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  • SqlHelper

    public static readonly string connString = ConfigurationManager.ConnectionStrings["Permissions"].ToString();
    
     #region ExecuteNonQuery(如果是增,删,修)
          /// <summary>
          /// 执行sql命令
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="commandType">命令类型</param>
          /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
          /// <param name="commandParameters">参数</param>
          /// <returns>受影响的行数</returns>
          public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
          {
    
              SqlCommand cmd = new SqlCommand();
    
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
                  PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
                  int val = cmd.ExecuteNonQuery();
    
                  return val;
              }
          }
    
          /// <summary>
          /// 执行Sql Server存储过程
          /// 注意:不能执行有out 参数的存储过程
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="spName">存储过程名</param>
          /// <param name="parameterValues">对象参数</param>
          /// <returns>受影响的行数</returns>
          public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
          {
    
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
                  SqlCommand cmd = new SqlCommand();
    
                  PrepareCommand(cmd, conn, spName, parameterValues);
                  int val = cmd.ExecuteNonQuery();
    
                  return val;
              }
          }
          #endregion
    
          #region ExecuteReader(如果只是读数据)
          /// <summary>
          ///  执行sql命令
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="commandType">命令类型</param>
          /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
          /// <param name="commandParameters">参数</param>
          /// <returns>SqlDataReader 对象</returns>
          public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
          {
    
              SqlConnection conn = new SqlConnection(connectionString);
              try
              {
                  SqlCommand cmd = new SqlCommand();
                  PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
                  SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
    
                  return rdr;
              }
              catch
              {
                  conn.Close();
                  throw;
              }
          }
    
          /// <summary>
          /// 执行Sql Server存储过程
          /// 注意:不能执行有out 参数的存储过程
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="spName">存储过程名</param>
          /// <param name="parameterValues">对象参数</param>
          /// <returns>受影响的行数</returns>
          public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
          {
              SqlConnection conn = new SqlConnection(connectionString);
              try
              {
                  SqlCommand cmd = new SqlCommand();
    
                  PrepareCommand(cmd, conn, spName, parameterValues);
                  SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
    
                  return rdr;
              }
              catch
              {
                  conn.Close();
                  throw;
              }
    
          }
          #endregion
    
          #region ExecuteDataset(如果查询一个数据集)
    
          /// <summary>
          /// 执行Sql Server存储过程
          /// 注意:不能执行有out 参数的存储过程
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="spName">存储过程名</param>
          /// <param name="parameterValues">对象参数</param>
          /// <returns>DataSet对象</returns>
          public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
          {
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
                  SqlCommand cmd = new SqlCommand();
    
                  PrepareCommand(cmd, conn, spName, parameterValues);
    
                  using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                  {
                      DataSet ds = new DataSet();
    
                      da.Fill(ds);
    
                      return ds;
                  }
              }
          }
    
    
          /// <summary>
          /// 执行Sql 命令
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="commandType">命令类型</param>
          /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
          /// <param name="commandParameters">参数</param>
          /// <returns>DataSet 对象</returns>
          public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
          {
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
    
                  SqlCommand cmd = new SqlCommand();
    
                  PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
                  using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                  {
                      DataSet ds = new DataSet();
    
                      da.Fill(ds);
    
                      return ds;
                  }
              }
          }
    
          #endregion
    
          #region ExecuteScalar (如果你只查询一个值)
          /// <summary>
          /// 执行Sql 命令
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="commandType">命令类型</param>
          /// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
          /// <param name="commandParameters">参数</param>
          /// <returns>执行结果对象</returns>
          public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
          {
              SqlCommand cmd = new SqlCommand();
    
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
                  PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
                  object val = cmd.ExecuteScalar();
    
                  return val;
              }
          }
    
          /// <summary>
          /// 执行Sql Server存储过程
          /// 注意:不能执行有out 参数的存储过程
          /// </summary>
          /// <param name="connectionString">连接字符串</param>
          /// <param name="spName">存储过程名</param>
          /// <param name="parameterValues">对象参数</param>
          /// <returns>执行结果对象</returns>
          public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
          {
              SqlCommand cmd = new SqlCommand();
    
              using (SqlConnection conn = new SqlConnection(connectionString))
              {
                  PrepareCommand(cmd, conn, spName, parameterValues);
                  object val = cmd.ExecuteScalar();
    
                  return val;
              }
          }
    
    
          #endregion
    
          #region Private Method
          /// <summary>
          /// 设置一个等待执行的SqlCommand对象
          /// </summary>
          /// <param name="cmd">SqlCommand 对象,不允许空对象</param>
          /// <param name="conn">SqlConnection 对象,不允许空对象</param>
          /// <param name="commandText">Sql 语句</param>
          /// <param name="cmdParms">SqlParameters  对象,允许为空对象</param>
          private static void PrepareCommand(SqlCommand cmd, CommandType commandType, SqlConnection conn, string commandText, SqlParameter[] cmdParms)
          {
              //打开连接
              if (conn.State != ConnectionState.Open)
                  conn.Open();
    
              //设置SqlCommand对象
              cmd.Connection = conn;
              cmd.CommandText = commandText;
              cmd.CommandType = commandType;
    
              if (cmdParms != null)
              {
                  foreach (SqlParameter parm in cmdParms)
                      cmd.Parameters.Add(parm);
              }
          }
    
          /// <summary>
          /// 设置一个等待执行存储过程的SqlCommand对象
          /// </summary>
          /// <param name="cmd">SqlCommand 对象,不允许空对象</param>
          /// <param name="conn">SqlConnection 对象,不允许空对象</param>
          /// <param name="spName">Sql 语句</param>
          /// <param name="parameterValues">不定个数的存储过程参数,允许为空</param>
          private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, string spName, params object[] parameterValues)
          {
              //打开连接
              if (conn.State != ConnectionState.Open)
                  conn.Open();
    
              //设置SqlCommand对象
              cmd.Connection = conn;
              cmd.CommandText = spName;
              cmd.CommandType = CommandType.StoredProcedure;
    
              //获取存储过程的参数
              SqlCommandBuilder.DeriveParameters(cmd);
    
              //移除Return_Value 参数
              cmd.Parameters.RemoveAt(0);
    
              //设置参数值
              if (parameterValues != null)
              {
                  for (int i = 0; i < cmd.Parameters.Count; i++)
                  {
                      cmd.Parameters[i].Value = parameterValues[i];
    
                  }
              }
          }
          #endregion
    
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  • 原文地址:https://www.cnblogs.com/sunliyuan/p/7620324.html
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