在Entity Framework Code First中删除localdb

Question

我正在用NUnit和Entity Framework编写一些UnitTests.如何从Entity Framework级别删除整个localdb数据库？

注意:我不想清除表的数据.我想删除整个数据库.

此外,我可以在我的应用程序工作目录中创建一个localdb文件,前提是尚未创建数据库:

string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "");
var testDbFileName = String.Format(@"UnitTestDB.mdf");
var testDbFileNameWithPath = path + @"\" + testDbFileName;

var connectionString =
String.Format(
    @"Data Source=(localdb)\V11.0;Initial Catalog={0};Integrated Security=True;AttachDBFilename={1};MultipleActiveResultSets=True",
    "UnitTestDB", testDbFileNameWithPath);

//Here would be the code passing connection string to DbContext and so on..

仅删除文件"UnitTestDB.mdf"是不够的.在SQL Management Studio中仍然有对db的引用

Answer 1

在代码中有两种方法可以做到这一点.如果可以,请先坚持使用EF代码:-)

1)EF在上下文中有一个很好的选择.

 Context.Database.Delete()

2)如果你想要旧学校的SQLCommand/SqlConnection方法就像这样的黑客例程...

 public  bool DropDB(string DBName, string ConnectionString)
    {

        SqlConnection conn = null;
        SqlCommand cmd = null;
        string stmt = null;

        int rowCount = 0;

        if (string.IsNullOrEmpty(DBName))
            throw new ArgumentNullException(DBName, "DBName required");

        try
        {
            conn = new SqlConnection(ConnectionString);

           stmt = "DROP DATABASE " + DBName ;

            cmd = new SqlCommand(stmt, conn);
            conn.Open();
            rowCount = cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch (Exception)
        {
            //todo  whatever
            throw;
        }
        finally
        {
            if (conn != null) conn.Dispose();
            if (cmd != null) conn.Dispose();
        }
        if (rowCount == -1) return true;
        return false;
    }