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Example of an implementation of SQL as a DSL in scala
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src implemented a basic SQL parser, roundtrip works now Nov 26, 2009



Scala implementation of a really small subset of the SQL language

To understand how to write DSLs (internal/external) in Scala I started implementing a small subset of the SQL language.


  • select operation with fields
  • where clause with (typed) equals, in, and, or
  • order
  • A ‘renderer’ to create a SQL String from the given Query object

Scala SQL DSL lets you write stuff like:

scala> val q = select ("*") from ("user") where (("name","peter") and (("active", true) or ("role", "admin")))
scala> q.sql
res0: java.lang.String = select * from user where (name = 'peter' and (active = true or role = 'admin'))

Or using the parser:

scala> val sql = """select name,age from users where name = "peter" and (active = true or age = 30)"""
scala> val query = p.parse(sql).get
scala> AnsiSqlRenderer.sql(query)
res0: java.lang.String = select name,age from users where (name = 'peter' and (active = true or age = 30))

Prerequisites for building / running tests


The spec contains various examples on how to write queries. But basically you start by:

  • Import all functions/implicits in the QueryBuilder object: import QueryBuilder._
  • Import the AnsiSqlRenderer object: AnsiSqlRenderer._


Written by Peter Maas


This software is licensed under the Apache 2 license, quoted below.

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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