Exceptions in PL/SQL Please use speaker notes for additional information!

Exceptions SET SERVEROUTPUT ON DECLARE v_idno VARCHAR2(5); v_yrgoal NUMBER(7,2); BEGIN SELECT idno, yrgoal INTO v_idno, v_yrgoal FROM donornew WHERE idno > 77777; IF v_yrgoal > 250 THEN v_yrgoal := v_yrgoal * 1.1; END IF; UPDATE donornew SET yrgoal = v_yrgoal WHERE idno = v_idno; EXCEPTION WHEN TOO_MANY_ROWS THEN dbms_output.put_line('Multiple rows meet criteria'); WHEN NO_DATA_FOUND THEN dbms_output.put_line('Not a valid id #'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occurred); END; / SET SERVEROUTPUT OFF SQL> edit preexcep1 There are no records with an id > so the no rows found error is returned and processed.

preexcep1 Not a valid id # PL/SQL procedure successfully completed. output EXCEPTION WHEN TOO_MANY_ROWS THEN dbms_output.put_line('Multiple rows meet criteria'); WHEN NO_DATA_FOUND THEN dbms_output.put_line('Not a valid id #'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occurred); END;

SQL> edit preexcep1x SET SERVEROUTPUT ON DECLARE v_idno VARCHAR2(5); v_yrgoal NUMBER(7,2); BEGIN SELECT idno, yrgoal INTO v_idno, v_yrgoal FROM donornew WHERE idno > 77777; IF v_yrgoal > 250 THEN v_yrgoal := v_yrgoal * 1.1; END IF; UPDATE donornew SET yrgoal = v_yrgoal WHERE idno = v_idno; /* The exception routine has been turned into a comment. EXCEPTION WHEN TOO_MANY_ROWS THEN dbms_output.put_line('Multiple rows meet criteria'); WHEN NO_DATA_FOUND THEN dbms_output.put_line('Not a valid id #'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occured'); */ END; / SET SERVEROUTPUT OFF Without exception preexcep1x DECLARE * ERROR at line 1: ORA-01403: no data found ORA-06512: at line 5

SET SERVEROUTPUT ON DECLARE v_idno VARCHAR2(5); v_yrgoal NUMBER(7,2); BEGIN SELECT idno, yrgoal INTO v_idno, v_yrgoal FROM donornew WHERE idno < 77777; IF v_yrgoal > 250 THEN v_yrgoal := v_yrgoal * 1.1; END IF; UPDATE donornew SET yrgoal = v_yrgoal WHERE idno = v_idno; EXCEPTION WHEN TOO_MANY_ROWS THEN dbms_output.put_line('Multiple rows meet criteria'); WHEN NO_DATA_FOUND THEN dbms_output.put_line('Not a valid id #'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occured'); END; / SET SERVEROUTPUT OFF SQL> edit preexcep1a Multiple records error preexcep1a Multiple rows meet criteria PL/SQL procedure successfully completed.

SQL> SELECT * FROM ordline; ORDNO ITEM NUMORD SQL> SELECT * FROM orderz; ORDNO CUSTI ORDATE JUN JUN JUN JUL-99 Oracle error - not predefined SET SERVEROUTPUT ON DECLARE v_ordno ordline.ordno%TYPE :='123456' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=100; BEGIN INSERT INTO ordline VALUES(v_ordno, v_itemno, v_numord); END; / SET SERVEROUTPUT OFF SQL> edit nonpreex1x nonpreex1x DECLARE * ERROR at line 1: ORA-02291: integrity constraint (SCOTT.ORDNO_FK) violated - parent key not found ORA-06512: at line 6

SET SERVEROUTPUT ON DECLARE e_invalid_ordno EXCEPTION; PRAGMA EXCEPTION_INIT(e_invalid_ordno, -2291); v_ordno ordline.ordno%TYPE :='123456' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=100; BEGIN INSERT INTO ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN e_invalid_ordno THEN dbms_output.put_line('Foreign key problem - no ordno on ORDERZ'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occured'); END; / SET SERVEROUTPUT OFF SQL> edit nonpreex1 Exception for non predefined error nonpreex1 Foreign key problem - no ordno on ORDERZ PL/SQL procedure successfully completed.

User defined SET SERVEROUTPUT ON DECLARE e_numord_over200 EXCEPTION; v_ordno ordline.ordno%TYPE :='000003' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=300; BEGIN IF v_numord > 200 THEN RAISE e_numord_over200; END IF; INSERT INTO ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN e_numord_over200 THEN dbms_output.put_line('NUMORD EXCEEDS USER RANGE ERROR'); WHEN OTHERS THEN dbms_output.put_line('Undefined error occured'); END; / SET SERVEROUTPUT OFF SQL> edit userexcep1 userexcep1 NUMORD EXCEEDS USER RANGE ERROR PL/SQL procedure successfully completed.

