关于SqlDataAdapter的几个Command属性的疑问

Question

http://topic.csdn.net/u/20071119/17/9316fdc5-5993-4720-a8e7-0d4ab5e28528.html 
上面的问题就是我碰到的

我想操作的是利用SqlDataAdapter的几个Command属性(InsertCommand,UpdateCommand,DeleteCommand)来更新数据库
代码:
SqlConnection conn = new SqlConnection(@"Data Source=.\sqlexpress;Initial Catalog=newsystem;Integrated Security=True");
  SqlDataAdapter da = new SqlDataAdapter("select * from comment", conn);
  //这里的构造函数直接实例化了SelectCommand所需要的SqlCommand了吧?
  DataSet ds = new DataSet("myds");
  da.FillSchema(ds, SchemaType.Source, "comment");
  da.Fill(ds, "comment");
  //接下来设置InsertCommand所需要的SqlCommand
SqlCommand incmd=new SqlCommand("insert into comment (****) values(****)",conn);
  da.InsertCommand = incmd;
  //接下来是更新到数据库
  da.Update(ds.Tables["comment"]);
  ds.Tables["comment"].AcceptChanges();
  可到数据库里一看,悲剧发生了:没有插入该条记录!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

网上一查:有些说要实例化SqlCommandBuilder,可我觉得我的InsertCommand所需要的SqlCommand都写好了,不需要这样吧！
SqlCommandBuilder好像只是适用于直接修改DataSet,由SqlCommandBuilder自动生成所需的SQL语句:
  SqlConnection conn = new SqlConnection(@"Data Source=.\sqlexpress;Initial Catalog=newsystem;Integrated Security=True");
  SqlDataAdapter da = new SqlDataAdapter("select * from comment", conn);
  SqlCommandBuilder cmdb = new SqlCommandBuilder(da);
  DataSet ds = new DataSet("myds");
  da.FillSchema(ds, SchemaType.Source, "comment");
  da.Fill(ds, "comment");
  ds.Tables["comment"].Rows[5]["content"] = "Can you help me???";
  da.Update(ds.Tables["comment"]);
  ds.Tables["comment"].AcceptChanges();

Answer 1

public static SqlDataAdapter CreateCustomerAdapter( SqlConnection connection) { SqlDataAdapter adapter = new SqlDataAdapter(); // Create the SelectCommand. SqlCommand command = new SqlCommand("SELECT * FROM Customers " + "WHERE Country = @Country AND City = @City", connection); // Add the parameters for the SelectCommand. command.Parameters.Add("@Country", SqlDbType.NVarChar, 15); command.Parameters.Add("@City", SqlDbType.NVarChar, 15); adapter.SelectCommand = command; // Create the InsertCommand. command = new SqlCommand( "INSERT INTO Customers (CustomerID, CompanyName) " + "VALUES (@CustomerID, @CompanyName)", connection); // Add the parameters for the InsertCommand. command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID"); command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName"); adapter.InsertCommand = command; // Create the UpdateCommand. command = new SqlCommand( "UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " + "WHERE CustomerID = @oldCustomerID", connection); // Add the parameters for the UpdateCommand. command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID"); command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName"); SqlParameter parameter = command.Parameters.Add( "@oldCustomerID", SqlDbType.NChar, 5, "CustomerID"); parameter.SourceVersion = DataRowVersion.Original; adapter.UpdateCommand = command; // Create the DeleteCommand. command = new SqlCommand( "DELETE FROM Customers WHERE CustomerID = @CustomerID", connection); // Add the parameters for the DeleteCommand. parameter = command.Parameters.Add( "@CustomerID", SqlDbType.NChar, 5, "CustomerID"); parameter.SourceVersion = DataRowVersion.Original; adapter.DeleteCommand = command; return adapter; }