Windows Database Applications

CIS 341 Chapter 4

Objectives

Related tablesFormat Data GridParent retrievalChild retrievalBound and unbound controls

Data Relationships

One-to-many (1:M)One-to-one (1:1) Many-to-many (M:N)

Many-to-many (M:N)

student coursestu1 John class1 Math stu2 Mary class2 English

student stu_course courseStu1 Mary stu1 class1 class1 MathStu2 John stu1 class2 class2

Englishstu2 class1stu2 class2

Grid Related Tables

Dataset creationRelationship

Data Grid Format

Data Grid

Data Table Styles Collection

Data Grid Table Style

Data Grid Column Style

Grid Column Styles Collection

Parent / Child records

Dataset for both tablesRelationshipDataset for combo box

Unbound

Parent / Child recordsRetrieve a selected parent rowRetrieve an array of matching child rowsReference fields in the selected rows

Data Grid Format

Data Table

Data Rows Collection

Data Row (0)

Data Row (1)

Retrieve Parent Row