SQLHELPER C#

个人开发:

<appSettings>
  <add key="conindex" value="1"/>
  <add key="sqlconstr" value="server=.\SQLEXPRESS;database=MyOffice;uid=sa;pwd=zqmingok"/>
  <add key="OLEDBCONNECTIONSTRING" value="provider=microsoft.jet.oledb.4.0;data source="/>
  <add key="dbPath" value="~/App_Data/Data.mdb"/>
  
 </appSettings>

Code
using System;
using System.Data;
using System.Data.OleDb;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;


public class SQLHelper
{
    private static string keystr = ConfigurationManager.AppSettings[0].ToString();
    private int conindex = Convert.ToInt32(keystr);
    private SqlConnection sqlcon = null;
    private SqlCommand sqlcom = null;
    private SqlDataReader sdr = null;
    /// <summary>
    /// 初始化方法
    /// </summary>
    public SQLHelper()
    {
        //string constr=ConfigurationManager.ConnectionStrings[1].ConnectionString;
        sqlcon = new SqlConnection(getConStr(1));

    }
    /// <summary>
    /// 获取数据库连接字段
    /// </summary>
    /// <param name="conindex">web.config中的配制字符串按顺序分别为0,1,2,3.</param>
    /// <returns>返回数据库连接字符串</returns>
    private string getConStr(int Tindex)
    {
        if (Tindex == 1 || Tindex == 2)
        {
            if (Tindex == 1)
            {
                string sqlconstr = ConfigurationManager.AppSettings[1].ToString();
                return sqlconstr;
            }
            else
            {
                string oledconstr = ConfigurationManager.AppSettings[2].ToString();
                string oleddbstr = System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings[3].ToString());
                return oledconstr + oleddbstr;
            }
        }
        else
        {
            return null;
        }
    }
    /// <summary>
    /// 执行增删改操作
    /// </summary>
    /// <param name="sql">传入的SQL</param>
    /// <returns>返回影响的行数</returns>
    public int ExecuteNonQuery(string sql)
    {
        int res;
        try
        {
            sqlcom = new SqlCommand(sql, getCon());
            res = sqlcom.ExecuteNonQuery();

        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            closecon();
        }

        return res;
    }
    public int ExecuteNonQuery(string sql, SqlParameter[] paras)
    {
        int res;
        try
        {
            sqlcom = new SqlCommand(sql, getCon());
            sqlcom.Parameters.AddRange(paras);
            res = sqlcom.ExecuteNonQuery();

        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            closecon();
        }

        return res;
    }

    /// <summary>
    /// 执行查询
    /// </summary>
    /// <param name="sql">传入SQL</param>
    /// <returns>返回TABLE</returns>
    public DataTable ExecuteQuery(string sql)
    {
        DataTable dt = new DataTable();

        sqlcom = new SqlCommand(sql, getCon());
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { dt.Load(sdr); }
        closecon();
        return dt;
    }
    public DataTable ExecuteQuery(string sql, SqlParameter[] paras)
    {
        DataTable dt = new DataTable();

        sqlcom = new SqlCommand(sql, getCon());
        sqlcom.Parameters.AddRange(paras);
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { dt.Load(sdr); }
        closecon();
        return dt;
    }
    /// <summary>
    /// datereader
    /// </summary>
    /// <param name="sql"></param>
    /// <returns></returns>
    public SqlDataReader ExecuteDataReaderQuery(string sql)
    {


        sqlcom = new SqlCommand(sql, getCon());
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { return sdr; }
        closecon();

    }
    public SqlDataReader ExecuteDataReaderQuery(string sql, SqlParameter[] paras)
    {


        sqlcom = new SqlCommand(sql, getCon());
        sqlcom.Parameters.AddRange(paras);
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { return sdr; }
        closecon();

    }

    /// <summary>
    /// 执行PROCEDURE 
    /// </summary>
    /// <param name="proc"></param>
    /// <returns></returns>
    public DataTable ExecuteQueryProc(string proc)
    {
        DataTable dt = new DataTable();

        sqlcom = new SqlCommand(proc, getCon());
        sqlcom.CommandType = CommandType.StoredProcedure;
        //   sqlcom.Parameters.AddRange(paras);
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { dt.Load(sdr); }
        closecon();
        return dt;
    }
    public DataTable ExecuteQueryProc(string proc, SqlParameter[] paras)
    {
        DataTable dt = new DataTable();

        sqlcom = new SqlCommand(proc, getCon());
        sqlcom.CommandType = CommandType.StoredProcedure;
        sqlcom.Parameters.AddRange(paras);
        using (sdr = sqlcom.ExecuteReader(CommandBehavior.CloseConnection))
        { dt.Load(sdr); }
        closecon();
        return dt;
    }
    public int ExecuteNonQueryProc(string proc)
    {
        int res;
        try
        {
            sqlcom = new SqlCommand(proc, getCon());
            sqlcom.CommandType = CommandType.StoredProcedure;
            res = sqlcom.ExecuteNonQuery();

        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            closecon();
        }

        return res;
    }
    public int ExecuteNonQueryProc(string proc, SqlParameter[] paras)
    {
        int res;
        try
        {
            sqlcom = new SqlCommand(proc, getCon());
            sqlcom.CommandType = CommandType.StoredProcedure;
            sqlcom.Parameters.AddRange(paras);
            res = sqlcom.ExecuteNonQuery();

        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            closecon();
        }

        return res;
    }

    /// <summary>
    /// 得到相关CONNECTION
    /// </summary>
    /// <returns></returns>
    private SqlConnection getCon()
    {
        if (sqlcon.State == ConnectionState.Closed)
        {
            sqlcon.Open();
        }

        return sqlcon;
    }

    /// <summary>
    /// 关闭连接的对象
    /// </summary>
    private void closecon()
    {
        if (sqlcon.State == ConnectionState.Open)
        {
            sqlcon.Close();
        }


    }
}