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

{

/// <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();

}

}

}

}

}

-----------------------------

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;

}