数据库帮助类，包括新建数据库，删除数据库，还原数据代码,CSharp代码库,德仔网

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【CSharp】数据库帮助类，包括新建数据库，删除数据库，还原数据
作者:Dezai.CN / 发布于2013/7/19/ 966

	代码

	Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->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
	 /// </summary>
	 public abstract class DbHelperSQL
	 {
	// <?xml version="1.0" encoding="utf-8" ?>
	// <configuration>
	// <appSettings>
	// <!--连接主程序的字符串-->
	// <add key="connection" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=syt"/>
	// <!---->
	// <add key="connectionzt" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=syt_qwerthjkl"/>
	// <!--连接主SQLServer 的字符串-->
	// <add key="ConnectServer" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=master"/>
	// <!--建立数据库的连接字符串-->
	// <add key="connInit" value="data source=CONTRON-CAD9158;user id=sa;password=sa;persist security info=false;packet size=4096"/>
	// <!--SQLServer安装目录-->
	// <add key="sqlServerData" value="C:\Program Files\Microsoft SQL Server\MSSQL\Data"/>
	// </appSettings>
	// </configuration>
	 //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
	 public static string connectionString = PubConstant.ConnectionString;
	 public static string connectionString = System.Configuration.ConfigurationSettings.AppSettings["connection"];
	 public static string connInitStr = System.Configuration.ConfigurationSettings.AppSettings["connInit"];
	 public static string sqlServerPath = System.Configuration.ConfigurationSettings.AppSettings["sqlServerData"];
	 public static string connectServer = ConfigurationSettings.AppSettings["ConnectServer"];
	 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) > 0;
	 }
	 public static int GetMaxID(string FieldName, string TableName)
	 {
	 string strsql = "select max(" + FieldName + ")+1 from " + TableName;
	 object obj = GetSingle(strsql);
	 if (obj == null)
	 {
	 return 1;
	 }
	 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 = 0;
	 }
	 else
	 {
	 cmdresult = int.Parse(obj.ToString());
	 }
	 if (cmdresult == 0)
	 {
	 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 = 0;
	 }
	 else
	 {
	 cmdresult = int.Parse(obj.ToString());
	 }
	 if (cmdresult == 0)
	 {
	 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 = 0;
	 }
	 else
	 {
	 cmdresult = int.Parse(obj.ToString());
	 }
	 if (cmdresult == 0)
	 {
	 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(") == -1)
	 {
	 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) > 0;
	 if (isHave)
	 {
	 //引发事件
	 myDE.OnSolicitationEvent();
	 }
	 }
	 if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
	 {
	 if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
	 {
	 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) > 0;
	
	 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 == 0)
	 {
	 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 1;
	 }
	 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 = 0;
	 for (int n = 0; n < SQLStringList.Count; n++)
	 {
	 string strsql = SQLStringList[n];
	 if (strsql.Trim().Length > 1)
	 {
	 cmd.CommandText = strsql;
	 count += cmd.ExecuteNonQuery();
	 }
	 }
	 tx.Commit();
	 return count;
	 }
	 catch
	 {
	 tx.Rollback();
	 return 0;
	 }
	 }
	 }
	 /// <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 = 0;
	 //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(") == -1)
	 {
	 trans.Rollback();
	 return 0;
	 }
	
	 object obj = cmd.ExecuteScalar();
	 bool isHave = false;
	 if (obj == null && obj == DBNull.Value)
	 {
	 isHave = false;
	 }
	 isHave = Convert.ToInt32(obj) > 0;
	
	 if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
	 {
	 trans.Rollback();
	 return 0;
	 }
	 if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
	 {
	 trans.Rollback();
	 return 0;
	 }
	 continue;
	 }
	 int val = cmd.ExecuteNonQuery();
	 count += val;
	 if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
	 {
	 trans.Rollback();
	 return 0;
	 }
	 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 = 0;
	 //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 = 0;
	 //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, 4, ParameterDirection.ReturnValue,
	 false, 0, 0, string.Empty, DataRowVersion.Default, null));
	 return command;
	 }
	 #endregion
	
	 #region 还原与备份数据库
	 /// <summary>
	 /// 还原数据库
	 /// </summary>
	 /// <param name="backfile">数据库文件</param>
	 /// <returns>还原成功与否提示</returns>
	 public static bool RestoreDatabase(string dbName, string backfile)
	 {
	 ///杀死原来所有的数据库连接进程
	 ///
	 bool flag = false;
	
	 SqlConnection conn = new SqlConnection();
	 conn.ConnectionString = connectServer;
	 conn.Open();
	 string sql = "SELECT spid FROM sysprocesses ,sysdatabases WHERE sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.Name='pubs'";
	 SqlCommand cmd1 = new SqlCommand(sql, conn);
	 SqlDataReader dr;
	 ArrayList list = new ArrayList();
	 try
	 {
	 dr = cmd1.ExecuteReader();
	 while (dr.Read())
	 {
	 list.Add(dr.GetInt16(0));
	 }
	 dr.Close();
	
