We have just released Slick 3.1.0-RC1, the first release candidate for Slick 3.1.0. You can find the source code here: https://github.com/slick/slick/tree/3.1.0-RC1. Builds for Scala 2.10 and 2.11 are available from Maven Central, as usual.
These are the major new features since 3.0:
- New query compiler back-end. The main goal is to avoid subqueries wherever possible.
- Improved support for monadic joins in the query compiler. In particular, whenever a monadic join cannot be translated into an applicative join (as required for SQL), the query compiler will fail with a useful error message instead of producing invalid code.
- Improved configuration of database connections via Typesafe Config: You can now configure arbitrary DataSource classes with Java Bean semantics when running without a connection pool (similar to what was already supported by HikariCP).
- Configurable class loading when resolving Slick drivers: In containers which separate
parts of an application into different ClassLoaders (e.g. Play, OSGi), the previous
approach of using
Class.forNamedid not work in all cases. You can now provide a custom ClassLoader, and Slick will fall back to the context ClassLoader in other cases.
- Support for HikariCP is now in a separate module which makes it easier to depend on the correct, binary compatible version of HikariCP.
- Database connections can be configured through a DATABASE_URL syntax as used on PaaS platforms like Heroku.
- New query operators “distinct” and “distinctOn”.
- Performance improvements in the query compiler. Query compilation is now more than 2.5 times as fast as it was in 3.0.
None of the standard Activator templates are available at the moment. They will be ported to 3.1 before the final release. You can find details about upgrading from Slick 3.0 in the Migration Guide. The commercial Slick Extensions package with additional database drivers is also available for this RC. See the manual for details on adding it to your build.
Please provide feedback on the stability of this RC if you encounter any problems.
Here is a complete list of changes since 3.0.0
d2e50d4Remove dependent types for
5cbabf6Add documentation for default string type changes
ebfb344Ensure non-empty “select” clauses in mergeToComprehensions:
f82a8feBetter integration of expandConditionals into expandSums
07cd37aAllow selective translation for Take or Drop in removeTakeDrop:
dc1c551Correctly propagate a Driver object to DriverDataSource
6cb62b8Integrate expandConditionals into expandSums
d286c17Selectively skip compiler phases:
04ca00dcodegen: schema: Handle case of no tables
53cb788codegen: Test case of no tables (schema has invalid syntax)
bc90afeA simpler and faster implementation of assignUniqueSymbols
969ec5fUse correct discriminator checks under three-valued logic
e6acabfSome type-related fixes and improvements from tmp/globaltypes2
bcdeeaaPrevent retry of lazy Connection acquisition attempt in BaseSession:
1634965More intelligent handling of String types on MySQL
da7aaa9Create correct syntax for casts on MySQL
c9bdcb1More micro-optimizations and streamlining of ConstArray use
2adb7c3Use a custom collection implementation in the AST:
b48115aProfiling settings plus small performance improvements
8ac4298Only set Hikari dataSourceClassName or driverClassName but not both
8dac76fAdd two more expr customization for pg
1c9469fScalar optimization & better discriminator column picking:
b01e539More query compiler performance improvements:
b87c994Eliminate explicit outer join discriminator columns where possible
34bf73fSet Slick Extensions version in the manual independent of Slick version
3bd24ccSome small query compiler performance optimizations:
detectRebuildoption to mark rebuilt leaf nodes after each phase:
ed2af9bAdd a benchmark for the query compiler.
7333bd9More consistent Query.length (“COUNT(*)”) semantics:
16be008Fix docs and simplify (no binary compatibility constraints for 3.1)
c197fdbMove HikariCPJdbcDataSource into a separate module
b651a62Clean up the build file
764b405Avoid subqueries around zipWithIndex operations
7514666Database.forConfig uses provided config params
5ca0e5cAdd tests for the
a30d5dfFixed a mistake in the docs markup
e957544Fix the implicit conversions for Compiled queries.
ea15636Workaround SI-7139 caused by eponymous type alias and object
c762b55Improve code generation
aaf2a22Early hoisting of client-side operations:
99c2737add one more parameter
ffee22cImprove subquery fusion for Union operations
fbd2289Add the correct scala-sbt repo for resolving sbt-testng.plugin
31672a2Remove deprecated APIs
2ae5320Added documentation for DatabaseUrlDataSource
7fcd722Add a test for DatabaseUrlDataSource
f637d52Revised DatabaseUrlDataSource to have a no-arg cstr. Moved extractUrl to instance method
9cfd03eAdded a DatabaseUrlDataSource for use with DATABASE_URL
79d2e67Support Typesafe Config-based configuration of DataSource beans
4565f09Clean up the ClassLoader support from #1152:
95dad0aSet hikariCP validationTimeout from config or 1000ms
9b58a50Pin HikariCP at version 2.3.7 to match play-slick
cce3b95Remove the Direct Embedding (deprecated in 3.0)
4b7262eAdd test for resolving reference.conf in OSGi context
a9dd9a8Fix OSGi tests (did not run due to duplicate slf4j on classpath)
ff264c9Bump version numbers
b9861f1Remove obsolete code
36d5552Improve Take, Drop and zip join translation
f170783Fix type bugs and enforce correct types in the query compiler:
85df538Codegen: Suppress output of schema.create if ddlEnabled is false
4fd654fAdd Gitter badge
8baa079New Query Compiler Back-End
2b14139Early transformation of monadic joins into applicative joins.
f53f06eMove createResultSetMapping down after forceOuterBinds
1d55c69Fix view source for scaladoc and edit this file on github for docs
325f200Improve tree logging
1abf753Allow classloader to be specified for classloading
0cab15eAdd docs about DBIO composition.