PL/SQL异常

CASE_NOT_FOUND

CASE selector
WHEN selector_value_1 THEN statements_1
WHEN selector_value_2 THEN statements_2
...
WHEN selector_value_n THEN statements_n
[ ELSE
  else_statements ]
END CASE;]

The simple CASE statement runs the first statements for which selector_value equals selector. Remaining conditions are not evaluated. If no selector_value equals selector, the CASE statement runs else_statements if they exist and raises the predefined exception CASE_NOT_FOUND otherwise.

CASE
WHEN condition_1 THEN statements_1
WHEN condition_2 THEN statements_2
...
WHEN condition_n THEN statements_n
[ ELSE
  else_statements ]
END CASE;]

The searched CASE statement runs the first statements for which condition is true. Remaining conditions are not evaluated. If no condition is true, the CASE statement runs else_statements if they exist and raises the predefined exception CASE_NOT_FOUND otherwise.

DECLARE
grade CHAR(1);
BEGIN
grade := 'B';
CASE
WHEN grade = 'A' THEN DBMS_OUTPUT.PUT_LINE('Excellent');
WHEN grade = 'B' THEN DBMS_OUTPUT.PUT_LINE('Very Good');
WHEN grade = 'C' THEN DBMS_OUTPUT.PUT_LINE('Good');
WHEN grade = 'D' THEN DBMS_OUTPUT.PUT_LINE('Fair');
WHEN grade = 'F' THEN DBMS_OUTPUT.PUT_LINE('Poor');
END CASE;
EXCEPTION
WHEN CASE_NOT_FOUND THEN
DBMS_OUTPUT.PUT_LINE('No such grade');
END;
/

VALUE_ERROR

The lower and upper bounds of a FOR LOOP statement can be either numeric literals, numeric variables, or numeric expressions. If a bound does not have a numeric value, then PL/SQL raises the predefined exception VALUE_ERROR.

存储过程死循环

1.找到运行存储过程的session

select * from v$session;

如果长时间运行，

select * from v$locked_object;

2.删除该会话

alter system kill session 'sid,serial#';

NO_DATA_FOUND

If the SELECT INTO statement returns no rows, PL/SQL raises the predefined exception NO_DATA_FOUND immediately, before you can check SQL%NOTFOUND.

TOO_MANY_ROWS

If a SELECT INTO statement without a BULK COLLECT clause returns multiple rows, PL/SQL raises the predefined exception TOO_MANY_ROWS

INVALID_CURSOR

After closing a cursor, you cannot fetch records from its result set or reference its attributes. If you try, PL/SQL raises the predefined exception INVALID_CURSOR.

If an explicit cursor is not open, referencing any attribute except %ISOPEN raises the predefined exception INVALID_CURSOR.

CURSOR_ALREADY_OPEN

You can reopen a closed cursor. You must close an explicit cursor before you try to reopen it. Otherwise, PL/SQL raises the predefined exception CURSOR_ALREADY_OPEN.

ROWTYPE_MISMATCH

After opening a cursor variable, you can fetch the rows of the query result set with the FETCH statement.

The return type of the cursor variable must be compatible with the into_clause of the FETCH statement. If the cursor variable is strong, PL/SQL catches incompatibility
at compile time. If the cursor variable is weak, PL/SQL catches incompatibility at run time, raising the predefined exception ROWTYPE_MISMATCH before the first fetch.

DUP_VAL_ON_INDEX

The DUP_VAL_ON_INDEX Exception (ORA-00001) occurs when a program attempts to store a duplicate value or values in a database column that is constrained by a unique index.