SQLhelper帮助类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;

namespace Utility
{
    public class SQLHelper
    {
        #region 通用方法
        // 数据连接池 
        private SqlConnection con;
        private string _message;
        string _Message = string.Empty;
        public string Message
        {
            get { return _message; }
            set { _message = value; }
        }
        private CommandType _SQLCommandType = CommandType.Text;
        /// 

        /// 命令类型
        /// 
        public CommandType SQLCommandType
        {
            get { return this._SQLCommandType; }
            set { this._SQLCommandType = value; }
        }
        /// 

        /// 返回数据库连接字符串
        /// 
        /// 
        public static String GetSqlConnection()
        {
            string connString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnStrPool"].ConnectionString;
            return connString;
        }
        #endregion

        #region 执行sql字符串
        /// 

        /// 执行不带参数的SQL语句
        /// 
        /// 
        /// 
        public static int ExecuteSql(String StrSql)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection conn = new SqlConnection(ConnStr))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = StrSql;
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
                return 1;
            }
        }

        /// 

        /// cyj 2012 7 4
        /// 验证数据是否存在
        /// 
        /// 
        /// 
        /// 
        public bool ValiExist(string sql, SqlParameter[] param)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection con = new SqlConnection(ConnStr))
            {
                con.Open();
                SqlCommand cmd = new SqlCommand(sql, con);
                if (param != null)
                    cmd.Parameters.AddRange(param);
                using (SqlDataReader dr = cmd.ExecuteReader())
                {
                    if (dr.Read())
                    {
                        con.Close();
                        return true;
                    }
                    else
                    {
                        con.Close();
                        return false;
                    }

                }
            }
        }

        /// 

        /// 执行不带参数的SQL语句(替换上面的方法。暂时保留上面的方法，是为了与旧系统能兼容) 
        /// 作者：Duke
        /// 时间：2012.2.6
        /// 改写目的：程序出错时，不崩溃，并能给出友好的提示信息
        /// 改写方法：
        /// 1、取消静态方法（不方便出错信息等属性读取）
        /// 2、加入try结构
        /// 3、封闭类的消息属性 
        /// 
        /// 
        /// 
        public int ExecuteSqlNoPa(String StrSql)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection conn = new SqlConnection(ConnStr))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = StrSql;
                try
                {
                    conn.Open();
                    return cmd.ExecuteNonQuery();
                }
                catch (SqlException ex)
                {
                    this.Message = ex.Message;
                    return 0;
                }
                finally
                {
                    conn.Close();
                }
            }
        }

        /// 

        /// 执行带参数的SQL语句
        /// 作者：Duke
        /// 时间：2012.2.2
        /// 改写目的：程序出错时，不崩溃，并能给出友好的提示信息
        /// 改写方法：
        /// 1、取消静态方法（不方便出错信息等属性读取）
        /// 2、加入try结构
        /// 3、封闭类的消息属性
        /// 
        /// 
        /// 
        /// 
        public  int ExecuteSql(String StrSql, SqlParameter[] param)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection conn = new SqlConnection(ConnStr))
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = StrSql;
                cmd.Parameters.AddRange(param);
                try
                {
                    conn.Open();
                    return cmd.ExecuteNonQuery();
                }
                catch (SqlException ex)
                {

                    this.Message = ex.Message;
                    return 0;
                }
                finally
                {
                    conn.Close();
                }
            }
        }

        /// 

        /// 返回DataReader
        /// 
        /// 
        ///  
        public static SqlDataReader ExecuteReader(String StrSql)
        {
            String ConnStr = GetSqlConnection();
            SqlConnection conn = new SqlConnection(ConnStr);//返回DataReader时,是不可以用using()的 
            try
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = StrSql;
                conn.Open();
                return cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);//关闭关联的Connection 
            }
            catch //(Exception ex) 
            {
                return null;
            }
            finally
            {
                conn.Close();
            }
        }

        /// 

        /// 获取单个值
        /// 
        /// 
        /// 
        public object ExecScalar(string selectSQL)
        {
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = GetSqlConnection();
            SqlCommand command = new SqlCommand(selectSQL, conn);
            try
            {
                conn.Open();
                return command.ExecuteScalar();
            }
            catch (SqlException ex)
            {
                Message = ex.Message;
                return null;
            }
            finally
            {
                conn.Close();
            }
        }

        /// 

        /// 执行SQL语句并返回数据表
        /// 
        /// 
        /// 
        public static DataTable ExecuteDt(String StrSql)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection conn = new SqlConnection(ConnStr))
            {
                SqlDataAdapter da = new SqlDataAdapter(StrSql, conn);
                DataTable dt = new DataTable();
                conn.Open();
                da.Fill(dt);
                conn.Close();
                return dt;
            }
        }

        /// 

        /// 执行SQL语句并返回DataSet
        /// 
        /// 
        /// 
        public static DataSet ExecuteDs(String StrSql)
        {
            String ConnStr = GetSqlConnection();
            using (SqlConnection conn = new SqlConnection(ConnStr))
            {
                SqlDataAdapter da = new SqlDataAdapter(StrSql, conn);
                DataSet ds = new DataSet();
                conn.Open();
                da.SelectCommand.CommandTimeout = 180;
                da.Fill(ds);
                conn.Close();
                return ds;
            }
        }

        /// 

        /// 获取结果集（含参数）
        /// 
        /// Select语句或者存储过程名称
        /// 参数列表
        /// 
        public DataTable Select(string selectSQL, System.Data.SqlClient.SqlParameter[] paramList)
        {

