考慮到用戶可能更換SQL Server服務器,所以數據庫連接字符串不能寫成固定的。我們可以把它寫入一個文件,需要的時候訪問它即可以了。
下面的方法是把它寫入註冊表(寫入註冊表是爲了考慮到安全性,也可以寫入某個xml文件)
using Microsoft.Win32;
private void SetRegistryKey(string name,string connstr)
{
RegistryKey rk=Registry.LocalMachine;
RegistryKey srk=rk.OpenSubKey("software",true);
if(srk.OpenSubKey("Sunsoft/SunWebExam")==null)
srk.CreateSubKey("Sunsoft/SunWebExam");
RegistryKey crk=srk.OpenSubKey("Sunsoft/SunWebExam",true);
crk.SetValue(name,connstr);
rk.Close();
srk.Close();
crk.Close();
}
{
RegistryKey rk=Registry.LocalMachine;
RegistryKey srk=rk.OpenSubKey("software",true);
if(srk.OpenSubKey("Sunsoft/SunWebExam")==null)
srk.CreateSubKey("Sunsoft/SunWebExam");
RegistryKey crk=srk.OpenSubKey("Sunsoft/SunWebExam",true);
crk.SetValue(name,connstr);
rk.Close();
srk.Close();
crk.Close();
}
private void btnSave_Click(object sender, System.EventArgs e)
{
string connString="packet size=4096;data source=";
//string connString="provider=SQLOLEDB;packet size=4096;data source=";
connString+=txtServer.Text.Trim()+";user id=";
connString+=txtUser.Text.Trim()+";pwd=";
connString+=txtPwd.Text.Trim()+";persist security info=False;initial catalog=SunWebExam";
//
//todo:寫入註冊表
//
SetRegistryKey("Server",connString);
this.DialogResult=DialogResult.OK;
this.Close();
}
{
string connString="packet size=4096;data source=";
//string connString="provider=SQLOLEDB;packet size=4096;data source=";
connString+=txtServer.Text.Trim()+";user id=";
connString+=txtUser.Text.Trim()+";pwd=";
connString+=txtPwd.Text.Trim()+";persist security info=False;initial catalog=SunWebExam";
//
//todo:寫入註冊表
//
SetRegistryKey("Server",connString);
this.DialogResult=DialogResult.OK;
this.Close();
}
/// <summary>
/// 打開數據庫連接.
/// </summary>
private void Open()
{
// 打開數據庫連接
if (con == null)
{
RegistryKey rk=Registry.LocalMachine;
RegistryKey subrk=rk.OpenSubKey("software/Sunsoft/SunWebExam");
string connString=(string)subrk.GetValue("server");
con = new SqlConnection(connString);
con.Open();
}
if(con.State ==System.Data.ConnectionState.Closed)
con.Open();
}
/// 打開數據庫連接.
/// </summary>
private void Open()
{
// 打開數據庫連接
if (con == null)
{
RegistryKey rk=Registry.LocalMachine;
RegistryKey subrk=rk.OpenSubKey("software/Sunsoft/SunWebExam");
string connString=(string)subrk.GetValue("server");
con = new SqlConnection(connString);
con.Open();
}
if(con.State ==System.Data.ConnectionState.Closed)
con.Open();
}