166 lines
4.8 KiB
SQL
166 lines
4.8 KiB
SQL
-- ========================================
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-- 数据库维护脚本
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-- ========================================
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-- 用途：定期清理和优化数据
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-- 使用方法：mysql -u root -proot study < 数据库维护.sql
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USE study;
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-- ========================================
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-- 1. 数据清理
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-- ========================================
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-- 1.1 清理孤儿记录（学生已删除但分配记录仍存在）
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SELECT '开始清理孤儿记录...' AS step;
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SELECT COUNT(*) AS 清理前孤儿记录数
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FROM student_class sc
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LEFT JOIN sys_user u ON sc.student_id = u.user_id
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WHERE u.user_id IS NULL OR u.del_flag = '2';
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-- 执行清理（可选，默认注释掉，需要时取消注释）
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-- DELETE sc FROM student_class sc
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-- LEFT JOIN sys_user u ON sc.student_id = u.user_id
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-- WHERE u.user_id IS NULL OR u.del_flag = '2';
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-- SELECT '✓ 孤儿记录已清理' AS result;
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-- ========================================
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-- 2. 数据一致性修复
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-- ========================================
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SELECT '开始修复数据一致性...' AS step;
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-- 2.1 修复所有正常学员的status为1
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UPDATE student_class sc
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INNER JOIN sys_user u ON sc.student_id = u.user_id
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SET sc.status = 1
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WHERE u.del_flag = '0'
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AND u.register_type = 'student'
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AND sc.status = 0;
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SELECT ROW_COUNT() AS 已修复记录数;
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SELECT '✓ status修复完成' AS result;
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-- ========================================
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-- 3. 数据统计
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-- ========================================
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SELECT '生成统计报告...' AS step;
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-- 3.1 总体统计
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SELECT
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'总体统计' AS 类别,
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COUNT(DISTINCT u.user_id) AS 学生总数,
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COUNT(DISTINCT sc.class_id) AS 班级总数,
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COUNT(DISTINCT CASE WHEN sc.status = 1 THEN u.user_id END) AS 已分配学生数,
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COUNT(DISTINCT CASE WHEN sc.status = 0 THEN u.user_id END) AS 未分配学生数
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FROM sys_user u
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LEFT JOIN student_class sc ON u.user_id = sc.student_id
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WHERE u.del_flag = '0'
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AND u.register_type = 'student';
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-- 3.2 各监区统计
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SELECT
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u.prison_area AS 监区,
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COUNT(DISTINCT u.user_id) AS 学生数,
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COUNT(DISTINCT sc.class_id) AS 班级数,
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COUNT(DISTINCT CASE WHEN sc.status = 1 THEN u.user_id END) AS 已分配学生
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FROM sys_user u
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LEFT JOIN student_class sc ON u.user_id = sc.student_id AND sc.status = 1
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WHERE u.del_flag = '0'
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AND u.register_type = 'student'
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GROUP BY u.prison_area
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ORDER BY u.prison_area;
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-- 3.3 班级学生数Top10
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SELECT
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c.class_name AS 班级,
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COUNT(*) AS 学生数,
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GROUP_CONCAT(DISTINCT u.prison_area) AS 监区
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FROM class c
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INNER JOIN student_class sc ON c.id = sc.class_id
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INNER JOIN sys_user u ON sc.student_id = u.user_id
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WHERE sc.status = 1
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AND u.del_flag = '0'
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GROUP BY c.class_name
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ORDER BY 学生数 DESC
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LIMIT 10;
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-- ========================================
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-- 4. 异常数据检测
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-- ========================================
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SELECT '检测异常数据...' AS step;
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-- 4.1 一个学生在多个有效班级
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SELECT
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u.user_id AS 学生ID,
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u.nick_name AS 姓名,
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COUNT(*) AS 班级数,
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GROUP_CONCAT(c.class_name) AS 所在班级
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FROM sys_user u
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INNER JOIN student_class sc ON u.user_id = sc.student_id
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INNER JOIN class c ON sc.class_id = c.id
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WHERE sc.status = 1
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AND u.del_flag = '0'
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GROUP BY u.user_id, u.nick_name
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HAVING COUNT(*) > 1
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LIMIT 20;
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-- 4.2 班级存在无效分配的情况
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SELECT
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c.class_name AS 班级,
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COUNT(*) AS 总分配数,
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SUM(CASE WHEN sc.status = 1 THEN 1 ELSE 0 END) AS 有效分配,
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SUM(CASE WHEN sc.status = 0 THEN 1 ELSE 0 END) AS 无效分配
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FROM class c
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INNER JOIN student_class sc ON c.id = sc.class_id
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INNER JOIN sys_user u ON sc.student_id = u.user_id
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WHERE u.del_flag = '0'
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GROUP BY c.class_name
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HAVING SUM(CASE WHEN sc.status = 0 THEN 1 ELSE 0 END) > 0
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ORDER BY 无效分配 DESC
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LIMIT 10;
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-- ========================================
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-- 5. 索引优化建议
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-- ========================================
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SELECT '检查索引情况...' AS step;
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-- 检查student_class表的索引
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SHOW INDEX FROM student_class;
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-- 建议添加的索引（如果不存在）
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-- CREATE INDEX idx_student_status ON student_class(student_id, status);
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-- CREATE INDEX idx_class_status ON student_class(class_id, status);
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-- ========================================
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-- 6. 表空间优化
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-- ========================================
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SELECT '优化表空间...' AS step;
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-- 优化student_class表（整理碎片）
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OPTIMIZE TABLE student_class;
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-- 优化sys_user表
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OPTIMIZE TABLE sys_user;
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SELECT '✓ 表空间优化完成' AS result;
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-- ========================================
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-- 完成
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-- ========================================
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SELECT '========================================' AS separator;
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SELECT '✅ 数据库维护完成' AS status;
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SELECT NOW() AS 完成时间;
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SELECT '========================================' AS separator;
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-- 建议：
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-- 1. 每周运行一次此脚本
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-- 2. 导入大量数据后运行此脚本
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-- 3. 发现数据问题时运行此脚本
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