sql字段值包含在字符串中

Question

I have a table in my database with the structure something like that: ID , category , county , keyword

Now I have the category, the county and some text.

I want to take from my database the rows with the category, county that I have, BUT also the 'keyword' must be in my text

select from `posts` where `category`='$category' and `county`='$county'

Can anyone help me with the third condition ( 'keyword' must be in my $text )? Thank you!

Answer 1

If you mean the text of column keyword should be contained anywhere in the $text variable, then use

select ID,category,county,keyword
  from `posts`
 where `category`='$category' and `county`='$county'
   and '$text' like concat('%', `keyword`, '%')

Actually, to prevent SQL injection, it would be better to use a prepared statement using parameters for $category , $county , and $text to prevent SQL injection.