HOW TO: Fill a DataSet from an Oracle Stored Procedure by Using the OLE DB .NET Data Provider with J# .NET (320632)

SUMMARY

This article describes how to fill a DataSet object with the result set from an Oracle stored procedure. The DataSet object is central to supporting disconnected, distributed-data scenarios with ADO.NET. The DataSet object is a memory-resident representation of data that provides a consistent, relational programming model regardless of the data source. The DataSet object represents a complete set of data, including related tables, constraints, and relationships among the tables.

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Requirements

The following list outlines the recommended hardware, software, network infrastructure, and service packs that are required:

• Microsoft Windows XP, Microsoft Windows 2000, or Microsoft Windows NT 4.0 Service Pack 6a
• Microsoft Data Access Components (MDAC) 2.6 or later
• Oracle 8.0 Server or later
• Visual J# .NET
• Oracle client installed on the client computer

This article assumes that you are familiar with the following topics:

• Data definition language (DDL) queries in Oracle
• The Visual J# .NET syntax
• ActiveX Data Objects (ADO)

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To Create the Package in the Oracle Database

1. Use the following code to create a table that is named Person:

   CREATE TABLE person
             (ssn     NUMBER(9) PRIMARY KEY,
              fname   VARCHAR2(15),
              lname   VARCHAR2(20));
   
            INSERT INTO person VALUES(000000001,'Chris','Gray');
   
            INSERT INTO person VALUES(000000002,'Ken','Kwok');
   
            INSERT INTO person VALUES(000000003,'Stephanie','Bourne');
   
            COMMIT;
   					

2. Use the following code to create the package header:

   CREATE OR REPLACE PACKAGE packperson
            AS
                TYPE tssn is TABLE of  NUMBER(10)
                INDEX BY BINARY_INTEGER;
                TYPE tfname is TABLE of VARCHAR2(15)
                INDEX BY BINARY_INTEGER;
                TYPE tlname is TABLE of VARCHAR2(20)
                INDEX BY BINARY_INTEGER;
   
                PROCEDURE allperson
                        (ssn    OUT     tssn,
                         fname  OUT     tfname,
                         lname  OUT     tlname);
              
             END packperson;
             / 
   					

3. Use the following code to create the package body:

   CREATE OR REPLACE PACKAGE BODY packperson
            AS
   
            PROCEDURE allperson
                        (ssn    OUT     tssn,
                         fname  OUT     tfname,
                         lname  OUT     tlname)
            IS
                CURSOR person_cur IS
                        SELECT ssn, fname, lname
                        FROM person;
   
                percount NUMBER DEFAULT 1;
   
            BEGIN
                FOR singleperson IN person_cur
                LOOP
                        ssn(percount) := singleperson.ssn;
                        fname(percount) := singleperson.fname;
                        lname(percount) := singleperson.lname;
                        percount := percount + 1;
                END LOOP;
            END;
   
            END;
            / 
   					

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To Create the Visual J# .NET Program

1. Create a new Visual J# .NET Windows program. By default, Form1 is added to the program.
2. Drag a DataGrid control and a Button control to Form1. By default, DataGrid1 and Button1 are added to Form1.
3. Add the following code as the first line in the Code window:

   import System.Data.OleDb.*;
   					

4. Add the following code in the Button1_Click event:

        try
        {
             OleDbConnection cnOra 
                        = new OleDbConnection
                           ("Provider=Provider;Data Source=Server;" 
                  + "user id=User;password=Password;"
                  + "persist security info=false;");
   
             OleDbCommand cmdPerson 
                        = new OleDbCommand
                           ("{call PackPerson.allPerson"
                           + "({resultset 3, ssn, fname, lname})}", cnOra);
   
             OleDbDataAdapter daPerson 
                        = new OleDbDataAdapter(cmdPerson);
   
             cnOra.Open();
   
             DataSet ds = new DataSet();
   
             daPerson.Fill(ds, "Person");
   
                   dataGrid1.set_DataSource
                        (ds.get_Tables().get_Item("Person"));
        }
        catch (Exception error)
        {
             MessageBox.Show ("Error = " + error);
        }
           finally
           {
                   cnOra.Close();
           }
   					

5. Modify the OleDbConnection string as appropriate for your environment:

   OleDbConnection cnOra
      = new OleDbConnection
         ("Provider=Provider;Data Source=Server;"
         + "user id=User;password=Password;"
         + "persist security info=false;");

6. Press F5 to build and then run the program.
7. Click Button1. The results appear in the DataGrid control.

NOTE: You must use an Oracle version 8.x server to run the program. Only Oracle 8.0 and later support retrieving result sets and running stored procedures.

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