47 lines
1.6 KiB
MySQL
47 lines
1.6 KiB
MySQL
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-- 修改外键约束为级联删除
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-- 删除量表时，自动删除关联的测评记录和预警记录
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-- 1. 先删除现有的外键约束
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ALTER TABLE psy_warning DROP FOREIGN KEY fk_warning_assessment;
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-- 2. 重新添加外键约束，设置为级联删除
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ALTER TABLE psy_warning
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ADD CONSTRAINT fk_warning_assessment
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FOREIGN KEY (assessment_id) REFERENCES psy_assessment(assessment_id)
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ON DELETE CASCADE;
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-- 3. 检查 psy_assessment 表是否有关联 psy_scale 的外键，如果有也改为级联删除
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-- 先查看现有外键
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SELECT
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CONSTRAINT_NAME,
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TABLE_NAME,
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COLUMN_NAME,
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REFERENCED_TABLE_NAME,
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REFERENCED_COLUMN_NAME
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FROM information_schema.KEY_COLUMN_USAGE
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WHERE TABLE_SCHEMA = 'ry_xinli'
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AND REFERENCED_TABLE_NAME IS NOT NULL
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AND TABLE_NAME IN ('psy_assessment', 'psy_warning', 'psy_assessment_answer', 'psy_assessment_report');
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-- 4. 如果 psy_assessment_answer 有外键约束，也改为级联删除
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-- ALTER TABLE psy_assessment_answer DROP FOREIGN KEY 外键名;
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-- ALTER TABLE psy_assessment_answer
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-- ADD CONSTRAINT fk_answer_assessment
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-- FOREIGN KEY (assessment_id) REFERENCES psy_assessment(assessment_id)
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-- ON DELETE CASCADE;
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-- 5. 如果 psy_assessment_report 有外键约束，也改为级联删除
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-- ALTER TABLE psy_assessment_report DROP FOREIGN KEY 外键名;
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-- ALTER TABLE psy_assessment_report
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-- ADD CONSTRAINT fk_report_assessment
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-- FOREIGN KEY (assessment_id) REFERENCES psy_assessment(assessment_id)
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-- ON DELETE CASCADE;
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-- 验证修改结果
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SELECT
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CONSTRAINT_NAME,
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TABLE_NAME,
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DELETE_RULE
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FROM information_schema.REFERENTIAL_CONSTRAINTS
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WHERE CONSTRAINT_SCHEMA = 'ry_xinli';
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