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36 lines
1.5 KiB
Text
36 lines
1.5 KiB
Text
CREATE DATABASE db1;
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USE db1;
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CREATE TABLE t1 (val INT);
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CREATE TRIGGER IF NOT EXISTS val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + NEW.val;
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SET @sum=0;
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INSERT INTO t1 VALUES (10), (20), (30);
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SELECT @sum;
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@sum
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60
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CREATE TRIGGER IF NOT EXISTS val_sum_new BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + NEW.val;
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CREATE TRIGGER IF NOT EXISTS val_sum AFTER INSERT ON t1 FOR EACH ROW SET @sum = @sum + 1 + NEW.val;
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Warnings:
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Note 1359 Trigger 'db1.val_sum' already exists
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CREATE OR REPLACE TRIGGER IF NOT EXISTS val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 2 + NEW.val;
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ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS
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SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum';
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ACTION_STATEMENT
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SET @sum = @sum + NEW.val
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CREATE OR REPLACE TRIGGER val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 3 + NEW.val;
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SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum';
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ACTION_STATEMENT
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SET @sum = @sum + 3 + NEW.val
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CREATE TRIGGER val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 4 + NEW.val;
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ERROR HY000: Trigger 'db1.val_sum' already exists
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SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum';
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ACTION_STATEMENT
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SET @sum = @sum + 3 + NEW.val
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# Clearing up
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DROP TRIGGER IF EXISTS val_sum;
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SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum';
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ACTION_STATEMENT
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DROP TRIGGER IF EXISTS val_sum;
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Warnings:
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Note 1360 Trigger does not exist
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DROP TABLE t1;
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DROP DATABASE db1;
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