Add odb::connection class

This abstract class represents a connection to the database. One can
use it to start a transaction or to execute a native statement out
of a transaction.

Before we had concrete connection classes in the database runtime
libraries (e.g., odb::mysql::connection). Now these classes derive
from odb::connection.

1 files changed, 6 insertions, 6 deletions

diff --git a/odb/sqlite/transaction-impl.cxx b/odb/sqlite/transaction-impl.cxx
index 609a9c5..772b274 100644
--- a/odb/sqlite/transaction-impl.cxx
+++ b/odb/sqlite/transaction-impl.cxx
@@ -14,26 +14,26 @@ namespace odb
   namespace sqlite
   {
     transaction_impl::
-    transaction_impl (database_type& db, lock l)
-        : odb::transaction_impl (db), connection_ (db.connection ())
+    transaction_impl (connection_ptr c, lock l)
+        : odb::transaction_impl (c->database (), *c), connection_ (c)
     {
-      statement_cache& c (connection_->statement_cache ());
+      statement_cache& sc (connection_->statement_cache ());
 
       switch (l)
       {
       case deferred:
         {
-          c.begin_statement ().execute ();
+          sc.begin_statement ().execute ();
           break;
         }
       case immediate:
         {
-          c.begin_immediate_statement ().execute ();
+          sc.begin_immediate_statement ().execute ();
           break;
         }
       case exclusive:
         {
-          c.begin_exclusive_statement ().execute ();
+          sc.begin_exclusive_statement ().execute ();
           break;
         }
       }