Properties)

boolean acceptsURL(String)

int getMajorVersion()

int getMinorVersion()

boolean jdbcCompliant()

DriverPropertyInfogetPropertyInfo(String,Properties)

interface Name:

public

methods


20/57

20 JDBC ver 1.0

Example

Register a jdbc driver you want to use. Use the

getDrivers() method to retrieve a list of registered

drivers. Obtain the driverInformation by querying

each of the available drivers.

Eg:DriverInfo.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


21/57

21 JDBC ver 1.0

Connecting to a Database

Load the driver by specifying the driver as a string

use the getConnection() method of the

DriverManager class to connect to the database

getConnection method

takes a URL as a parameter

URL (a String) specifies the type of

protocol/subprotocol jdbc will use to connect tothe database)

returns a Connection object
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


22/57

22 JDBC ver 1.0

Usage of Classes

DriverManager

Connection

getConnection(String url)
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


23/57

23 JDBC ver 1.0

Database URL

Goals of this convention

Naming should include connection information

net protocol should have port number/ host nameJDBC:ODBC bridge should use the simple

protocol
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


24/57

24 JDBC ver 1.0

URL Syntax

URLs in the getConnection() method should havethe format :

jdbc::

subprotocol: the database connectivity mechanismsupported by the driver.

subname:specify network address of dbserver(URL for n/w address//Hostname:port/subname)

Example:

jdbc:odbc:javatmp

jdbc:dbnet://HMANT001:1526/ordb

javatmp is an odbcsource name Connect using dbnet protocol to

hmant001 at port 1526 with

ordbc as connection name
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


25/57

25 JDBC ver 1.0

Odbc Subprotocol

This subprotocol used for accessing ODBC data

sources

subprotocol

jdbc:odbc::[; ]

example

jdbc:odbc:javatmpjdbc:odbc:NorthWind;UID=kgh;pwd=foo
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


26/57

26 JDBC ver 1.0

Interface Connection

Connection

Stmt createStatement()Stmt createStatement(int, int)CallableStmt prepareCall(String sql)PreparedStmt prepareStatement(String sql)void rollback()void commit()boolean get/setAutoCommit(boolean)

int get/setTransactionIsolation(int)DatabaseMetaData getMetaData()void close()void clearWarnings()

interface Name

public

methods
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


27/57

27 JDBC ver 1.0

Example

Create a odbc dsn for an access database

Register and load the jdbc-odbc driver.

Connect to the database using getConnection(data

source url );

If there is an exception thrown during the

connection display info and exit

Eg1: CheckConnect.java

Eg2: ConnectType4.java


28/57

28 JDBC ver 1.0

Example

Register and load the jdbc-odbc driver.

Connect to the database using

getConnection(String, Properties); or

getConnection(String,String,String)



Eg: CheckConnect2.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


29/57

29 JDBC ver 1.0

Example

Create new instance of jdbc-odbc driver.

Connect to database using the connect(String,

Properties) method in the driver class



Eg: CheckConnect3.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


30/57

30 JDBC ver 1.0

Interface DatabaseMetaData

DatabaseMetaData

String getDatabaseProductName()

String getDatabaseProductVersion()

int getDriverMajorVersion();

int getDriverMinorVersion();

String getDriverName()

String getDriverVersion()

String getNumericFunctions()String getSystemFunctions()

String getStringFunctions()

interface

Name

public

methods

Method getMetaData() ofConnection interface returnshandle to DatabaseMetaData

More methods are avaialablein this interface.
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


31/57

31 JDBC ver 1.0

Example

Load / Register the jdbc-odbc driver

Connect to database

Use getMetaData() to return a handle toDatabaseMetaData

Display information about the Database

Eg:DatabaseInfo.java


32/57

32 JDBC ver 1.0

Review

DriverManager

Connection

getConnection(String)

DatabaseMetaData

getMetaData()
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


33/57

33 JDBC ver 1.0

Retrieving Data from a DB

To retrieve data one must use one of the following

classes to query the database (after connection has

been established)

Statement

PreparedStatement

CallableStatement

A Statement object is returned from thecreateStatement() method of Connection interface
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