            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = GetSqlConnection();

            SqlCommand command = new SqlCommand(selectSQL);
            command.CommandType = this.SQLCommandType;
            command.Parameters.AddRange(paramList);
            command.Connection = conn;

            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataTable ds = new DataTable();
            try
            {
                conn.Open();
                adapter.Fill(ds);
            }
            catch (SqlException ex)
            {
                Message = ex.Message;
            }
            finally
            {
                conn.Close();
            }
            return ds;
        }

        #endregion

        #region 操作存储过程
        /// 

        /// 调用存储过程（有参数）
        /// 
        /// 
        /// 
        /// -1:失败
        public int CallProcedure(string name, System.Data.Common.DbParameter[] paramList)
        {
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = GetSqlConnection();

            SqlCommand command = new SqlCommand(name);
            command.CommandType = System.Data.CommandType.StoredProcedure;
            command.Parameters.AddRange(paramList);
            command.Connection = conn;
            try
            {
                conn.Open();
                return command.ExecuteNonQuery();
            }
            catch (SqlException ex)
            {
                Message = ex.Message;
                return -1;
            }
            finally
            {
                conn.Close();
            }
        }

        /// 

        /// 调用存储过程（无参数）
        /// 
        /// 
        /// 
        /// -1:失败
        public int CallProcedure(string name)
        {
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = GetSqlConnection();

            SqlCommand command = new SqlCommand(name);
            command.CommandType = System.Data.CommandType.StoredProcedure;
            command.Connection = conn;
            try
            {
                conn.Open();
                return command.ExecuteNonQuery();
            }
            catch (SqlException ex)
            {
                this._Message = ex.Message;
                return -1;
            }
            finally
            {
                conn.Close();
            }
        }

        /// 

        /// 运行存储过程(已重载) 
        /// 
        /// 存储过程名
        /// 
        public int RunProc(string procName)
        {
            SqlCommand cmd = CreateCommand(procName, null);
            cmd.ExecuteNonQuery();
            this.Close();
            return (int)cmd.Parameters["ReturnValue"].Value;
        }

        /// 

        /// 运行存储过程(已重载)
        /// 
        /// 存储过程的名字
        /// 存储过程的输入参数列表
        /// 存储过程的返回值
        public int RunProc(string procName, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateCommand(procName, prams);

            cmd.ExecuteNonQuery();
            this.Close();
            return (int)cmd.Parameters[0].Value;
        }

        /// 

        /// 运行存储过程(已重载)
        /// 
        /// 存储过程名
        /// 结果集
        public void RunProc(string procName, out SqlDataReader dataReader)
        {
            SqlCommand cmd = CreateCommand(procName, null);
            dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
        }

        /// 

        /// 运行存储过程(已重载)
        /// 
        /// 存储过程的名字
        /// 存储过程的输入参数列表
        /// 结果集
        public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader)
        {
            SqlCommand cmd = CreateCommand(procName, prams);
            dataReader = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);
        }

        /// 

        /// 创建Command对象用于访问存储过程
        /// 
        /// 存储过程的名字
        /// 存储过程的输入参数列表
        /// Command对象
        private SqlCommand CreateCommand(string procName, SqlParameter[] prams)
        {
            // 确定连接是打开的 
            Open();
            //command = new SqlCommand( sprocName, new SqlConnection( ConfigManager.DALConnectionString ) ); 
            SqlCommand cmd = new SqlCommand(procName, con);
            cmd.CommandType = CommandType.StoredProcedure;
            // 添加存储过程的输入参数列表 
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams) cmd.Parameters.Add(parameter);
            }
            // 返回Command对象 
            return cmd;
        }

        /// 

        /// 创建输入参数
        /// 
        /// 参数名
        /// 参数类型
        /// 参数大小
        /// 参数值
        /// 新参数对象
        public SqlParameter MakeInParam(string ParamName, SqlDbType DbType, int Size, object Value)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
        }

        /// 

        /// 创建输出参数
        /// 
        /// 参数名
        /// 参数类型
        /// 参数大小
        /// 新参数对象
        public SqlParameter MakeOutParam(string ParamName, SqlDbType DbType, int Size)
        {
            return MakeParam(ParamName, DbType, Size, ParameterDirection.Output, null);
        }
        /// 

        /// 创建存储过程参数
        /// 
        /// 参数名
        /// 参数类型
        /// 参数大小
        /// 参数的方向(输入/输出)
        /// 参数值
        /// 新参数对象
        public SqlParameter MakeParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;
            if (Size > 0)
            {
                param = new SqlParameter(ParamName, DbType, Size);
            }
            else
            {
                param = new SqlParameter(ParamName, DbType);
            }
            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
            {
                param.Value = Value;
            }
            return param;
        }
        #endregion

        #region 数据库连接和关闭

        public void OpenAdd()
        {
            Open();
        }
        /// 

        /// 打开连接池
        /// 
        private void Open()
        {
            // 打开连接池 
            if (con == null)
            {
                //这里不仅需要using System.Configuration;还要在引用目录里添加 
                con = new SqlConnection(GetSqlConnection());
                con.Open();
            }
        }

        /// 

        /// 关闭连接池
        /// 
        public void Close()
        {
            if (con != null)
                con.Close();
        }

        /// 

        /// 释放连接池
        /// 
        public void Dispose()
        {
            // 确定连接已关闭 
            if (con != null)
            {
                con.Dispose();
                con = null;
            }
        }

        #endregion
    }
}