C#访问SQLServer数据库访问帮助类

SQLServer数据库访问帮助类

这里有一个Mysql帮助类的使用例子可以参考（大同小异）

写了一个Mysql的例子，SQLServer的差不多，一样的

C#简单三层结构设计UI、BLL、DAL

1.web.config配置数据库连接字符串

 <?xml version="1.0"?>
 <configuration>
   <appSettings>
     <!-- 连接字符串是否加密 -->
     <add key="ConStringEncrypt" value="false"/>
     <!-- 数据库连接字符串,（如果采用加密方式，上面一项要设置为true；加密工具，可在官方下载，
              如果使用明文这样server=127.0.0.1;database=.....,上面则设置为false。 -->
     <add key="ConnectionString" value="server=127.0.0.1;database=BenXHCMS;uid=sa;pwd=jyf"/>
   </appSettings>
 </configuration>

2.数据库字符串读取类（多一个加密算法，可以自己添加）

     public class PubConstant
     {
         /// <summary>
         /// 获取连接字符串
         /// </summary>
         public static string ConnectionString
         {
             get
             {
                 string _connectionString = ConfigurationManager.AppSettings["ConnectionString"];
                 string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"];
                 if (ConStringEncrypt == "true")
                 {
                     _connectionString = DESEncrypt.Decrypt(_connectionString);
                 }
                 return _connectionString;
             }
         }
 
         /// <summary>
         /// 得到web.config里配置项的数据库连接字符串。
         /// </summary>
         /// <param name="configName"></param>
         /// <returns></returns>
         public static string GetConnectionString(string configName)
         {
             string connectionString = ConfigurationManager.AppSettings[configName];
             string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"];
             if (ConStringEncrypt == "true")
             {
                 connectionString = DESEncrypt.Decrypt(connectionString);
             }
             return connectionString;
         }
 
     }

3.SQLServer数据库访问类

 using System;
 using System.Collections;
 using System.Collections.Specialized;
 using System.Data;
 using System.Data.SqlClient;
 using System.Configuration;
 using System.Data.Common;
 using System.Collections.Generic;
 namespace Maticsoft.DBUtility
 {
     /// <summary>
     /// 数据访问抽象基础类
     /// Copyright (C) Maticsoft
     /// </summary>
     public abstract class DbHelperSQL
     {
         //数据库连接字符串(web.config来配置)，多数据库可使用DbHelperSQLP来实现.
         public static string connectionString = PubConstant.ConnectionString;
         public DbHelperSQL()
         {
         }
 
         #region 公用方法
         /// <summary>
         /// 判断是否存在某表的某个字段
         /// </summary>
         /// <param name="tableName">表名称</param>
         /// <param name="columnName">列名称</param>
         /// <returns>是否存在</returns>
         public static bool ColumnExists(string tableName, string columnName)
         {
             string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
             object res = GetSingle(sql);
             if (res == null)
             {
                 return false;
             }
             return Convert.ToInt32(res) > ;
         }
         public static int GetMaxID(string FieldName, string TableName)
         {
             string strsql = "select max(" + FieldName + ")+1 from " + TableName;
             object obj = GetSingle(strsql);
             if (obj == null)
             {
                 return ;
             }
             else
             {
                 return int.Parse(obj.ToString());
             }
         }
         public static bool Exists(string strSql)
         {
             object obj = GetSingle(strSql);
             int cmdresult;
             if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
             {
                 cmdresult = ;
             }
             else
             {
                 cmdresult = int.Parse(obj.ToString()); //也可能=0
             }
             if (cmdresult == )
             {
                 return false;
             }
             else
             {
                 return true;
             }
         }
         /// <summary>
         /// 表是否存在
         /// </summary>
         /// <param name="TableName"></param>
         /// <returns></returns>
         public static bool TabExists(string TableName)
         {
             string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1";
             //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')";
             object obj = GetSingle(strsql);
             int cmdresult;
             if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
             {
                 cmdresult = ;
             }
             else
             {
                 cmdresult = int.Parse(obj.ToString());
             }
             if (cmdresult == )
             {
                 return false;
             }
             else
             {
                 return true;
             }
         }
         public static bool Exists(string strSql, params SqlParameter[] cmdParms)
         {
             object obj = GetSingle(strSql, cmdParms);
             int cmdresult;
             if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
             {
                 cmdresult = ;
             }
             else
             {
                 cmdresult = int.Parse(obj.ToString());
             }
             if (cmdresult == )
             {
                 return false;
             }
             else
             {
                 return true;
             }
         }
         #endregion
 
