mysql 外键引发的删除失败

mysql> TRUNCATE TABLE role ;

ERROR 1701 (42000): Cannot truncate a table referenced in a foreign key constraint (test.account, CONSTRAINT FK_account_role FOREIGN KEY (roleId) REFERENCES test.role (id))

mysql> TRUNCATE TABLE authority ;

ERROR 1701 (42000): Cannot truncate a table referenced in a foreign key constraint (test.role_authority, CONSTRAINT FK_sccf4fx8omb6jlsy2ra75xxer FOREIGN KEY (authorityId) REFERENCES test.authority (id))

mysql>

mysql> TRUNCATE TABLE role ;

ERROR 1701 (42000): Cannot truncate a table referenced in a foreign key constraint (test.account, CONSTRAINT FK_account_role FOREIGN KEY (roleId) REFERENCES test.role (id))

mysql>

方案1:

SET FOREIGN_KEY_CHECKS = 0;

TRUNCATE table1;

TRUNCATE table2;

SET FOREIGN_KEY_CHECKS = 1;

方案2：

Option 1: which does not risk damage to data integrity:
    Remove constraints
    Perform TRUNCATE
    Delete manually the rows that now have references to nowhere
    Create constraints