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