在C#中使用存储过程

Question

我正在使用C#编写数据库应用程序.我需要在表格上显示数据,现在我已经完成了.但我的业务逻辑硬编码到我的代码.现在我想继续使用我的代码存储过程.我需要做哪些修改.一个简单的步骤列表就够了:)

SqlConnection myConnection = new SqlConnection("user id=dbblabla;" + 
            "password=1234;server=localhost\\SQLEXPRESS;" + 
            "Trusted_Connection=yes;" + 
            "database=myDB; " + 
            "connection timeout=30");

try
{
    myConnection.Open();
} catch (SqlException excep){
    Console.WriteLine(excep.StackTrace);
}

String selectionQuery = "SELECT * FROM myTable";
SqlDataAdapter myAdapter = new SqlDataAdapter(selectionQuery,myConnection);

DataSet ds = new DataSet();
myAdapter.Fill(ds,"AllInfo");

dataGridSearchOutput.DataSource = ds.Tables["AllInfo"].DefaultView;

我从创建一个新的SQL命令开始,但我不确定我使用的是正确的方法.

SqlCommand newCommand = new SqlCommand("SELECT * FROM PMInfo");
newCommand.CommandType = CommandType.StoredProcedure;

Answer 1

存储过程

CREATE PROCEDURE addemp
     @eno int,
     @ename varchar(50),
     @edate datetime
AS
  declare @p int

  select @p=count(*) from emp
      where eno=@eno
  if @p=0
     begin
       insert into emp
         values (@eno,@ename,@edate)
     end        
    RETURN

C#代码

    SqlConnection cn = new SqlConnection(@"conn_str");
    SqlCommand cmd = new SqlCommand("addemp", cn);
    cmd.CommandType = CommandType.StoredProcedure;

    cmd.Parameters.AddWithValue("@eno", 10);
    cmd.Parameters.AddWithValue("@ename", "Mr.Xyz");
    cmd.Parameters.AddWithValue("@edate", DateTime.Parse("1-1-2002"));

    cn.Open();
    cmd.ExecuteNonQuery();
    cn.Close();

Answer 2

存储过程

CREATE PROCEDURE  procedure 

AS
BEGIN

    SET NOCOUNT ON;
    SELECT field1,field2 from tbl
END
GO

码

using(SqlConnection con = new SqlConnection("user id=dbblabla;password=1234;server=localhost\\SQLEXPRESS; database=myDB; connection timeout=30"))
        {
            SqlCommand cmd = new SqlCommand("procedure",con);
            cmd.CommandType= System.Data.CommandType.StoredProcedure;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridSearchOutput.DataSource = dt;           

        }

我使用的原因是检查此链接