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How to update a row in a table using a PL/SQL stored procedure - Oracle

In this article, I shall go through a set of PL/SQL stored procedures which are very frequently used for CRUD operations. These stored procedures are mainly helpful for the developers who develop client applications (involving business logic or user interface design and programming) and who need a data layer to be implemented using PL/SQL stored procedures. The article is not targeted at pure PL/SQL developers.

TABLE OF CONTENTS:
  1. Developing Simple PL/SQL Stored Procedures for CRUD Operations
  2. Validate information before inserting a row using a PL/SQL stored procedure: code
  3. Validate information before inserting a row using a PL/SQL stored procedure: explanation
  4. How to update a row in a table using a PL/SQL stored procedure
  5. Deleting and retrieving values using PL/SQL stored procedures
By: Jagadish Chatarji
Rating: starstarstarstarstar / 41
February 19, 2007

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The following is the stored procedure which can be used to modify the information belonging to an employee:

create or replace procedure p_emp_update (p_empno emp.empno%type,
p_ename emp.ename%type, p_sal emp.sal%type, p_deptno emp.deptno%
type) as
      Invalid_sal exception;
      Invalid_deptno    exception;
      Invalid_empno exception;
begin
      if p_sal<100 or p_sal>10000 then
            raise invalid_sal;
      end if;
      declare
            dummy_var   varchar(10);
      begin
            select 'exists' into dummy_var
            from dept
            where deptno = p_deptno;
      exception
            when no_data_found then
                  raise Invalid_deptno;
            when others then
                  raise_application_error(-20011, sqlerrm);
      end;
      update emp set
            ename=p_ename,
            sal=p_sal,
            deptno=p_deptno
      where empno=p_empno;
      if sql%notfound or sql%rowcount=0 then
            rollback;
            raise Invalid_empno;
      end if;
      commit;
exception
      when invalid_sal then
            raise_application_error(-20001, 'Salary must be in
between 100 and 10000');
      when invalid_deptno then
            raise_application_error(-20001, 'Department doesn't
exist');
      when invalid_empno then
            raise_application_error(-20001, 'Employee does not
exist');
      when others then
            raise_application_error(-20011, sqlerrm);
end;
/

In the above stored procedure, the following is the code fragment which needs some attention:

      if sql%notfound or sql%rowcount=0 then
            rollback;
            raise Invalid_empno;
      end if;

The above IF condition evaluates whether the previous DML statement (UPDATE in this scenario) updated any information successfully or not.



 
 
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