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-rw-r--r--odb/pgsql/statements-base.hxx24
1 files changed, 19 insertions, 5 deletions
diff --git a/odb/pgsql/statements-base.hxx b/odb/pgsql/statements-base.hxx
index 9647984..efb5753 100644
--- a/odb/pgsql/statements-base.hxx
+++ b/odb/pgsql/statements-base.hxx
@@ -7,10 +7,12 @@
#include <odb/pre.hxx>
+#include <odb/schema-version.hxx>
#include <odb/details/shared-ptr.hxx>
#include <odb/pgsql/version.hxx>
-#include <odb/pgsql/forward.hxx> // connection
+#include <odb/pgsql/connection.hxx>
+#include <odb/pgsql/database.hxx>
#include <odb/pgsql/details/export.hxx>
@@ -29,18 +31,30 @@ namespace odb
return conn_;
}
+ // Schema version. database::schema_version_migration() is thread-
+ // safe which means it is also slow. Cache the result in statements
+ // so we can avoid the mutex lock. This is thread-safe since if the
+ // version is updated, then the statements cache will be expired.
+ //
+ const schema_version_migration&
+ version_migration (const char* name = "") const
+ {
+ if (svm_ == 0)
+ svm_ = &conn_.database ().schema_version_migration (name);
+
+ return *svm_;
+ }
+
public:
virtual
~statements_base ();
protected:
- statements_base (connection_type& conn)
- : conn_ (conn)
- {
- }
+ statements_base (connection_type& conn): conn_ (conn), svm_ (0) {}
protected:
connection_type& conn_;
+ mutable const schema_version_migration* svm_;
};
}
}