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Using Oracle Packages

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Using Oracle Packages

This topic discusses the use of Oracle Packages. Oracle does not support directly returning row sets from stored procedures; however, this functionality is possible using Oracle Packages.

About Oracle Packages

In the past most Oracle Server databases contained only a small amount of code in stored procedures but, today, this is rapidly changing. Oracle Packages serve as a way to group stored procedures and functions together, typically based upon their common role. Benefits include better performance, code isolation, and the close coupling of data with behavior.

Logi reporting products support calls to Oracle Package procedures using DataLayer.SQL, Procedure.SQL, DataLayer.SP, and Procedure.SP elements.

When working with Oracle, you will need to ensure that you have the correct Oracle Provider (if using OLEDB) or the Oracle Client (if using ODBC) installed on the web server.

Writing Oracle Packages and Procedures

Oracle stored procedures can perform non-query activities such as INSERTs, UPDATEs, and DELETEs that do not necessarily return data.

However, in order for a stored procedure that does return data to work with Logi applications, it must return a valid result set, such as the output from a SELECT statement; data cannot be returned as individual values in output parameters. The package and procedure should be similar to this example, which returns a list of UserIDs from a table in the database :

      PACKAGE LGX_GET_DATA
      AS
      TYPE UserCur IS REF CURSOR;
      PROCEDURE AllUser(o_EmpCursor OUT UserCur);
      END LGX_GET_DATA;

      PACKAGE BODY "LGX_GET_DATA"
      AS
      PROCEDURE AllUser(o_EmpCursor OUT UserCur)
      AS
      BEGIN
      OPEN o_EmpCursor FOR
      SELECT USER_ID
      FROM USER_ACCOUNTS
      ORDER BY USER_ID;
      END AllUser;
      END LGX_GET_DATA;

Your stored procedure can have any number of input parameters but it can have only one output cursor. In addition, the output cursor must be last in your procedure's argument list. For example, this will work

    procedure X( iParam1 in integer, iParam2 in integer, ..., o_cur out ioCursor )

but this will not:

    procedure X( o_cur out ioCursor, iParam1 in integer, iParam2 in integer, .... )

The Oracle Connection String

The Connection String for an Oracle database requires a special parameter that you must code manually.
 

Add the following parameter, highlighted above, to your Connection element's Connection String attribute: 

       PLSQLRSet=1

This informs the OLEDB provider that row sets can be returned (in the example above, an OLEDB provider supplied by Oracle has been installed and is used).

Check here to see examples of Oracle connection strings for a variety of configurations and circumstances. All must include the parameter shown above in order to return row sets.

Using DataLayer.SQL or Procedure.SQL Elements 

Although they're generally not used with stored procedures, the DataLayer.SQL and Procedure.SQL elements provide an easy way to call a stored procedure in an Oracle Package.
 

As shown above, if you use the DataLayer.SQL or Procedure.SQL elements, their Source attribute should contain a command with the following syntax:

    {call PackageName.ProcedureName('StringValue',NumericValue,...)}

The data in the returned row set is referenced using @Data tokens as usual.

Usage Example: imagine that a stored procedure named MyProc has been included an Oracle Package named MyPackage. The stored procedure requires two parameters: one a string and the other a number.

To use the stored procedure, the DataLayer element's Source attribute should contain:

    {call MyPackage.MyProc('George',100)} 

If you want to call this stored procedure with variable arguments using token, the Source attribute should contain:

    {call MyPackage.MyProc('@Request.FirstName~',@Request.Count~)}

Using DataLayer.SP or Procedure.SP Elements

The Logi Studio elements designed to be used with stored procedures, DataLayer.SP and Procedure.SP can be used to retrieve data from an Oracle Package procedure. However, they behave slightly differently than they do in other circumstances.


     

The DataLayer.SP or Procedure.SP element's Command attribute uses a particular syntax, shown above, to identify the Oracle Package and Procedure. This is <packageName>.<procedureName>.

As shown above, set the SP Parameters element's Null Value attribute to NULL.

You may use as many input parameters in your definition as you wish but do not use any output parameters. The data in the returned row set is referenced using @Data tokens as usual.

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