自定义t4模版，根据数据库生成实体模型

Template文件

<#@ assembly name="Microsoft.SqlServer.ConnectionInfo" #>
<#@ assembly name="Microsoft.SqlServer.Smo" #>
<#@ assembly name="Microsoft.SqlServer.Management.Sdk.Sfc" #>
<#@ import namespace="System" #>
<#@ import namespace="Microsoft.SqlServer.Management.Smo" #>

<#+
public class ProcedureTemplate : Template
{
    public string DatabaseName {get; private set;}
	public string TableName{get;private set;}
	public Table Table {get; private set;}
	
	public const string VersionNoField 			= "VERSION_NO";
	public const string VersionNoParameterName 	= "@p_version_no";
	
	public ProcedureTemplate(string databaseName, string tableName)
	{
		this.DatabaseName 	= databaseName;
		this.TableName = tableName;
	}
	
	public virtual string GetProcedureName()
	{
		return this.TableName + "M";	
	}

    public override string TransformText()
    { 
		Server server = new Server();
        Database database = new Database(server, DatabaseName);
        var table = new Table(database, TableName);
        table.Refresh();
		WriteLine("using System;");
		WriteLine("using System.Runtime.Serialization;");
		WriteLine("namespace RTMDemo.Model");
		WriteLine("{");
		PushIndent("\t");
		WriteLine("[DataContract]");
		WriteLine("public class {0}M",TableName);
		WriteLine("{");
		PushIndent("\t");
		for(int i=0; i<table.Columns.Count;i++)
		{
			Column column = table.Columns[i];
			if(column.Name != VersionNoField)
			{
				WriteLine("[DataMember]");
				WriteLine("public Guid {0};",column.Name);
			}			
		}
		PopIndent();
		WriteLine("}");
		PopIndent();
		WriteLine("}");
        return this.GenerationEnvironment.ToString();
    }
}
#>

Generator

<#@ import namespace="System.Collections.Generic" #>
<#@ include file="ProcedureTemplate.tt" #>
<#@ include file="T4Toolbox.tt" #>
<#+
public class ProcedureGenerator : Generator
{
    public List<ProcedureTemplate> Templates{get; private set;}
  
  	public ProcedureGenerator(string databaseName, params string[] tableNames)
	{
		if(null == tableNames || tableNames.Length == 0)
		{
			throw new ArgumentNullException("数据表名有误");
		}	
		Templates = new List<ProcedureTemplate>();
		foreach(string tableName in tableNames)
		{			
			var t = new ProcedureTemplate(databaseName, tableName);
			Templates.Add(t);
		}
	}
	
	protected override void RunCore()
	{
		foreach(ProcedureTemplate tempalte in this.Templates)
		{
			tempalte.RenderToFile(tempalte.GetProcedureName() + ".cs");
		}
    }
}
#>

生成器

<#@ template language="C#" hostSpecific="true" debug="true" #>
<#@ include file="ProcedureGenerator.tt" #>
<#
   var tableNames = new string[]{"aa","bb"};
   new ProcedureGenerator("testDb",tableNames).Run();
#>

此文参考了artech的文章

http://www.cnblogs.com/artech/archive/2010/11/17/CodeGeneration.html