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Diffstat (limited to 'libodb-pgsql/odb/pgsql/statements-base.hxx')
-rw-r--r-- | libodb-pgsql/odb/pgsql/statements-base.hxx | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libodb-pgsql/odb/pgsql/statements-base.hxx b/libodb-pgsql/odb/pgsql/statements-base.hxx new file mode 100644 index 0000000..8b45bdc --- /dev/null +++ b/libodb-pgsql/odb/pgsql/statements-base.hxx @@ -0,0 +1,63 @@ +// file : odb/pgsql/statements-base.hxx +// license : GNU GPL v2; see accompanying LICENSE file + +#ifndef ODB_PGSQL_STATEMENTS_BASE_HXX +#define ODB_PGSQL_STATEMENTS_BASE_HXX + +#include <odb/pre.hxx> + +#include <odb/schema-version.hxx> +#include <odb/details/shared-ptr.hxx> + +#include <odb/pgsql/version.hxx> +#include <odb/pgsql/connection.hxx> +#include <odb/pgsql/database.hxx> + +#include <odb/pgsql/details/export.hxx> + +namespace odb +{ + namespace pgsql + { + class LIBODB_PGSQL_EXPORT statements_base: public details::shared_base + { + public: + typedef pgsql::connection connection_type; + + connection_type& + connection () + { + 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), svm_ (0) {} + + protected: + connection_type& conn_; + mutable const schema_version_migration* svm_; + }; + } +} + +#include <odb/post.hxx> + +#endif // ODB_PGSQL_STATEMENTS_BASE_HXX |