《ASP.NET1200例》当前上下文中不存在名称configurationmanager

当前上下文中不存在名称ConfigurationManager的解决方法

今晚做项目在DBHelper.cs类中的数据库连接要改到web.config里面调用，结果在编译的时候却发现提示错误：

当前上下文中不存在名称"ConfigurationManager"

明明是已经添加了using System.Configuration但还是不行，后来回想了一下，还要再添加什么的，怪我不认真，真是的，原来还要在DAL类库中添加引用，加入里面的System.Configuration

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Collections;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Runtime.InteropServices;
using System.Configuration;

namespace DBUtility
{
    public abstract class DbHelperSQL
    {
        /// <summary>
        /// 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.
        /// </summary>
        public static string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

        /// <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;
        }

        /// <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)
            {
                CommandType = CommandType.StoredProcedure
            };
            foreach (SqlParameter parameter in parameters)
            {
                if (parameter != null)
                {
                    if (((parameter.Direction == ParameterDirection.InputOutput) || (parameter.Direction == ParameterDirection.Input)) && (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    command.Parameters.Add(parameter);
                }
            }
            return command;
        }

        /// <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)
        {
            object single = GetSingle("select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'");
            if (single == null)
            {
                return false;
            }
            return (Convert.ToInt32(single) > );
        }

        /// <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)
        {
            SqlDataReader reader2;
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand command = new SqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                reader2 = command.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (SqlException exception)
            {
                throw exception;
            }
            return reader2;
        }

        /// <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)
        {
            SqlDataReader reader2;
            SqlConnection conn = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, conn, null, SQLString, cmdParms);
                SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                reader2 = reader;
            }
            catch (SqlException exception)
            {
                throw exception;
            }
            return reader2;
        }

        /// <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)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    num2 = command.ExecuteNonQuery();
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return num2;
        }

        /// <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)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int num = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    num2 = num;
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    if (cmd != null)
                    {
                        cmd.Dispose();
                    }
                }
            }
            return num2;
        }

        /// <summary>
        /// 执行SQL语句，返回影响的记录数,不会自动关闭连接
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <param name="_connection">connection</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, SqlConnection _connection)
        {
            int num2;
            SqlCommand command = new SqlCommand(SQLString, _connection);
            try
            {
                _connection.Open();
                num2 = command.ExecuteNonQuery();
            }
            catch (SqlException exception)
            {
                throw exception;
            }
            finally
            {
                if (command != null)
                {
                    command.Dispose();
                }
            }
            return num2;
        }

        /// <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)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                SqlParameter parameter = new SqlParameter("@content", SqlDbType.NText)
                {
                    Value = content
                };
                command.Parameters.Add(parameter);
                try
                {
                    connection.Open();
                    num2 = command.ExecuteNonQuery();
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    command.Dispose();
                    connection.Close();
                }
            }
            return num2;
        }

        /// <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, SqlConnection conn, params SqlParameter[] cmdParms)
        {
            int num2;
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, conn, null, SQLString, cmdParms);
                int num = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                num2 = num;
            }
            catch (SqlException exception)
            {
                throw exception;
            }
            finally
            {
                if (cmd != null)
                {
                    cmd.Dispose();
                }
            }
            return num2;
        }

        /// <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, string _connectionString, params SqlParameter[] cmdParms)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    int num = cmd.ExecuteNonQuery();
                    cmd.Parameters.Clear();
                    num2 = num;
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    if (cmd != null)
                    {
                        cmd.Dispose();
                    }
                }
            }
            return num2;
        }

        public static int ExecuteSqlByTime(string SQLString, int Times)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    command.CommandTimeout = Times;
                    num2 = command.ExecuteNonQuery();
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return num2;
        }

        /// <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)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                SqlParameter parameter = new SqlParameter("@content", SqlDbType.NText)
                {
                    Value = content
                };
                command.Parameters.Add(parameter);
                try
                {
                    connection.Open();
                    object objA = command.ExecuteScalar();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    command.Dispose();
                    connection.Close();
                }
            }
            return obj3;
        }

        /// <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)
        {
            int num2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(strSQL, connection);
                SqlParameter parameter = new SqlParameter("@fs", SqlDbType.Image)
                {
                    Value = fs
                };
                command.Parameters.Add(parameter);
                try
                {
                    connection.Open();
                    num2 = command.ExecuteNonQuery();
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    command.Dispose();
                    connection.Close();
                }
            }
            return num2;
        }

