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

namespace DAL
{
    public class SQLHelper
    {

        private SqlConnection conn =null;
        private SqlCommand cmd = null;
        private SqlDataReader sdr = null;

        public SQLHelper()
        {
            string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
            conn = new SqlConnection(connStr);
        }

        private SqlConnection GetConn()
        {
            if (conn.State==ConnectionState.Closed)
            {
                conn.Open();
            }
            return conn;
        }

        /// 

        /// 执行不带参数的增删改查SQL语句或存储过程
        /// 
        /// 不带参数的增删改查SQL语句或存储过程
        /// 命令类型
        /// 

        public int ExecuteNonQuery(string cmdText,CommandType ct)
        {
            int res;
            using (cmd = new SqlCommand(cmdText, GetConn()))
            {
                cmd.CommandType = ct;
                res = cmd.ExecuteNonQuery();
            }
            return res;
        }

        /// 

        /// 执行带参数的SQL增删改查或存储过程
        /// 
        /// 参数的SQL增删改查或存储过程
        /// 参数集合
        /// 命令类型
        /// 

        public int ExecuteNonQuery(string cmdText,SqlParameter[] paras,CommandType ct)
        {
            int res;
            using (cmd = new SqlCommand(cmdText, GetConn()))
            {

                cmd.Parameters.AddRange(paras);
                cmd.CommandType = ct;
                res = cmd.ExecuteNonQuery();
            }
            return res;
        }

        /// 

        /// 执行带参数的增删改SQL语句或存储过程
        /// 
        /// 带参数的增删改SQL语句或存储过程
        /// 命令类型
        /// 

        public DataTable ExecuteQuery(string cmdText,CommandType ct)
        {
            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdText, GetConn());
            cmd.CommandType = ct;
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }

       /// 

        /// 执行带参数的SQL查询语句
       /// 
        /// 带参数的SQL查询语句
        /// 参数集合
       /// 执行类型
        /// 

 DataTable

        public DataTable ExecuteQuery(string cmdText, SqlParameter[] paras,CommandType ct)
        {
            DataTable dt = new DataTable();
            cmd = new SqlCommand(cmdText, GetConn());
            cmd.Parameters.AddRange(paras);
            cmd.CommandType = ct;
            using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
            {
                dt.Load(sdr);
            }
            return dt;
        }

        /// 

        /// ExecuteScalar--返回首行首列 
        /// 
        /// sql语句
        /// 

 返回
 结果集的首行首列

        public int GetRecordCount(string XSqlString)
        {
            string SCount;

            SqlCommand Cmd = new SqlCommand(XSqlString, GetConn());
            SCount = Cmd.ExecuteScalar().ToString().Trim(); //返回结果集的首行首列,忽略其它
            if (SCount == "")
                SCount = "0";

            return Convert.ToInt32(SCount);
        }

}
}