         #region  执行简单SQL语句
 
         /// <summary>
         /// 执行SQL语句，返回影响的记录数
         /// </summary>
         /// <param name="SQLString">SQL语句</param>
         /// <returns>影响的记录数</returns>
         public static int ExecuteSql(string SQLString)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                 {
                     try
                     {
                         connection.Open();
                         int rows = cmd.ExecuteNonQuery();
                         return rows;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
 
         public static int ExecuteSqlByTime(string SQLString, int Times)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                 {
                     try
                     {
                         connection.Open();
                         cmd.CommandTimeout = Times;
                         int rows = cmd.ExecuteNonQuery();
                         return rows;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
 
         /// <summary>
         /// 执行Sql和Oracle滴混合事务
         /// </summary>
         /// <param name="list">SQL命令行列表</param>
         /// <param name="oracleCmdSqlList">Oracle命令行列表</param>
         /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>
         public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 SqlCommand cmd = new SqlCommand();
                 cmd.Connection = conn;
                 SqlTransaction tx = conn.BeginTransaction();
                 cmd.Transaction = tx;
                 try
                 {
                     foreach (CommandInfo myDE in list)
                     {
                         string cmdText = myDE.CommandText;
                         SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                         PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
                         if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
                         {
                             if (myDE.CommandText.ToLower().IndexOf("count(") == -)
                             {
                                 tx.Rollback();
                                 throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式");
                                 //return 0;
                             }
 
                             object obj = cmd.ExecuteScalar();
                             bool isHave = false;
                             if (obj == null && obj == DBNull.Value)
                             {
                                 isHave = false;
                             }
                             isHave = Convert.ToInt32(obj) > ;
                             if (isHave)
                             {
                                 //引发事件
                                 myDE.OnSolicitationEvent();
                             }
                         }
                         if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                         {
                             if (myDE.CommandText.ToLower().IndexOf("count(") == -)
                             {
                                 tx.Rollback();
                                 throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                                 //return 0;
                             }
 
                             object obj = cmd.ExecuteScalar();
                             bool isHave = false;
                             if (obj == null && obj == DBNull.Value)
                             {
                                 isHave = false;
                             }
                             isHave = Convert.ToInt32(obj) > ;
 
