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17 Δεκ 2009 · I need to be able to do multiple insert/updates within a trigger. Every attempt ends with failure : (. DROP TRIGGER IF EXISTS `Insert_Article`//. CREATE TRIGGER `Insert_Article` AFTER INSERT ON `Article`.
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement”. Here is a simple example that associates a trigger with a table, to activate for INSERT operations.
MySQL supports triggers that are invoked in response to the INSERT, UPDATE or DELETE event. The SQL standard defines two types of triggers: row-level triggers and statement-level triggers. A row-level trigger is activated for each row that is inserted, updated, or deleted.
A trigger is defined to activate when a statement inserts, updates, or deletes rows in the associated table. These row operations are trigger events. For example, rows can be inserted by INSERT or LOAD DATA statements, and an insert trigger activates for each inserted row.
If I put an insert/update/delete trigger on both tables, I will end up in a recursion loop. This is because the tables need to be synchronised, so the insert / update / delete triggers need to be on both tables. Requirements. Must be 100% MySQL. Cannot use a programming language for this.
trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | PRECEDES } other_trigger_name. This statement creates a new trigger. A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table.
16 Νοε 2021 · A MySQL trigger can store SQL statements to execute when there’s an INSERT, UPDATE, or DELETE statement executed on a specific table. The syntax to create a trigger looks as follows: CREATE TRIGGER trigger_name {BEFORE | AFTER} {INSERT | UPDATE | DELETE} ON table_name FOR EACH ROW BEGIN --what to do here. END;
