如何用C#写的ASP.NET数据库操作类

如何用C#写的ASP.NET数据库操作类，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

下面是用C#写的ASP.NET数据库操作类：

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 的摘要说明      /// < /summary>      public class SqlServerDataBase      {          private string strError = null;          private int intCount = 0;          public SqlServerDataBase()          {              //              // TODO: 在此处添加构造函数逻辑              //          }          /// < summary>          /// 公开方法DBConn，返回数据库连接          /// < /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>          /// 公开属性ErrorMessage，返回错误信息          /// < /summary>          public string ErrorMessage          {              get             {                  return strError;              }          }           /// < summary>          /// 根据查询语句从数据库检索数据          /// < /summary>          /// < param name="strSelect">查询语句< /param>            /// < param name="SqlConn">数据库连接< /param>          /// < returns>有数据则返回DataSet对象，否则返回null< /returns>          public DataSet Select(string SelectString, SqlConnection sqlConn)          {              strError = "";              SqlConnection conn;              if (sqlConn == null)              {                   conn = DBconn();              }              else             {                  conn = sqlConn;              }              try             {                  //若数据库连接的当前状态是关闭的，则打开连接                  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 = "数据检索失败：" + e.Message;                  return null;              }               finally             {                  if (conn.State != ConnectionState.Closed)                  {                      conn.Close();                  }              }          }          /// < summary>          /// 更新数据库          /// < /summary>          /// < param name="UpdateString">Update Sql语句< /param>          /// < param name="SqlConn">数据库连接< /param>          /// < returns>更新成功返回true< /returns>          public bool Update(string UpdateString, SqlConnection SqlConn)           {              return udiDataBase(UpdateString, SqlConn);          }          /// < summary>          /// 从数据库中删除数据          /// < /summary>          /// < param name="DeleteString">Delete Sql语句< /param>          /// < param name="SqlConn">数据库连接< /param>          /// < returns>删除成功返回true< /returns>          public bool Delete(string DeleteString, SqlConnection SqlConn)          {              return udiDataBase(DeleteString, SqlConn);          }          /// < summary>          /// 把数据插入数据库          /// < /summary>          /// < param name="InsertString">Insert Sql语句< /param>          /// < param name="SqlConn">数据库连接< /param>          /// < returns>插入成功返回true< /returns>          public bool Insert(string InsertString, SqlConnection SqlConn)          {              return udiDataBase(InsertString, SqlConn);          }          /// < summary>          /// 根据Sql语句更新数据库          /// < /summary>           /// < param name="UDIString">更新语句< /param>          /// < param name="SqlConn">数据库连接< /param>          /// < returns>更新成功则返回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 = "更新数据库失败：" + e.Message;                  return false;              }              finally             {                  if (conn.State != ConnectionState.Closed)                  {                      conn.Close();                  }              }          }      }  }

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ASP.NET数据库操作类写好了，下面是两种调用方法

1、

string strUserPsw = UserPsw.Text.Trim();  string UserPassWord = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strUserPsw, "MD5");//md5加密   SqlServerDataBase obj = new SqlServerDataBase();  obj.Insert("insert into asUserInfo (UserName,UserPassword,Question,Answer,CreateTime) values('" + UserName.Text.Trim() + "','" + UserPassword + "','" + Question.Text.Trim() + "','" + Answer.Text.Trim() + "','" + DateTime.Now.ToString() + "' )", null);

2、

private bool IsUsernameExist(string strUsername)  {      bool bRet = true;      SqlServerDataBase db = new SqlServerDataBase();       DataSet ds = db.Select("select * from asUserInfo where UserName = '" + strUsername + "'", null);      if (ds == null ds.Tables.Count == 0 ds.Tables[0].Rows.Count == 0)      {          bRet = false;      }      else     {          bRet = true;      }       return bRet;  }

以上就介绍了用C#写的ASP.NET数据库类及调用方法。

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