34/57

34 JDBC ver 1.0

Interface Statement

Statement

ResultSet executeQuery(String)

int executeUpdate(String);boolean execute(String)

void close()

ResultSet getResultSet()

void clearWarnings()

interface Name

public

methods

Method createStatement() ofConnection interface returnshandle to Statement

To see the information in rows sentfrom the database, we need to use

methods in the ResultSet interface
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


35/57

35 JDBC ver 1.0

Interface ResultSet

ResultSet

int findColumn(String colname)

boolean getBoolean(int)/(String)

get(int)/(String)void close()

ResultSetMetaData getMetaData()

boolean next()boolean previous()

boolean wasNull()

interface Namepublic

methods

To find out the number of columnsand column types we need to use theResultSetMetaData interface

String argument implies a column nameint argument implies a column position(count is from 1 onwards)
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


36/57

36 JDBC ver 1.0

interface ResultSetMetaData

ResultSetMetaDataint getColumnCount()

int getColumnDisplaySize(int)

String getColumnLabel(int)

String getColumnName(int)int getColumnType(int)

String getColumnTypeName(int)

boolean isReadOnly(int)

boolean isSearchable(int)

boolean isWritable(int)

String getTableName(int)

interface Namepublic

methods
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


37/57

37 JDBC ver 1.0

Example

Load/register the jdbc-odbc driver

Connect to database

get a handle to a statement, and call

executeQuery() in the statement get the count of columns from the MetaDatainformation

display the information rowwise (Note all info is

being displayed as a String)

Eg:SQLQuery.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


38/57

38 JDBC ver 1.0

Review

DriverManager

Connection

getConnection(String)

ResultSetMetaData getMetaData()

Statement

createStatement()

ResultSet

executeQuery(...)
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


39/57

39 JDBC ver 1.0

Example


Connect to database

Get a handle to a statement, and call

executeQuery() in the statement Get the count of columns from the MetaData

information

Display the column information of table

Eg: SQLQueryTableInfo.java


40/57

40 JDBC ver 1.0

StringVARCHARStringCHAR

java.math.BigDecimalNUMERICStringLONGVARCHAR

booleanBITjava.math.BigDecimalDECIMAL

intSMALLINTintTINYINT

longBIGINTintINTEGER

SQL Data Types & Java

Data / Objects

SQL defines its data types. Hencewhile java retrieves these data types,

one must known the type conversionbetween the two.
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


41/57

41 JDBC ver 1.0

doubleFLOAT

floatREAL

byte[ ]BINARY

doubleDOUBLE

byte[ ]VARBINARY

java.sql.TimeTIME

java.sql.DateDATE

java.sql.TimestampTIMESTAMP

SQL Data Types & Java

Data / Objects
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


42/57

42 JDBC ver 1.0

Data Conversion in ResultSets

getXXX(i) will attempt to convert the SQL Data type ofcolumn i into whatever type getXXX() method returns

Example

let the first column in the Result set be an ID number(SQL TYPE: INTEGER)

if we use getString(1), it converts the INTEGER ofSQL into a String object, and it returns a handle to

this objectHence to return an integer, one must use getInt (1)which returns an int


43/57

43 JDBC ver 1.0

SQL NULL

To determine whether the SQL returned

value is null

Step 1: read the value using getXXX().

Setup 2: use the wasNull() method of the Result

set class. If it returns true the value just read was

a SQL Null value

it getXXX() would return zero for SQL nulls forint, byte, long


44/57

44 JDBC ver 1.0

Passing Parameters to SQL

Statements

To retrieve a row based on a value, one

cannot use the following query string

select empid, name from employeeswhere empid=3

the problem with the above statement is that the

empid is having value string 3 and not int 3. Solution: Use PrepareStatement instead of

the Statement class


45/57

45 JDBC ver 1.0

Batch UpdatingBatch Updating

Step 1 : add the executable queries to

statement

- Statement. addBatch(SQL Query);

Step 2 : execute Batch

- int [] Statement.executeBatch();

Step 3 : Process the integer array.

