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Force InnoDB to recheck foreign keys
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-- https://stackoverflow.com/questions/2250775/force-innodb-to-recheck-foreign-keys-on-a-table-tables | |
DELIMITER $$ | |
DROP PROCEDURE IF EXISTS ANALYZE_INVALID_FOREIGN_KEYS$$ | |
CREATE | |
PROCEDURE `ANALYZE_INVALID_FOREIGN_KEYS`( | |
checked_database_name VARCHAR(64), | |
checked_table_name VARCHAR(64), | |
temporary_result_table ENUM('Y', 'N')) | |
LANGUAGE SQL | |
NOT DETERMINISTIC | |
READS SQL DATA | |
BEGIN | |
DECLARE TABLE_SCHEMA_VAR VARCHAR(64); | |
DECLARE TABLE_NAME_VAR VARCHAR(64); | |
DECLARE COLUMN_NAME_VAR VARCHAR(64); | |
DECLARE CONSTRAINT_NAME_VAR VARCHAR(64); | |
DECLARE REFERENCED_TABLE_SCHEMA_VAR VARCHAR(64); | |
DECLARE REFERENCED_TABLE_NAME_VAR VARCHAR(64); | |
DECLARE REFERENCED_COLUMN_NAME_VAR VARCHAR(64); | |
DECLARE KEYS_SQL_VAR VARCHAR(1024); | |
DECLARE done INT DEFAULT 0; | |
DECLARE foreign_key_cursor CURSOR FOR | |
SELECT | |
`TABLE_SCHEMA`, | |
`TABLE_NAME`, | |
`COLUMN_NAME`, | |
`CONSTRAINT_NAME`, | |
`REFERENCED_TABLE_SCHEMA`, | |
`REFERENCED_TABLE_NAME`, | |
`REFERENCED_COLUMN_NAME` | |
FROM | |
information_schema.KEY_COLUMN_USAGE | |
WHERE | |
`CONSTRAINT_SCHEMA` LIKE checked_database_name AND | |
`TABLE_NAME` LIKE checked_table_name AND | |
`REFERENCED_TABLE_SCHEMA` IS NOT NULL; | |
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; | |
IF temporary_result_table = 'N' THEN | |
DROP TEMPORARY TABLE IF EXISTS INVALID_FOREIGN_KEYS; | |
DROP TABLE IF EXISTS INVALID_FOREIGN_KEYS; | |
CREATE TABLE INVALID_FOREIGN_KEYS( | |
`TABLE_SCHEMA` VARCHAR(64), | |
`TABLE_NAME` VARCHAR(64), | |
`COLUMN_NAME` VARCHAR(64), | |
`CONSTRAINT_NAME` VARCHAR(64), | |
`REFERENCED_TABLE_SCHEMA` VARCHAR(64), | |
`REFERENCED_TABLE_NAME` VARCHAR(64), | |
`REFERENCED_COLUMN_NAME` VARCHAR(64), | |
`INVALID_KEY_COUNT` INT, | |
`INVALID_KEY_SQL` VARCHAR(1024) | |
); | |
ELSEIF temporary_result_table = 'Y' THEN | |
DROP TEMPORARY TABLE IF EXISTS INVALID_FOREIGN_KEYS; | |
DROP TABLE IF EXISTS INVALID_FOREIGN_KEYS; | |
CREATE TEMPORARY TABLE INVALID_FOREIGN_KEYS( | |
`TABLE_SCHEMA` VARCHAR(64), | |
`TABLE_NAME` VARCHAR(64), | |
`COLUMN_NAME` VARCHAR(64), | |
`CONSTRAINT_NAME` VARCHAR(64), | |
`REFERENCED_TABLE_SCHEMA` VARCHAR(64), | |
`REFERENCED_TABLE_NAME` VARCHAR(64), | |
`REFERENCED_COLUMN_NAME` VARCHAR(64), | |
`INVALID_KEY_COUNT` INT, | |
`INVALID_KEY_SQL` VARCHAR(1024) | |
); | |
END IF; | |
OPEN foreign_key_cursor; | |
foreign_key_cursor_loop: LOOP | |
FETCH foreign_key_cursor INTO | |
TABLE_SCHEMA_VAR, | |
TABLE_NAME_VAR, | |
COLUMN_NAME_VAR, | |
CONSTRAINT_NAME_VAR, | |
REFERENCED_TABLE_SCHEMA_VAR, | |
REFERENCED_TABLE_NAME_VAR, | |
REFERENCED_COLUMN_NAME_VAR; | |
IF done THEN | |
LEAVE foreign_key_cursor_loop; | |
END IF; | |
SET @from_part = CONCAT('FROM ', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', ' AS REFERRING ', | |
'LEFT JOIN `', REFERENCED_TABLE_SCHEMA_VAR, '`.`', REFERENCED_TABLE_NAME_VAR, '`', ' AS REFERRED ', | |
'ON (REFERRING', '.`', COLUMN_NAME_VAR, '`', ' = ', 'REFERRED', '.`', REFERENCED_COLUMN_NAME_VAR, '`', ') ', | |
'WHERE REFERRING', '.`', COLUMN_NAME_VAR, '`', ' IS NOT NULL ', | |
'AND REFERRED', '.`', REFERENCED_COLUMN_NAME_VAR, '`', ' IS NULL'); | |
SET @full_query = CONCAT('SELECT COUNT(*) ', @from_part, ' INTO @invalid_key_count;'); | |
PREPARE stmt FROM @full_query; | |
EXECUTE stmt; | |
IF @invalid_key_count > 0 THEN | |
INSERT INTO | |
INVALID_FOREIGN_KEYS | |
SET | |
`TABLE_SCHEMA` = TABLE_SCHEMA_VAR, | |
`TABLE_NAME` = TABLE_NAME_VAR, | |
`COLUMN_NAME` = COLUMN_NAME_VAR, | |
`CONSTRAINT_NAME` = CONSTRAINT_NAME_VAR, | |
`REFERENCED_TABLE_SCHEMA` = REFERENCED_TABLE_SCHEMA_VAR, | |
`REFERENCED_TABLE_NAME` = REFERENCED_TABLE_NAME_VAR, | |
`REFERENCED_COLUMN_NAME` = REFERENCED_COLUMN_NAME_VAR, | |
`INVALID_KEY_COUNT` = @invalid_key_count, | |
`INVALID_KEY_SQL` = CONCAT('SELECT ', | |
'REFERRING.', '`', COLUMN_NAME_VAR, '` ', 'AS "Invalid: ', COLUMN_NAME_VAR, '", ', | |
'REFERRING.* ', | |
@from_part, ';'); | |
END IF; | |
DEALLOCATE PREPARE stmt; | |
END LOOP foreign_key_cursor_loop; | |
END$$ | |
DELIMITER ; | |
CALL ANALYZE_INVALID_FOREIGN_KEYS('%', '%', 'Y'); | |
DROP PROCEDURE IF EXISTS ANALYZE_INVALID_FOREIGN_KEYS; | |
SELECT * FROM INVALID_FOREIGN_KEYS; |
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