Add support for transaction multiplexing

Also delay getting a connection until after we do all the sanity
checks (e.g., that there is no active transaction). Otherwise we
are running risk of getting blocked rather than throwing an
exception.

1 files changed, 6 insertions, 4 deletions

diff --git a/odb/sqlite/transaction-impl.hxx b/odb/sqlite/transaction-impl.hxx
index 8b5687b..f0df824 100644
--- a/odb/sqlite/transaction-impl.hxx
+++ b/odb/sqlite/transaction-impl.hxx
@@ -21,10 +21,7 @@ namespace odb
   {
     class LIBODB_SQLITE_EXPORT transaction_impl: public odb::transaction_impl
     {
-    protected:
-      friend class connection;
-      friend class transaction;
-
+    public:
       typedef sqlite::database database_type;
       typedef sqlite::connection connection_type;
 
@@ -35,12 +32,16 @@ namespace odb
         exclusive
       };
 
+      transaction_impl (database_type&, lock);
       transaction_impl (connection_ptr, lock);
 
       virtual
       ~transaction_impl ();
 
       virtual void
+      start ();
+
+      virtual void
       commit ();
 
       virtual void
@@ -51,6 +52,7 @@ namespace odb
 
     private:
       connection_ptr connection_;
+      lock lock_;
     };
   }
 }