        /// <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)
        {
            int num3;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();
                SqlCommand command = new SqlCommand
                {
                    Connection = connection
                };
                SqlTransaction transaction = connection.BeginTransaction();
                command.Transaction = transaction;
                try
                {
                    int num = ;
                    for (int i = ; i < SQLStringList.Count; i++)
                    {
                        string str = SQLStringList[i];
                        if (str.Trim().Length > )
                        {
                            command.CommandText = str;
                            num += command.ExecuteNonQuery();
                        }
                    }
                    transaction.Commit();
                    num3 = num;
                }
                catch
                {
                    transaction.Rollback();
                    num3 = ;
                }
            }
            return num3;
        }

        /// <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 connection = new SqlConnection(connectionString))
            {
                connection.Open();
                using (SqlTransaction transaction = connection.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        foreach (DictionaryEntry entry in SQLStringList)
                        {
                            string cmdText = entry.Key.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])entry.Value;
                            PrepareCommand(cmd, connection, transaction, cmdText, cmdParms);
                            cmd.ExecuteNonQuery();
                            cmd.Parameters.Clear();
                        }
                        transaction.Commit();
                    }
                    catch
                    {
                        transaction.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 connection = new SqlConnection(connectionString))
            {
                connection.Open();
                using (SqlTransaction transaction = connection.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int num = ;
                        foreach (DictionaryEntry entry in SQLStringList)
                        {
                            string cmdText = entry.Key.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])entry.Value;
                            foreach (SqlParameter parameter in cmdParms)
                            {
                                if (parameter.Direction == ParameterDirection.InputOutput)
                                {
                                    parameter.Value = num;
                                }
                            }
                            PrepareCommand(cmd, connection, transaction, cmdText, cmdParms);
                            cmd.ExecuteNonQuery();
                            foreach (SqlParameter parameter2 in cmdParms)
                            {
                                if (parameter2.Direction == ParameterDirection.Output)
                                {
                                    num = Convert.ToInt32(parameter2.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        transaction.Commit();
                    }
                    catch
                    {
                        transaction.Rollback();
                        throw;
                    }
                }
            }
        }

        public static bool Exists(string strSql)
        {
            int num;
            object single = GetSingle(strSql);
            if (object.Equals(single, null) || object.Equals(single, DBNull.Value))
            {
                num = ;
            }
            else
            {
                num = int.Parse(single.ToString());
            }
            if (num == )
            {
                return false;
            }
            return true;
        }

        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            int num;
            object single = GetSingle(strSql, cmdParms);
            if (object.Equals(single, null) || object.Equals(single, DBNull.Value))
            {
                num = ;
            }
            else
            {
                num = int.Parse(single.ToString());
            }
            if (num == )
            {
                return false;
            }
            return true;
        }

        /// <summary>
        /// 得到指定列的最大值
        /// </summary>
        /// <param name="FieldName">列名</param>
        /// <param name="TableName">表名</param>
        /// <returns>最大值</returns>
        public static int GetMaxID(string FieldName, string TableName)
        {
            return GetMaxID(FieldName, TableName, "");
        }

        /// <summary>
        /// 得到指定条件、指定列的最大值
        /// </summary>
        /// <param name="FieldName">列名</param>
        /// <param name="TableName">表名</param>
        /// <param name="strWhere">条件</param>
        /// <returns></returns>
        public static int GetMaxID(string FieldName, string TableName, string strWhere)
        {
            string sQLString = "select max(" + FieldName + ")+1 from " + TableName;
            if (!string.IsNullOrEmpty(strWhere))
            {
                sQLString = sQLString + " Where " + strWhere;
            }
            object single = GetSingle(sQLString);
            if (single == null)
            {
                return ;
            }
            return int.Parse(single.ToString());
        }

        /// <summary>
        /// 得到指定条件、指定列的最大值
        /// </summary>
        /// <param name="FieldName">列名</param>
        /// <param name="TableName">表名</param>
        /// <param name="strWhere">条件</param>
        /// <returns></returns>
        public static long GetMaxIDLong(string FieldName, string TableName, string strWhere)
        {
            string sQLString = "select max(" + FieldName + ")+1 from " + TableName;
            if (!string.IsNullOrEmpty(strWhere))
            {
                sQLString = sQLString + " Where " + strWhere;
            }
            object single = GetSingle(sQLString);
            if (single == null)
            {
                return 1L;
            }
            return long.Parse(single.ToString());
        }

        /// <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)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    object objA = command.ExecuteScalar();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return obj3;
        }

