WPF中SqlHelper

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
namespace 数据绑定
{
    class SqlHelper
    {
        private static string strconn= ConfigurationManager.ConnectionStrings["dbstrConn"].ConnectionString;
        public static int ExecuteNonQuery(string sql)
        {
            using (SqlConnection conn = new SqlConnection(strconn))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = sql;
                    return cmd.ExecuteNonQuery();
                }

            }
        }
        public static object ExecuteScalar(string sql)
        {
            using (SqlConnection conn = new SqlConnection(strconn))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = sql;
                    return cmd.ExecuteScalar();
                }

            }
        }
        //查询少量数据
        public static DataTable ExecuteTable(string sql)
        {
            using (SqlConnection conn = new SqlConnection(strconn))
            {
                conn.Open();
                using (SqlCommand cmd = conn.CreateCommand())
                {
                    cmd.CommandText = sql;
                    SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                    DataSet dataset = new DataSet();
                    adapter.Fill(dataset);
                    return dataset.Tables[0];
                }

            }
        }
    }
}