Microsoft KB Archive/239771

= How to return a resultset from Oracle stored procedures into an ADO recordset =

Article ID: 239771

Article Last Modified on 2/24/2005

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APPLIES TO


 * Microsoft Visual FoxPro 6.0 Professional Edition
 * Microsoft Visual FoxPro 7.0 Professional Edition
 * Microsoft Visual FoxPro 8.0 Professional Edition
 * Microsoft Visual FoxPro 9.0 Professional Edition

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This article was previously published under Q239771



SUMMARY
This article illustrates how use the Microsoft ODBC Driver for Oracle version 2.0 and later with an Oracle PL/SQL package to return resultsets from an Oracle stored procedure to an ADO recordset.



MORE INFORMATION
With the release of the Microsoft ODBC Driver for Oracle version 2.0 and higher, it is possible to retrieve resultsets from Oracle stored procedures. By creating Oracle stored procedures that return parameters of type TABLE, row, and column, data can be returned that can then be manipulated and displayed as a resultset.

The resultsets created by the Microsoft ODBC Driver for Oracle version 2.0 and 2.5 using Oracle stored procedures are READ ONLY and Static. Retrieving a resultset requires the creation of an Oracle Package.

Before beginning to work with the Visual FoxPro application, an Oracle package called FoxPackage must be created. FoxPackage is taken from the Help File for Microsoft ODBC Driver for Oracle: Advanced Topics: "Returning Array Parameters from Stored Procedures".

Note The following code requires installation of Microsoft Data Access Components (MDAC) version 2.x or later. MDAC is included in the data components of Visual Studio 6.0 or can be downloaded from the following Web site:

