.net_orm_grove的学习（一）

    利用Grove Tool Kit 连接NorthWind 并生成Customers、Orders、Employees实体类

1、ObjectOperator
    
      //实例化ObjectOperator类
      string conn=System.Configuration.ConfigurationSettings.AppSettings["strconnection"];
      Grove.ORM.ObjectOperator obj=new ObjectOperator(conn);

Method	Description
Insert	Insert an object into the data source
Update	Update an object
Remove	Delete an object from the data source
RemoveChilds	Delete child objects
Retrieve	Returns an object from the data source
RetrieveChilds	Returns child objects from the data source
GetDataReader	Returns an IDataReader from the data source
GetObjectSet	Returns a collection of object values
GetObjectSource	Returns a DataSet which contain the data source of the object
GetCount	Returns a records count of the data source
BeginTranscation	Begins a transaction at the data source, if transactions are supported by the data source.
Commit	Commits the current transaction.
Rollback	Rolls back the current transaction.

2、ObjectQuery 类

      //实例化ObjectQuery ,返回对象的所有记录集
      ObjectQuery  query = new ObjectQuery (typeof(Customer),"");

 3、返回DataSet 数据集

        Grove.ORM.ObjectOperator obj=new ObjectOperator(conn);
        Grove.ORM.ObjectQuery query = new ObjectQuery (typeof(Customers),"");
        DataSet ds = obj.GetObjectSource(query);

4、返回ArrayList集合

       Grove.ORM.ObjectOperator obj=new ObjectOperator(conn);
       Grove.ORM.ObjectQuery query = new ObjectQuery (typeof(Customers),"");
       ArrayList al = obj.GetObjectSet(query);

5、返回IDataReader

      Grove.ORM.ObjectOperator obj=new ObjectOperator(conn);
      Grove.ORM.ObjectQuery query = new ObjectQuery (typeof(Customers),"");
      IDataReader dr = obj.GetDataReader(query);