我开始学习C#(SQL库)了数据类

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.UI.WebControls;
namespace ctest
//科长-2006-07-write
{
/// <summary>
/// dbconn 的摘要说明。
/// </summary>
public class dbconn
{
/// <summary>
/// 返回一个AppSettings的值
/// </summary>
/// <param name="Appstr">AppSettingsr的名字</param>
/// <returns></returns>
public static string GetApp(string Appstr)
{
return ConfigurationSettings.AppSettings[Appstr];
}
/// <summary>
/// 创建SQL连接
/// </summary>
public static SqlConnection CreateSqlConnection()
{
SqlConnection myConnection = new SqlConnection( GetApp("ConnString"));
myConnection.Open();
return myConnection;
}

/// <summary>
/// 执行SQL语句
/// </summary>
/// <param name="SQl">要执行的SQL语句</param>
public static void dosql(string strsql )
{
SqlConnection conn=CreateSqlConnection();
SqlCommand myCommand=new SqlCommand(strsql,conn);
myCommand.ExecuteNonQuery();
conn.Close();
}

/// <summary>
/// 更新和删除SQL语句
/// </summary>
/// <param name="sql">SQL语句</param>
/// <returns>BOOL是否执行成功</returns>
public static bool ExecuteUpdate(string sql)
{
try
{
SqlCommand dCom=new SqlCommand();
dCom.CommandText = sql;
int flag = dCom.ExecuteNonQuery();
if(flag != -1)
{
return true;
}
else
{
return false;
}
}
catch//(Exception ex)
{
return false;
}
}

/// <summary>
/// 传入SQL语句，返回一个DataSet类型的数据表集合
/// </summary>
/// <param name="strsql">SQL语句字符串</param>
/// <returns>dataset</returns>
public static DataSet GETdataset (string strsql)
{
SqlConnection conn=CreateSqlConnection();
SqlDataAdapter dApter = new SqlDataAdapter(strsql,conn);
DataSet DS = new DataSet();
dApter.Fill(DS);
conn.Close();
return DS;
}
/// <summary>
/// 传入SQL语句返回一个DataTable
/// </summary>
/// <param name="strsql">SQL语句</param>
/// <returns></returns>
public static DataTable GetDataTable(string strsql)
{

SqlConnection conn=CreateSqlConnection();
SqlDataAdapter DataAdapter1 = new SqlDataAdapter(strsql, conn);
DataSet DS=new DataSet();
DataAdapter1.Fill(DS);
conn.Close();
return DS.Tables[0];
}

/// <summary>
/// 传入SQL语句，DataGrid数据帮定
/// </summary>
/// <param name="intPageNumber">分页数</param>
/// <param name="DG_name">DataGrid名称</param>
/// <param name="strsql">SQL语句</param>
public static void BindDataGrid (int intPageNumber,DataGrid DG_name,string strsql )
{
// ----------- 数据库连接 -----------
SqlConnection conn=CreateSqlConnection();
/* // 方法一
SqlCommand myCommand = new SqlCommand(SqlCmd, myConnection);
SqlDataAdapter sqlDataAdapter1 = new SqlDataAdapter();
sqlDataAdapter1.SelectCommand = myCommand;
DataSet ds1= new DataSet();
sqlDataAdapter1.SelectCommand.ExecuteNonQuery();
sqlDataAdapter1.Fill(ds1);
DataView source = new DataView(ds1.Tables[0]);
DataGrid1.DataSource=source;
DataGrid1.DataBind();
myConnection.Close();
*/
// 方法二
SqlDataAdapter DataAdapter1 = new SqlDataAdapter(strsql, conn);
DataSet ds = new DataSet();
DataAdapter1.Fill(ds);
try
{
DataTable DT = ds.Tables[0];
DG_name.DataSource = DT;
/*-----------------------------------------
* 翻页的时候要设置的就是下面这个属性
* ----------------------------------------*/
DG_name.CurrentPageIndex = intPageNumber;
DG_name.DataBind();
}
catch (SqlException ex)
{

}
finally
{
ds.Dispose();
ds.Clear();
DataAdapter1.Dispose();
conn.Close();
}
}

}

}