在准备好的语句中使用“like”通配符

Question

I am using prepared statements to execute mysql database queries. And I want to implement a search functionality based on a keyword of sorts.

For that I need to use LIKE keyword, that much I know. And I have also used prepared statements before, but I do not know how to use it with LIKE because from the following code where would I add the 'keyword%' ?

Can I directly use it in the pstmt.setString(1, notes) as (1, notes+"%") or something like that. I see a lot of posts on this on the web but no good answer anywhere.

PreparedStatement pstmt = con.prepareStatement(
      "SELECT * FROM analysis WHERE notes like ?");
pstmt.setString(1, notes);
ResultSet rs = pstmt.executeQuery();

Answer 1

You need to set it in the value itself, not in the prepared statement SQL string.

So, this should do for a prefix-match:

notes = notes
    .replace("!", "!!")
    .replace("%", "!%")
    .replace("_", "!_")
    .replace("[", "![");
PreparedStatement pstmt = con.prepareStatement(
        "SELECT * FROM analysis WHERE notes LIKE ? ESCAPE '!'");
pstmt.setString(1, notes + "%");

or a suffix-match:

pstmt.setString(1, "%" + notes);

or a global match:

pstmt.setString(1, "%" + notes + "%");

Answer 2

Code it like this:

PreparedStatement pstmt = con.prepareStatement(
    "SELECT * FROM analysis WHERE notes like ?");
pstmt.setString(1, notes + "%");`

Make sure that you DO NOT include the quotes ' ' like below as they will cause an exception.

pstmt.setString(1,"'%"+ notes + "%'");

Answer 3

We can use the CONCAT SQL function.

PreparedStatement pstmt = con.prepareStatement(
      "SELECT * FROM analysis WHERE notes like CONCAT( '%',?,'%')";
pstmt.setString(1, notes);
ResultSet rs = pstmt.executeQuery();

This works perfectly for my case.

Answer 4

PreparedStatement ps = cn.prepareStatement("Select * from Users where User_FirstName LIKE ?");
ps.setString(1, name + '%');

Try this out.

Answer 5

["

String fname = "Sam\u0025";

PreparedStatement ps= conn.prepareStatement("SELECT * FROM Users WHERE User_FirstName LIKE ? ");

ps.setString(1, fname);

Answer 6

String query="select * from test1 where "+selected+" like '%"+SelectedStr+"%';";


PreparedStatement preparedStatement=con.prepareStatement(query);


// where seleced and SelectedStr are String Variables in my program