Question

How to insert java Date object into Postgresql DATE cell?

When I do it my way, it’s wrong:

Calendar date = Calendar.getInstance(); // wrong
Date date = new Date(); // wrong         

String addRecord = "INSERT INTO " + GlobalFields.PACJENCI_TABLE +
                                "VALUES (" + date + ");";
stat.executeUpdate(addRecord)

I have no more ideas…

PS:

public static void CreatePacjenciTable()
{
    try
    {
        Connection conn = DataBase.Connect();

        try
        {
            Statement stat = conn.createStatement();

            String createTable = "CREATE TABLE " + GlobalFields.PACJENCI_TABLE 
                + "(dataUrodzenia DATE);";

            stat.executeUpdate(createTable);
        }
        finally
        {
            conn.close();
        }
    }
    catch(SQLException e)
    {
        e.printStackTrace();
    } 
}

Answer 1

You shouldn’t do it like that at all!

Never, ever, construct SQL strings with their parameters in them. Instead, create a PreparedStatement and set the parameters on it. Like this:

    String addRecord = "INSERT INTO " + GlobalFields.PACJENCI_TABLE + "VALUES (?);";
    PreparedStatement stmt = conn.prepareStatement(addRecord);
    stmt.setDate(1, new Date(System.currentTimeMillis()));
    stmt.executeUpdate();

Note that the Date there is a java.sql.Date, which is a subclass of the normal java.util.Date in which the time of day is always midnight UTC; it is used to represent an actual date, not a moment in time. You can alternatively use a java.sql.Timestamp, which represents a moment in time.