登錄失敗數據庫

Question

我使用下面的代碼來備份我的數據庫......

Dim con As SqlConnection 
Dim cmd As SqlCommand 
con = New SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=LIC;Trusted_Connection = yes") 
cmd = New SqlCommand("BACKUP DATABASE LIC to disk='C:\Backup\ICLS.bak'", con) 
con.Open() 
cmd.ExecuteNonQuery() 
con.Close() 

但我得到這個錯誤

Cannot open database "LIC" requested by the login. The login failed. Login failed for user 'mono-PC\mono'.

任何幫助表示讚賞。

Answer 1

試試這個。它仍然會失敗，但它會打印一個數字（例外狀態）。下面的表格列出了可能的狀態以及它們可能發生的原因（從http://blogs.msdn.com/b/sql_protocols/archive/2006/02/21/536201.aspx和http://msdn.microsoft.com/en-us/library/ms366351.aspx）。查看這些鏈接以解決問題。

try 
    Dim con As SqlConnection 
    Dim cmd As SqlCommand 
    con = New SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=LIC;Trusted_Connection = yes") 
    cmd = New SqlCommand("BACKUP DATABASE LIC to disk='C:\Backup\ICLS.bak'", con) 
    con.Open() 
    cmd.ExecuteNonQuery() 
    con.Close() 
catch e as SqlException 
    Console.WriteLine("State: " & e.State) 
end try 

可能的狀態：

ERROR STATE ERROR DESCRIPTION 
2 and 5  Invalid userid 
6   Attempt to use a Windows login name with SQL Authentication 
7   Login is disabled, and the password is incorrect 
8   Password mismatch 
9   Invalid password 
11 and 12 Valid login but server access failure 
13   SQL Server service paused 
18   Change password required