Thanks for very much for help. It seems that I can do the test project for new job. In future I use help of chat.gpt
Regards Raivo On Sat, Sep 30, 2023 at 11:15 AM <postgresql439...@heinz-it.de> wrote: > Am 30.09.23 um 08:33 schrieb Raivo Rebane: > > Hi, > > sometimes I am lucky and don't get the old error, but sometime not. > > > > I tried to use PreparedStatement, but I got error - > > org.postgresql.util.PSQLException: Can't use query methods that take a > > query string on a PreparedStatement. > > at > > > org.postgresql.jdbc.PgPreparedStatement.executeUpdate(PgPreparedStatement.java:145) > > at MushroomAPIs.Clean.deleteAllRecordsFromTable(Clean.java:34) > > and java code is - > > > > String deleteQuery = "DELETE FROM " + tableNam > > > > System.out.println(deleteQuery); > > > > PreparedStatement statement = connection.prepareStatement(deleteQuery); > if your statement is already prepared with query, use > statement.exequte(); or statement.executeQuery() without querystring; > if you have a new statement without query, use execute and such with > query string. > > > > May be it's easy for me to use normal statement ? > > > > > > Raivo > > > > > > On Sat, Sep 30, 2023 at 8:27 AM Raivo Rebane <raivor...@gmail.com> > wrote: > [snip] > > > Am 30.09.23 um 09:18 schrieb Raivo Rebane: > > I fix previous error what was my bad knowledge, > > But new error occur which is related to postgres postgis jars. > > If You are kind to answer me more; > > > > Java code is : > > > > public static boolean CheckIsNewInMushrooms(Connection connection, Point > > AddLocation, String AddDescription) { > > > > boolean IsNew = true; > > > > > > try { > > > > String sqlQuery = "SELECT location, description FROM mushrooms"; > > > > try (PreparedStatement preparedStatement = connection.prepareStatement( > > sqlQuery)) { > > > > ResultSet resultSet = preparedStatement.executeQuery(); > > > > > > while (resultSet.next()) { > > > > Point point = (Point) resultSet.getObject("location"); > > > > String description = resultSet.getString("description"); > > > > > > if (AddLocation.x == point.x && AddLocation.y == point.y && > AddDescription > > .equals(description)) > > > > IsNew = false; > > > > } > > > > } > > > > } catch (SQLException e) { > > > > e.printStackTrace(); > > > > } > > > > > > return IsNew; > > > > } > > > > and at line > > > > Point point = (Point) resultSet.getObject("location"); > > > > > > java.lang.ClassCastException: org.postgresql.util.PGobject cannot be cast > > to org.postgis.Point > > at > > > MushroomAPIs.ProcAddMushrooms.CheckIsNewInMushrooms(ProcAddMushrooms.java:45) > > How to get Point from resultset ? > > Is it related to postgis driver ? > try another way to cast to Point. > look for the way over PGgeometry like here > https://postgis.net/docs/manual-3.3/ch07.html#idm3092 > > > > Regards > > Raivo > > >