Oracle PL/SQL - Declaring a Cursor

Description

Declaring a Cursor

Demo

SQL>
SQL> drop table emp;

Table dropped.-- from   w  w w . ja  v a 2s .c o m
SQL> create table emp(
  2    empno    number(4,0),
  3    ename    varchar2(10),
  4    job      varchar2(9),
  5    mgr      number(4,0),
  6    hiredate date,
  7    sal      number(7,2),
  8    comm     number(7,2),
  9    deptno   number(2,0)
 10  );

Table created.

SQL>
SQL> insert into emp values(7839, 'KING', 'PRESIDENT', null, to_date('17-11-1981','dd-mm-yyyy'), 5000, null, 10);
SQL> insert into emp values(7698, 'BLAKE', 'MANAGER', 7839,to_date('1-5-1981','dd-mm-yyyy'), 2850, null, 30);
SQL> insert into emp values(7782, 'CLARK', 'MANAGER', 7839,to_date('9-6-1981','dd-mm-yyyy'), 2450, null, 10);
SQL> insert into emp values(7566, 'JONES', 'MANAGER', 7839,to_date('2-4-1981','dd-mm-yyyy'), 2975, null, 20);
SQL>
SQL>
SQL> declare
  2       cursor c_countEmps is
  3          select count(*)
  4             from emp;
  5       v_out_nr NUMBER;
  6  begin
  7       open c_countEmps;
  8           fetch c_countEmps into v_out_nr;
  9       close c_countEmps;
 10       DBMS_OUTPUT.put_line('number of emps is:'||v_out_nr);
 11  end;
 12  /
number of emps is:4

PL/SQL procedure successfully completed.

Here the code declares a cursor that will return a single record.

This cursor is called an explicit cursor.

You explicitly declare it in a declaration section of the program and manipulate the cursor else where in the program.

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