How to use SQL "LIKE" operator in SLICK - scala

Question

Maybe a silly question. But I have not found an answer so far. So how do you represent the SQL's "LIKE" operator in SLICK?

Answer 1

Exactly as you normally would!
val query = for {
coffee <- Coffees if coffee.name like "%expresso%"
} yield (coffee.name, coffee.price)
Will generate SQL like
SELECT name, price FROM coffees WHERE NAME like '%expresso%';

Answer 2

This is how I got it to work:
// argMap is map of type [Str, Str]
val query = for {
coffee <- coffees if (
argMap.map{ case (k,v) =>
metric.column[String](k) like s"%${v}%"
}.reduce(_ && _)
)
} yield(coffee.name)
And then you can run this using your db:
val res = db.run(query.result)
Of course res is a future here that you need to use await to get the actual result.

Answer 3

Suppose you have a table named, logs with 3 fields -
id
message
datetime
You want to perform LIKE operation. So it will be:
def data(data: ReqData): Future[Seq[Syslog]] = {
sysLogTable
.filter(_.datetime >= data.datetimeFrom)
.filter(_.datetime <= data.datetimeUntil)
.filter(_.message like s"%${data.phrase}%")
.result
}
Note: for sysLogTable
val sysLogTable: TableQuery[SyslogsTable] = TableQuery[SyslogsTable]
class SyslogsTable(tag: Tag) extends Table[Syslog](tag, "logs") {
def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
def message = column[String]("message")
def datetime = column[Timestamp]("date")
def * = (id.?, message, datetime) <> ((Syslog.apply _).tupled, Syslog.unapply)
}
Note: for Syslog case class
case class Syslog(
id: Option[Long],
message: String,
datetime: Timestamp
)