ASP.NET数据库操作类实例

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();
 }
 }
 }
 }
}