                             if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                             {
                                 tx.Rollback();
                                 throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
                                 //return 0;
                             }
                             if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                             {
                                 tx.Rollback();
                                 throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
                                 //return 0;
                             }
                             continue;
                         }
                         int val = cmd.ExecuteNonQuery();
                         if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == )
                         {
                             tx.Rollback();
                             throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
                             //return 0;
                         }
                         cmd.Parameters.Clear();
                     }
                     string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
                     bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
                     if (!res)
                     {
                         tx.Rollback();
                         throw new Exception("Oracle执行失败");
                         // return -1;
                     }
                     tx.Commit();
                     return ;
                 }
                 catch (System.Data.SqlClient.SqlException e)
                 {
                     tx.Rollback();
                     throw e;
                 }
                 catch (Exception e)
                 {
                     tx.Rollback();
                     throw e;
                 }
             }
         }
         /// <summary>
         /// 执行多条SQL语句，实现数据库事务。
         /// </summary>
         /// <param name="SQLStringList">多条SQL语句</param>
         public static int ExecuteSqlTran(List<String> SQLStringList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 SqlCommand cmd = new SqlCommand();
                 cmd.Connection = conn;
                 SqlTransaction tx = conn.BeginTransaction();
                 cmd.Transaction = tx;
                 try
                 {
                     int count = ;
                     for (int n = ; n < SQLStringList.Count; n++)
                     {
                         string strsql = SQLStringList[n];
                         if (strsql.Trim().Length > )
                         {
                             cmd.CommandText = strsql;
                             count += cmd.ExecuteNonQuery();
                         }
                     }
                     tx.Commit();
                     return count;
                 }
                 catch
                 {
                     tx.Rollback();
                     return ;
                 }
             }
         }
         /// <summary>
         /// 执行带一个存储过程参数的的SQL语句。
         /// </summary>
         /// <param name="SQLString">SQL语句</param>
         /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
         /// <returns>影响的记录数</returns>
         public static int ExecuteSql(string SQLString, string content)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 SqlCommand cmd = new SqlCommand(SQLString, connection);
                 System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                 myParameter.Value = content;
                 cmd.Parameters.Add(myParameter);
                 try
                 {
                     connection.Open();
                     int rows = cmd.ExecuteNonQuery();
                     return rows;
                 }
                 catch (System.Data.SqlClient.SqlException e)
                 {
                     throw e;
                 }
                 finally
                 {
                     cmd.Dispose();
                     connection.Close();
                 }
             }
         }
         /// <summary>
         /// 执行带一个存储过程参数的的SQL语句。
         /// </summary>
         /// <param name="SQLString">SQL语句</param>
         /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
         /// <returns>影响的记录数</returns>
         public static object ExecuteSqlGet(string SQLString, string content)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 SqlCommand cmd = new SqlCommand(SQLString, connection);
                 System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                 myParameter.Value = content;
                 cmd.Parameters.Add(myParameter);
                 try
                 {
                     connection.Open();
                     object obj = cmd.ExecuteScalar();
                     if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                     {
                         return null;
                     }
                     else
                     {
                         return obj;
                     }
                 }
                 catch (System.Data.SqlClient.SqlException e)
                 {
                     throw e;
                 }
                 finally
                 {
                     cmd.Dispose();
                     connection.Close();
                 }
             }
         }
         /// <summary>
         /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
         /// </summary>
         /// <param name="strSQL">SQL语句</param>
         /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
         /// <returns>影响的记录数</returns>
         public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 SqlCommand cmd = new SqlCommand(strSQL, connection);
                 System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
                 myParameter.Value = fs;
                 cmd.Parameters.Add(myParameter);
                 try
                 {
                     connection.Open();
                     int rows = cmd.ExecuteNonQuery();
                     return rows;
                 }
                 catch (System.Data.SqlClient.SqlException e)
                 {
                     throw e;
                 }
                 finally
                 {
                     cmd.Dispose();
                     connection.Close();
                 }
             }
         }
 
         /// <summary>
         /// 执行一条计算查询结果语句，返回查询结果（object）。
         /// </summary>
         /// <param name="SQLString">计算查询结果语句</param>
         /// <returns>查询结果（object）</returns>
         public static object GetSingle(string SQLString)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                 {
                     try
                     {
                         connection.Open();
                         object obj = cmd.ExecuteScalar();
                         if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                         {
                             return null;
                         }
                         else
                         {
                             return obj;
                         }
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
         public static object GetSingle(string SQLString, int Times)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                 {
                     try
                     {
                         connection.Open();
                         cmd.CommandTimeout = Times;
                         object obj = cmd.ExecuteScalar();
                         if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                         {
                             return null;
                         }
                         else
                         {
                             return obj;
                         }
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         connection.Close();
                         throw e;
                     }
                 }
             }
         }
         /// <summary>
         /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
         /// </summary>
         /// <param name="strSQL">查询语句</param>
         /// <returns>SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(string strSQL)
         {
             SqlConnection connection = new SqlConnection(connectionString);
             SqlCommand cmd = new SqlCommand(strSQL, connection);
             try
             {
                 connection.Open();
                 SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                 return myReader;
             }
             catch (System.Data.SqlClient.SqlException e)
             {
                 throw e;
             }   
 
