Ing. Mariano Martínez Peck

Transcription

1 Smalltalk Programmer Ing. Mariano Martínez Peck

2 SqueakDBX The complete andg N I T open-sourceesolution to K R relational database A M access

3 SqueakDBX team Mariano M. Peck Esteban Lorenzano Germán Palacios Hernán Cassinelli

4 F.A.Q Who are we? How did it begin? What is actually SqueakDBX?

5 RDBMS VS. OODB Please, don't fight ;)

6 Anyway, we rather program in objects and use RDBMS than using Java with RDBMS ;)

7 Survey 1/2 How many times were you forced to use a particular database?

8 Survey Which databases? 2/2

9 Squeak's current situation Only MySQL and PostgreSQL native drivers. Limited ODBC driver Glorp in Squeak only works with PostgreSQL

10 We are in trouble... Direct SQL queries: 20% Using GLORP: 8.52%

11 Our goal Direct SQL queries: 100% Using GLORP: 100%

12 Our purpose

13 OpenDBX architecture Oracle uses and and libclntsh. MySQL usesoci.h mysql.h libmysqlclient_r. Common API N functions. It has M functions. for all backends!!! OCIHandleAlloc(), OCIServerAttach(), Examples: mysql_real_connect(), mysql_server_end(), OCISessionEnd(), etc. mysql_real_query(), etc. Oracle client library MySQL client library PosgreSQL client library Sqlite client library SQLServer client library

14 Why OpenDBX? It is fast Simple to use Flexible Cross platform Asynchronous queries Specific RDBMS features Good documentation

15 Deployment and infrastructure PC1 Squeak image OpenDBX Database Client Library PC2 Database

16 Smalltalk and C Squeak image OpenDBX #include #include <stdio.h> <stdio.h> static static int int mysql_odbx_get_option( mysql_odbx_get_option( odbx_t*) odbx_t*) switch( switch( option option ))......

17 Smalltalk-C Connector FFI (Foreign Function Interface) Main problem: Locks the entire VM

18 Squeak ODBC driver queries VM locked time

19 OpenDBX Connector FFI (Foreign Function Interface) Main problem: Locks the entire VM Our solution: Asynchronous queries Mini VM locks Retry schema DBXQuerySettings>>timeout:

20 SqueakDBX queries VM locked time

21 Database access in Smalltalk SqueakDBX Smalltalk driver One for all databases One for each database Less time and effort More time and effort Good performace Performance issues? OSS and proprietary Only OSS Difficult to debug Easier to debug Platform dependent Platform independent FFI locks the VM Non-locking

22 SqueakDBX design SqueakDBX SqueakDBX Structure Structure (API) (API) SqueakDBX SqueakDBX Platform Platform OpenDBX OpenDBX Connector Connector FFI FFI {{ SqueakDBXPlugin SqueakDBXPlugin OpenDBX DBXConnection DBXConnectionSettings DBXResultSet DBXPlatform DBXResult DBXSpecialOptions DBXRow DBXErrorSeverity... DBXTimeSpec...

23 Showtime

24 Who can use SqueakDBX? An application Glorp Magritte-RDB SqueakSave Moe

25 Current backends and OS

26 Benchmark for PostgreSQL ms SqueakDBX Native Converted Insert Select1000 Insert Select100 tests

27 Benchmark for MySQL ms 400 SqueakDBX Native Converted Insert Select1000 Insert Select100 tests

28 Features Mini VM locks SqueakDBXPlugin Automatic fields conversion Configurable logging/trace Special RDBMS features Multistatements Automatic release of resources

29 What do we have? Enough unit tests Acceptable test coverage SmallLint runs Good enough design GLORP integration

30 Documentation Website Documented code Mailing list Benchmarks

31 What will come Complete Glorp refactor and integration More backends in more OS Large objects support Better SPs and functions support Continue with SqueakDBXPlugin Try Alien FFI Port to Smalltalk/X?

32 Glorp progress Port from Squeak to Pharo First refactor to SqueakDatabaseAccesor Driver for native driver Driver for SqueakDBX (PostgreSQL)

33 Glorp before SqueakDBX

34 Glorp after SqueakDBX

35 Special thanks to... Norbert Sendetzky GLORP Alan Knight Stéphane Ducasse

36 aconnection execute: 'select * from questions where has_answer = true' Ing. Mariano Martínez Peck marianopeck@gmail.com

37 Thank you very much

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