Force InnoDB to recheck foreign keys on a table/tables?
我有一组
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之前,然后:
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后。
加载完成后,我想检查更新表中的数据是否仍然保持参照完整性 - 新行不会破坏外键约束 - 但似乎没有办法做到这一点。
作为测试,我输入的数据确实违反了外键约束,并且在重新启用外键检查时,mysql没有产生任何警告或错误。
如果我试图找到一种方法来指定表加载顺序,并在加载过程中保留外键检查,这将不允许我在具有自引用外键约束的表中加载数据,所以这样做不是一个可接受的解决方案
有没有办法强制InnoDB验证表或数据库的外键约束?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | 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$$ DELIMITER ; CALL ANALYZE_INVALID_FOREIGN_KEYS('%', '%', 'Y'); DROP PROCEDURE IF EXISTS ANALYZE_INVALID_FOREIGN_KEYS; SELECT * FROM INVALID_FOREIGN_KEYS; |
您可以使用此存储过程检查所有数据库中是否有无效的外键。
结果将加载到
参数
结果是否是暂时的。它可以是:
-
在
'Y' 的情况下,ANALYZE_INVALID_FOREIGN_KEYS 结果表将是临时表。
其他会话不会显示临时表。
您可以与临时结果表并行执行多个ANALYZE_INVALID_FOREIGN_KEYS(...) 存储过程。 -
但是,如果您对其他会话的部分结果感兴趣,则必须使用
'N' ,然后从其他会话执行SELECT * FROM INVALID_FOREIGN_KEYS; 。 -
您必须使用
NULL 跳过事务中的结果表创建,因为MySQL在CREATE TABLE ... 和DROP TABLE ... 的事务中执行隐式提交,因此创建结果表会导致事务中出现问题。在这种情况下,您必须自己从BEGIN; COMMIT/ROLLBACK; 块创建结果表:1
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11CREATE TABLE INVALID_FOREIGN_KEYS(
`TABLE_SCHEMA` VARCHAR(64),
`TABLE_NAME` VARCHAR(64),
`COLUMN_NAME` VARCHAR(64),
`CONSTRAINT_NAME` VARCHAR(64),
`REFERENCED_TABLE_SCHEMA` VARCHAR(64),
`REFERENCED_TABLE_NAME` VARCHAR(64),
`REFERENCED_COLUMN_NAME` VARCHAR(64),
`INVALID_KEY_COUNT` INT,
`INVALID_KEY_SQL` VARCHAR(1024)
);访问有关隐式提交的MySQL站点:http://dev.mysql.com/doc/refman/5.6/en/implicit-commit.html
如果引用列(也称为外部索引)和引用列(通常是主键)上有索引,则此存储过程将非常快。
感谢这个伟大的答案 - 这是一个非常方便的工具。这是一个稍微修改过程的版本,在输出表中包含SQL以删除带有无效键的键 - 对于确认这些行只是来自丢失/禁用的孤立删除级联规则的情况(而不是来自主要的孤儿)的情况很方便关键变化或其他更复杂的情况)。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | DELIMITER $$ 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), `INVALID_KEY_DELETE_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), `INVALID_KEY_DELETE_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, ';'), `INVALID_KEY_DELETE_SQL` = CONCAT('DELETE ', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '` ', 'FROM ', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', ' ', 'LEFT JOIN `', REFERENCED_TABLE_SCHEMA_VAR, '`.`', REFERENCED_TABLE_NAME_VAR, '`', ' ', 'ON (', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', '.`', COLUMN_NAME_VAR, '`', ' = ', '`', REFERENCED_TABLE_SCHEMA_VAR, '`.`', REFERENCED_TABLE_NAME_VAR, '`', '.`', REFERENCED_COLUMN_NAME_VAR, '`', ') ', 'WHERE ', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', '.`', COLUMN_NAME_VAR, '`', ' IS NOT NULL ', 'AND ', '`', REFERENCED_TABLE_SCHEMA_VAR, '`.`', REFERENCED_TABLE_NAME_VAR, '`', '.`', REFERENCED_COLUMN_NAME_VAR, '`', ' IS NULL', ';'); 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; |
我修改了脚本来处理多列外键。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | CREATE PROCEDURE `ANALYZE_INVALID_FOREIGN_KEYS`(IN `checked_database_name` VARCHAR(64), IN `checked_table_name` VARCHAR(64), IN `temporary_result_table` ENUM('Y', 'N')) LANGUAGE SQL NOT DETERMINISTIC READS SQL DATA SQL SECURITY DEFINER COMMENT '' 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; SET @prev_name = ''; SET @from_part = ''; SET @where_part = ''; SET @where_nullable = ''; 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; IF (@prev_name <> CONSTRAINT_NAME_VAR AND @from_part <> '' AND @where_part <> '') THEN SET @full_query = CONCAT('SELECT COUNT(*) ', @from_part, ' WHERE (', @where_nullable , ') AND ', @from_where_part, 'WHERE ', @where_part, ') INTO @invalid_key_count;'); SET @invalid_query = CONCAT('SELECT * ', @from_part, ' WHERE (', @where_nullable , ') AND ', @from_where_part, 'WHERE ', @where_part, ')'); 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` = NULL, `CONSTRAINT_NAME` = CONSTRAINT_NAME_VAR, `REFERENCED_TABLE_SCHEMA` = REFERENCED_TABLE_SCHEMA_VAR, `REFERENCED_TABLE_NAME` = REFERENCED_TABLE_NAME_VAR, `REFERENCED_COLUMN_NAME` = NULL, `INVALID_KEY_COUNT` = @invalid_key_count, `INVALID_KEY_SQL` = @invalid_query; END IF; DEALLOCATE PREPARE stmt; SET @where_part = ''; SET @where_nullable = ''; END IF; IF (LENGTH(@where_part) > 0) THEN SET @where_nullable = CONCAT(@where_nullable, ' OR '); SET @where_part = CONCAT(@where_part, ' AND '); ELSE SET @from_part = CONCAT('FROM ', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', ' AS REFERRING '); SET @from_where_part = CONCAT('NOT EXISTS (SELECT * FROM `', REFERENCED_TABLE_SCHEMA_VAR, '`.