.NET/ASP.NET/C#/VB.NET PDF Document SDK

managerRef = rset.getRef( 1 ); } return managerRef; } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } } The method _updateEmployeeRef() takes the selected reference object and performs the actual update: private static void _updateEmployeeRef( Connection conn, int empNo, Ref newManagerRef ) throws SQLException { The statement string for the update simply sets the reference column manager to the passed value. Later, we use the method setRef() of the PreparedStatement interface to carry out the actual update. In this case, we effectively change the data so that Jack reports directly to Larry instead of reporting to John (a huge promotion, considering Larry is the CEO!). String updateStmtString = "update emp_table_with_ref e" + " set e.manager = " + " where e.emp_no = "; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( updateStmtString pstmt.setRef( 1, newManagerRef ); pstmt.setInt( 2, empNo ); pstmt.execute(); } finally { JDBCUtil.close( pstmt); } } } // end of program That wraps up our discussion of weakly typed Ref objects. In the next section, we look at how to use custom reference classes to query and update references.

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<Table> <EmpID>1003</EmpID> <FirstName>Eve</FirstName> <LastName>Smith</LastName> <Birthday>2007-09-27T00:00:00+01:00</Birthday> </Table> </NewDataSet> or to write it to a file: > System.IO.File.WriteAllText(file "employees.xml", employeesTable.GetXml());; val it : unit = ()

As you may have guessed by now, we will use the JPublisher utility (see 7 for details on how to use this utility) to generate the custom classes for our reference objects. A custom reference class must satisfy the following requirements: It must implement the oracle.sql.ORAData and oracle.sql.ORADataFactory interfaces. It must provide a way to refer to the underlying object s data (JPublisher does this by using an underlying REF attribute). As in the case of collection classes, the standard SQLData interface supports only SQL object mappings; it does not support mappings for reference objects. Thus, if you instruct JPublisher to implement the standard SQLData interface in creating a custom object class, it will not generate a custom reference class. You must use the ORAData implementation for this purpose.

These are the questions that keep you awake at night, at your desk, going over your solution one more time After you ve established the technical requirements of the application, you must map these requirements to the technologies at your disposal, have them drive the adoption of logical tiers in the design, and then decide how to physically deploy these logical tiers You ll need to address many questions in this process: What servers and services will be used at what tiers of the application How will the data be accessed How will requests be marshaled between the logical layers of the application What about when those layers span processes or span machines In this book, we provide a complete traversal of this call stack in the context of a NET application.

Stored procedures are defined and stored in your relational database and provide a number of benefits over literal SQL. First, they are external to the application and thus provide a clear division of the data logic from the rest of the application. This enables you to make data-related modifications without having to change application code or having to redeploy the application. Second, they are stored in the database in a prepared or compiled form and thus are executed more efficiently than literal SQL statements (although those can be prepared as well at a onetime cost, but they are still contained in application space, which is undesirable). Supplying arguments to stored procedures simply instantiates the compiled formula. In Visual Studio, you can add stored procedures just like any other database artifacts using the Server Explorer window by right-clicking the Stored Procedures item in the appropriate database and selecting Add New Stored Procedure. This creates a stored procedure template that can be easily customized. Alternatively, you can add stored procedures programmatically using the CREATE PROCEDURE SQL command. Consider the following stored procedure that returns the first and last names of all employees whose last name matches the given pattern: execNonQuery conn " CREATE PROCEDURE dbo.GetEmployeesByLastName ( @Name nvarchar(50) ) AS SELECT Employees.FirstName, Employees.LastName FROM Employees WHERE Employees.LastName LIKE @Name" We can wrap this stored procedure in a function as follows: let GetEmployeesByLastName (name: string) = use comm = new SqlCommand("GetEmployeesByLastName", conn, CommandType=CommandType.StoredProcedure)