HOWTO: Return a Resultset from Oracle Stored Procedures into an ADO Recordset

ID: Q239771

The information in this article applies to:
  • Microsoft Visual FoxPro for Windows, version 6.0

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://www.microsoft.com/data/
  1. 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:


    2. 
*!* 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; "
*!* Step 2 Create the package body string
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; "

*!* Note that the Server name, User ID, and Passwords in the following
*!* SQLSTRINGCONNECT should be changed to reflect the environment.
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
  2. Create a second program named Execado.prg using the code snippet below. This program will be used later to call the Oracle package:


    3. 
PARAMETER var1, var2
PUBLIC oConnection,rs1,rs2,rs3,rs4,is_add
LOCAL lcConnStr,lcAlias
LOCAL Proc_String1,Proc_String2,Proc_String3,Proc_String4
*!* 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.
lcConnStr="DRIVER={Microsoft ODBC for Oracle};" + ;
    "SERVER=MyServer;" + ;
    "UID=MyUserID;PWD=MyPassword"
*!* Create An ADO Connection
oConnection=CREATEOBJECT("ADODB.Connection")
oConnection.ConnectionString = lcConnStr
oConnection.CursorLocation   = 3 && Server Side Cursor
oConnection.OPEN
*!* Build strings that will be used to call the Oracle Package
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})}"

*!* Create An ADO recordset for the first resultset returned from Package Proc1
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 second 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 first resultset returned from Package Proc2
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 second 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

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

*!* Done with the ADO Recordsets, so close
rs1.CLOSE
rs2.CLOSE
rs3.CLOSE
rs4.CLOSE
*!* Done with the ADO Connection, so close
oConnection.CLOSE
  3. Run the Procs.prg program file to create the Oracle package.


  4. After the Procs procedure finishes executing, run the Execado program from the command line, using the following syntax:


    5. 
DO Execado WITH 3,3
  5. Note that four different resultsets are returned to the FoxPro desktop.



REFERENCES

For additional information about returning resultsets from Oracle stored procedures, please click the article numbers below to view the articles in the Microsoft Knowledge Base:

Q174679 HOWTO: Retrieve Resultsets from Oracle Stored Procedures
Q149882 HOWTO: Execute a Stored Procedure on an Oracle Server

© Microsoft Corporation 1999, All Rights Reserved.
Contributions by John Desch, Microsoft Corporation

Additional query words:

Keywords : kbADO kbADO200 kbADO201 kbDatabase kbODBC kbOracle kbVFp600 KbDBFDBC kbGrpFox kbDSupport
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbhowto


Last Reviewed: August 24, 1999
© 2000 Microsoft Corporation. All rights reserved. Terms of Use.