Tutorial Chapter 6: Append, Update, Delete

Parent topic: Tutorial Chapter 6: Append, Update, Delete

Appending/Updating a row

The INPUT statement provides control blocks to allow your program to initialize field contents and validate user input when adding or updating a row.

INPUT Statement Control blocks
Control blocks such as BEFORE FIELD, ON CHANGE and AFTER FIELD code blocks are called automatically during an INPUT as the user moves the cursor through the fields of a form and modifies field values.
Example: custdata.4gl (Function appupd_cust)
The function appupd_cust, of the custdata.4gl module, allowing the user to insert values for a new customer row or to update an existing row.

Parent topic: Tutorial Chapter 6: Append, Update, Delete