This record is the result of a trigger, which we have created on INSERT operation in COMPANY table. Same time, one record will be created in AUDIT table. This will create one record in COMPANY table, which is as follows − Sqlite> INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) Create one record in COMPANY table as follows − Now, we will start actual work, Let's start inserting record in COMPANY table which should result in creating an audit log record in AUDIT table. INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, datetime('now')) Sqlite> CREATE TRIGGER audit_log AFTER INSERT Now let's create a trigger on COMPANY table as follows − Here, ID is the AUDIT record ID, and EMP_ID is the ID which will come from COMPANY table and DATE will keep timestamp when the record will be created in COMPANY table. To keep audit trial, we will create a new table called AUDIT where the log messages will be inserted, whenever there is an entry in COMPANY table for a new record.
DB BROWSER FOR SQLITE TRIGGER TRIAL
Let us consider a case where we want to keep audit trial for every record being inserted in COMPANY table, which we create newly as follows (Drop COMPANY table if you already have it).
DB BROWSER FOR SQLITE TRIGGER UPDATE
You can optionally specify FOR EACH ROW after table name.įollowing is the syntax for creating a trigger on an UPDATE operation on one or more specified columns of a table.ĬREATE TRIGGER trigger_name UPDATE OF column_name Here, event_name could be INSERT, DELETE, and UPDATE database operation on the mentioned table table_name. The table to be modified must exist in the same database as the table or view to which the trigger is attached and one must use just tablename not database.tablename.Ī special SQL function RAISE() may be used within a trigger-program to raise an exception.įollowing is the basic syntax of creating a trigger.ĬREATE TRIGGER trigger_name event_name Triggers are automatically dropped when the table that they are associated with is dropped. The BEFORE or AFTER keyword determines when the trigger actions will be executed relative to the insertion, modification, or removal of the associated row. If no WHEN clause is supplied, the SQL statements are executed for all rows. If a WHEN clause is supplied, the SQL statements specified are only executed for rows for which the WHEN clause is true.
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Hence, explicitly specifying FOR EACH ROW is optional.īoth the WHEN clause and the trigger actions may access elements of the row being inserted, deleted, or updated using references of the form NEW.column-name and OLD.column-name, where column-name is the name of a column from the table that the trigger is associated with. SQLite trigger may be specified to fire whenever a DELETE, INSERT or UPDATE of a particular database table occurs or whenever an UPDATE occurs on one or more specified columns of a table.Īt this time, SQLite supports only FOR EACH ROW triggers, not FOR EACH STATEMENT triggers. Following are the important points about SQLite triggers − SQLite Triggers are database callback functions, which are automatically performed/invoked when a specified database event occurs.