php and sql server: queries ist2101. three-tier architecture three-tier architecture means that the...

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PHP and SQL Server: Queries

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Three-Tier Architecture

• Three-tier architecture means that the Web server and the DBMS are on separate servers

Client (PC) Web Server DBMS

PHP is run on the web server

Browser Microsoft SQL Management Studio

Our technical setting

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What we have learned

• PHP and SQL connection in last class– http://my.up.ist.psu.edu/zuz22/query.php

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Today’s Objectives

• Answer different queries from PHP• Cases:– http://my.up.ist.psu.edu/zuz22/case1.php

• Review exercise

– http://my.up.ist.psu.edu/zuz22/case2.php– http://my.up.ist.psu.edu/zuz22/case2a.php– http://my.up.ist.psu.edu/zuz22/case3.php– http://my.up.ist.psu.edu/zuz22/case3a.php

• Lab exercise

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Prepare Database

• We will use the database in Chapter 3

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Prepare Database• Log into your SQL Server application and check whether you

already have these 4 tables• If not, do the following…

– Delete any tables (assignment, project, employee, and department) you have in your database• Right click table, click “delete”• Because of the referential integrity constraints, you need to follow certain

order to delete the tables: assignment project employee department

– Create new database• Download SQL-Create-Tables.sql from SQL (Ch. 3) class on course website and

run it

– Insert data• Download SQL-Insert-Data.sql from SQL (Ch. 3) class on course website and run

it

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Prepare Database (cont.)

• You should now have the 4 tables in your database– If not, right click Tables, and

click “refresh”• Check whether you already

have the data in your tables– Right click on a table and click

“Select Top 1000 Rows”

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Case 1. Browse a Table (Review)

• http://my.up.ist.psu.edu/zuz22/case1.php

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Case 1. Get it run on your webspace (Step 1)

• Download week11-3-cases.zip from wikipage.

• Unzip it, you will have 8 PHP files. Copy all the files to your webspace.

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Case 1. Get it run on your webspace (Step 2)

• Open process_case1.php from NotePad++ and modify the information

Input your own information

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Case 1. Debugging

Visit your php page and query your database– http://my.up.ist.psu.edu/YourPSUID/case1.php

What problems do you see? How to fix them?

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Case 2. Browse a Table with Constraint

• http://my.up.ist.psu.edu/zuz22/case2.php

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Case 2. Get it run on your webspace

• Follow the steps as Case 1• Open process_case2.php and add your database

information to the file• Visit your PHP page from Internet:

• http://my.up.ist.psu.edu/YourPSUID/case2.php

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Case 2. Code Specificationcase2.php

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Case 2. Code Specification (cont.)case2.php

process_case2.php

Any Problem with Case 2?

• Is there anything we can improve in terms of its utility and appearance?

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Case 2a. Browse a Table with Constraint – Values from Database

• http://my.up.ist.psu.edu/zuz22/case2a.php

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Case 2a. Get it run on your webspace

• Follow the steps as Case 1• Open case2a.php and process_case2a.php and add your

database information to both files• Visit your PHP page from Internet:

• http://my.up.ist.psu.edu/YourPSUID/case2a.php

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Case 2a. Code Specificationcase2a.php

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Case 2a. Code Specificationprocess_case2a.php

Same as process_case2.php except “Go back” action

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Compare Case 2 and Case 2a

Case 2: manually code all the submit buttons

Case 2a: dynamically generate all the submit buttons

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Case 3. Browse a Table with Constraint (Dropdown List)

• http://my.up.ist.psu.edu/zuz22/case3.php

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Case 3. Get it run on your webspace

• Follow the steps as Case 1• Open process_case3.php and add your database

information to the file• Visit your PHP page from Internet:

• http://my.up.ist.psu.edu/YourPSUID/case3.php

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Case 3. Code Specificationcase3.php

Compare with case2.php

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Case 3. Code Specificationprocess_case3.php

Same as process_case2.php except “Go back” action

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Case 3a. Lab Exercise

• Now we want to merge the improvements we made in Case 2a (values retrieved from database) and Case 3 (using dropdown list) to create a better webpage.

• http://my.up.ist.psu.edu/zuz22/case3a.php

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Case 3a. Lab Exercise Hint 1

• Create case3a.php in your webspace, copy from case2a.php and modify it

Action to which PHP page?

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Case 3a. Lab Exercise Hint 2

• Modify your case3a.php

How to modify this segment to echo something like a dropdown list?

Case2a.php will generate this

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Case 3a. Lab Exercise Hint 3

• Create process_case3a.php, copy from process_case2a.php and modify it

This is the only place you need to modify