ADO.NET 基础教程（二）

上一节讲到了怎样使用ADO.NET来查询数据，这节讲怎么样运行SQL的SELECT、INSERT和UPDATE命令及存储过程

1、存储过程

C#的代码如下：

/// <summary>
  /// 存储过程参数结构
  /// </summary>
  public struct ProcParam
  {
   public string ParamName;
   public string ParamValue;
   public System.Data.SqlDbType ParamType ;
  }

/// <summary>
  /// 执行一个返回数据集的存储过程
  /// </summary>
  /// <param name="strProcName">存储过程名称</param>
  /// <param name="alParamName" >参数名称</param>
  /// <param name="alParamValue" >参数值</param>
  /// <param name="constring">数据连接串</param>
  /// <returns></returns>
  public static System.Data.SqlClient.SqlDataReader ExecProcedure(string strProcName,System.Collections.ArrayList alParamName,System.Collections.ArrayList alParamValue,string constring)
  {

   System.Data.SqlClient.SqlConnection cn=new System.Data.SqlClient.SqlConnection (constring);
   cn.Open ();
   System.Data.SqlClient.SqlCommand cmd=new System.Data.SqlClient. SqlCommand ();
   cmd.Connection =cn;
   cmd.CommandType =System.Data.CommandType.StoredProcedure ;
   cmd.CommandText =strProcName;
   for(int i=0;i<alParamName.Count ;i++)
   {
    System.Data.SqlClient.SqlParameter param=new System.Data.SqlClient.SqlParameter (alParamName[i].ToString (),alParamValue[i].ToString ());
    cmd.Parameters.Add (param);
   }
   System.Data.SqlClient.SqlDataReader dr;
   dr=cmd.ExecuteReader ();
   return dr;
  }

上述代码可以执行任意参数的存储过程（返回一个数据集）

2、直接SQL命令

  /// <summary>
  /// 执行一个返回字符串的SQL SCRIPT
  /// </summary>
  /// <param name="constring" >连接串</param>
  /// <param name="SQL_COMMAND" >SQL命令</param>
  /// <returns>返回数据集</returns>
  public static string GetDataString(string SQL_COMMAND,string constring)
  {
   System.Data.SqlClient.SqlConnection cn=new System.Data.SqlClient.SqlConnection (constring);
   cn.Open ();
   System.Data.SqlClient.SqlCommand cmd=new System.Data.SqlClient. SqlCommand ();
   cmd.Connection =cn;
   cmd.CommandType =System.Data.CommandType.Text ;
   cmd.CommandText =SQL_COMMAND;
   string str="";
   try
   {
    str=cmd.ExecuteScalar().ToString ();
   }
   catch(System.Data.SqlClient.SqlException e)
   {
    System.Diagnostics.Debug.WriteLine (e.Message );
   }
   catch(Exception ex)
   {
    System.Diagnostics.Debug.WriteLine (ex.Message );
   }
   return str;
  }

/// <summary>
  /// 执行一个无返回的SQL
  /// </summary>
  /// <param name="SQL_COMMAND"></param>
  /// <param name="constring"></param>
  /// <returns></returns>
  public static void Executesql(string SQL_COMMAND,string constring)
  {
   System.Data.SqlClient.SqlConnection cn=new System.Data.SqlClient.SqlConnection (constring);
   cn.Open ();
   System.Data.SqlClient.SqlCommand cmd=new System.Data.SqlClient. SqlCommand ();
   cmd.Connection =cn;
   cmd.CommandType =System.Data.CommandType.Text ;
   cmd.CommandText =SQL_COMMAND;
   try
   {
    cmd.ExecuteNonQuery ();
   }
   catch(System.Data.SqlClient.SqlException e)
   {
    System.Diagnostics.Debug.WriteLine (e.Message );
   }
   catch(Exception ex)
   {
    System.Diagnostics.Debug.WriteLine (ex.Message );
   }
  }