question: open the database connection . for most databases , it is not required to load the driver before calling this method . concode_field_sep Connection conn concode_elem_sep Statement stat concode_elem_sep HashMap<String,PreparedStatement> prepared concode_elem_sep PreparedStatement prep concode_elem_sep int index concode_field_sep Prepared prepare concode_elem_sep Prepared set concode_elem_sep Prepared set concode_elem_sep Prepared set concode_elem_sep Prepared set concode_elem_sep List<Map<String,Object>> query concode_elem_sep List<Map<String,Object>> query concode_elem_sep List<Map<String,Object>> query concode_elem_sep void setAutoCommit concode_elem_sep void commit concode_elem_sep RuntimeException convert concode_elem_sep void execute concode_elem_sep void execute concode_elem_sep void close
target: Db function ( String arg0 , String arg1 , String arg2 ) { try { JdbcDriverUtils . load ( arg0 ) ; return new Db ( DriverManager . getConnection ( arg0 , arg1 , arg2 ) ) ; } catch ( SQLException loc0 ) { throw convert ( loc0 ) ; } }