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

In many cases, the required procedural logic isn t implemented within the database at all. Instead, it is placed within a .NET middle-tier component. This approach frees the SQL Server process to concentrate on what it does best: process sets of data. It also enables the .NET developer to leverage the rich procedural and object-oriented features of any managed .NET language and the full set of functionality provided by the .NET Framework classes. The downside to this approach, however, is that it results in more data marshaling costs as the data must be moved out of the SQL Server process and into the middle-tier component and vice versa.

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We use the properties file prop_address_oradata.txt, the contents of which follow: jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=oracle jpub.package=book.ch10.jpub jpub.input=input_address_oradata.txt Notice the use of jpub.usertypes=oracle here this is the change in option that directs JPublisher to generate custom classes that implement the proprietary interfaces ORAData and ORADataFactory. Next, we run the JPublisher command that uses the preceding properties file: jpub -props=prop_address_oradata.txt The following class files are generated in our directory: AddressORAData.java: The parent class extended by the MyAddressORAData class. MyAddressORAData.java: The child class mapped to the address object type. This is the class we should modify if required. MyAddressORADataRef.java: This represents a reference object. Notice that apart from the two classes AddressORAData and MyAddressORAData that we specified, we also get a third class, MyAddressORADataRef. When using Oracle proprietary interfaces, JPublisher automatically generates a class that represents a reference to the database object type, in case we need to use it. For the time being, we will ignore the third class; we ll look at references to object types in the next chapter. The following listing shows the content of the generated AddressORAData.java file (edited for clarity): /*@lineinfo:filename=AddressORAData*//*@lineinfo:user-code*//*@lineinfo:1^1*/ package book.ch10.jpub; /* All imports deleted for clarity */ public class AddressORAData implements ORAData, ORADataFactory { public static final String _SQL_NAME = "BENCHMARK.ADDRESS"; public static final int _SQL_TYPECODE = OracleTypes.STRUCT; /* connection management */ protected DefaultContext __tx = null; protected Connection __onn = null; public void setConnectionContext(DefaultContext ctx) throws SQLException { release(); __tx = ctx; } public DefaultContext getConnectionContext() throws SQLException

Listing 14-3. web.config: An ASP.NET Website Configuration File for Listing 14-2 < xml version="1.0" > <configuration> <system.web> <compilation debug="true" /> </system.web> <system.codedom> <compilers> <compiler language="F#;f#;fs;fsharp" extension=".fs" type="Microsoft.FSharp.Compiler.CodeDom.FSharpAspNetCodeProvider, FSharp.Compiler.CodeDom, Version=1.9.2.9, Culture=neutral, PublicKeyToken=a19089b1c74d0809"/> </compilers> </system.codedom> </configuration>

{ if (__tx==null) { __tx = (__onn==null) DefaultContext.getDefaultContext() : new DefaultContext(__onn); } return __tx; }; public Connection getConnection() throws SQLException { return (__onn==null) ((__tx==null) null : __tx.getConnection()) : __onn; } public void release() throws SQLException { if (__tx!=null && __onn!=null) __tx.close( ConnectionContext.KEEP_CONNECTION); __onn = null; __tx = null; } protected MutableStruct _struct; private static int[] _sqlType = { 12,12,12,12,12,12 }; private static ORADataFactory[] _factory = new ORADataFactory[6]; protected static final AddressORAData _AddressORADataFactory = new AddressORAData(); public static ORADataFactory getORADataFactory() { return _AddressORADataFactory; } protected static java.util.Hashtable _map = new java.util.Hashtable(); protected static boolean _initialized = false; protected static synchronized void init() { if (!_initialized) { _initialized=true; _map.put("BENCHMARK.ADDRESS", book.ch10.jpub.MyAddressORAData.getORADataFactory()); } } /* constructors */ protected void _init_struct(boolean init) { if (init) _struct = new MutableStruct(new Object[6], _sqlType, _factory); } public AddressORAData() { _init_struct(true); __tx = DefaultContext.getDefaultContext(); } public AddressORAData(DefaultContext c) /*throws SQLException*/ { _init_struct(true); __tx = c; } public AddressORAData(Connection c) /*throws SQLException*/ { _init_struct(true); __onn = c; } public AddressORAData(String line1, String line2, String street, String city, String state, String zip) throws SQLException {

Before CLR Integration, the state of database programming was less than ideal T-SQL works great for set-oriented tasks, but it is difficult to work with and slow for procedural tasks NET languages can provide the necessary procedural logic, but only at the expense of marshaling the data in and out of the SQL Server database CLR Integration provides an elegant solution to this problem SQL Server 2005 can host the CLR and, therefore, can execute managed code in process This provides the following benefits: Instead of struggling with the limited procedural constructs of T-SQL, database developers can take advantage of all the capabilities of a managed NET language such as C# or VB NET These languages provide modern procedural and object-oriented features, making it much easier to develop and reuse complex procedural logic The JIT compilation scheme these languages employ also performs much better than T-SQL interpretation.