         }
         /// <summary>
         /// 执行查询语句，返回DataSet
         /// </summary>
         /// <param name="SQLString">查询语句</param>
         /// <returns>DataSet</returns>
         public static DataSet Query(string SQLString)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 DataSet ds = new DataSet();
                 try
                 {
                     connection.Open();
                     SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                     command.Fill(ds, "ds");
                 }
                 catch (System.Data.SqlClient.SqlException ex)
                 {
                     throw new Exception(ex.Message);
                 }
                 return ds;
             }
         }
         public static DataSet Query(string SQLString, int Times)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 DataSet ds = new DataSet();
                 try
                 {
                     connection.Open();
                     SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                     command.SelectCommand.CommandTimeout = Times;
                     command.Fill(ds, "ds");
                 }
                 catch (System.Data.SqlClient.SqlException ex)
                 {
                     throw new Exception(ex.Message);
                 }
                 return ds;
             }
         }
 
         #endregion
 
         #region 执行带参数的SQL语句
 
         /// <summary>
         /// 执行SQL语句，返回影响的记录数
         /// </summary>
         /// <param name="SQLString">SQL语句</param>
         /// <returns>影响的记录数</returns>
         public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand())
                 {
                     try
                     {
                         PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                         int rows = cmd.ExecuteNonQuery();
                         cmd.Parameters.Clear();
                         return rows;
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         throw e;
                     }
                 }
             }
         }
 
         /// <summary>
         /// 执行多条SQL语句，实现数据库事务。
         /// </summary>
         /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
         public static void ExecuteSqlTran(Hashtable SQLStringList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 using (SqlTransaction trans = conn.BeginTransaction())
                 {
                     SqlCommand cmd = new SqlCommand();
                     try
                     {
                         //循环
                         foreach (DictionaryEntry myDE in SQLStringList)
                         {
                             string cmdText = myDE.Key.ToString();
                             SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                             PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                             int val = cmd.ExecuteNonQuery();
                             cmd.Parameters.Clear();
                         }
                         trans.Commit();
                     }
                     catch
                     {
                         trans.Rollback();
                         throw;
                     }
                 }
             }
         }
         /// <summary>
         /// 执行多条SQL语句，实现数据库事务。
         /// </summary>
         /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
         public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 using (SqlTransaction trans = conn.BeginTransaction())
                 {
                     SqlCommand cmd = new SqlCommand();
                     try
                     { int count = ;
                         //循环
                         foreach (CommandInfo myDE in cmdList)
                         {
                             string cmdText = myDE.CommandText;
                             SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                             PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
 
                             if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                             {
                                 if (myDE.CommandText.ToLower().IndexOf("count(") == -)
                                 {
                                     trans.Rollback();
                                     return ;
                                 }
 
                                 object obj = cmd.ExecuteScalar();
                                 bool isHave = false;
                                 if (obj == null && obj == DBNull.Value)
                                 {
                                     isHave = false;
                                 }
                                 isHave = Convert.ToInt32(obj) > ;
 
