Slick-pg 介绍
Slick-pg 是一些针对 Postgresql 的 Slick 扩展,用于支持
Postgresql 的(特有)类型及/或相关函数。如果你对使用 Slick 来开发基于
Postgresql 的程序感兴趣,那么你会发现 slick-pg 非常有用。
有了它,我们就可以在 Scala/Slick 项目里自由的使用那些 Postgresql 特有的、因而
Slick 肯定不会内置支持的那些数据类型及其操作/函数来构造 sql 查询了:
import MyPostgresDriver.simple._ class TestTable(tag: Tag) extends Table[Test](tag, Some("xxx"), "Test") { def id = column[Long]("id", O.AutoInc, O.PrimaryKey) def during = column[Range[Timestamp]]("during") def location = column[Point]("location") def text = column[String]("text", O.DBType("varchar(4000)")) def props = column[Map[String,String]]("props_hstore") def tags = column[List[String]]("tags_arr") def * = (id, during, location, text, props, tags) <> (Test.tupled, Test.unapply) } object tests extends TableQuery(new TestTable(_)) { /// def byId(ids: Long*) = tests.filter(_.id inSetBind ids).map(t => t) // will generate sql like: select * from test where tags && ? def byTag(tags: String*) = tests.filter(_.tags @& tags.toList.bind).map(t => t) // will generate sql like: select * from test where during && ? def byTsRange(tsRange: Range[Timestamp]) = tests.filter(_.during @& tsRange.bind).map(t => t) // will generate sql like: select * from test where case(props -> ? as [T]) == ? def byProperty[T](key: String, value: T) = tests.filter(_.props.>>[T](key.bind) === value.bind).map(t => t) // will generate sql like: select * from test where ST_DWithin(location, ?, ?) def bydistance(point: Point, distance: Int) = tests.filter(r => r.location.dWithin(point.bind, distance.bind)).map(t => t) // will generate sql like: // select id, text, ts_rank(to_tsvector(text), to_tsquery(?)) // from test // where to_tsvector(text) @@ to_tsquery(?) // order by ts_rank(to_tsvector(text), to_tsquery(?)) def search(queryStr: String) = tests.filter(tsvector(_.text) @@ tsQuery(queryStr.bind)) .map(r => (r.id, r.text, tsRank(tsvector(r.text), tsQuery(queryStr.bind)))) .sortBy(_._3) } ...
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ARRAY
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JSON
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Date/Time
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Enum
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Range
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HStore
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LTree
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Inet/MacAddr
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text Search
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postgis Geometry
- inherits
- Composite type (basic)
- aggregate functions
- window functions
Slick-pg 官网
https://github.com/tminglei/slick-pg
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