JAVA实体类怎么设计，不用框架

Question

现有三个表：
A表：字段有user_id(主键), userName;
B表：字段有commodity_id(主键), user_id(外键：A.user_id), commodity_name;
C表：字段有sku_id(主键), commodity_id(外键：B.commodity_id), sku_code;
关系：A,B:一对多，B,C:一对多

现在我要查询数据，查询语句是:
select A.*, B.*, C.*
from A A
left out join B B on A.user_id = B.user_id
left out join C C on B.commodity_id = C.commodity_id;
然后通过下面的方法取值，请问我改如何设计实体类，不用框架的那种

public List executeQuery(String preparedSql, String[] params ){
List results = null;
pstmt = null;
try{
conn = this.getConn();
pstmt = conn.prepareStatement(preparedSql);
int i = 1;//计数器
if (params != null) {//判断参数集是否为空
for (String param : params) {//添加SQL语句参数
pstmt.setString(i, param);
i++;
}
}
rs = pstmt.executeQuery();
results = createObject(rs);//提取查询结果集
}catch(Exception er){
er.printStackTrace();
}finally{
this.closeAll();
}
return results;
}

@Override
public List createObject(ResultSet rs) throws SQLException {
List listA=new ArrayList();
while(rs.next()){
A a=new A();

        ...............

        listClient.add(a);
    }
    return listA;
}

Answer 1

你使用power designer画一下这三个表，然后生成java实体类，就知道实体类对应关系为何了。