http://msdn.microsoft.com/dataaccess

  Create a program file named Procs.prg using the code snippet below. This code will be used to create an Oracle package definition and package body: *!* Step 1 Create the package definition string Proc_String1="CREATE OR REPLACE PACKAGE FoxPackage AS " + CHR(13) + ; CHR(10) + ; "  TYPE t_id is TABLE of  NUMBER(5) " + CHR(13) + CHR(10) + ; "   INDEX BY BINARY_INTEGER; " + CHR(13) + CHR(10) + ; "  TYPE t_Course is TABLE of VARCHAR2(10) " + CHR(13) + CHR(10) + ; "   INDEX BY BINARY_INTEGER; " + CHR(13) + CHR(10) + ; "  TYPE t_Dept is TABLE of VARCHAR2(5) " + CHR(13) + CHR(10) + ; "   INDEX BY BINARY_INTEGER; " + CHR(13) + CHR(10) + ; "  TYPE t_pk1Type1 IS TABLE OF VARCHAR2(100) " + CHR(13) + CHR(10) + ; "   INDEX BY BINARY_INTEGER; " + CHR(13) + CHR(10) + ; "  TYPE t_pk1Type2 IS TABLE OF NUMBER(5) " + CHR(13) + CHR(10) + ; "   INDEX BY BINARY_INTEGER; " + CHR(13) + CHR(10) + ; "  PROCEDURE proc1 " + CHR(13) + CHR(10) + ; "  (   o_id           OUT  t_id, " + CHR(13) + CHR(10) + ;   "       ao_course      OUT  t_Course, " + CHR(13) + CHR(10) + ;   "       ao_dept        OUT  t_Dept " + CHR(13) + CHR(10) + ;   "   ); " + CHR(13) + CHR(10) + ; "  PROCEDURE proc2 " + CHR(13) + CHR(10) + ; "  ( " + CHR(13) + CHR(10) + ;   "         i_Arg1         IN   NUMBER, " + CHR(13) + CHR(10) + ;   "         ao_Arg2        OUT  t_pk1Type1, " + CHR(13) + CHR(10) + ;   "         ao_Arg3        OUT  t_pk1Type2 " + CHR(13) + CHR(10) + ;   "   ); " + CHR(13) + CHR(10) + ; "  END FoxPackage; " Proc_String2="CREATE OR REPLACE PACKAGE BODY FoxPackage AS " + CHR(13) + ; CHR(10) + "  PROCEDURE  proc1 " + CHR(13) + CHR(10) + ; "    ( " + CHR(13) + CHR(10) + ;   "         o_id           OUT  t_id, " + CHR(13) + CHR(10) + ;   "         ao_course      OUT  t_Course, " + CHR(13) + CHR(10) + ;   "         ao_dept        OUT  t_Dept " + CHR(13) + CHR(10) + ;   "     ) " + CHR(13) + CHR(10) + ; "  AS " + CHR(13) + CHR(10) + ; "  BEGIN " + CHR(13) + CHR(10) + ; "        o_id(1):= 200; " + CHR(13) + CHR(10) + ; "        ao_course(1) :=  'M101'; " + CHR(13) + CHR(10) + ; "        ao_dept(1) :=  'EEE' ; " + CHR(13) + CHR(10) + ; "        o_id(2) := 201; " + CHR(13) + CHR(10) + ; "        ao_course(2) :=  'PHY320'; " + CHR(13) + CHR(10) + ; "        ao_dept(2) :=  'ECE' ; " + CHR(13) + CHR(10) + ; "  END proc1; " + CHR(13) + CHR(10) + ; "  PROCEDURE proc2 " + CHR(13) + CHR(10) + ; "    ( " + CHR(13) + CHR(10) + ;   "         i_Arg1         IN   NUMBER, " + CHR(13) + CHR(10) + ;   "         ao_Arg2        OUT  t_pk1Type1, " + CHR(13) + CHR(10) + ;   "         ao_Arg3        OUT  t_pk1Type2 " + CHR(13) + CHR(10) + ;   "     ) " + CHR(13) + CHR(10) + ; "  AS " + CHR(13) + CHR(10) + ; "        i  NUMBER; " + CHR(13) + CHR(10) + ; "  BEGIN " + CHR(13) + CHR(10) + ; "     FOR i IN 1 .. i_Arg1 LOOP " + CHR(13) + CHR(10) + ; "        ao_Arg2(i) := 'Row Number ' || to_char(i); " + CHR(13) + ; CHR(10) + ; "        END LOOP; " + CHR(13) + CHR(10) + ; "        FOR i IN 1 .. i_Arg1 LOOP " + CHR(13) + CHR(10) + ; "           ao_Arg3(i) := i; " + CHR(13) + CHR(10) + ; "           END LOOP; " + CHR(13) + CHR(10) + ; "     END proc2; " + CHR(13) + CHR(10) + ; "  END FoxPackage; "
 * !* Step 2 Create the package body string

gnConnHandle=SQLSTRINGCONN('DRIVER={Microsoft ODBC for Oracle};' + ;  'SERVER=MyServer;UID=MyUserID;PWD=MyPassword') IF gnConnHandle>0 Create_Pack=SQLEXEC(gnConnHandle,Proc_String1) IF Create_Pack>0 Create_Body=SQLEXEC(gnConnHandle,Proc_String2) ENDIF =SQLDISCONN(gnConnHandle) ENDIF   Create a second program named Execado.prg using the code snippet below. This program will be used later to call the Oracle package: PARAMETER var1, var2 PUBLIC oConnection,rs1,rs2,rs3,rs4,is_add LOCAL lcConnStr,lcAlias LOCAL Proc_String1,Proc_String2,Proc_String3,Proc_String4 lcConnStr="DRIVER={Microsoft ODBC for Oracle};" + ; "SERVER=MyServer;" + ; "UID=MyUserID;PWD=MyPassword" oConnection=CREATEOBJECT("ADODB.Connection") oConnection.ConnectionString = lcConnStr oConnection.CursorLocation  = 3 && Server Side Cursor oConnection.OPEN Proc_String1 = "{call FoxPackage.Proc1({resultset 3, o_id, " + ;   "ao_course, ao_dept})}" Proc_String2 = "{call FoxPackage.Proc1({resultset 3, o_id}, " + ;   "{resultset 3, ao_course}, {resultset 3, ao_dept})}" Proc_String3 = "{call FoxPackage.Proc2(" + ALLTRIM(STR(var1)) + ;   ",{resultset 3, ao_Arg2, ao_Arg3})}" Proc_String4 = "{call FoxPackage.Proc2(" + ALLTRIM(STR(var2)) + ;   ",{resultset 3, ao_Arg2}, {resultset 3, ao_Arg3})}"
 * !* Note that the Server name, User ID, and Passwords in the following
 * !* SQLSTRINGCONNECT should be changed to reflect the environment.
 * !* Setup a DSN-Less connection to Sample Data Files
 * !* Note that the Server name, User ID, and Passwords in the following
 * !* string should be changed to reflect the environment.
 * !* Create An ADO Connection
 * !* Build strings that will be used to call the Oracle Package

