mysql 强制InnoDB重新检查表上的外键？

qojgxg4l 于 2023-08-02 发布在 Mysql

关注(0)|答案(5)|浏览(85)

我有一组InnoDB表，我需要通过删除一些行和插入其他行来定期维护这些表。有几个表具有引用其他表的外键约束，因此这意味着表加载顺序很重要。为了插入新行而不必担心表的顺序，我用途：

SET FOREIGN_KEY_CHECKS=0;

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之前，然后：

SET FOREIGN_KEY_CHECKS=1;

型
之后。
加载完成后，我想检查更新后的表中的数据是否仍然保持引用完整性--新行是否没有破坏外键约束--但似乎没有办法做到这一点。
作为测试，我输入了我确信违反了外键约束的数据，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，并在加载过程中保持外键检查，这将不允许我在具有自引用外键约束的表中加载数据，因此这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？

mysql

来源：https://stackoverflow.com/questions/2250775/force-innodb-to-recheck-foreign-keys-on-a-table-tables

5条答案

按热度按时间

nr9pn0ug1#

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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您可以使用这个存储程序来检查all数据库中是否有无效的外部索引键。结果将被加载到INVALID_FOREIGN_KEYS表中。ANALYZE_INVALID_FOREIGN_KEYS的参数：
1.数据库名称模式（LIKE样式）
1.表名模式（LIKE样式）

结果是否会是暂时的。它可以是：'Y'、'N'、NULL。
如果是'Y'，则ANALYZE_INVALID_FOREIGN_KEYS结果表将是临时表。临时表对其他会话不可见。可以使用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来跳过事务中的结果表创建，因为MySQL在事务中对CREATE TABLE ...和DROP TABLE ...执行隐式提交，因此结果表的创建会导致事务中出现问题。在这种情况下，您必须使用BEGIN; COMMIT/ROLLBACK;块自行创建结果表：

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)
);

型
访问MySQL站点了解隐式提交：http://dev.mysql.com/doc/refman/5.6/en/implicit-commit.html
INVALID_FOREIGN_KEYS行将只包含无效数据库、表、列的名称。但是，您可以在执行INVALID_FOREIGN_KEYS的INVALID_KEY_SQL列的值（如果有）时看到无效的引用行。
如果引用列上有索引，则此存储过程的速度将非常快。外部索引）和引用的列（通常是主键）。

赞(0）回复(0）举报 2023-08-02

sqserrrh2#

谢谢你的回答-这是一个非常方便的工具。下面是该过程的一个稍微修改的版本，它在输出表中包含SQL以删除具有无效键的键-对于您已经确认这些行只是缺少/禁用删除级联规则的孤立行（而不是主键更改或其他更复杂情况下的孤立行）的情况很方便。

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;

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赞(0）回复(0）举报 2023-08-02

hmae6n7t3#

我修改了脚本来处理多列外键。

DELIMITER $$

DROP PROCEDURE IF EXISTS ANALYZE_INVALID_FOREIGN_KEYS$$

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

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 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_constraint_name = '';
    SET @prev_table_schema = '';
    SET @prev_table_name = '';
    SET @prev_referenced_table_schema = '';
    SET @prev_referenced_table_name = '';

    SET @from_part = '';
    SET @where_part = '';
    SET @where_nullable = '';
    
    SET @all_columns = '';
    SET @all_referenced_columns = '';

    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_constraint_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` = @prev_table_schema, 
                    `TABLE_NAME` = @prev_table_name, 
                    `COLUMN_NAME` = @all_columns, 
                    `CONSTRAINT_NAME` = @prev_constraint_name, 
                    `REFERENCED_TABLE_SCHEMA` = @prev_referenced_table_schema, 
                    `REFERENCED_TABLE_NAME` = @prev_table_name, 
                    `REFERENCED_COLUMN_NAME` = @all_referenced_columns, 
                    `INVALID_KEY_COUNT` = @invalid_key_count,
                    `INVALID_KEY_SQL` = @invalid_query;
            END IF;
            DEALLOCATE PREPARE stmt; 

            SET @where_part = '';
            SET @where_nullable = '';

            SET @all_columns = '';
            SET @all_referenced_columns = '';
        END IF;

        IF (LENGTH(@where_part) > 0) THEN
            SET @where_nullable = CONCAT(@where_nullable, ' OR ');
            SET @where_part = CONCAT(@where_part, ' AND ');
            
            SET @all_columns = CONCAT(@all_columns, ', ', COLUMN_NAME_VAR);
            SET @all_referenced_columns = CONCAT(@all_referenced_columns, ', ', REFERENCED_COLUMN_NAME_VAR);
        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 ');

            SET @all_columns = COLUMN_NAME_VAR;
            SET @all_referenced_columns = REFERENCED_COLUMN_NAME_VAR;
        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_constraint_name = CONSTRAINT_NAME_VAR;
        SET @prev_table_schema = TABLE_SCHEMA_VAR;
        SET @prev_table_name = TABLE_NAME_VAR;
        SET @prev_referenced_table_schema = REFERENCED_TABLE_SCHEMA_VAR;
        SET @prev_referenced_table_name = REFERENCED_TABLE_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` = @prev_table_schema, 
                `TABLE_NAME` = @prev_table_name, 
                `COLUMN_NAME` = @all_columns, 
                `CONSTRAINT_NAME` = @prev_constraint_name, 
                `REFERENCED_TABLE_SCHEMA` = @prev_referenced_table_schema, 
                `REFERENCED_TABLE_NAME` = @prev_table_name, 
                `REFERENCED_COLUMN_NAME` = @all_referenced_columns, 
                `INVALID_KEY_COUNT` = @invalid_key_count,
                `INVALID_KEY_SQL` = @invalid_query;
        END IF;
        DEALLOCATE PREPARE stmt; 
    END IF;
END$$

DELIMITER ;

CALL ANALYZE_INVALID_FOREIGN_KEYS('%', '%', 'Y');
DROP PROCEDURE IF EXISTS ANALYZE_INVALID_FOREIGN_KEYS;

SELECT * FROM INVALID_FOREIGN_KEYS;

字符串

赞(0）回复(0）举报 2023-08-02

kkih6yb84#

没有工具可以做到这一点。但是你可以写一个脚本，它将遍历你所有的表，删除并重新创建外键约束。在重新创建时，如果出现错误，则会出现错误。

赞(0）回复(0）举报 2023-08-02

tyg4sfes5#

相同的检查，但用于无效的UNIQUE密钥分析：
--> * 小bug/功能 *：它也会报告重复的空值。（mysql允许重复的null）。

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;

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mysql 强制InnoDB重新检查表上的外键？

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