`', REFERENCED_TABLE_NAME_VAR, '`', ' AS REFERRED '); END IF; SET @where_nullable = CONCAT(@where_nullable, 'REFERRING.', COLUMN_NAME_VAR, ' IS NOT NULL'); SET @where_part = CONCAT(@where_part, 'REFERRING.', COLUMN_NAME_VAR, ' = ', 'REFERRED.', REFERENCED_COLUMN_NAME_VAR); SET @prev_name = CONSTRAINT_NAME_VAR; END LOOP foreign_key_cursor_loop; IF (@where_part <> '' AND @from_part <> '') THEN SET @full_query = CONCAT('SELECT COUNT(*) ', @from_part, ' WHERE (', @where_nullable , ') AND ', @from_where_part, 'WHERE ', @where_part, ') INTO @invalid_key_count;'); SET @invalid_query = CONCAT('SELECT * ', @from_part, ' WHERE (', @where_nullable , ') AND ', @from_where_part, 'WHERE ', @where_part, ')'); 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` = NULL, `CONSTRAINT_NAME` = CONSTRAINT_NAME_VAR, `REFERENCED_TABLE_SCHEMA` = REFERENCED_TABLE_SCHEMA_VAR, `REFERENCED_TABLE_NAME` = REFERENCED_TABLE_NAME_VAR, `REFERENCED_COLUMN_NAME` = NULL, `INVALID_KEY_COUNT` = @invalid_key_count, `INVALID_KEY_SQL` = @invalid_query; END IF; DEALLOCATE PREPARE stmt; END IF; END |
相同的检查,但无效的UNIQUE键分析:
- >小错误/功能:它也会报告重复的空值。 (虽然mysql允许重复的空值)。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | DELIMITER $$ DROP PROCEDURE IF EXISTS ANALYZE_INVALID_UNIQUE_KEYS$$ CREATE PROCEDURE `ANALYZE_INVALID_UNIQUE_KEYS`( checked_database_name VARCHAR(64), checked_table_name VARCHAR(64)) LANGUAGE SQL NOT DETERMINISTIC READS SQL DATA BEGIN DECLARE TABLE_SCHEMA_VAR VARCHAR(64); DECLARE TABLE_NAME_VAR VARCHAR(64); DECLARE COLUMN_NAMES_VAR VARCHAR(1000); DECLARE CONSTRAINT_NAME_VAR VARCHAR(64); DECLARE done INT DEFAULT 0; DECLARE unique_key_cursor CURSOR FOR select kcu.table_schema sch, kcu.table_name tbl, group_concat(kcu.column_name) colName, kcu.constraint_name constName from information_schema.table_constraints tc join information_schema.key_column_usage kcu on kcu.constraint_name=tc.constraint_name and kcu.constraint_schema=tc.constraint_schema and kcu.table_name=tc.table_name where kcu.table_schema like checked_database_name and kcu.table_name like checked_table_name and tc.constraint_type="UNIQUE" group by sch, tbl, constName; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; DROP TEMPORARY TABLE IF EXISTS INVALID_UNIQUE_KEYS; CREATE TEMPORARY TABLE INVALID_UNIQUE_KEYS( `TABLE_SCHEMA` VARCHAR(64), `TABLE_NAME` VARCHAR(64), `COLUMN_NAMES` VARCHAR(1000), `CONSTRAINT_NAME` VARCHAR(64), `INVALID_KEY_COUNT` INT ); OPEN unique_key_cursor; unique_key_cursor_loop: LOOP FETCH unique_key_cursor INTO TABLE_SCHEMA_VAR, TABLE_NAME_VAR, COLUMN_NAMES_VAR, CONSTRAINT_NAME_VAR; IF done THEN LEAVE unique_key_cursor_loop; END IF; SET @from_part = CONCAT('FROM (SELECT COUNT(*) counter FROM', '`', TABLE_SCHEMA_VAR, '`.`', TABLE_NAME_VAR, '`', ' GROUP BY ', COLUMN_NAMES_VAR , ') as s where s.counter > 1'); 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_UNIQUE_KEYS SET `TABLE_SCHEMA` = TABLE_SCHEMA_VAR, `TABLE_NAME` = TABLE_NAME_VAR, `COLUMN_NAMES` = COLUMN_NAMES_VAR, `CONSTRAINT_NAME` = CONSTRAINT_NAME_VAR, `INVALID_KEY_COUNT` = @invalid_key_count; END IF; DEALLOCATE PREPARE stmt; END LOOP unique_key_cursor_loop; END$$ DELIMITER ; CALL ANALYZE_INVALID_UNIQUE_KEYS('%', '%'); DROP PROCEDURE IF EXISTS ANALYZE_INVALID_UNIQUE_KEYS; SELECT * FROM INVALID_UNIQUE_KEYS; |
没有工具可以做到这一点。但是你可以编写一个脚本,它将遍历所有表,删除并重新创建外键约束。在娱乐方面,如果出现问题,将会出现错误。