        /// <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)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    object objA = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    if (cmd != null)
                    {
                        cmd.Dispose();
                    }
                }
            }
            return obj3;
        }

        public static object GetSingle(string SQLString, int Times)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    command.CommandTimeout = Times;
                    object objA = command.ExecuteScalar();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return obj3;
        }

        public static object GetSingle(string SQLString, string _connectionString)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    object objA = command.ExecuteScalar();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return obj3;
        }

        public static object GetSingle(string SQLString, string _connectionString, int Times)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                SqlCommand command = new SqlCommand(SQLString, connection);
                try
                {
                    connection.Open();
                    command.CommandTimeout = Times;
                    object objA = command.ExecuteScalar();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    connection.Close();
                    throw exception;
                }
                finally
                {
                    if (command != null)
                    {
                        command.Dispose();
                    }
                }
            }
            return obj3;
        }

        public static object GetSingle(string SQLString, string _connectionString, params SqlParameter[] cmdParms)
        {
            object obj3;
            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                try
                {
                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                    object objA = cmd.ExecuteScalar();
                    cmd.Parameters.Clear();
                    if (object.Equals(objA, null) || object.Equals(objA, DBNull.Value))
                    {
                        return null;
                    }
                    obj3 = objA;
                }
                catch (SqlException exception)
                {
                    throw exception;
                }
                finally
                {
                    if (cmd != null)
                    {
                        cmd.Dispose();
                    }
                }
            }
            return obj3;
        }

        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;
            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);
                }
            }
        }

        /// <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 dataSet = new DataSet();
                try
                {
                    connection.Open();
                    new SqlDataAdapter(SQLString, connection).Fill(dataSet, "ds");
                }
                catch (SqlException exception)
                {
                    throw new Exception(exception.Message);
                }
                return dataSet;
            }
        }

        /// <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)
        {
            DataSet set2;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))
                {
                    DataSet dataSet = new DataSet();
                    try
                    {
                        adapter.Fill(dataSet, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (SqlException exception)
                    {
                        throw new Exception(exception.Message);
                    }
                    set2 = dataSet;
                }
            }
            return set2;
        }

        public static DataSet Query(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                try
                {
                    connection.Open();
                    new SqlDataAdapter(SQLString, connection) { SelectCommand = { CommandTimeout = Times } }.Fill(dataSet, "ds");
                }
                catch (SqlException exception)
                {
                    throw new Exception(exception.Message);
                }
                return dataSet;
            }
        }

        public static DataSet Query(string SQLString, string _connectionString)
        {
            using (SqlConnection connection = new SqlConnection(_connectionString))
            {
                DataSet dataSet = new DataSet();
                try
                {
                    connection.Open();
                    new SqlDataAdapter(SQLString, connection).Fill(dataSet, "ds");
                }
                catch (SqlException exception)
                {
                    throw new Exception(exception.Message);
                }
                return dataSet;
            }
        }

        /// <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);
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            return command.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <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();
                new SqlDataAdapter { SelectCommand = BuildQueryCommand(connection, storedProcName, parameters) }.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        /// <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))
            {
                connection.Open();
                SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
                rowsAffected = command.ExecuteNonQuery();
                return (int)command.Parameters["ReturnValue"].Value;
            }
        }

        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 adapter = new SqlDataAdapter
                {
                    SelectCommand = BuildQueryCommand(connection, storedProcName, parameters)
                };
                adapter.SelectCommand.CommandTimeout = Times;
                adapter.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        /// <summary>
        /// Runs the procedure.
        /// </summary>
        /// <param name="storedProcName">Name of the stored proc.</param>
        /// <param name="parameters">The parameters.</param>
        /// <param name="tableName">Name of the table.</param>
        /// <param name="connstr">The connstr.</param>
        /// <returns></returns>
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, string connstr)
        {
            using (SqlConnection connection = new SqlConnection(connstr))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                new SqlDataAdapter { SelectCommand = BuildQueryCommand(connection, storedProcName, parameters) }.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }

        /// <summary>
        /// 表是否存在
        /// </summary>
        /// <param name="TableName"></param>
        /// <returns></returns>
        public static bool TabExists(string TableName)
        {
            int num;
            object single = GetSingle("select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1");
            if (object.Equals(single, null) || object.Equals(single, DBNull.Value))
            {
                num = ;
            }
            else
            {
                num = int.Parse(single.ToString());
            }
            if (num == )
            {
                return false;
            }
            return true;
        }

    }
}