107 lines
4.0 KiB
Plaintext
107 lines
4.0 KiB
Plaintext
#
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# TRUNCATE TABLE
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#
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# Truncating is disallowed for parent tables unless such table
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# participates in self-referencing foreign keys only.
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#
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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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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1`)
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# 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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# 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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#
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# Also, truncating such tables is allowed if foreign key
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# checks are disabled.
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#
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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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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1`)
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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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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1`)
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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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#
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# Test that TRUNCATE resets auto-increment.
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#
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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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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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3
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SELECT * FROM t1 ORDER BY a;
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a
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1
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2
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TRUNCATE TABLE t1;
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ANALYZE TABLE t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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1
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INSERT INTO t1 VALUES (NULL), (NULL);
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SELECT * FROM t1 ORDER BY a;
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a
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1
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2
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DROP TABLE t1;
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#
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# Test that TRUNCATE with innodb_default_row_format changed
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#
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CREATE TEMPORARY TABLE t1(c1 DOUBLE(1,0)ZEROFILL,c2 BLOB,c3 YEAR)
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ENGINE=InnoDB;
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Warnings:
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Warning 1681 The ZEROFILL attribute is deprecated and will be removed in a future release. Use the LPAD function to zero-pad numbers, or store the formatted numbers in a CHAR column.
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Warning 1681 Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
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ALTER TABLE t1 MODIFY c2 VARCHAR(1024)BINARY CHARACTER SET 'Binary' COLLATE
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'Binary';
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Warnings:
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Warning 1287 'BINARY as attribute of a type' is deprecated and will be removed in a future release. Please use a CHARACTER SET clause with _bin collation instead
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ALTER TABLE t1 ADD INDEX(c2),ADD UNIQUE (c2);
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SET @@GLOBAL.innodb_default_row_format=1;
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TRUNCATE t1;
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DROP TABLE t1;
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SET @@GLOBAL.innodb_default_row_format=default;
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CREATE TABLE t1(c1 DOUBLE(1,0)ZEROFILL,c2 BLOB,c3 YEAR)
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ENGINE=InnoDB;
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Warnings:
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Warning 1681 The ZEROFILL attribute is deprecated and will be removed in a future release. Use the LPAD function to zero-pad numbers, or store the formatted numbers in a CHAR column.
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Warning 1681 Specifying number of digits for floating point data types is deprecated and will be removed in a future release.
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ALTER TABLE t1 MODIFY c2 VARCHAR(1024)BINARY CHARACTER SET 'Binary' COLLATE
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'Binary';
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Warnings:
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Warning 1287 'BINARY as attribute of a type' is deprecated and will be removed in a future release. Please use a CHARACTER SET clause with _bin collation instead
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ALTER TABLE t1 ADD INDEX(c2),ADD UNIQUE (c2);
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alter table t1 partition by key (c2) partitions 2;
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SET @@GLOBAL.innodb_default_row_format=1;
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TRUNCATE t1;
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DROP TABLE t1;
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SET @@GLOBAL.innodb_default_row_format=default;
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