CS通用项目系统搭建——三层架构第二天 (补一篇完整的SqlHelper)

短命女 2022-01-05 09:13 82阅读 0赞

#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

\#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

转载于:https://www.cnblogs.com/LittleDuan/p/10726444.html