java - 在java中显示两个表中的值

Question

我使用 Java 创建了与数据库的连接，我想显示两个表中的数据。

在查询语句中，我使用了 JOIN 命令，但我正在努力解决语法错误。希望得到这方面的一些建议。

try
    {
        Class.forName(driverName);
        connection = DriverManager.getConnection(SourceURL, user, password);


        Statement listDisplay = connection.createStatement();
        ResultSet displayAll = listDisplay.executeQuery("SELECT AnimalType.typeID, AnimalType.description, Animal.name "
                                                     +"FROM Animal "
                                                     +"JOIN AnimalType "       
                                                     +"ON AnimalType.typeID = Animal.typeIDForeign");  
        while(displayAll.next())
        {
            int typeId = displayAll.getInt(1);
            String description = displayAll.getString(2);
            String name = displayAll.getString(3);

            System.out.println(typeId + " " + description + " " + name);
        }

        connection.close();

        }
        catch(SQLException sql)
        {
            JOptionPane.showMessageDialog(null, sql.toString());
        }
        catch(ClassNotFoundException exe)
        {
            JOptionPane.showMessageDialog(null, exe.toString());
        }

它能实现我在这里尝试做的事情吗？

问候阿里安

Answer 1

我通常这样做:

if (displayAll.first())
{
    do
    {
        int typeId = displayAll.getInt(1);
        String description = displayAll.getString(2);
        String name = displayAll.getString(3);

        System.out.println(typeId + " " + description + " " + name);
    } while(displayAll.next());
}
displayAll.close();
listDisplay.close();