.NET/Java PDF, Tiff, Barcode SDK Library

You can refer to each column of a row by the same field name that was used in the SELECT query. Adding a new row to table is treated similarly: let row = table.NewRow() row.Item("EmpID") <- 1003 row.Item("FirstName") <- "Eve" row.Item("LastName") <- "Smith" row.Item("Birthday") <- System.DateTime.Today table.Rows.Add row dataAdapter.Update(dataSet) |> ignore // ignore the number of affected rows Repeating the SQL query from the previous section reveals the addition of the new entry to the database table: > query();; val it : seq<string * System.DateTime> = seq [("Joe", 14/02/1965 00:00:00); ("Mary", 15/09/1985 00:00:00); ("Eve", 27/09/2007 00:00:00)] Note that we utilize the INSERT statement that was built by the command builder object based on the selection query. Using untyped datasets is a great way to execute dynamic queries and to provide ad hoc access to your data. On the other hand, the lack of strong typing means that it suffers from possible type mismatches or incorrect field names.

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The program DemoQueryAndUpdateUsingWeaklyTypedRefs demonstrates how to query or update reference objects from JDBC. The program begins with the import statements and obtaining the connection in the main() method as follows: /** This program demonstrates how to * 1. query a ref object * 2. dereference it to get its value * 3. update its value and store it back in the database * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.SQLException; import java.sql.Connection;

There are a lot of things you can break by doing this, but with careful planning, dynamically choosing a handler at runtime can be a powerful means to provide context- or user-specific handling of requests that are completely in your control Another example is to create instances of User Controls depending on user preferences or authorizations, cast the handler into a known page type that exposes those User Controls as properties, and dynamically create instances of the appropriate controls and assign them to the properties Keep in mind that this all occurs before any Page specific code is ever executed The exception, of course, is the constructor, which has to be fired when the handler is first instantiated Move initialization code from your constructor to the Page Init method override, and you can avoid issues that might otherwise arise At this point the HttpApplication code calls ProcessRequest on the handler.

Typed datasets are derived from ordinary datasets and allow you to work with data in a typesafe manner. This means that instead of (row.Item "FirstName" : > string), you can simply write row.FirstName. Typed datasets can be created using the xsd.exe command-line tool included in the .NET SDK. This tool generates source code from XML schema documents, so to use it you must obtain an XSD document for the tables you want data objects for. (You can quickly generate an XML schema document using Visual Studio; select File New File XML Schema, and drag the needed data tables onto the design canvas.) Alternatively, we can extract this schema definition using code: open System.IO let dataSet2 = buildDataSet conn "SELECT * FROM Employees" let file name = Path.Combine(@"c:\fsharp", name) do File.WriteAllText(file "employees.xsd", dataSet2.GetXmlSchema()) Using this extracted XSD document, we can now fire up xsd.exe from the command-line shell:

import java.sql.PreparedStatement; import java.sql.Ref; import java.sql.ResultSet; import oracle.sql.STRUCT; import book.util.JDBCUtil; import book.util.Util; class DemoQueryAndUpdateUsingWeaklyTypedRefs { public static void main(String args[]) throws SQLException { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); The method _doSelectRef() demonstrates how to select a Ref object: _doSelectRef( conn ); The method _doUpdateRef() demonstrates how to update a Ref object so that it points to a different row after the update: _doUpdateRef( conn ); } finally { // release resources associated with JDBC // in the finally clause. JDBCUtil.close( conn ); } } Querying a Ref Object The method _doSelectRef() is defined as follows: private static void _doSelectRef( Connection conn ) throws SQLException { We define a query statement that selects all columns of the table emp_table_with_ref including the reference column manager: String stmtString = "select e.emp_no, e.name, e.manager" + " from emp_table_with_ref e"; PreparedStatement pstmt = null; ResultSet rset = null; try {

We ll talk about custom handlers shortly The Page handler has a well-known life cycle Init is called The Load event is fired Control-specific events are fired, the Pre-Render event fires, and then the Unload event fires (We examine this life cycle very closely in 3) After the Page handler executes and renders, processing returns to the HttpApplication pipeline The next event in this pipeline is PostRequestHandlerExecute You can use PreRequestHandlerExecute and PostRequestHandlerExecute in pairs to box in the lifetime of a resource over the lifetime of the Page object When communicating with the Page object, remember to use interfaces to avoid tight couplings between specific instances of Page objects and your more general pre- and post-processing code.