将LIKE中的单引号插入JDBC准备的语句中

Question

I'm implementing a search using a keyword over database rows. I have to execute this query using a JDBC prepared statement.

SELECT id, name, ci FROM clients WHERE LOWER(name) LIKE '%keyword%'

What i tried was:

ps = getConnection().prepareStatement("SELECT id, 
                                              name, 
                                              ci 
                                       FROM clientes 
                                       WHERE LOWER(name) LIKE '%?%'");

If i write this, the system find rows that have the ? symbol at start or end. And obviously the below statement fails saying that the query doesn't have an argument to pass to.

ps.setString(1, keyword);

Same way with:

SELECT id, nombre, ci FROM clientes WHERE LOWER(nombre) LIKE %?%

Any help is very appreciated

Answer 1

尝试使用如下形式的SQL文本：

... LIKE CONCAT('%', ? , '%')

Answer 2

Your prepared statement should be

SELECT id, name, ci FROM clients WHERE LOWER(name) LIKE ?

then you can set the parameter to %keyword% .