using System;
using System.Data;
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;
using System.Data.SqlClient;
namespace Mysqlserver
{
  /// <summary>
  /// SqlServerDataBase 的摘要說明
  /// </summary>
  public class SqlServerDataBase
  {
    private string strError = null;
    private int intCount = 0;
    public SqlServerDataBase()
    {
      //
      // TODO: 在此處添加構(gòu)造函數(shù)邏輯
      //
    }
    /// <summary>
    /// 公開方法DBConn，返回?cái)?shù)據(jù)庫(kù)連接
    /// </summary>
    /// <returns></returns>
    public SqlConnection DBconn()
    {
      string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";
      try
      {
        return new SqlConnection(strConn);
      }
      catch (Exception)
      {
        return null;
      }
    }
    /// <summary>
    /// 公開屬性ErrorMessage，返回錯(cuò)誤信息
    /// </summary>
    public string ErrorMessage
    {
      get
      {
        return strError;
      }
    }
    /// <summary>
    /// 根據(jù)查詢語句從數(shù)據(jù)庫(kù)檢索數(shù)據(jù)
    /// </summary>
    /// <param name="strSelect">查詢語句</param>
    /// <param name="SqlConn">數(shù)據(jù)庫(kù)連接</param>
    /// <returns>有數(shù)據(jù)則返回DataSet對(duì)象，否則返回null</returns>
    public DataSet Select(string SelectString, SqlConnection sqlConn)
    {
      strError = "";
      SqlConnection conn;
      if (sqlConn == null)
      {
        conn = DBconn();
      }
      else
      {
        conn = sqlConn;
      }
      try
      {
        //若數(shù)據(jù)庫(kù)連接的當(dāng)前狀態(tài)是關(guān)閉的，則打開連接
        if (conn.State == ConnectionState.Closed)
        {
          conn.Open();
        }
        SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
        SqlCommand selectCommand = new SqlCommand(SelectString, conn);
        selectCommand.CommandType = CommandType.Text;
        mySqlDataAdapter.SelectCommand = selectCommand;
        DataSet myDS = new DataSet();
        mySqlDataAdapter.Fill(myDS);
        return myDS;
      }
      catch (Exception e)
      {
        strError = "數(shù)據(jù)檢索失敗：" + e.Message;
        return null;
      }
      finally
      {
        if (conn.State != ConnectionState.Closed)
        {
          conn.Close();
        }
      }
    }
    /// <summary>
    /// 更新數(shù)據(jù)庫(kù)
    /// </summary>
    /// <param name="UpdateString">Update Sql語句</param>
    /// <param name="SqlConn">數(shù)據(jù)庫(kù)連接</param>
    /// <returns>更新成功返回true</returns>
    public bool Update(string UpdateString, SqlConnection SqlConn)
    {
      return udiDataBase(UpdateString, SqlConn);
    }
    /// <summary>
    /// 從數(shù)據(jù)庫(kù)中刪除數(shù)據(jù)
    /// </summary>
    /// <param name="DeleteString">Delete Sql語句</param>
    /// <param name="SqlConn">數(shù)據(jù)庫(kù)連接</param>
    /// <returns>刪除成功返回true</returns>
    public bool Delete(string DeleteString, SqlConnection SqlConn)
    {
      return udiDataBase(DeleteString, SqlConn);
    }
    /// <summary>
    /// 把數(shù)據(jù)插入數(shù)據(jù)庫(kù)
    /// </summary>
    /// <param name="InsertString">Insert Sql語句</param>
    /// <param name="SqlConn">數(shù)據(jù)庫(kù)連接</param>
    /// <returns>插入成功返回true</returns>
    public bool Insert(string InsertString, SqlConnection SqlConn)
    {
      return udiDataBase(InsertString, SqlConn);
    }
    /// <summary>
    /// 根據(jù)Sql語句更新數(shù)據(jù)庫(kù)
    /// </summary>
    /// <param name="UDIString">更新語句</param>
    /// <param name="SqlConn">數(shù)據(jù)庫(kù)連接</param>
    /// <returns>更新成功則返回true</returns>
    public bool udiDataBase(string UDIString, SqlConnection SqlConn)
    {
      strError = "";
      SqlConnection conn;
      if (SqlConn == null)
      {
        conn = DBconn();
      }
      else
      {
        conn = SqlConn;
      }
      try
      {
        if (conn.State == ConnectionState.Closed)
        {
          conn.Open();
        }
        SqlCommand cmd = new SqlCommand(UDIString, conn);
        cmd.CommandType = CommandType.Text;
        intCount = cmd.ExecuteNonQuery();
        return !(intCount < 1);
      }
      catch (Exception e)
      {
        strError = "更新數(shù)據(jù)庫(kù)失敗：" + e.Message;
        return false;
      }
      finally
      {
        if (conn.State != ConnectionState.Closed)
        {
          conn.Close();
        }
      }
    }
  }
}