本地测试Sql

数据库sqlserver2008

编程vs2008,C#

该测试是数据库和程序在一台计算机上，如果不在一台计算机上就不一样了

我的数据库最大链接是127，好像不固定。

一、测试链接对速度的影响

static void RunSql()
        {
            DateTime datetime1 = DateTime.Now;
            for (int i = 0; i < 1000; i++)
            {
                SqlHelper.ExSql();  
            }
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);
        }

1、初始化，打开，操作，关闭

public static void ExSql()
        {
            conn = new SqlConnection(connstr);
            string sqlstr1 = "INSERT INTO [dbo].[T2]([C2])VALUES('a')";
            SqlCommand cmd1 = new SqlCommand(sqlstr1, conn);
            conn.Open();
            cmd1.ExecuteNonQuery();
            conn.Close();
        }

2、打开，操作，关闭

3、操作

总结：1000个周期，节省了100ms，没多大区别

二、SqlDataAdapter打开前和打开后的状态

1、开始是打开状态

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            conn.Open();
            SqlDataAdapter da = new SqlDataAdapter(sqlstr,conn);
            Console.WriteLine(conn.State.ToString());
            DataTable dt=new DataTable();
            da.Fill(dt);
            Console.WriteLine(conn.State.ToString());
            
        }

2、开始是关闭状态

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            conn.Open();
            conn.Close();
            SqlDataAdapter da = new SqlDataAdapter(sqlstr,conn);
            Console.WriteLine(conn.State.ToString());
            DataTable dt=new DataTable();
            da.Fill(dt);
            Console.WriteLine(conn.State.ToString());
            
        }

总结：SqlDataAdapter.Fill()执行后的状态由执行前的状态决定

三、SqlDataAdapter和SqlDataReader的速度

1、SqlDataAdapter

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            SqlDataAdapter da = new SqlDataAdapter(sqlstr,conn);          
            DataTable dt=new DataTable();
            da.Fill(dt);
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);            
        }

2、SqlDataReader填充表

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            DataTable dt = new DataTable();
            SqlCommand cmd=new SqlCommand(sqlstr,conn);
            dt.Columns.Add("c1",typeof(int));
            dt.Columns.Add("c2",typeof(string));
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                object[] values = new object[2];
                reader.GetValues(values);
                dt.Rows.Add(values);
            }
            reader.Close();
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);            
        }

3、SqlDataReader不填充表

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            DataTable dt = new DataTable();
            SqlCommand cmd=new SqlCommand(sqlstr,conn);
            dt.Columns.Add("c1",typeof(int));
            dt.Columns.Add("c2",typeof(string));
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                object[] values = new object[2];
                reader.GetValues(values);
               // dt.Rows.Add(values);//去掉该句
            }
            reader.Close();
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);            
        }

4、SqlDataReader不读取值

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            DataTable dt = new DataTable();
            SqlCommand cmd=new SqlCommand(sqlstr,conn);
            dt.Columns.Add("c1",typeof(int));
            dt.Columns.Add("c2",typeof(string));
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                //object[] values = new object[2];//去掉
                //reader.GetValues(values);
               // dt.Rows.Add(values);
            }
            reader.Close();
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);            
        }

4、SqlDataReader不遍历值

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            DataTable dt = new DataTable();
            SqlCommand cmd=new SqlCommand(sqlstr,conn);
            dt.Columns.Add("c1",typeof(int));
            dt.Columns.Add("c2",typeof(string));
            SqlDataReader reader = cmd.ExecuteReader();
            //while (reader.Read())
            //{
            //    //object[] values = new object[2];
            //    //reader.GetValues(values);
            //   // dt.Rows.Add(values);
            //}
            reader.Close();
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);            
        }

5、SqlDataReader不销毁

public static void ExSql()
        {
            string sqlstr="SELECT [C1],[C2] FROM [dbo].[T2]";
            DateTime datetime1 = DateTime.Now;
            DataTable dt = new DataTable();
            SqlCommand cmd = new SqlCommand(sqlstr, conn);
            dt.Columns.Add("c1",typeof(int));
            dt.Columns.Add("c2",typeof(string));
            SqlDataReader reader = cmd.ExecuteReader();
            //while (reader.Read())
            //{
            //    //object[] values = new object[2];
            //    //reader.GetValues(values);
            //   // dt.Rows.Add(values);
            //}
           
            DateTime datetime2 = DateTime.Now;
            string a = (datetime2 - datetime1).TotalMilliseconds.ToString();
            Console.WriteLine(a);     
            reader.Close(); //该局调换了位置     
        }

总结：还是用SqlDataAdapter好一点，至少语句简单