Commit or rollback based on success flag : Boolean Expression « PL SQL « Oracle PL / SQL

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Oracle PL / SQL » PL SQL » Boolean Expression 
Commit or rollback based on success flag
 
SQL> CREATE TABLE emp (
  2    emp_id               NUMBER,
  3    ename             VARCHAR2(40),
  4    hire_date        DATE DEFAULT sysdate,
  5    end_date DATE,
  6    rate     NUMBER(5,2),
  7    CONSTRAINT emp_pk    PRIMARY KEY (emp_id)
  8  );

Table created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (101'Mary', to_date('15-Nov-1961','dd-mon-yyyy'),null,169);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (102'Tom', to_date('16-Sep-1964','dd-mon-yyyy'),to_date('5-May-2004','dd-mon-yyyy'),135);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (104'Peter', to_date('29-Dec-1987','dd-mon-yyyy'),to_date('1-Apr-2004','dd-mon-yyyy'),99);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (105'Mike', to_date('15-Jun-2004','dd-mon-yyyy'),null,121);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (107'Less', to_date('2-Jan-2004','dd-mon-yyyy'),null,45);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (108'Park', to_date('1-Mar-1994','dd-mon-yyyy'),to_date('15-Nov-2004','dd-mon-yyyy'),220);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (110'Ink', to_date('4-Apr-2004','dd-mon-yyyy'),to_date('30-Sep-2004','dd-mon-yyyy'),84);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (111'Tike', to_date('23-Aug-1976','dd-mon-yyyy'),null,100);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (112'Inn', to_date('15-Nov-1961','dd-mon-yyyy'),to_date('4-Apr-2004','dd-mon-yyyy'),70);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (113'Kate', to_date('3-Mar-2004','dd-mon-yyyy'),to_date('31-Oct-2004','dd-mon-yyyy'),300);

row created.

SQL>
SQL>
SQL> DECLARE
  2    success_flag BOOLEAN;
  3  BEGIN
  4    BEGIN
  5      UPDATE emp
  6         SET rate = rate * 1.10;
  7      success_flag := TRUE;
  8    EXCEPTION
  9      WHEN OTHERS THEN
 10        success_flag := false;
 11    END;
 12
 13    IF success_flag THEN
 14      COMMIT;
 15    ELSE
 16      ROLLBACK;
 17      DBMS_OUTPUT.PUT_LINE('ThUPDATE failed.');
 18    END IF;
 19  END;
 20  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL>
SQL>
SQL> drop table emp;

Table dropped.

SQL>

   
  
Related examples in the same category
1. Effects of nulls on boolean expressions: =
2. Effects of nulls on boolean expressions: >, < (2)
3. Use and to link two boolean expressions
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