c#中SQL Server 数据库的读写语句

数据库读写 CDataBase

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.Data.SqlClient;

 

namespace SelectCourse

{

    class CDataBase

    {

        public static string connStr;

        public static SqlConnection conn = new SqlConnection(connStr);

        public static DataSet GetDataFromDB(string sqlStr)

        {

            conn.ConnectionString = connStr;

            conn.Open();

            SqlDataAdapter myAdapter =new SqlDataAdapter(sqlStr, conn);

            DataSet myDataSet =new DataSet();

            myDataSet.Clear();

            myAdapter.Fill(myDataSet);

            conn.Close();

            if (myDataSet.Tables[0].Rows.Count != 0)

            {

                return myDataSet;

            }

            else

            {

                return null;

            }

        }

 

    

      

 public static bool UpdateDB(string sqlStr) //”写”数据库的静态方法

 

        {

            conn.Open();

            SqlCommand myCmd =new SqlCommand(sqlStr, conn);//定义数据库的命令对象

            myCmd.CommandType = CommandType.Text;//设置command的commandtyle属性

            myCmd.ExecuteNonQuery();//执行SQL语句

            conn.Close();

            return true;// 数据更新成功，返回true 

        }

    }   

}