Avoid recreating the LocalDB instance by detaching orphaned databases

Author: AndriySvyryd

tools/CleanMSSQLLocalDB.cmd

@@ -1,8 +1,6 @@
 @echo off
-sqlcmd -S "(localdb)\mssqllocaldb" -i "DropAllDatabases.sql" -o "DropAll.sql"
+sqlcmd -S "(localdb)\mssqllocaldb" -i "%~dp0DropAllDatabases.sql" -o "DropAll.sql"
 sqlcmd -S "(localdb)\mssqllocaldb" -i "DropAll.sql"
 del "DropAll.sql"
-sqllocaldb stop mssqllocaldb
-sqllocaldb delete mssqllocaldb
 
 %~dp0ShrinkLocalDBModel.cmd

tools/DropAllDatabases.sql

@@ -15,6 +15,10 @@ WHILE @@FETCH_STATUS = 0
 BEGIN
     PRINT 'DROP DATABASE [' + REPLACE( @name, ']', ']]' ) + ']'
     PRINT 'GO'
+
+    PRINT 'IF(db_id(''' + REPLACE( @name, '''', '''''') + ''') IS NOT NULL)'
+    PRINT 'EXEC sp_detach_db ''' + REPLACE( @name, '''', '''''') + ''''
+    PRINT 'GO'
 
     FETCH NEXT FROM db 
     INTO @name