Asp.net(c#)数据库操作类

wzhlxf 贡献于2013-01-08

作者 lee  创建于2010-04-26 05:20:00   修改者lee  修改于2010-04-26 05:21:00字数3656

文档摘要:Asp.net(c#)数据库操作类
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Asp.net(c#)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 { /// /// SqlServerDataBase 的摘要说明 /// public class SqlServerDataBase { private string strError = null; private int intCount = 0; public SqlServerDataBase() { // // TOD 在此处添加构造函数逻辑 // } /// /// 公开方法DBConn,返回数据库连接 /// /// public SqlConnection DBconn() { string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd="; try { return new SqlConnection(strConn); } catch (Exception) { return null; } } /// /// 公开属性ErrorMessage,返回错误信息 /// public string ErrorMessage { get { return strError; } } /// /// 根据查询语句从数据库检索数据 /// /// 查询语句 /// 数据库连接 /// 有数据则返回DataSet对象,否则返回null 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(); } } } /// /// 更新数据库 /// /// Update Sql语句 /// 数据库连接 /// 更新成功返回true public bool Update(string UpdateString, SqlConnection SqlConn) { return udiDataBase(UpdateString, SqlConn); } /// /// 从数据库中删除数据 /// /// Delete Sql语句 /// 数据库连接 /// 删除成功返回true public bool Delete(string DeleteString, SqlConnection SqlConn) { return udiDataBase(DeleteString, SqlConn); } /// /// 把数据插入数据库 /// /// Insert Sql语句 /// 数据库连接 /// 插入成功返回true public bool Insert(string InsertString, SqlConnection SqlConn) { return udiDataBase(InsertString, SqlConn); } /// /// 根据Sql语句更新数据库 /// /// 更新语句 /// 数据库连接 /// 更新成功则返回true 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(); } } } } } ----------------------------- 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; }

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