rs1=CREATEOBJECT("ADODB.Recordset") rs1.activeconnection        = oConnection rs1.CursorLocation          = 3 && Client Side Cursor rs1.cursortype              = 1 && OpenKeyset rs1.LockType                = 3 && LockOptimistic rs1.OPEN(Proc_String1) rs1.movefirst
 * !* Create An ADO recordset for the first resultset returned from Package Proc1

rs2=CREATEOBJECT("ADODB.Recordset") rs2.activeconnection        = oConnection rs2.CursorLocation          = 3 && Client Side Cursor rs2.cursortype              = 1 && OpenKeyset rs2.LockType                = 3 && LockOptimistic rs2.OPEN(Proc_String2) rs2.movefirst
 * !* Create An ADO recordset for the second resultset returned from Package Proc1

rs3=CREATEOBJECT("ADODB.Recordset") rs3.activeconnection        = oConnection rs3.CursorLocation          = 3 && Client Side Cursor rs3.cursortype              = 1 && OpenKeyset rs3.LockType                = 3 && LockOptimistic rs3.OPEN(Proc_String3) rs3.movefirst
 * !* Create An ADO recordset for the first resultset returned from Package Proc2

rs4=CREATEOBJECT("ADODB.Recordset") rs4.activeconnection        = oConnection rs4.CursorLocation          = 3 && Client Side Cursor rs4.cursortype              = 1 && OpenKeyset rs4.LockType                = 3 && LockOptimistic rs4.OPEN(Proc_String4) rs4.movefirst
 * !* Create An ADO recordset for the second resultset returned from Package Proc2

? "Resultset 1" DO WHILE !rs1.EOF FOR i=0 TO rs1.FIELDS.COUNT-1 ? rs1.FIELDS(i).VALUE NEXT rs1.movenext ENDDO
 * !* Navigate through the first ADO Recordset

? "Resultset 2" DO WHILE !rs2.EOF FOR i=0 TO rs2.FIELDS.COUNT-1 ? rs2.FIELDS(i).VALUE NEXT rs2.movenext ENDDO
 * !* Navigate through the second ADO Recordset

? "Resultset 3" DO WHILE !rs3.EOF FOR i=0 TO rs3.FIELDS.COUNT-1 ? rs3.FIELDS(i).VALUE NEXT rs3.movenext ENDDO
 * !* Navigate through the third ADO Recordset

? "Resultset 4" DO WHILE !rs4.EOF FOR i=0 TO rs4.FIELDS.COUNT-1 ? rs4.FIELDS(i).VALUE NEXT rs4.movenext ENDDO
 * !* Navigate through the fourth ADO Recordset

rs1.CLOSE rs2.CLOSE rs3.CLOSE rs4.CLOSE oConnection.CLOSE  Run the Procs.prg program file to create the Oracle package.  After the Procs procedure finishes executing, run the Execado program from the command line, using the following syntax: DO Execado WITH 3,3  Note that four different resultsets are returned to the Visual FoxPro desktop.
 * !* Done with the ADO Recordsets, so close
 * !* Done with the ADO Connection, so close

