.NET/Java PDF, Tiff, Barcode SDK Library

Invariably, work must be done transactionally. You have many ways to do many types of transactions. We limit our discussion here to what you can accomplish with the Data Access Application Block, which is a transaction on a single connection to a single data store. The block leverages the transaction capabilities built into the Managed Providers. The transaction model in the block is very simple. Many of the ExecuteXYZ methods you ve already examined have a different overloaded method footprint that accepts an instance of an IDBTransaction instance. When this is present, the work is done in a transaction. This interface exposes the Commit and Rollback methods, which determine the fate of the work that s been done in the transaction. Transactions are created by another factory method of the Database object. Let s have a look. Here you ll increase royalty paid to authors from the pubs database by 10 percent (a very fine idea indeed). First you ll update the royalty schedule. You ll then need to cascade this update to the titles table, where royalty (in a gross denormalization of the pubs schema) is carried as well. If this cascade update fails, you ll need to roll back the initial update of the royalty amounts. private void UpdateRoyalties() { Database db = DatabaseFactory.CreateDatabase(); IDbConnection cn = db.GetConnection(); string sql1 = "update roysched set royalty = royalty * 1.1"; string sql2 = "update titles set titles.royalty = roysched.royalty " + "FROM roysched INNER JOIN " + "titles ON roysched.title_id = titles.title_id"; DBCommandWrapper cwRoyal = db.GetSqlStringCommandWrapper(sql1); DBCommandWrapper cwTitle = db.GetSqlStringCommandWrapper(sql2);

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/*@lineinfo:user-code*//*@lineinfo:140^5*/ return __jPt_result; } }/*@lineinfo:generated-code*/ Notice that the generated AddressAuto class code has additional code that employs SQLJ to get the connection information. It uses this connection to invoke the method get_address() of the object type address in the generated wrapper method getAddress(). The second generated Java file for the class MyAddressAuto (edited for clarity) is as follows: /*@lineinfo:filename=MyAddressAuto*//*@lineinfo:user-code*//*@lineinfo:1^1*/ package book.ch10.jpub; /* Some other imports deleted for clarity */ import oracle.jpub.runtime.MutableStruct; import sqlj.runtime.ref.DefaultContext; import sqlj.runtime.ConnectionContext; public class MyAddressAuto extends AddressAuto implements SQLData { public MyAddressAuto() { super(); } /* superclass accessors */ /* Code for accessor methods (setter and getter of various attributes) are generated within comments by JPublisher these have been deleted for clarity */ /* superclass methods */ public String getAddress() throws SQLException { String __jRt_0 = null;

Beyond the HTML and ASP.NET controls, the key code in Listing 14-2 is the embedded F# script beginning with <script language="F#" runat="server">. F# scripts embedded in .aspx pages must be a set of member declarations, in other words, fragments of an F# type definition. ASP.NET inserts these into the code generated for the page object. The embedded F# script contains two members. The first is as follows: member this.Form1_Load(sender: obj, e: EventArgs) = if not this.Page.IsPostBack then this.Time.Text <- DateTime.Now.ToString() This member is associated with the Form1 control and is invoked on the server when the page is loaded, in other words, as part of the process of generating the final HTML for the page. We can see this because the event callback for the control mentions this event handler:

__jRt_0 = super.getAddress(); return __jRt_0; } }/*@lineinfo:generated-code*/} Note that the class now contains the getAddress() method, which is the wrapper equivalent of the get_address() method of the object type address. The following listing presents the class DemoAddressAuto, which illustrates how to use the generated wrapper method: /** This program demonstrates how to use the Java class * MyAddressAuto that maps to the address object type with * its wrapper method generated automatically with * JPublisher. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. and 9.2.0.1.0. */ import java.util.Map; import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import book.util.JDBCUtil; import book.ch10.jpub.MyAddressAuto; public class DemoSQLDataAuto { public static void main(String[] args) throws Exception { Connection connection = null; PreparedStatement pstmt = null; // select ResultSet rset = null; try { connection = JDBCUtil.getConnection ( "benchmark", "benchmark", "ora10g" ); Map myMap = connection.getTypeMap(); myMap.put ( "BENCHMARK.ADDRESS", Class.forName("book.ch10.jpub.MyAddressAuto") ); // select the object and invoke the wrapper method String selectStmt = "select value(a) from address_table a"; pstmt = connection.prepareStatement ( selectStmt ); rset = pstmt.executeQuery(); while ( rset.next() ) { MyAddressAuto address = (MyAddressAuto) rset.getObject(1);