database-canvas with multiple datablocks(database)
- 3. Agenda • Validation Triggers • Multiple Datablocks in one canvas (VERY IMPORTANT!) • Write a trigger to retrieve multiple records from the database • Write a trigger to insert multiple records from the database
- 4. VERY IMPORTANT! • Check the objects you just created belong to the dummy datablock (drag the object back to the right place) • Move the datablocks so that the datablock of the LOGIN page goes first
- 5. Why do we need validation triggers? There are some instances entered by users that are not valid!!!! 5
- 6. Validation Triggers in Forms Developer • Validation triggers ensure users insert correct values in the system • Example: – Student_ID should be in 8‐characters – Year should not exceed 5 and should not less than 0 6
- 8. Multiple Datablocks in One Canvas • An user interface involving data from more than one tables • For example: – Search engine • Search keyword (Manual datablock) • Results (Datablock that is created base on a table)
- 10. Illustration 1: Create a canvas with multiple datablocks (2) • Basic Steps – Create a blank canvas – Create a manual datablock for capturing search keyword
- 11. Illustration 1: Create a canvas with multiple datablocks (3) • Basic Steps – Create a datablock from COURSE table using Datablock Wizard – Put the datablock on the existing canvas using Layout Wizard
- 12. Forms Styles (1) • Datablock can be presented in 2 different styles • 2 Form Styles – Form Style • For showing one instance – Tabular Style • For showing multiple instances
- 14. Code Review (I) • Search Engine – Search engine code – Retrieve multiple records using FOR Loop • View Detail – Push button under Tabular style Reference for: Search records, View order records, View shopping cart, Logout (CLEAR_BLOCK command)
- 16. Project Work 1. Search Engine – A trigger that retrieves multiple records from Product table, given a particular search keyword 2. View product detail – A trigger that retrieves product detail from Product table to the next page, given a Product ID 3. Add to shopping cart – A trigger that inserts Mem ID, Pro ID, Quantity into Shopping Cart Line table 4. Retrieve shopping cart – A trigger that retrieves multiple records from Shopping Cart Line table, given a particular Mem_ID