all in

database/add_foreign_keys.sql

@@ -0,0 +1,43 @@
+-- ========================================
+-- 为评查点系统添加外键约束
+-- ========================================
+
+-- 1️⃣ 为 evaluation_points 表添加外键约束
+-- evaluation_point_groups_id 引用 evaluation_point_groups.id
+ALTER TABLE evaluation_points
+ADD CONSTRAINT fk_evaluation_points_group
+FOREIGN KEY (evaluation_point_groups_id)
+REFERENCES evaluation_point_groups(id)
+ON DELETE SET NULL  -- 删除分组时，将评查点的分组ID设为NULL
+ON UPDATE CASCADE;  -- 更新分组ID时，级联更新
+
+-- 2️⃣ 为 evaluation_point_groups 表添加自引用外键约束
+-- pid 引用同一个表的 id（父子关系）
+ALTER TABLE evaluation_point_groups
+ADD CONSTRAINT fk_evaluation_point_groups_parent
+FOREIGN KEY (pid)
+REFERENCES evaluation_point_groups(id)
+ON DELETE CASCADE   -- 删除父分组时，级联删除子分组
+ON UPDATE CASCADE;  -- 更新父分组ID时，级联更新
+
+-- 添加注释
+COMMENT ON CONSTRAINT fk_evaluation_points_group ON evaluation_points IS '评查点所属分组外键约束';
+COMMENT ON CONSTRAINT fk_evaluation_point_groups_parent ON evaluation_point_groups IS '评查点分组父子关系自引用外键约束';
+
+-- 验证外键约束是否创建成功
+SELECT
+    tc.table_name,
+    tc.constraint_name,
+    kcu.column_name,
+    ccu.table_name AS foreign_table_name,
+    ccu.column_name AS foreign_column_name
+FROM information_schema.table_constraints AS tc
+JOIN information_schema.key_column_usage AS kcu
+    ON tc.constraint_name = kcu.constraint_name
+    AND tc.table_schema = kcu.table_schema
+JOIN information_schema.constraint_column_usage AS ccu
+    ON ccu.constraint_name = tc.constraint_name
+    AND ccu.table_schema = tc.table_schema
+WHERE tc.constraint_type = 'FOREIGN KEY'
+    AND tc.table_name IN ('evaluation_points', 'evaluation_point_groups')
+ORDER BY tc.table_name, tc.constraint_name;