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?
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。
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