C#连接SqlServer并执行sql

原帖 http://shmily2038.javaeye.com/blog/727065

 

public class CommonFileUtil  
   {  
      string coonString="server=.;database=MySchool(你的数据库名称);uid=sa(登录数据库时的名称);pwd=123(密码可为空)";
SqlConnection coon=new SqlConnection(coonString);
 
       private void CreateConnection(object sender, EventArgs e)  
       {  
           string rs = "";  
           SqlConnection conn = CreateConnection();  
           //创建SqlCommand的实例  
           SqlCommand cmd = conn.CreateCommand();  
           //sql语句  
           cmd.CommandText = "select id,name from table1";  
           //打开连接  
           conn.Open();  
           //执行sql  
           cmd.ExecuteNonQuery();  
           //若要创建 SqlDataReader，必须调用 SqlCommand 对象的 ExecuteReader 方法，而不要直接使用构造函数  
           SqlDataReader dr = cmd.ExecuteReader();  
           //有点类似于java的arrylist方式  
           while (dr.Read())  
           {  
               rs += dr["id"] + " " + dr["name"] + "//n";  
           }  
           //关闭连接  
           conn.Close();  
       }  
 
       private void CallSP()  
       {  
           string rs = "";  
           SqlConnection conn = CreateConnection();  
           SqlCommand cmd = conn.CreateCommand();  
           //sp的名称  
           cmd.CommandText = "searchDate";  
           //sp的参数  
           cmd.Parameters.Add("@id", "234");  
           cmd.Parameters.Add("@name", "bcd");  
           //指定如何解释命令字符串，这里是存储过程  
           cmd.CommandType = CommandType.StoredProcedure;  
           conn.Open();  
           cmd.ExecuteNonQuery();  
           SqlDataReader dr = cmd.ExecuteReader();  
           while (dr.Read())  
           {  
               rs += dr["id"] + " " + dr["name"] + "//n";  
           }  
           conn.Close();  
       }  
 
       private SqlConnection CreateConnection()  
       {  
           //连接本地数据库的连接字符窜  
           string str = "server=(local);database=testdb;user id=sa;pwd=00000000";  
           //如果是远程连接,则例:server=192.168.0.1;  
           //创建连接  
           SqlConnection conn = new SqlConnection(str);  
           return conn;  
       }  
   } 

 public class CommonFileUtil
    {

        private void CreateConnection(object sender, EventArgs e)
        {
            string rs = "";
            SqlConnection conn = CreateConnection();
            //创建SqlCommand的实例
            SqlCommand cmd = conn.CreateCommand();
            //sql语句
            cmd.CommandText = "select id,name from table1";
            //打开连接
            conn.Open();
            //执行sql
            cmd.ExecuteNonQuery();
            //若要创建 SqlDataReader，必须调用 SqlCommand 对象的 ExecuteReader 方法，而不要直接使用构造函数
            SqlDataReader dr = cmd.ExecuteReader();
            //有点类似于java的arrylist方式
            while (dr.Read())
            {
                rs += dr["id"] + " " + dr["name"] + "//n";
            }
            //关闭连接
            conn.Close();
        }

        private void CallSP()
        {
            string rs = "";
            SqlConnection conn = CreateConnection();
            SqlCommand cmd = conn.CreateCommand();
            //sp的名称
            cmd.CommandText = "searchDate";
            //sp的参数
            cmd.Parameters.Add("@id", "234");
            cmd.Parameters.Add("@name", "bcd");
            //指定如何解释命令字符串，这里是存储过程
            cmd.CommandType = CommandType.StoredProcedure;
            conn.Open();
            cmd.ExecuteNonQuery();
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                rs += dr["id"] + " " + dr["name"] + "//n";
            }
            conn.Close();
        }

        private SqlConnection CreateConnection()
        {
            //连接本地数据库的连接字符窜
            string str = "server=(local);database=testdb;user id=sa;pwd=00000000";
            //如果是远程连接,则例:server=192.168.0.1;
            //创建连接
            SqlConnection conn = new SqlConnection(str);
            return conn;
        }
    }

此外还可以采用xml保存连接信息
建立过程如下:
1.右击工程名->添加->新建项
2.选择"应用程序配置文件",App.config文件
3.在其中添加连接信息,如:
Java代码
<?xml version="1.0" encoding="utf-8" ?>  
<configuration>  
  <connectionStrings>  
    <add name="DB_Connection" connectionString="Data Source=(local);Initial Catalog=DB_NAME;Integrated Security=SSPI" providerName="System.Data.SqlClient"/>  
    <add name="REMOTE_DB_Connection" connectionString="Data Source=192.168.1.1;Initial Catalog=DB_DIS_BASE;" providerName="System.Data.SqlClient"/>  
  </connectionStrings>  
</configuration> 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="DB_Connection" connectionString="Data Source=(local);Initial Catalog=DB_NAME;Integrated Security=SSPI" providerName="System.Data.SqlClient"/>
    <add name="REMOTE_DB_Connection" connectionString="Data Source=192.168.1.1;Initial Catalog=DB_DIS_BASE;" providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>
4.注意其中远程连接不要用SSPI
5.读取配置信息的代码:
Java代码
//strDataBaseName为需要连接的数据库连接字,即App.config中的DB_Connection或REMOTE_DB_Connection  
 private static SqlConnection CreateConnection(string strDataBaseName)  
        {  
            SqlConnection con = null;  
 
            try 
            {  
                //连接远程数据库的配置信息  
                string connectDBStr = System.Configuration.ConfigurationManager.ConnectionStrings[strDataBaseName].ConnectionString.ToString();  
                  
                //创建连接对象  
                con = new SqlConnection(connectDBStr);  
                  
                //返回对象  
                return con;  
            }  
            catch(Exception ex)   
            {  
                //抛出异常  
                throw new Exception(string.Format("创建数据库连接处理中发生异常,获取{0}的配置信息出错", strDataBaseName));  
            }  
        } 

//strDataBaseName为需要连接的数据库连接字,即App.config中的DB_Connection或REMOTE_DB_Connection
 private static SqlConnection CreateConnection(string strDataBaseName)
        {
            SqlConnection con = null;

            try
            {
                //连接远程数据库的配置信息
                string connectDBStr = System.Configuration.ConfigurationManager.ConnectionStrings[strDataBaseName].ConnectionString.ToString();
               
                //创建连接对象
                con = new SqlConnection(connectDBStr);
               
                //返回对象
                return con;
            }
            catch(Exception ex)
            {
                //抛出异常
                throw new Exception(string.Format("创建数据库连接处理中发生异常,获取{0}的配置信息出错", strDataBaseName));
            }
        }