The OTHERS Exception Handler : Exception Handle « PL SQL « Oracle PL / SQL

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Oracle PL / SQL » PL SQL » Exception Handle 
The OTHERS Exception Handler
     
SQL>
SQL> CREATE TABLE lecturer (
  2    id               NUMBER(5PRIMARY KEY,
  3    first_name       VARCHAR2(20),
  4    last_name        VARCHAR2(20),
  5    major            VARCHAR2(30),
  6    current_credits  NUMBER(3)
  7    );

Table created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10001'Scott', 'Lawson','Computer Science', 11);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major, current_credits)
  2                VALUES (10002'Mar', 'Wells','History', 4);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10003'Jone', 'Bliss','Computer Science', 8);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10004'Man', 'Kyte','Economics', 8);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10005'Pat', 'Poll','History', 4);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10006'Tim', 'Viper','History', 4);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10007'Barbara', 'Blues','Economics', 7);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10008'David', 'Large','Music', 4);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10009'Chris', 'Elegant','Nutrition', 8);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10010'Rose', 'Bond','Music', 7);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10011'Rita', 'Johnson','Nutrition', 8);

row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10012'Sharon', 'Clear','Computer Science', 3);

row created.

SQL>
SQL>
SQL> CREATE TABLE session (
  2    department       CHAR(3),
  3    course           NUMBER(3),
  4    description      VARCHAR2(2000),
  5    max_lecturer     NUMBER(3),
  6    current_lecturer NUMBER(3),
  7    num_credits      NUMBER(1),
  8    room_id          NUMBER(5)
  9    );

Table created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('HIS', 101'History 101', 3011420000);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('HIS', 301'History 301', 300420004);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('CS', 101'Computer Science 101', 500420001);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 203'Economics 203', 150320002);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('CS', 102'Computer Science 102', 353420003);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 410'Music 410', 54320005);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('ECN', 101'Economics 101', 500420007);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('NUT', 307'Nutrition 307', 202420008);

row created.

SQL>
SQL> INSERT INTO session(department, course, description, max_lecturer, current_lecturer, num_credits, room_id)
  2              VALUES ('MUS', 100'Music 100', 10003, NULL);

row created.

SQL>
SQL>
SQL> CREATE TABLE myLogTable (
  2    code             NUMBER,
  3    message          VARCHAR2(200),
  4    info             VARCHAR2(100)
  5    );

Table created.

SQL>
SQL>
SQL>
SQL> DECLARE
  2    myException EXCEPTION;
  3    studentCount NUMBER(3);
  4    studentMax NUMBER(3);
  5  BEGIN
  6    SELECT current_lecturer, max_lecturer
  7      INTO studentCount, studentMax
  8      FROM session
  9      WHERE department = 'HIS' AND course = 101;
 10    IF studentCount > studentMax THEN
 11      RAISE myException;
 12    END IF;
 13  EXCEPTION
 14    WHEN myException THEN
 15      INSERT INTO myLogTable (infoVALUES ('History 101 has ' || studentCount ||
 16        'lecturer: max allowed is ' || studentMax);
 17    WHEN OTHERS THEN
 18      INSERT INTO myLogTable (infoVALUES ('Another error occurred');
 19  END;
 20  /

PL/SQL procedure successfully completed.

SQL>
SQL> drop table lecturer;

Table dropped.

SQL> drop table session;

Table dropped.

SQL> drop table myLogTable;

Table dropped.

SQL>

   
    
    
    
  
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18. Combines declaring an EXCEPTION variable
19. Insert error message to a table in exception handler
20. Mapping a user-defined error code to an EXCEPTION variable
21. This script demonstrates the EXCEPTION_INIT pragma.
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