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PostgreSQL Adapter

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{{Admon/obsolete}}
 
<big><big> PostgreSQL Adapter for NexJ </big></big>
{{NexJ_Express Index}}
[[category: NexJ Past Projects]]
[[category: NexJ Express PostgreSQL]]
 
== Project Goal==
Develope Develop an adapter to enable NexJ Express model to interact with PostgreSQL database. ===Contributors===* [[User:Gbatumbya|Grace Batumbya]]* [[Minooz/Projects | Minoo Ziaei]]* [[User:AnastasiaS | Anastasia Semionova]]  === Supported PostgreSQL Versions===* 8.4+ 
== Current Status==
* '''Completed''' (October 21, 2011)* Get the last PostgreSQL adapter source code from http://mercurial.nexj.com/express.cgi/core <!--{|class="collapsible collapsed" style="border-style:solid;border-width:thin;border-color:black"
!align="left" style="background-color:SteelBlue; font-weight:bold;border-style:solid;border-width:thin;padding: 2px 2px 2px 2px;"| Dec 2010
|-
* Application is now connected to the Postgre database.
|}
 * [[PostgreSQL_Adapter-nexj/test-env/todo |TODOs]]>
==Project Phases==
=== Phase 1: Investigation (DONE) ===
* Get requirements from NexJ (Meeting on Friday Nov 5th)
* Walk-through the code
* Familiarization with PostgreSQL  === Phase 2: Connect to PostgreSQL server (DONE) ===* [[NexJ_Express_Connecting_to_PostgreSQL| Connect to PostgreSQL server]]
=== Phase 23: Connect to PostgreSQLPostgreSQLSchemaManager (DONE) ===* [[PostgreSQL_AdapterEstimated Duration: 3 weeks (Jan 17 -nexj/test-env | Create Test Environment]]Feb 11, 2011)* [[PostgreSQL_AdapterPostgreSQL Adapter-nexj/test-env/files extendingSchemaManager | Files to ModifyExtending SQLSchemaManager ]]
=== Phase 34: Test first design PostgreSQLAdapter (DONE)===* 1Estimated Duration: 3 weeks (Feb 14 - Create a PostgreSQL database through some scripts: Through the process in postgresql_setup.sql25, the database was created, initialized and tested:2011):: A database called 'test is created in PostgreSQL : <code> CREATE DATABASE test </code>:: To create a <code>user</code> along with <code>password</code>: <code> CREATE USER test WITH PASSWORD 'test'; </code>:: Login to the database 'test' with username 'test': <code> psql * [[PostgreSQL_Adapter-U test test </code>:: Create a <code> Schema </code> called 'test' inside the database 'test' with particular owner 'test': <code> CREATE SCHEMA test AUTHORIZATION test;</code>:: Create a <code>table</code> called 'Mutex' with primary key: <code> CREATE TABLE test.Mutex(id INT PRIMARY KEY); </code>:: Insert a value into the primary key: <code> INSERT INTO test.Mutex(id) VALUES (1); <nexj/code>extendingSQLAdapter | Extending SQLAdapter ]]
===Phase 5: PostgreSQL UnitTests and Optimization (DONE) ===* 3Estimated Duration: 2 weeks (Feb 28 - Working inside Schema 'Mar 11, 2016)* Add database specific tests fostr PostgreSQL*:test'for required contrib scripts*:test for custom blob read & write functions* Add PostgreSQL specific optimization
===Phase 6: <code> CREATE TABLE test.xxx </code>:: data types are changed in <code> appendColumnTypeMegre Code with Latest Revision (DONE) </ ===* Merge code> in ''PostgreSQLSchemaManager.java'' based on each jdbc type's equivalent in PostgreSQL.with lastest revision from http:: The implementation in <code> crateTextTable </code> in file ''PostgreSQLSchemaManager.java'' is removed for now (base class's version is being called).: <code>CREATE INDEX test/mercurial.xxx </code> : <code> CREATE Trigger testnexj.xxx // if it's needed for PostgreSQL as well as MySQL<com/code>express
===Phase 7: Test with NexJ Express Studio (DONE) ===* Estimated duration: Mar 7- Apr 14, 2011* Run model in Express studio using the postgresql adapter* create scripts for database initialization, creation and dumping* Modificationscreate scripts for JBoss{|class* Deploy to JBoss =="collapsible collapsed" style="borderPhase 8: Code Review 1 -styleMeeting (DONE) ===* Date: Apr 20,2011 * Meet with NexJ Developer to review code === Phase 9:solid;borderCode Review 1 -widthApply Changes (DONE) ===* Estimated Duration:thin;borderApr 20, 2011 -colorJuly 1, 2011* [[PostgreSQL_Adapter_Project_-_Code_Review_1_Changes | Changes to be made]] === Phase 10:black"Code Review 2 (DONE) ===* Send code for review* !align="left" style="background-color= Phase 11:SteelBlue; fontCode Review 2 -weightApply Changes (DONE) ===* Estimated Duration:bold;borderJuly 7, 2011 -style:solid;borderJuly 15, 2011* [[PostgreSQL_Adapter_Project_-width:thin;padding: 2px 2px 2px 2px;"_Code_Review_2_Changes | '''Changes Done to MySQL adapter''' be made]] === Phase 12: Code Review 3 (DONE) ===* Sent code for code review 3* https://bitbucket.org/gbatumbya/postgresql_external/src/08cdedb9d071/ |=== Phase 13: Code Review 3 - Apply Changes (DONE) ===* Upgrade to lastest 7.1 branch|* Create Statement and PreparedStatementProxy* Create PostgreSQLPreparedStatementProxy: When a connection is first established, ** implement set/getQueryTimeout** move custom timeout code into this initial SQL statement should execute