Slick: How can I combine a SQL LIKE statement with a SQL IN statement


I basically would like to replace the following code with something more "slicky":

final case class User(firstName: String, lastName: String) def dbAction(lastNameParts: Seq[String]): SqlStreamingAction[Vector[User], User, Effect] implicit val getUserResult = GetResult((r: PositionedResult) => { val resultSet: ResultSet = r.rs User( resultSet.getString(1), resultSet.getString(2) ) }) val pattern = orgIds.mkString("|") sql"""SELECT u.first_name, u.last_name FROM users u WHERE last_name ~* $pattern""".as[User]

So the resulting SQL would be:

SELECT u.first_name, u.last_name FROM users u WHERE last_name ~* '%bar|baz%';

So this dbAction will return an action which I can use to Query for all users having some name parts included in a list.


dbAction(Seq("bar", "baz"))

will return an action querying for all last names containing the strings "bar" or "baz" (case insensitive). I found a way to query for a single pattern

val query = for { user <- users if user.lastName like "%bar%" } yield (user.firstName, user.lastName)

and I found a way to query for list inclusion

u <- users if u.lastName.inSet(Seq("bar", "baz"))

but could not find a way to combine that

EDIT: Another way to possibly solve that would be via a regular expression. Is there a way to achieve something like the following SQL statement:

select * from users where last_name ~ '[\w]*bar[\w]*|[\w]*baz[\w]*';

Since this is somehow a different question how to use a regex I created a different question for this: <a href="https://stackoverflow.com/questions/46218122/slick-is-there-a-way-to-create-a-where-clause-with-a-regex" rel="nofollow">Slick: Is there a way to create a WHERE clause with a regex?</a>


Looking at the code you've posted, I didn't think you needed to literaly combine an IN with a LIKE. I read the question as wanting to do a regular expression query. Although Slick doesn't support the ~* operator out of the box, you can add it yourself. That would give you a way to execute the query using the <em>lifted embedded</em> style of Slick query.

To do that, you can use the SimpleExpression builder. There's not much documentation on it, but the jumping off point would be the <a href="http://slick.lightbend.com/doc/3.2.1/userdefined.html#scalar-database-functions" rel="nofollow">Scalar Database Functions</a> page of the reference manual.

What we want to do is write a method along these lines:

def find(names: Seq[String]): DBIO[Seq[String]] = { val pattern = names.mkString("|") users.filter(_.lastName regexLike pattern).map(_.lastName).result }

To get regexLike we can enrich (enhance, "pimp") a string column to have the regexLike method:

implicit class RegexLikeOps(s: Rep[String]) { def regexLike(p: Rep[String]): Rep[Boolean] = { val expr = SimpleExpression.binary[String,String,Boolean] { (s, p, qb) => qb.expr(s) qb.sqlBuilder += " ~* " qb.expr(p) } expr.apply(s,p) } }

The implicit class part is allow the compiler to construct the RegexLikeOps class anytime it has a Rep[String] that calls a method that Rep[String] doesn't already have (i.e., when regexLike is asked for).

Our regexLike method takes another Rep[String] argument as the pattern, and then uses SimpleExpression builder to safely construct the SQL we want to use.

Putting it all together we can write:

val program = for { _ <- users.schema.create _ <- users ++= User("foo") :: User("baz") :: User("bar") :: Nil result <- find( Seq("baz","bar") ) } yield result println( Await.result(db.run(program), 2.seconds) )

The SQL generated (in my test with H2) is:

select "last_name" from "app_user" where "last_name" ~* 'baz|bar'

The full code is: <a href="https://github.com/d6y/so46199828" rel="nofollow">https://github.com/d6y/so46199828</a>


Just combine these 2 query conditions:

import slick.lifted.Tag import slick.jdbc.H2Profile.api._ import scala.concurrent.duration._ import scala.concurrent.Await object Test { final case class User(firstName:String, lastName:String, id:Long = 0l) class UserTable(tag: Tag) extends Table[User](tag, "user"){ def id = column[Long]("id", O.PrimaryKey, O.AutoInc) def firstName = column[String]("first_name") def lastName = column[String]("last_name") def * = (firstName, lastName, id).mapTo[User] } def main(args:Array[String]):Unit = { val db = Database.forConfig("h2config") val users = TableQuery[UserTable] val initialData = Seq( User("Alex", "Arendar"), User("David", "Arora"), User("Dude", "Stoecki"), User("Alexander", "the Great") ) Await.result( db.run( users.schema.create andThen (users ++= initialData) ), 3 seconds ) val query1 = for { user <- users if user.firstName like "%Alex%" } yield (user.firstName, user.lastName) println(query1.result.statements.head) println(Await.result(db.run(query1.result), 3 seconds)) val query2 = for { user <- users if (user.firstName like "%Alex%") && user.firstName.inSet(Seq("Alex", "David")) } yield (user.firstName, user.lastName) println(query2.result.statements.head) println(Await.result(db.run(query2.result), 3 seconds)) db.close() }

My console output is:

select "first_name", "last_name" from "user" where "first_name" like '%Alex%' Vector((Alex,Arendar), (Alexander,the Great)) select "first_name", "last_name" from "user" where ("first_name" like '%Alex%') and ("first_name" in ('Alex', 'David')) Vector((Alex,Arendar)) Process finished with exit code 0

As you can see generated SQL does contain both like and in parts.

I used in-memory H2 database here but I think this shall work with any RDBMS.


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