Sqli labs level 8 (Boolean blind note)

Concept ：
Bull's blind note ： Only “ really ” And “ false ” Two kinds of state , By comparing the guessed value with ASCII Code comparison returns true and false values for verification .
step ：
1. Find the closed character
2. Find the length of the current database name
3. Find the current database name ASCII value
4. Find the number of tables
5. Find the length of the table name
6. Find the... Corresponding to the table name ASCII value
7. Find the number of columns
8. Find the length of the column name
9 Find the... Corresponding to the column name ASCII value
10. Find the number of fields
11. Find the length of the field
12. Find the field correspondence ASCII value
Ideas ：
1、 Determine the injection point ：

2、 Find the length of database name ------id=1’ and length(database())=8 --+

3. Find the name of the database ASCII value ：-------------ascii(substr(database(),1,1))=115 --+

4、 Find the number of tables ：

5. Find the length of table name

6. Table name ASCII value

7. Find the number of columns
8. Find the length of column name
9. Find the... Corresponding to the column name ASCII value
10. Find the number of fields
11. Find the length of the field
12. Find the field correspondence ASCII value

To be continued ...