MySQL 判断和删除目录和表外键_mysql

-- -- Procedure Of Delete Index -- DROP PROCEDURE IF EXISTS DEL_IDX; CREATE PROCEDURE DEL_IDX(IN P_TABLE_NAME varchar(200), IN P_IDX_NAME VARCHAR(200)) BEGIN DECLARE ST VARCHAR(250);   SET @ST=CONCAT(' DROP INDEX ', P_IDX_NAME, ' ON ', P_TABLE_NAME);   SELECT count(*) INTO @CNT FROM information_schema.statistics WHERE table_name=P_TABLE_NAME and index_name=P_IDX_NAME;   IF @CNT >0 THEN     PREPARE stmt FROM @ST;     EXECUTE stmt;   END IF; END; CALL DEL_IDX('T_NAME, 'IDX_NAME'); DROP PROCEDURE IF EXISTS DEL_IDX;  -- -- Procedure Of Delete FK -- DROP PROCEDURE IF EXISTS DEL_FK; CREATE PROCEDURE DEL_FK(IN P_TABLE_NAME varchar(200), IN F_K_NAME VARCHAR(200)) BEGIN DECLARE ST VARCHAR(250);   SET @ST=CONCAT(' ALTER TABLE ', P_TABLE_NAME, ' DROP FOREIGN KEY ', F_K_NAME);   SELECT COUNT(*) INTO @CNT FROM information_schema.key_column_usage WHERE table_name=P_TABLE_NAME and constraint_name=F_K_NAME;   IF @CNT >0 THEN     PREPARE stmt FROM @ST;     EXECUTE stmt;   END IF; END; CALL DEL_FK('T_NAM, 'FK_NAME); DROP PROCEDURE IF EXISTS DEL_FK;