在 C# 中分离 SQL Server 数据库

Question

SqlConnection con = new SqlConnection();
con.ConnectionString = @"Data Source =.; Initial Catalog = master; Integrated Security = True;";
con.Open();
string str = "USE master;" +
"EXEC sp_detach_db @dbname = N'PhoneBookDB'";
SqlCommand cmd = new SqlCommand(str, con);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Detached", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
Application.Exit();

我收到此错误：

无法分离数据库"PhoneBookDB"，因为它当前正在使用中。 将数据库上下文更改为"master"。

我该怎么办？

Answer 1

你能试试这个吗：

SqlConnection con = new SqlConnection();
con.ConnectionString = @"Data Source =.; Initial Catalog = master; Integrated Security = True;";
con.Open();
string str = "USE master;" +
"ALTER DATABASE PhoneBookDB SET SINGLE_USER WITH ROLLBACK IMMEDIATE; EXEC sp_detach_db @dbname = N'PhoneBookDB'";
SqlCommand cmd = new SqlCommand(str, con);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Detached", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information);
    Application.Exit();

您也可以尝试使用sp_who或sp_whoisactive来查找当前连接并杀死它们。