方法1：重建库和表
用mysqldump --no-data把建表SQL导出来，然后drop database再create database，执行一下导出的SQL文件；
方法2：生成清空所有表的SQL
select CONCAT('TRUNCATE TABLE ',table_name,';') from information_schema.tables where TABLE_SCHEMA = 'db1'
导出到文件
select CONCAT('TRUNCATE TABLE ',table_name,';') into outfile '/website/truncatetable.sql' from information_schema.tables where TABLE_SCHEMA = 'db1'
select CONCAT('TRUNCATE TABLE ',table_name,';') from information_schema.tables where TABLE_SCHEMA = 'db1'
导出到文件
select CONCAT('TRUNCATE TABLE ',table_name,';') into outfile '/website/truncatetable.sql' from information_schema.tables where TABLE_SCHEMA = 'db1'