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sql/sql_insert.cc: CREATE ... IF NOT EXISTS may do nothing, but it is still not a failure. don't forget to my_ok it. ****** CREATE ... IF NOT EXISTS may do nothing, but it is still not a failure. don't forget to my_ok it. sql/sql_table.cc: small cleanup ****** small cleanup
63 lines
2 KiB
Text
63 lines
2 KiB
Text
--echo #
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--echo # TRUNCATE TABLE
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--echo #
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--echo # Truncating is disallowed for parent tables unless such table
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--echo # participates in self-referencing foreign keys only.
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--echo #
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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--error ER_TRUNCATE_ILLEGAL_FK
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TRUNCATE TABLE t1;
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--echo # Truncation of child should succeed.
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TRUNCATE TABLE t2;
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DROP TABLE t2;
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DROP TABLE t1;
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CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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--echo # Truncation of self-referencing table should succeed.
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TRUNCATE TABLE t1;
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DROP TABLE t1;
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--echo #
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--echo # Also, truncating such tables is allowed if foreign key
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--echo # checks are disabled.
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--echo #
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SET @old_foreign_key_checks = @@SESSION.foreign_key_checks;
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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SET @@SESSION.foreign_key_checks = 1;
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--error ER_TRUNCATE_ILLEGAL_FK
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TRUNCATE TABLE t1;
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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LOCK TABLES t1 WRITE;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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SET @@SESSION.foreign_key_checks = 1;
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--error ER_TRUNCATE_ILLEGAL_FK
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TRUNCATE TABLE t1;
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UNLOCK TABLES;
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DROP TABLE t3,t2,t1;
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SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
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--echo #
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--echo # Test that TRUNCATE resets auto-increment.
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--echo #
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CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT);
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INSERT INTO t1 VALUES (NULL), (NULL);
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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SELECT * FROM t1 ORDER BY a;
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TRUNCATE TABLE t1;
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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INSERT INTO t1 VALUES (NULL), (NULL);
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SELECT * FROM t1 ORDER BY a;
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DROP TABLE t1;
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