Dynamic where condition in a stored procedure

oracle-11g-r2plsql

I am using Oracle 11g. I am trying to get the table data with this procedure:

CREATE OR REPLACE PROCEDURE test(p_table IN varchar2)
IS
v_sqltxt varchar2(4000);
BEGIN
v_sqltxt:='select count(*) from '||p_table;
dbms_output.put_line(v_sqltxt);
END;
/

But I am unable to give the where condition dynamically. How can I do that?

Best Answer

You'll need to execute your SQL statement. Use execute immediate for this. And because you're selecting a value you'll need to execute immediate ... into it, something like this (replacing 3 > 2 with your own where condition:

CREATE OR REPLACE PROCEDURE test(p_table IN varchar2) IS
  v_sqltxt varchar2(4000);
  v_count integer;
BEGIN
  v_sqltxt:='select count(*) from '||p_table||' where 3 > 2';

  execute immediate v_sqltxt into v_count;

  dbms_output.put_line(v_count);
END;
/

Related Solutions

How to make stored procedure with outputs OUT sys_refcursor, OUT varchar2, and OUT number, then use in c#.net app

Your procedure is missing two OUT parameters:

PROCEDURE myprocedure (myinput      IN Varchar2, 
                       myretcursor  OUT sys_refcursor,
                       p_count      OUT NUMBER,
                       p_message    OUT VARCHAR2) IS
BEGIN
   OPEN myretcursor FOR
      SELECT * FROM MYTABLE;
   p_count := 123;
   p_message := 'message';
END myprocedure

You would also need to modify your C# code to register the new OUT parameters accordingly.

How to embed a sub-prodecure call in a SELECT statement in an Oracle 11g PL/SQL stored procedure

It wouldn't perform as well, but to meet your requirements given your limitations, you could use a pipelined result set. Both your original procedure and your new procedure could then use the function. The original one would return the entire results, and the new procedure would wrap the function in a larger query that does the GROUP BY. In this way the core query code would not be duplicated. Here is a pipelined result set example along with two queries using it:

create or replace PACKAGE Example AUTHID Definer AS

Type tRow Is Record (
     F1 Date
   , F2 Date
   );
Type tTable Is Table of tRow;
Function PipelineResult(pDate In Date DEFAULT sysdate) Return tTable Pipelined;

END Example;
/


create or replace PACKAGE BODY Example AS

Function PipelineResult(pDate In Date DEFAULT sysdate) Return tTable Pipelined AS
   vYesterday Date := trunc(sysdate-1);
Begin
  For vRow IN (
      SELECT pDate, vYesterday FROM DUAL
      UNION ALL
      SELECT pDate, vYesterday-1 FROM DUAL
      UNION ALL
      SELECT pDate+1, vYesterday FROM DUAL
  )
  Loop
    Pipe Row(vRow);
  End Loop;
End;

END Example;
/


SELECT * FROM TABLE(Example.PipelineResult);

SELECT F1, count(*) FROM TABLE(Example.PipelineResult) GROUP BY F1;

Best Answer

Related Solutions

How to make stored procedure with outputs OUT sys_refcursor, OUT varchar2, and OUT number, then use in c#.net app

How to embed a sub-prodecure call in a SELECT statement in an Oracle 11g PL/SQL stored procedure

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