CS通用项目系统搭建——三层架构第二天 (补一篇完整的SqlHelper)

2023-02-07 20:50:28

#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();

          //设置参数值

          if (parameterValues != null)

          {

              for (int i = ; 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

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