小编Jay*_*Jay的帖子

我怎样才能准备好这个呢？

    Statement stmt = con.createStatement();

    long lastid = getLastId(stmt);

    // create a SQL query
    String strQuery = "INSERT INTO studenten " +
    " (id, naam, adres, postcode, plaats, geboren) " +
    " VALUES (" + (lastid+1) + "," +
        "'" + contact.getNaam() + "'," +
        "'" + contact.getAdres() + "'," +
        "'" + contact.getPostcode() + "'," +
        "'" + contact.getPlaats() + "'," +
      "{d '" + contact.getGeboren() + "'}" +
    ") ";

    stmt.executeUpdate(strQuery);      
    stmt.close();
    con.close();

是否可以创建一个包含两列值的列的表？这样的事情:

create table test1(number1 decimal(6,2),number2 decimal(6,2),total decimal(6,2)DEFAULT(number1 + number2));