SQL> CREATE TABLE test_ordline 2 (ordno VARCHAR2(6), 3 itemno VARCHAR2(4), 4 numord NUMBER(3) CONSTRAINT valid_numord_ch CHECK (numord <= 200)); constraint SQL> edit userexcep2 userexcep2 Error occurred PL/SQL procedure successfully completed. SQL> SELECT * FROM test_ordline; no rows selected SET SERVEROUTPUT ON DECLARE v_ordno ordline.ordno%TYPE :='000003' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=300; BEGIN INSERT INTO test_ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN OTHERS THEN dbms_output.put_line('Error occurred); END; / SET SERVEROUTPUT OFF

userexcep2a Error ORA-02290: check constraint (SCOTT.VALID_NUMORD_CH) violated PL/SQL procedure successfully completed. SQL> edit userexcep2a Constraint - version 2 SET SERVEROUTPUT ON DECLARE v_err_code NUMBER; v_err_msg VARCHAR2(255); v_ordno ordline.ordno%TYPE :='000003' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=300; BEGIN INSERT INTO test_ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN OTHERS THEN v_err_code:= SQLCODE; v_err_msg := SQLERRM; dbms_output.put_line('Error '||TO_CHAR(v_err_code)||' '||v_err_msg); END; / SET SERVEROUTPUT OFF

Constraint - version 3 SQL> edit userexcep2b userexcep2b Constraint problem - numord > 200 PL/SQL procedure successfully completed. SET SERVEROUTPUT ON DECLARE e_invalid_numord EXCEPTION; PRAGMA EXCEPTION_INIT(e_invalid_numord, -2290); v_err_code NUMBER; v_err_msg VARCHAR2(255); v_ordno ordline.ordno%TYPE :='000003' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=300; BEGIN INSERT INTO test_ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN e_invalid_numord THEN dbms_output.put_line('Constraint problem - numord > 200'); WHEN OTHERS THEN v_err_code:= SQLCODE; v_err_msg := SQLERRM; dbms_output.put_line('Error '||TO_CHAR(v_err_code)||' '||v_err_msg); END; / SET SERVEROUTPUT OFF

SET SERVEROUTPUT ON DECLARE e_numord_over200 EXCEPTION; v_err_code NUMBER; v_err_msg VARCHAR2(255); v_ordno ordline.ordno%TYPE :='500003' ; v_itemno ordline.itemno%TYPE :='1212'; v_numord ordline.numord%TYPE :=200; BEGIN IF v_numord > 200 THEN RAISE e_numord_over200; END IF; INSERT INTO ordline VALUES(v_ordno, v_itemno, v_numord); EXCEPTION WHEN e_numord_over200 THEN dbms_output.put_line('NUMORD EXCEEDS USER RANGE ERROR'); WHEN OTHERS THEN v_err_code:= SQLCODE; v_err_msg := SQLERRM; dbms_output.put_line('Undefined error '||TO_CHAR(v_err_code)||' '||v_err_msg); END; / SET SERVEROUTPUT OFF SQL> edit funcexcep1 funcexcep1 Undefined error ORA-02291: integrity constraint (SCOTT.ORDNO_FK) violated - parent key not found PL/SQL procedure successfully completed.

LOOP SQL> edit testexception SET SERVEROUTPUT ON DECLARE e_yrgoal_less100 EXCEPTION; v_idno donortest.idno%TYPE; v_name donortest.name%TYPE; v_yrgoal donortest.yrgoal%TYPE; CURSOR c_donor IS SELECT idno, name, yrgoal FROM donortest; BEGIN OPEN c_donor; LOOP FETCH c_donor INTO v_idno, v_name, v_yrgoal; EXIT WHEN c_donor%NOTFOUND; IF v_yrgoal < 100 THEN RAISE e_yrgoal_less100; END IF; dbms_output.put_line('Row processed: '|| v_name); END LOOP; EXCEPTION WHEN e_yrgoal_less100 THEN dbms_output.put_line(‘YRGOAL < 100 ERROR’); WHEN OTHERS THEN dbms_output.put_line('Undefined error occurred); END; / SET SERVEROUTPUT OFF

SQL> select * from donortest; IDNO NAME STADR CITY ST ZIP DATEFST YRGOAL CONTACT Stephen Daniels 123 Elm St Seekonk MA JUL Amy Costa Jennifer Ames 24 Benefit St Providence RI MAY Susan Jones Carl Hersey 24 Benefit St Providence RI JAN Susan Jones Susan Ash 21 Main St Fall River MA MAR Amy Costa Nancy Taylor 26 Oak St Fall River MA MAR John Adams Robert Brooks 36 Pine St Fall River MA APR Amy Costa Alice Riley 123 Elm Chicago IL DEC John Adams Jim Ryan 12 Elm St. Hingham MA AUG Amy Costa LOOP testexception Row processed: Stephen Daniels Row processed: Jennifer Ames Row processed: Carl Hersey Row processed: Susan Ash YRGOAL < 100 ERROR PL/SQL procedure successfully completed.