SET extra_float_digits = 3 in postgresql

Question

Whenever I start Postgresql DB engine, I have almost 7-8 queries running in the background SET extra_float_digits = 3

I am not sure why these are running al

Answer 1

I've had this problem with Java and Postgresql. I've resolved this issue by using PGPoolingDataSource and Close connection.

Here how I've built my classes:

//Class Factory Connection:

public class FacConn {

    public static PGPoolingDataSource getConnection2() {
    PGPoolingDataSource source = new PGPoolingDataSource();
    source.setServerName("local");
    source.setPortNumber(5432);
    source.setDatabaseName("mydbname");
    source.setUser("LoginUser");
    source.setPassword("password");
    source.setAssumeMinServerVersion("9.0");
    source.setConnectTimeout(50000);        

    return source;      
    }
}

//Class userDAO - class to interact with database

public class UsuarioDAO {

    private PGPoolingDataSource poolDS = FabConexao.getConnection2();
    private Connection con = null;

    public User searchById(Integer id){
        try{con = poolDS.getConnection();}
        catch (SQLException e){throw new RuntimeException(e);}

        String sql = "Select * from people where id_people=?";
        ResultSet rs = null;

        try (PreparedStatement smtm = con.prepareStatement(sql)){
            smtm.setInt(1, id);
            rs = smtm.executeQuery();
            People people = new People();
            if(rs.next()){
                people.setId_People(rs.getInt("id_people"));
                people.setFirtname(rs.getString("firstname"));
                people.setLastname(rs.getString("lastname"));
                people.setAge(rs.getInt("age"));
                people.setActiv(rs.getBoolean("activ"));
            } 
            smtm.close();   
            return people;
        } catch (SQLException e){
            e.printStackTrace();
            System.err.println( e.getClass().getName()+": "+ e.getMessage() );          
        }  finally {
            if (rs != null) {
                try {rs.close();} catch (SQLException e) { /* ignored */}
            }
            poolDS.close();
        }
        return null;
}