Anorm 使用 LIKE 子句过滤查询

Question

Using scala play anorm and mysql, I try to make a sql query, filtering using a LIKE operator:

import java.sql.Connection
import anorm._

Class.forName("com.mysql.jdbc.Driver").newInstance()
implicit val conn = java.sql.DriverManager.getConnection(dbUrl)
val list = SQL"select firstName from person where lastName like '%tra%'".as(parser.*)

Exception in thread "main" java.lang.RuntimeException: No parameter value for placeholder: 1

here it should filter all persons whose lastName contains the 'tra' string. why is it not working? is anorm (or java dbc) treating '%' as a special character? if so, how to escape this?

Answer 1

If you expected WHERE clause is something like '%pattern%' you will have to prepare string before passing it as argument.

SQL"""SELECT firstName FROM person WHERE lastName LIKE ${"%"+tra+"%"}""".
as(userParser.*)