add JdbcTemplate

like Spring Data

src/main/java/ghast/database/ResultSetExtractor.java

@@ -0,0 +1,9 @@
+package ghast.database;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public interface ResultSetExtractor<T> {
+
+	T extractData(ResultSet rs) throws SQLException, DataAccessException;
+}