Question

这是我备份数据库的代码这些是我的数据库：
enter image description here

我得到了这个错误：

数据库'BakupDB'不存在。确保输入名称正确。 BACKUP DATABASE异常终止。

我的网页代码：

public partial class Default2 : System.Web.UI.Page
{
    string dbname = "BakupDB";
    SqlConnection sqlcon = new SqlConnection();
    SqlCommand sqlcmd = new SqlCommand();
    SqlDataAdapter da = new SqlDataAdapter();
    DataTable dt = new DataTable();

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click1(object sender, EventArgs e)
    {
        //Mentioned Connection string make sure that user id and password sufficient previlages
        sqlcon.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\BakupDB.mdf;Integrated Security=True;User Instance=True";

        //Enter destination directory where backup file stored
        string destdir = "D:\\backupdb";

        try
        {
            sqlcon.Open();
            sqlcmd = new SqlCommand("backup database "+dbname+" to disk='" + destdir + "\\" + DateTime.Now.ToString("ddMMyyyy_HHmmss") + ".Bak'", sqlcon);
            sqlcmd.ExecuteNonQuery();

            sqlcon.Close();
            Response.Write("Backup database successfully");
        }
        catch (Exception ex)
        {
            Response.Write("Error During backup database!");
        }
    }
}

我错了什么？

Answer 1

看起来您正在尝试使用User Instance。另外（与您的问题没有100％相关）我认为SQL Server Express 2012中不推荐使用此功能（自SQL Server 2008以来一直处于弃用状态）。

对不起。关于您的问题，以下内容可能对您有所帮助：

Stack Overflow question
使用SMO

我想说Stack Overflow问题更接近于您尝试通过执行SQL命令实现的用例，但是如果您感兴趣或想要尝试不同的方法，则引用了SMO方式。根据SO问题，您的连接字符串显示为：

sqlcon.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\BakupDB.mdf;Integrated Security=True;User Instance=True";

缺少Database=部分，所以它可能应该是：

sqlcon.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\BakupDB.mdf;Integrated Security=True;User Instance=True;Database=BakupDB";

Answer 2

此代码对我有用：

private void button5_Click(object sender, EventArgs e)
{
    try
    {
        string dlink= @"DataSource=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\jsdb.mdf; Database=jsdb; User Instance=True; Integrated Security=True;Asynchronous Processing= True";
        SqlConnection dcc = new SqlConnection(dlink);
        dcc.Open();
            string database = "jsdb"; 
            string blc = textBox1.Text;  //(Its the location to save the file)
            string nm = "dbBackup";
            string dt =DateTime.Today.ToShortDateString();
            string sl = "BACKUP DATABASE "+database+" TO DISK = '"+blc+"\\"+nm+"-"+dt+".bak'" ;
            SqlCommand cql = new SqlCommand(sl,dcc);
            cql.ExecuteNonQuery();
            MessageBox.Show("Database backup completed successfully..");
            dcc.Close();
    } 
   catch (Exception ex)
    { MessageBox.Show(ex.Message); }
}

数据库不存在

2 个答案: