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30 lines
699 B
Text
30 lines
699 B
Text
connection node_2;
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connection node_1;
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CREATE TABLE parent (
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id1 INT,
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id2 INT,
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PRIMARY KEY (id1, id2) /* Multipart PK */
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) ENGINE=InnoDB;
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CREATE TABLE child (
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id INT PRIMARY KEY,
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parent_id1 INT,
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FOREIGN KEY (parent_id1)
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REFERENCES parent(id1) /* FK is subset of PK above */
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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, 2);
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INSERT INTO child VALUES (1, 1);
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connection node_2;
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UPDATE parent SET id1 = 3 WHERE id1 = 1;
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connection node_1;
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SELECT COUNT(*) = 1 FROM child WHERE parent_id1 = 3;
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COUNT(*) = 1
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1
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DELETE FROM parent WHERE id1 = 3;
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connection node_2;
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SELECT COUNT(*) = 0 FROM child WHERE parent_id1 = 3;
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COUNT(*) = 0
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1
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DROP TABLE child;
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DROP TABLE parent;
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