Eg. : BatchUpdate.java


46/57

46 JDBC ver 1.0

Interface PreparedStatement

PreparedStatement

ResultSet executeQuery()

int executeUpdate();

boolean execute();

ResultSet getResultSet()

void clearParameters()

void setXXX(int,XXX)

interface Name

public

methods

The string to be queried must be passedto prepareStatement of Connection

class as a parameter.

setxxx() methods in this interface do not doconversions, but insert the correspondingjava to SQL mapped data types
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


47/57

47JDBC ver 1.0

Setting Parameters in Query

To create a queryselect empid, empname, empdesc from

employees where empid=3

PreparedStatement ps =conn.prepareStatement(select empid,empname, empdesc form employeeswhere empid=?);

ps.setInt(1,3);

ps.executeQuery();

In parameters in the query string are filledwith ? marks.

Use setXXX(1, val) to set the firstparameter with val of type XXX

Use setXXX(2, ) to insert at the second

question mark
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


48/57

48JDBC ver 1.0

Example


Connect to database

Display information about the person withemployeeID = 3 from employees table inNorthwind database.

Eg:SQLQuery2.java


49/57

49JDBC ver 1.0

Exercise

Create a table Projects with the followingspecifications

ProjectID - integer

ProjectName - text

ProjectLocation - text

ProjectStartDate - Date

insert the values

(1, ecom, hma, 1985-03-9)(2, corba, hst, 1945-06-26)

(3, hxml, lst, 1996-09-5)

SQLExercise.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


50/57

50JDBC ver 1.0

To send an SQL null as parameter use the

setNull(int,int) in the PreparedStatement interface

first integer is the position of the parameter

second integer is the constant for SQLtype ofparameter

constants defined in java.sql.Types.xxx

java.sql.Types.VARCHARjava.sql.Types.BIT

Sending SQL Nulls as Parameters


51/57

51JDBC ver 1.0

Exercise

Insert the value into the table Projects created in theprevious exercise .

(4, Cold Fusion, , 1999-09-9)

SQLExercise2.java
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


52/57

52JDBC ver 1.0

Stored Procedures

To execute a stored procedure call, one must use theCallableStatement interface

This can be created using the prepareCall(String) method

of the Connection interface A stored procedure call might return some values

to retrieve them, you need to register the out parametertypes before executing the stored procedure query

CallableStatement extends from PreparedStatementinterface


53/57

53JDBC ver 1.0

Illustration

CallableStatementstmt = conn.prepareCall({call

getTestData(?,?) });

// getTestData has 2 OUT parameters

stmt.registerOutParameter(1,Types.TINYINT);

stmt.registerOutParameter(2,Types.DOUBLE);

int i = stmt.executeUpdate();

byte x = stmt.getByte(1);double d = stmt.getDouble(2);


54/57

54JDBC ver 1.0

DriverManager

Connection

getConnection Statement

PreparedStatement

createStatement

prepareStatement

prepareCall

CallableStatement

subclass

Data types: Date

int, Time, longdouble, float

ResultSet

executeQuery

getXXX

getXXX

setXXX

executeUpdate;getResultSet

C i S d P d
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


55/57

55JDBC ver 1.0

Creating a Stored Procedure

String createProcedure = "create procedure

SHOWEMP " + "as "

+ "select * FROM emp;

Statement stmt = conn.createStatement();

stmt.executeUpdate(createProcedure);

Steps to create a stored procedure in the database
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


56/57

56JDBC ver 1.0

Calling the Stored Procedure

CallableStatement stmt = conn.prepareCall(

{ call SHOWEMP });

ResultSet rs = stmt.executeQuery();

Steps to execute a stored procedure in the database
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java


57/57

JDBC 1 0

Exercise (contd)Exercise (contd)

19. The application, as of now, is having

difficulty in managing the data stored in the

files. Further, accessing, this data according to

various permutations and combinations hasbeen a tedious task. Therefore, it is suggested

that the data in the files be migrated to a

RDBMS
http://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.javahttp://var/www/apps/conversion/current/tmp/scratch12626/show.bat%20BasicDataTypes.java

jdbc by kamalakar dandu

Documents