强制InnoDB重新检查表/表上的外键？

Question

强制InnoDB重新检查表/表上的外键？

我有一组InnoDB表,我经常需要通过删除一些行并插入其他行来维护.其中一些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.要插入新行而不必担心表的顺序,我使用:

SET FOREIGN_KEY_CHECKS=0;

Run Code Online (Sandbox Code Playgroud)

之前,然后:

SET FOREIGN_KEY_CHECKS=1;

Run Code Online (Sandbox Code Playgroud)

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,并在加载过程中留在了外键检查,这不会让我在具有自引用外键约束的表加载数据,因此这将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？

Answer 1

小智 97

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;

Run Code Online (Sandbox Code Playgroud)

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INVALID_FOREIGN_KEYS表中.参数ANALYZE_INVALID_FOREIGN_KEYS:

数据库名称模式(LIKE样式)
表名模式(LIKE风格)
结果是否是暂时的.它可以是:'Y','N',NULL.
- 在的情况下,'Y'该ANALYZE_INVALID_FOREIGN_KEYS结果表会临时表.其他会话不会显示临时表.您可以ANALYZE_INVALID_FOREIGN_KEYS(...)与临时结果表并行执行多个存储过程.
- 但是如果您对其他会话的部分结果感兴趣,那么您必须使用'N',然后SELECT * FROM INVALID_FOREIGN_KEYS;从其他会话执行.
- 您必须使用NULL跳过交易结果创建表,因为MySQL执行隐含事务提交的CREATE TABLE ...和DROP TABLE ...,因此结果表的建立将交易产生的问题.在这种情况下,您必须自己创建结果表BEGIN; COMMIT/ROLLBACK;:
```
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)
);
```
  Run Code Online (Sandbox Code Playgroud)
  访问有关隐式提交的MySQL站点:http://dev.mysql.com/doc/refman/5.6/en/implicit-commit.html

该 INVALID_FOREIGN_KEYS行包含无效的数据库,表,列的唯一名称.但是如果有的话,你可以看到无效的引用行和INVALID_KEY_SQL列的值的执行INVALID_FOREIGN_KEYS.

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.

我发现我必须在cursors where子句中的checked_*参数之后添加'collate utf8_general_ci',因为我的信息模式使用utf8_general_ci,因为登录帐户使用更正确的utf8_unicode_ci.没有这个,我在类似条款中收到了排序规则不匹配错误."WHERE`CONSTRAINT_SCHEMA` LIKE checked_database_name collate utf8_general_ci AND`TABLE_NAME` LIKE checked_table_name collate utf8_general_ci AND`REFERENCED_TABLE_SCHEMA` IS NOT NULL; (4认同)
很好的答案。欢迎使用堆栈溢出！ (2认同)

Answer 2

小智 16

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/禁用删除级联规则的孤立的情况(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).

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;

Run Code Online (Sandbox Code Playgroud)

我知道它现在已经老了但是遇到了这个我想知道:你是不是因为DELETE语句没有使用`CONCAT('DELETE REFERRING',@ from_part,';')` (2认同)

Answer 3

nai*_*jed 5

我修改了脚本以处理多列外键。

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;

Run Code Online (Sandbox Code Playgroud)

归档时间：	15 年，10 月前
查看次数：	15946 次
最近记录：	9 年，11 月前