MySQL:获取约束名称并将其放入一条语句中

Question

我从以下位置获取约束名称:

SELECT
  constraint_name
FROM
  information_schema.REFERENTIAL_CONSTRAINTS
WHERE
  constraint_schema = 'db' AND table_name = 'table';

然后把它从 table 上扔掉。它在本地计算机上手动完成时有效。现在它扰乱了我的 Jenkins 构建的数据库迁移脚本。
有没有办法在一个语句中做到这一点？

Update
Following query gave me Access denied for user root@localhost

DELETE
FROM
  information_schema.REFERENTIAL_CONSTRAINTS
WHERE
  constraint_schema = 'db' AND table_name = 'table';

Answer 1

自动生成要运行的放置约束:

SELECT concat('ALTER TABLE ', TABLE_NAME, ' DROP FOREIGN KEY ', CONSTRAINT_NAME, ';') as theString
FROM information_schema.key_column_usage 
WHERE CONSTRAINT_SCHEMA = 'so_gibberish' 
AND referenced_table_name IS NOT NULL;

+---------------------------------------------------+
| theString                                         |
+---------------------------------------------------+
| ALTER TABLE fc_junction DROP FOREIGN KEY fc_cat;  |
| ALTER TABLE fc_junction DROP FOREIGN KEY fc_food; |
+---------------------------------------------------+

它会自动生成要运行的字符串。必要时按顺序按摩。然后你就走吧。请注意，在 Workbench/sqlyog 中，您当然不会有表格栏输出。