If there are constraints on the trigger table, check these constraints AFTER the INSTEADOF trigger is executed but before the AFTER trigger is executed. If the constraints are damaged, roll back the INSTEADOF trigger operation without executing the
CREATE TRIGGER trigger_name ON { table | view } [ WITH ENCRYPTION ] {{ { FOR | AFTER | INSTEAD OF } { [ INSERT ] [ , ] [ UPDATE ] }[ WITH APPEND ][ NOT FOR REPLICATION ]AS[ { IF UPDATE ( column )[ { AND | OR } UPDATE ( column ) ][ ...n ]| IF (
Database trigger details bitsCN. com1 introduction
Like the stored procedure, Mysql triggers are embedded into a mysql program. The trigger is a new function of mysql5. Currently, the online Fengchao system, Beidou system, and Columbus system use
1 Introduction Like the stored procedure, Mysql triggers are embedded into a mysql program. The trigger is a new function of mysql5. Currently, the online fengchao system, Beidou system, and Columbus system use the database of mysql5.0.45. Many
Development and Design of Oracle triggers
1. What is a trigger?A database trigger is a stored PL/SQL block, which is associated with a base table. When a specific database maintenance (insert, delete, update) is performed on the table, implicitly
Triggers using tutorials and naming conventionsDirectoryTriggers using tutorials and naming conventions 11, Trigger Introduction 12, trigger Example 23, trigger syntax and features 34, example one: row level trigger 145, example two: row level
Triggers using tutorials and naming conventionsDirectoryTriggers using tutorials and naming conventions 11, Trigger Introduction 12, trigger Example 23, trigger syntax and features 34, example one: row level trigger 145, example two: row level
Triggers can do a lot of things, but it also brings a lot of problems. The right use is to use it at the right time and not to use it when it is inappropriate.Some common uses for triggers are as follows:[1] Elastic referential integrity: implements
The main contents of this article are as follows:1. Trigger type1.1 DML triggers1.2 Alternative triggers1.3 System triggers2. Trigger composition3. Create a Trigger3.1 Trigger Trigger Order3.2 Creating a DML Trigger3.3 Creating an alternative
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