Java Netbeans DB表关系

Question

I am trying to create a Java project using a database.

I have created a database with 3 tables and created a relationship connecting 2 of the tables to other. So Members , Donation and Expenses . Donations and Expenses are connected to Members . I used the following SQL to create the relationship:

ALTER TABLE <TABLE>
    ADD CONSTRAINT TABLE_FK
    FOREIGN KEY (MEMBER_ID)
    REFERENCES MEMBERS (ID); 

When I try and add data to either the Donations or Expenses table I can't because of the connection with Members table: it has a variable <MEMBERS member> instead of <String Member_ID> . How do I add data to the tables or should I just recreate my database?

Answer 1

因此，根据注释中发布的摘录片段，您需要创建一个新的Member对象，或者使用您用来通过POJO与数据库进行接口的任何框架检索现有的Member对象，并假设Member在Donations中不可为空，并使用Donations（假定的）setMember方法填充Member。