ASP.NET PDF Viewer using C#, VB/NET

Now that we have a JPublisher-generated class for the object type in the database, we need to tell the JDBC driver which object type maps to which Java class. We provide this information to the driver by adding a type map to the Connection object. The type map for a connection is an object that implements the java.util.Map interface (similar to how java.util.HashMap does). It contains a key/value pair, with the database object name as the key and the class object of the corresponding custom class as the value. To add to the type map the mapping between the object type and the custom class, we need to first get the existing map, if any, from the Connection object using the following method of the Connection object: public Map getTypeMap() throws SQLException

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The command wrapper is a helper type for a Command object in a Managed Provider. It s created for you by a database object and automatically populates several properties of the wrapped Command. There are two main factory methods for retrieving an instance of a command wrapper (see Table 11-7). Table 11-7. Factory Methods for Command Wrapper Objects

This method retrieves the Map object associated with a Connection object. Unless the application has added an entry, the type map returned will be empty. An example illustrating invocation of this method is Map map = connection.getTypeMap(); Next, we need to add the entries to the Connection object s Map object. In this example, we map the Java class instance of the class MyAddress to the database object type address as follows: myMap.put ( "BENCHMARK.ADDRESS", Class.forName( MyAddress.class.getName() ) ); We can set a Map object (containing the requisite mapping entries) on the Connection object by using the following method: public void setTypeMap( Map typeMap) throws SQLException For example, we can execute the following code: connection.setType ( myMap );

The final topics we cover in this chapter are F# quotations, which provide a way to get at a representation of F# expressions as abstract syntax trees, and reflection, which lets you get at representations of assemblies, type definitions, and member signatures. Let s look at reflection first.

In this section, we ll go through the steps of selecting, inserting, updating, or deleting objects using the custom classes generated in the previous section. The class DemoSQLData illustrates these steps for us and is explained in comments interspersed within the code: /** This program demonstrates how to use the Java class * MyAddress that maps to the address object type and uses * the JDBC standard interface SQLData. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. and */ 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.MyAddress; public class DemoSQLData { public static void main(String[] args) throws Exception { Connection connection = null; try { connection = JDBCUtil.getConnection( "benchmark", "benchmark", "ora10g" );

One of the simplest uses of reflection is to access the representation of types and generic type variables using the typeof operator. For example, typeof<int> and typeof<'a> are both expressions that generate values of type System.Type. Given a System.Type value, you can use the .NET APIs to access the System.Reflection.Assembly value that represents the .NET assembly that contains the definition of the type (.NET assemblies are described in 7). You can also access other types in the System.Reflection namespace such as MethodInfo, PropertyInfo, MemberInfo, and ConstructorInfo. For example, here we examine the names associated with some common types: > let intType = typeof<int>;; val intType : System.Type > intType.FullName;; val it : string = "System.Int32" > intType.AssemblyQualifiedName;; val it : string = "System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" > let intListType = typeof<int list>;; val intListType : System.Type > intListType.FullName;; val it : string = "Microsoft.FSharp.Collections.List`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"

Creates a wrapper configured for CommandType of Text. Creates a wrapper configured for stored procedure execution.