ASP.NET数据库操作类实例

本文实例讲述了ASP.NET数据库操作类。分享给大家供大家参考，具体如下：

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()
    {
      //
      // TODO: 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();
 }
      }
    }
  }
}

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