这是我的代码:
Declare
violation_of_constraint EXCEPTION;
BEGIN
-- (A FEW INSERTS HERE: A, B, C)
SAVEPOINT X;
-- (ANOTHER INSERT HERE: D)
IF DUP_VAL_ON_INDEX THEN
ROLLBACK TO X;
COMMIT;
RAISE violation_of_constraint;
END IF;
EXCEPTION
WHEN violation_of_constraint THEN
DBMS_OUTPUT.PUT_LINE('Value already exists');
COMMIT;
END;
/
当我运行它(从sql命令行)时,在第11行出现此错误:
expression is of wrong type (line 11 is "IF DUP_VAL_ON_INDEX THEN")
怎么了
最佳答案
您需要定义一个嵌套的PL/SQL
块,并将EXCEPTION BLOCK中的异常作为WHEN DUP_VAL_ON_INDEX
处理...
不应为IF DUP_VAL_ON_INDEX
Declare
violation_of_constraint EXCEPTION;
BEGIN
BEGIN
-- (A FEW INSERTS HERE: A, B, C)
SAVEPOINT X;
-- (ANOTHER INSERT HERE: D)
EXCEPTION
WHEN DUP_VAL_ON_INDEX THEN
ROLLBACK TO X;
COMMIT;
RAISE violation_of_constraint;
END;
EXCEPTION
WHEN violation_of_constraint THEN
DBMS_OUTPUT.PUT_LINE('Value already exists');
COMMIT;
END;
/
关于sql - (Oracle SQL)捕获唯一约束错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22175894/