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31 lines
656 B
Text
31 lines
656 B
Text
CREATE TABLE parent (
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id INT,
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KEY (id)
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) ENGINE=InnoDB;
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CREATE TABLE child (
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id INT,
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parent_id INT,
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FOREIGN KEY (parent_id)
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REFERENCES parent(id)
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ON UPDATE CASCADE
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ON DELETE CASCADE
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) ENGINE=InnoDB;
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INSERT INTO parent VALUES (1), (1), (2), (2);
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INSERT INTO child VALUES (1,1), (2,2), (1,1), (2,2);
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connection node_2;
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DELETE FROM parent WHERE id = 1;
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SELECT COUNT(*) = 0 FROM child WHERE id = 1;
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COUNT(*) = 0
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1
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connection node_1;
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UPDATE parent SET id = 3 WHERE id = 2;
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connection node_2;
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SELECT COUNT(*) = 0 FROM child WHERE parent_id = 1;
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COUNT(*) = 0
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1
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SELECT parent_id = 3 FROM child WHERE id = 2;
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parent_id = 3
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1
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1
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DROP TABLE child;
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DROP TABLE parent;
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