Create dynamic sql statement and get the result : Execute Immediate « PL SQL « Oracle PL / SQL






Create dynamic sql statement and get the result

    

SQL> CREATE TABLE EMP(
  2      EMPNO NUMBER(4) NOT NULL,
  3      ENAME VARCHAR2(10),
  4      JOB VARCHAR2(9),
  5      MGR NUMBER(4),
  6      HIREDATE DATE,
  7      SAL NUMBER(7, 2),
  8      COMM NUMBER(7, 2),
  9      DEPTNO NUMBER(2)
 10  );

Table created.

SQL>
SQL> INSERT INTO EMP VALUES(7369, 'SMITH', 'CLERK', 7902,TO_DATE('17-DEC-1980', 'DD-MON-YYYY'), 800, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7499, 'ALLEN', 'SALESMAN', 7698,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 1600, 300, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7521, 'WARD', 'SALESMAN', 7698,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 1250, 500, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7566, 'JONES', 'MANAGER', 7839,TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7654, 'MARTIN', 'SALESMAN', 7698,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250, 1400, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7698, 'BLAKE', 'MANAGER', 7839,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7782, 'CLARK', 'MANAGER', 7839,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES(7788, 'SCOTT', 'ANALYST', 7566,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7839, 'KING', 'PRESIDENT', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

1 row created.

SQL> INSERT INTO EMP VALUES(7844, 'TURNER', 'SALESMAN', 7698,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500, 0, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7876, 'ADAMS', 'CLERK', 7788,TO_DATE('12-JAN-1983', 'DD-MON-YYYY'), 1100, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7900, 'JAMES', 'CLERK', 7698,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 950, NULL, 30);

1 row created.

SQL> INSERT INTO EMP VALUES(7902, 'FORD', 'ANALYST', 7566,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

1 row created.

SQL> INSERT INTO EMP VALUES(7934, 'MILLER', 'CLERK', 7782,TO_DATE('23-JAN-1982', 'DD-MON-YYYY'), 1300, NULL, 10);

1 row created.

SQL>
SQL> create or replace function get_value_dyn( p_empno in number, p_cname in varchar2 ) return varchar2
  2  as
  3      l_value  varchar2(4000);
  4  begin
  5      execute immediate 'select ' || p_cname || ' from emp where empno = :x'
  6      into l_value
  7      using p_empno;
  8      return l_value;
  9  end;
 10  /

Function created.

SQL>
SQL>
SQL> declare
  2          l_dummy varchar2(30);
  3  begin
  4      for i in 1 .. 500
  5      loop
  6          for x in ( select empno from emp )
  7          loop
  8              l_dummy := get_value_dyn(x.empno, 'ENAME' );
  9              l_dummy := get_value_dyn(x.empno, 'EMPNO' );
 10              l_dummy := get_value_dyn(x.empno, 'HIREDATE' );
 11          end loop;
 12      end loop;
 13  end;
 14  /

PL/SQL procedure successfully completed.

SQL>
SQL> drop table emp;

Table dropped.

SQL>

   
    
    
    
  








Related examples in the same category

1.EXECUTE IMMEDIATE commands
2.Execute immediate for an insert statement
3.Use EXECUTE IMMEDIATE to call procedure and save the returning value
4.Use execute immediate to insert random numbers
5.execute immediate with 'insert ... using' to pass variable into insert statement
6.Timing Bind variable
7.Call 'execute immediate' to drop table, create table and insert data
8.EXECUTE IMMEDIATE
9.Use parameters in EXECUTE IMMEDIATE
10.Pass value out of dynamic select statement
11.Build up the CREATE TABLE statement and run it with EXECUTE IMMEDIATE
12.Use USING clause with EXECUTE IMMEDIATE to handle bind variables.
13.Use of EXECUTE IMMEDIATE for single-row queries.
14.Create Dynamic Tables
15.Call a stored procedure in dynamic script
16.demonstrates the effect of duplicate placeholders with EXECUTE IMMEDIATE.
17.how to pass a NULL value to EXECUTE IMMEDIATE.
18.Use native dynamic SQL to re-create MyTable.
19.Use DBMS_SQL to re-create MyTable.
20.execute immediate using variable
21.Dynamically create packages
22.Use execute immediate to create dynamic query in a procedure
23.Performance between using statement and string concatenation for dynamic sql