MySQL高效安全地清空多张表的数据的方法

TRUNCATE TABLE users;
TRUNCATE TABLE orders;
TRUNCATE TABLE logs;

-- 关闭外键约束检查
SET FOREIGN_KEY_CHECKS = 0;

TRUNCATE TABLE parent_table;
TRUNCATE TABLE child_table;

-- 恢复外键约束检查（重要！）
SET FOREIGN_KEY_CHECKS = 1;

DELETE FROM users;
DELETE FROM orders;
DELETE FROM logs;

ALTER TABLE users AUTO_INCREMENT = 1;
ALTER TABLE orders AUTO_INCREMENT = 1;

START TRANSACTION;

DELETE FROM child_table;
DELETE FROM parent_table;

-- 检查无误后提交
COMMIT;

-- 或出现问题时回滚
-- ROLLBACK;

-- 生成 TRUNCATE 脚本（推荐用于无外键环境）
SELECT CONCAT('TRUNCATE TABLE `', table_name, '`;') AS sql_statement
FROM information_schema.tables
WHERE table_schema = 'your_database_name'
  AND table_type = 'BASE TABLE'
ORDER BY table_name;

-- 生成 DELETE 脚本（更安全）
SELECT CONCAT('DELETE FROM `', table_name, '`;') AS sql_statement
FROM information_schema.tables
WHERE table_schema = 'your_database_name'
  AND table_type = 'BASE TABLE';

-- 1. 导出表结构（不含数据）
mysqldump -u root -p --no-data your_db > schema.sql

-- 2. 删除并重建数据库
DROP DATABASE your_db;
CREATE DATABASE your_db CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- 3. 重新导入结构
mysql -u root -p your_db < schema.sql

SELECT 
  CONSTRAINT_NAME,
  TABLE_NAME,
  COLUMN_NAME,
  REFERENCED_TABLE_NAME,
  REFERENCED_COLUMN_NAME
FROM information_schema.KEY_COLUMN_USAGE
WHERE REFERENCED_TABLE_SCHEMA = 'your_db'
  AND REFERENCED_TABLE_NAME IS NOT NULL;

-- 批量生成重置语句
SELECT CONCAT('ALTER TABLE `', table_name, '` AUTO_INCREMENT = 1;')
FROM information_schema.tables
WHERE table_schema = 'your_db';

-- =============================================
-- MySQL 多表清空脚本模板（TRUNCATE 方式）
-- 请替换 your_database_name 为实际库名
-- =============================================

SET @db_name = 'your_database_name';

-- 关闭外键检查
SET FOREIGN_KEY_CHECKS = 0;

-- 清空所有用户表（按名称排序）
-- 注意：此部分需手动执行生成的语句，或通过程序拼接
-- SELECT CONCAT('TRUNCATE TABLE `', table_name, '`;')
-- FROM information_schema.tables
-- WHERE table_schema = @db_name AND table_type = 'BASE TABLE';

-- 示例（请根据实际情况填写）：
-- TRUNCATE TABLE users;
-- TRUNCATE TABLE orders;
-- TRUNCATE TABLE products;

-- 恢复外键检查
SET FOREIGN_KEY_CHECKS = 1;

-- 可选：优化表空间（InnoDB 下效果有限）
-- OPTIMIZE TABLE users, orders, products;