如何在准备好的语句java中使用特殊字符

Question

im not so frequent user of like clause, but now i have requirement i want fetch some files based on it name . i tried with

"SELECT *  FROM FILES WHERE FILENAME LIKE "+"%"+"?"+"%";

next i tried with escaping the character

 "SELECT *  FROM FILES WHERE FILENAME LIKE "+"\\%"+"?"+"\\%";

both the ways when i create prepared statement and execute its giving error ,

please help me how can i use % ?

Thanks in advance

Answer 1

Just do this:

"SELECT *  FROM FILES WHERE FILENAME LIKE ?";

Then pass the parameter through as

"%.jpg"

Or use whatever wildcards you desire.

Eg

PreparedStatement st = connection.prepareStatement("SELECT *  FROM FILES WHERE FILENAME LIKE ?");
st.setString(1, "%.jpg");
ResultSet rs = st.executeQuery();

Answer 2

I agree with cowls answer, but I think you also want a percent sign after the search string, based on your initial post.

So, something like:

"%myfilename%"