                                 if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                                 {
                                     trans.Rollback();
                                     return ;
                                 }
                                 if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                                 {
                                     trans.Rollback();
                                     return ;
                                 }
                                 continue;
                             }
                             int val = cmd.ExecuteNonQuery();
                             count += val;
                             if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == )
                             {
                                 trans.Rollback();
                                 return ;
                             }
                             cmd.Parameters.Clear();
                         }
                         trans.Commit();
                         return count;
                     }
                     catch
                     {
                         trans.Rollback();
                         throw;
                     }
                 }
             }
         }
         /// <summary>
         /// 执行多条SQL语句，实现数据库事务。
         /// </summary>
         /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
         public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 using (SqlTransaction trans = conn.BeginTransaction())
                 {
                     SqlCommand cmd = new SqlCommand();
                     try
                     {
                         int indentity = ;
                         //循环
                         foreach (CommandInfo myDE in SQLStringList)
                         {
                             string cmdText = myDE.CommandText;
                             SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                             foreach (SqlParameter q in cmdParms)
                             {
                                 if (q.Direction == ParameterDirection.InputOutput)
                                 {
                                     q.Value = indentity;
                                 }
                             }
                             PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                             int val = cmd.ExecuteNonQuery();
                             foreach (SqlParameter q in cmdParms)
                             {
                                 if (q.Direction == ParameterDirection.Output)
                                 {
                                     indentity = Convert.ToInt32(q.Value);
                                 }
                             }
                             cmd.Parameters.Clear();
                         }
                         trans.Commit();
                     }
                     catch
                     {
                         trans.Rollback();
                         throw;
                     }
                 }
             }
         }
         /// <summary>
         /// 执行多条SQL语句，实现数据库事务。
         /// </summary>
         /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]）</param>
         public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
         {
             using (SqlConnection conn = new SqlConnection(connectionString))
             {
                 conn.Open();
                 using (SqlTransaction trans = conn.BeginTransaction())
                 {
                     SqlCommand cmd = new SqlCommand();
                     try
                     {
                         int indentity = ;
                         //循环
                         foreach (DictionaryEntry myDE in SQLStringList)
                         {
                             string cmdText = myDE.Key.ToString();
                             SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                             foreach (SqlParameter q in cmdParms)
                             {
                                 if (q.Direction == ParameterDirection.InputOutput)
                                 {
                                     q.Value = indentity;
                                 }
                             }
                             PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                             int val = cmd.ExecuteNonQuery();
                             foreach (SqlParameter q in cmdParms)
                             {
                                 if (q.Direction == ParameterDirection.Output)
                                 {
                                     indentity = Convert.ToInt32(q.Value);
                                 }
                             }
                             cmd.Parameters.Clear();
                         }
                         trans.Commit();
                     }
                     catch
                     {
                         trans.Rollback();
                         throw;
                     }
                 }
             }
         }
         /// <summary>
         /// 执行一条计算查询结果语句，返回查询结果（object）。
         /// </summary>
         /// <param name="SQLString">计算查询结果语句</param>
         /// <returns>查询结果（object）</returns>
         public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 using (SqlCommand cmd = new SqlCommand())
                 {
                     try
                     {
                         PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                         object obj = cmd.ExecuteScalar();
                         cmd.Parameters.Clear();
                         if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                         {
                             return null;
                         }
                         else
                         {
                             return obj;
                         }
                     }
                     catch (System.Data.SqlClient.SqlException e)
                     {
                         throw e;
                     }
                 }
             }
         }
 
         /// <summary>
         /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
         /// </summary>
         /// <param name="strSQL">查询语句</param>
         /// <returns>SqlDataReader</returns>
         public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
         {
             SqlConnection connection = new SqlConnection(connectionString);
             SqlCommand cmd = new SqlCommand();
             try
             {
                 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                 SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                 cmd.Parameters.Clear();
                 return myReader;
             }
             catch (System.Data.SqlClient.SqlException e)
             {
                 throw e;
             }
             //            finally
             //            {
             //                cmd.Dispose();
             //                connection.Close();
             //            }    
 
         }
 
         /// <summary>
         /// 执行查询语句，返回DataSet
         /// </summary>
         /// <param name="SQLString">查询语句</param>
         /// <returns>DataSet</returns>
         public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 SqlCommand cmd = new SqlCommand();
                 PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                 using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                 {
                     DataSet ds = new DataSet();
                     try
                     {
                         da.Fill(ds, "ds");
                         cmd.Parameters.Clear();
                     }
                     catch (System.Data.SqlClient.SqlException ex)
                     {
                         throw new Exception(ex.Message);
                     }
                     return ds;
                 }
             }
         }
 
         private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)
         {
             if (conn.State != ConnectionState.Open)
                 conn.Open();
             cmd.Connection = conn;
             cmd.CommandText = cmdText;
             if (trans != null)
                 cmd.Transaction = trans;
             cmd.CommandType = CommandType.Text;//cmdType;
             if (cmdParms != null)
             {
 
                 foreach (SqlParameter parameter in cmdParms)
                 {
                     if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                         (parameter.Value == null))
                     {
                         parameter.Value = DBNull.Value;
                     }
                     cmd.Parameters.Add(parameter);
                 }
             }
         }
 
