Enable Database Triggers for a file

Visual LANSA

Enable Database Triggers for a file

This makes the LANSA repository rules available to all I/O done against a file, whether made via LANSA or via non-LANSA means. For example, when a file is updated with an RPG or COBOL application, the validation rules within the repository will be enforced, and any LANSA Trigger functions will be executed. In addition, whenever a database trigger is triggered for a file, a trigger environment user exit program, DCTRGENVUE, must be in the job's library list so that the correct LANSA environment can be established.  Database Triggers can only be enabled for a file in an RDMLX partition.

What happens when I enable Database Triggers for a file?

When a file is enabled for Database Triggers, a Database Trigger program name is needed. This is initially defaulted to DB <filename>, (as described in Database File Trigger in the Technical Reference Guide) but can be overridden if this causes duplicate names with another OAM or Database Trigger program name. When the file is next made operational, a Database Trigger program is generated and compiled to run in a named activation group, any Database Trigger processing is added to the OAM, and any triggers added to the database, according to the validation rules and triggers defined for the file. 

Validation rules

and/or trigger functions

result in DB Trigger

Insert

Before Insert

Before Insert

N/A

After Insert

After Insert

Update

Before Update

Before Update

N/A

After Update

After Update

Delete

Before Delete

Before Delete

N/A

After Delete

After Delete

N/A

Before Read

*

N/A

After Read

After Read

N/A

Before Open

*

N/A

After Open

*

N/A

Before Close

*

N/A

After Close

*

 

 

Note: * means not implemented in the database

The Database Trigger program and database triggers are created in the I/O module library. The triggers are named:

LANSA_<program library>_<partition>_<library>_<file>_<trigger time>_<trigger event>

where:

<program library>is the LANSA program library, for example DCXPGMLIB

<partition> is the LANSA partition, for example PRD

<library> is the file library, for example DCXPRDLIB

<file> is the file name, for example PSLMST

<trigger time> is the trigger time, for example BEFORE

<trigger event> is the trigger event, for example INSERT

An example of an  entire trigger name could be LANSA_DCXPGMLIB_PRD_DCXPRDLIB_PSLMST_BEFORE_INSERT.

Ý 4.5.11 LANSA Database Triggers