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