sql 注入学习 sql注入猜解 1 2 3 4 5 6 7 8 9 10 11 -- 猜字段数 union select 1,2 -- -- 猜数据库 select schema_name from database.schemata -- 猜数据表列 select * from table_name select table_name from database.tables where table_schema = "aaa" -- 获取某列内容 select * from column_name