Catch 'cannot get lock exception' : Your Exception « PL SQL Programming « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » PL SQL Programming » Your Exception 
24. 18. 3. Catch 'cannot get lock exception'
SQL> CREATE TABLE EMP (EMPNO NUMBER(4NOT NULL,
  2                    ENAME VARCHAR2(10),
  3                    JOB VARCHAR2(9),
  4                    MGR NUMBER(4),
  5                    HIREDATE DATE,
  6                    SAL NUMBER(72),
  7                    COMM NUMBER(72),
  8                    DEPTNO NUMBER(2));

Table created.

SQL>
SQL> INSERT INTO EMP VALUES (7369'SMITH', 'CLERK',    7902, TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7499'ALLEN', 'SALESMAN', 7698, TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 160030030);

row created.

SQL> INSERT INTO EMP VALUES (7521'WARD',  'SALESMAN', 7698, TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 125050030);

row created.

SQL> INSERT INTO EMP VALUES (7566'JONES', 'MANAGER',  7839, TO_DATE('2-APR-1981',  'DD-MON-YYYY'), 2975, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7654'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250140030);

row created.

SQL> INSERT INTO EMP VALUES (7698'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

row created.

SQL> INSERT INTO EMP VALUES (7782'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES (7788'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7839'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES (7844'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500030);

row created.

SQL> INSERT INTO EMP VALUES (7876'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7900'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

row created.

SQL> INSERT INTO EMP VALUES (7902'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES (7934'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

row created.

SQL>
SQL>
SQL>
SQL> DECLARE
  2    no_lock EXCEPTION;
  3    pragma EXCEPTION_INIT(no_lock, -00054);
  4  BEGIN
  5    FOR my_rec IN (SELECT from EMP FOR UPDATE NOWAIT)
  6    LOOP
  7      DBMS_OUTPUT.PUT_LINE ('Employee: ' || my_rec.ename);
  8    END LOOP;
  9  EXCEPTION
 10    WHEN no_lock THEN
 11      DBMS_OUTPUT.PUT_LINE ('Could not get lock.  Try again later');
 12  END;
 13  /
Employee: SMITH
Employee: ALLEN
Employee: WARD
Employee: JONES
Employee: MARTIN
Employee: BLAKE
Employee: CLARK
Employee: SCOTT
Employee: KING
Employee: TURNER
Employee: ADAMS
Employee: JAMES
Employee: FORD
Employee: MILLER

PL/SQL procedure successfully completed.

SQL>
SQL> drop table emp;

Table dropped.

SQL>
24. 18. Your Exception
24. 18. 1. Create your own no_data_found EXCEPTION
24. 18. 2. An example showing handling of pre-defined exceptions
24. 18. 3. Catch 'cannot get lock exception'
24. 18. 4. Handling user-defined exceptions with a WHEN clause
24. 18. 5. An example of using PRAGMA EXCEPTION_INIT
24. 18. 6. Assign custom exception a number
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