	 }
	 catch (SqlException eee)
	 {
	 flag = false;
	 Debug.Print(eee.ToString());
	 throw eee;
	 }
	 finally
	 {
	 conn.Close();
	
	 }
	 Debug.Print("使用的线程数" + list.Count.ToString());
	 for (int i = 0; i < list.Count; i++)
	 {
	 cmd1 = new SqlCommand(string.Format("KILL {0}", list[i].ToString()), conn);
	 cmd1.ExecuteNonQuery();
	 Debug.Print("you have killed thread " + list[i].ToString());
	 }
	
	 string killThread = string.Format("declare hcforeach cursor global for " +
	 "select 'kill '+rtrim(spid) from master.dbo.sysprocesses where dbid=db_id(N'{0}') exec sp_msforeach_worker '?'", dbName);
	 //还原前，kill进程
	 using(SqlConnection connServer=new SqlConnection(connectServer))
	 {
	 connServer.Open();
	 SqlCommand cmdServer = new SqlCommand(killThread, connServer);
	 cmdServer.ExecuteNonQuery();
	 }
	
	 //这里一定要是master数据库，而不能是要还原的数据库，因为这样便变成了有其它进程
	 //占用了数据库。
	 string constr = connectServer;
	 string BACKUP = String.Format("RESTORE DATABASE {0} FROM DISK = '{1}'", dbName, backfile);
	
	 SqlConnection con = new SqlConnection(constr);
	 SqlCommand cmd = new SqlCommand(BACKUP, con);
	 con.Open();
	 try
	 {
	 flag = true;
	 cmd.ExecuteNonQuery();
	 Debug.Print("还原成功");
	 }
	 catch (SqlException ee)
	 {
	 flag = false;
	 throw (ee);
	 Debug.Print("还原失败");
	 Debug.Print(ee.ToString());
	 }
	 finally
	 {
	 con.Close();
	 }
	 return flag;
	 }
	
	 /// <summary>
	 /// 备份数据库
	 /// </summary>
	 /// <returns>是否备份成功</returns>
	 public static bool BackDb(string dbName, string dbFileName)
	 {
	 bool flag = false;
	
	 //备份前，Kill掉进程
	 string killThread = string.Format("declare hcforeach cursor global for " +
	 "select 'kill '+rtrim(spid) from master.dbo.sysprocesses where dbid=db_id(N'{0}') exec sp_msforeach_worker '?'", dbName);
	 //还原前，kill进程
	 using (SqlConnection connServer = new SqlConnection(connectServer))
	 {
	 connServer.Open();
	 SqlCommand cmdServer = new SqlCommand(killThread, connServer);
	 cmdServer.ExecuteNonQuery();
	 }
	
	 SqlConnection conn;
	 SqlCommand cmd;
	 string strsql = "";
	 strsql = string.Format("backup database {0} to disk = '{1}'", dbName, dbFileName);
	 try
	 {
	 string strConn = connectServer;
	 conn = new SqlConnection(strConn);
	 conn.Open();
	 cmd = new SqlCommand(strsql, conn);
	 int index = cmd.ExecuteNonQuery();
	 if (index != 0)
	 {
	 flag = true;
	 }
	 conn.Close();
	 }
	 catch(Exception e)
	 {
	 flag = false;
	 throw new Exception("数据库备份时出错了！");
	 }
	 return flag;
	 }
	 #endregion
	
	 #region 建立于删除数据库
	 /// <summary>
	 /// 新建立数据库
	 /// </summary>
	 /// <param name="databaseName">数据库名</param>
	 public static void NewDataBase(string databaseName)
	 {
	 //调用ExecuteNonQuery()来创建数据库
	 string sql = string.Format("CREATE DATABASE {0}", databaseName);
	 ExecuteSql(connInitStr, "master", sql);
	 }
	
	 /// <summary>
	 /// 删除数据库
	 /// </summary>
	 public static void DropDataBase(string databaseName)
	 {
	 string killThread = string.Format("declare hcforeach cursor global for " +
	 "select 'kill '+rtrim(spid) from master.dbo.sysprocesses where dbid=db_id(N'{0}') exec sp_msforeach_worker '?'", databaseName);
	 //删除前，Kill掉进程
	 ExecuteSql(connInitStr, "master", killThread);
	
	 //调用ExecuteNonQuery()来删除数据库
	 string sqlQuery = string.Format("DROP DATABASE {0}", databaseName);
	 ExecuteSql(connInitStr, "master", sqlQuery);
	 }
	
	 private static void ExecuteSql(string conn, string dataBase, string sql)
	 {
	
	 System.Data.SqlClient.SqlConnection mySqlConnection = new System.Data.SqlClient.SqlConnection(conn);
	 System.Data.SqlClient.SqlCommand command = new System.Data.SqlClient.SqlCommand(sql, mySqlConnection);
	 command.Connection.Open();
	 command.Connection.ChangeDatabase(dataBase);
	 try
	 {
	 command.ExecuteNonQuery();
	 }
	 catch (Exception exp)
	 {
	 throw exp;
	 }
	 finally
	 {
	 mySqlConnection.Close();
	 }
	 }
	
	
	 #endregion
	 }

	}
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