外來鍵新增失敗：java.sql.SQLException: Cannot add or update a child row: a foreign key constraint fails
錯誤程式碼
java.sql.SQLException: Cannot add or update a child row: a foreign key constraint fails (book.t_order_item, CONSTRAINT t_order_item_ibfk_1 FOREIGN KEY (order_id) REFERENCES t_order (order_id)) Query: insert into t_order_item(name,count,price,total_price,order_id)values(?,?,?,?,?) Parameters: [Java程式設計思想, 1, 100, 100, 1234511]
嘗試根據錯誤資訊排錯
a foreign key constraint fails：外來鍵約束異常- 意思就是，設定的外來鍵和對應表的主鍵的值不匹配，即order_id的值在表t_order中沒有匹配上。
解決辦法
- 找出不匹配的值，修改成匹配的
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