getting a boolean value from postgresql in java

Question

I am having troubles to print a boolean value from a postgresql table in java.

the table:

java=# select * from Materias;
 codigo | nombre | contenido | troncal 
--------+--------+-----------+---------
      1 |        |           | f
      2 |        |           | f
      3 |        |           | f
      4 |        |           | t
      5 |        |           | t
      6 |        |           | t

now the output using getString

   linea = String.format("%-15d %-20s %-10s", resultado.getInt(1), resultado.getString(2), resultado.getString(3));
    Codigo          Nombre               Troncal   
    1                                    null      
    2                                    null      
    3                                    null      
    4                                    null      
    5                                    null      
    6                                    null 

the output using getBoolean

linea = String.format("%-15d %-20s %-10s", resultado.getInt(1), resultado.getString(2), resultado.getBoolean(3));

    Codigo          Nombre               Troncal   
    1                                    false     
    2                                    false     
    3                                    false     
    4                                    false     
    5                                    false     
    6                                    false     

Answer 1

You've got 4 columns but you're only looking at the first 3! The rs.getX(int) methods index from 1 (confusingly)

I would rewrite your select, btw, to explicitly state the columns and the order that you require them to be returned in.