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Reactive Database Access
in Scala with Slick 3
Ihor Mielientiev
AUGUST 3, 2015
2
AGENDA
What is Slick?1
Introduction To Slick2
Reactive Slick 33
Reactive Streams in Slick 34
Advices5
Pros & Cons (Summary)6
Q&A7
3
• Slick is database query and access library for Scala
• Slick IS NOT ORM it's Functional-Relational Mapper
• Brings relational model to Scala (not hidden)
• Natural fit (no impedance mismatch)
• Stateless
WHAT IS SLICK?
4
Minimal
Configuration
5
/resource/application.conf
6
Mapping
7
Slick Mapping
8
• Do mapping in Scala
• Type Safe
• No XML, no Annotations, no “magic”
Slick Mapping
9
Scala collection-like API
10
Slick Querying
Get users with age > 20
OR
11
Slick Querying
Slick Generate Next SQL (H2):
12
Slick Querying (Insert)
Inserting
Batching
Insert or update
13
Slick Querying (Insert 2)
Insert and return object
Batching with returning object
14
Slick Querying (Update / Delete)
Update
A query for an UPDATE statement must resolve to a
comprehension with a single table
Delete
A query for deleting must only select from a single table.
15
Joins
Cross Join
Inner Join
16
Joins
Left Join
Right Join
Full Join
17
Joins
It's too simple... Lets consider more complex
example.
Get all users' addresses,
who subscribed on “New York
Times“ and has age > 18 and lives
in USA
18
Joins
19
Joins (for-comprehension)
20
Joins Generated SQL
Applicative join Monadic join
21
Joins Generated SQL
If changes 'filter' order in
applicative joins...
Be careful, and look
at generated SQL
22
Transactions
- Transactions disabled by default
- To enable transaction just add .transactionally
23
Transactions
24
Pre Compiled Queries
25
Plain SQL
- Slick allows you to write your own SQL
- Plain SQL queries in Slick are built via string interpolation
using the sql, sqlu and tsql
- sqlu is used for DML statements which produce a row count
instead of a result set.
26
Plain SQL
- sql is used for statements which produce a result set.
- For mapping sql result to Model, you need to implement GetResult
27
Type-checked SQL
- Ability to type check hand-written SQL statements
Add annotation:
Use it (tsql):
28
Type-checked SQL
Bad syntax:
29
Type-checked SQL
Incorrect type:
30
Type-checked SQL
Table doesn't exist:
Field name error:
31
Type-checked SQL (Issues)
- Compilation depends on running DB
- Limited IDE support
- Increase compilation time
32
Supported Databases
- DB2 (via slick-extensions)
- Derby/JavaDB
- H2
- HSQLDB/HyperSQL
- Microsoft SQL Server (via slick-extensions)
- MySQL
- Oracle (via slick-extensions)
- PostgreSQL
- SQLite
33
Reactive Slick 3
34
Reactive Streams In Slick 3
- Reactive Streams is an initiative to provide a standard for asynchronous stream
processing with non-blocking back pressure.
http://www.reactive-streams.org/
- Reactive Streams is a “protocol” for efficiently passing data between two
independent units of execution (producer & consumer) in an asynchronous,
non-blocking and bounded fashion.
35
Advices
1. Always view on generated SQL
2. Try to get data you actually need in that moment (Query granularity)
3. Stay tuned with updates
4. Learn SQL
36
Summary
Pros
+ Full Control
+ Type Safe
+ Composable Queries
+ Reactive
+ Minimal Boilerplate
Cons
- Generated SQL is far from
perfect
- Not always intuitive
- DSL has limitations
37
Thank you
Questions?

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Reactive Database Access With Slick 3