         #endregion
 
         #region 存储过程操作
 
         /// <summary>
         /// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close )
         /// </summary>
         /// <param name="storedProcName">存储过程名</param>
         /// <param name="parameters">存储过程参数</param>
         /// <returns>SqlDataReader</returns>
         public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
         {
             SqlConnection connection = new SqlConnection(connectionString);
             SqlDataReader returnReader;
             connection.Open();
             SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
             command.CommandType = CommandType.StoredProcedure;
             returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
             return returnReader;
 
         }
 
         /// <summary>
         /// 执行存储过程
         /// </summary>
         /// <param name="storedProcName">存储过程名</param>
         /// <param name="parameters">存储过程参数</param>
         /// <param name="tableName">DataSet结果中的表名</param>
         /// <returns>DataSet</returns>
         public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 DataSet dataSet = new DataSet();
                 connection.Open();
                 SqlDataAdapter sqlDA = new SqlDataAdapter();
                 sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                 sqlDA.Fill(dataSet, tableName);
                 connection.Close();
                 return dataSet;
             }
         }
         public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 DataSet dataSet = new DataSet();
                 connection.Open();
                 SqlDataAdapter sqlDA = new SqlDataAdapter();
                 sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                 sqlDA.SelectCommand.CommandTimeout = Times;
                 sqlDA.Fill(dataSet, tableName);
                 connection.Close();
                 return dataSet;
             }
         }
 
         /// <summary>
         /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
         /// </summary>
         /// <param name="connection">数据库连接</param>
         /// <param name="storedProcName">存储过程名</param>
         /// <param name="parameters">存储过程参数</param>
         /// <returns>SqlCommand</returns>
         private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
         {
             SqlCommand command = new SqlCommand(storedProcName, connection);
             command.CommandType = CommandType.StoredProcedure;
             foreach (SqlParameter parameter in parameters)
             {
                 if (parameter != null)
                 {
                     // 检查未分配值的输出参数,将其分配以DBNull.Value.
                     if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                         (parameter.Value == null))
                     {
                         parameter.Value = DBNull.Value;
                     }
                     command.Parameters.Add(parameter);
                 }
             }
 
             return command;
         }
 
         /// <summary>
         /// 执行存储过程，返回影响的行数
         /// </summary>
         /// <param name="storedProcName">存储过程名</param>
         /// <param name="parameters">存储过程参数</param>
         /// <param name="rowsAffected">影响的行数</param>
         /// <returns></returns>
         public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
         {
             using (SqlConnection connection = new SqlConnection(connectionString))
             {
                 int result;
                 connection.Open();
                 SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
                 rowsAffected = command.ExecuteNonQuery();
                 result = (int)command.Parameters["ReturnValue"].Value;
                 //Connection.Close();
                 return result;
             }
         }
 
         /// <summary>
         /// 创建 SqlCommand 对象实例(用来返回一个整数值)
         /// </summary>
         /// <param name="storedProcName">存储过程名</param>
         /// <param name="parameters">存储过程参数</param>
         /// <returns>SqlCommand 对象实例</returns>
         private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
         {
             SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
             command.Parameters.Add(new SqlParameter("ReturnValue",
                 SqlDbType.Int, , ParameterDirection.ReturnValue,
                 false, , , string.Empty, DataRowVersion.Default, null));
             return command;
         }
         #endregion
 
     }
 
 }