proxy* Override prepareStatement in MySQL, which is not PostgreSQL to return PostgreSQLPreparedStatementProxy* Implement implicit save points for statements within a transaction block* Modify readSchema to use addColumn for reading columns from the case database** Remove MSSQL and Oracle specific code from addColumn** Override addColumn in PostgreSQL for PostgreSQLtext, so it was commented outbytea and lo types === Phase 14:Integration Tests (DONE) ===* Run Integration tests against the Adapter === Phase 15:Code Review 4 (DONE)===* Code review with framework architect* https://bitbucket.org/gbatumbya/postgresql_external/src/6c9a7380c8fe <source lang=java>== Phase 16: Code Review 4 - Apply Changes (DONE) ===* Estimated Duration: Sep 9 - Sep 12* [[PostgreSQL_Adapter_Project_-_Code_Review_4_Changes | Changes to be made]] === Phase 17: Code Review 5 (DONE) ===/* MySQLAdapterSubmitted code for review on Sep 20.java *https://bitbucket.org/gbatumbya/postgresql_external/src/a0d10ef7cdbe/ === Phase 18: Code Review 5 - Apply Changes (DONE) ===
public String getInitialSQL()=== Phase 19: Code Review 6 ===* Date: Oct 13 {* Submitted for code review StringBuffer buf = new StringBuffer();* https://bitbucket.org/gbatumbya/postgresql_external/src/153aec847d54/
buf.append("set sql_mode = concat(@@sql_mode, ',ANSI_QUOTES')"); // allow using doublequote when quoting column names in "CREATE TABLE" statements
buf.append(";set optimizer_search_depth = 0"); // let DB automatically decide on how long it takes to examine plans, improves long planning sessions
buf.append(";set max_sort_length = ").append
(Math.max(MAX_VARCHAR_PRECISION, MAX_VARBINARY_PRECISION)); // set TEXT/BLOB minimum sorting length to be same as cutoff between varchar/text
return buf.toString();
}
</source>
: Also the same line should be commented out in postgresql_create.sql script, which is being used to create tables in the database 'test':
::
<source lang=java>
/* nexj/core/persistence/sql/etc/postgresql_create.sql */
set sql_mode = concat(@@sql_mode, ',ANSI_QUOTES');
</source>
: After activating the connection, the database is locked.
: In MySQL, the storage engine is set to a transactional safe engine such as [http://www.wikivs.com/wiki/MySQL_vs_PostgreSQL#MySQL:InnoDB InnoDB], whereas PostgreSQL has a single built in engine. So, changes needed to be done to this script:
::
<source lang=java>
create table test.Account(
id binary(16) not null, contactId binary(16) not null, account Type varchar(16) character set utf8 not null, funds double null,
constraint Account_PK primary key(id)
)engine=innoDB;
</source>
|}
==Project Repository =Phase 4=* URL for central repository of the project is: Test properties specific to PostgreSQL ===https://bitbucket.org/gbatumbya/nexjexpress-postgresqladapter
* Add test cases that are specific Steps to PostgreSQL databasework with the repository
=== Phase :1- Follow the [https://www.projects.openhealthtools.org/sf/docman/do/downloadDocument/projects.oht_aip/docman.root.nexj_studio_express_v7_1_113_0/doc1783/1 instructions to create the NexJ Express workspace ].:2- After creating 'ws' directory,::open Eclipse and::click on '''File -> Import -> Mercurial -> Clone Existing Mercurial Repository''':: Enter this information:::: '''URL''': https://bitbucket.org/gbatumbya/nexjexpress-postgresqladapter<!--:3- The central repository's structure is::: Main branch called 'default' :: Branches for:4- After cloning the project, follow these steps to add a new branch with your user name::: First make sure the active branch is 'default'. Notice the top of the Package Explorer e.g. ''core[5: Optimization===b8b2f102343@'''default'''(tip)]'':: Right click on 'core' in the Package Explorer:: Click on 'Team' -> Add Branch:: Enter the branch name in the box -> Finish:: Enter the commit message -> OK:: Check the 'Force Push' if applicable.:: Now the branch name at the top of Package Explorer is changed to the new branch name. : 5- To switch to a different branch, choose 'Switch' instead of 'Add Branch'
*After implementation is done'''NOTE!''' To avoid any conflict, optimizing do the modified files'Pull' every day and before any push.* '''NOTE!''' First just 'Commit' changesets and do not 'Push' them until the end of the day or the time you are confident by latest changes to the code, then 'Push' them all at once and 'Merge' them with the 'default' branch in central repository.-->
== Resources ==
* Downloads
Linux binaries http://www.openscg.org/se/postgresql/packages.jsp
* Debugging
:[[Run_Junit_Tests_For_Non_Default_SQL_Adapter | Unit Testing for non Default SQL Adapter]]
:
* Intro
:Concept of Adapter [http://www.vogella.de/articles/DesignPatternAdapter/article.html]
* [[PostgreSQL_Adapter-nexj/Resources#MySQL_Specifications | MySQL Specifications]]
* [[PostgreSQL_Adapter-nexj/Resources#PostgreSQL_-_MySQL_Compare | Postgre - MySQL Compare]]
 
 
== Summary of Applied Research ==
* [[Research Findings - PostgreSQLAdapter]]
* [[Research Notes - PostgreSQLAdapter]]
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