Difference between revisions of "PostgreSQL Adapter"

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(Phase 3: Test first design)
(Phase 3: Test first design)
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* 1- [[PostgreSQL_Adapter-nexj/scripts | Create a PostgreSQL database through some scripts]]
 
* 1- [[PostgreSQL_Adapter-nexj/scripts | Create a PostgreSQL database through some scripts]]
  
* 3- Working inside Schema 'test'
+
* 2- [[PostgreSQL_Adapter-nexj/schema-test |  Working inside Schema 'test']]
 
 
: <code> CREATE TABLE test.xxx </code>
 
:: data types are changed in <code> appendColumnType() </code> in ''PostgreSQLSchemaManager.java'' based on each jdbc type's equivalent in PostgreSQL.
 
:: 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.xxx </code>
 
: <code> CREATE Trigger test.xxx // if it's needed for PostgreSQL as well as MySQL</code>
 
 
 
* Modifications
 
{|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;"| '''Changes Done to MySQL adapter'''
 
|-
 
|
 
: When a connection is first established, this initial SQL statement should execute in MySQL, which is not the case for PostgreSQL, so it was commented out:
 
::
 
<source lang=java>
 
/* MySQLAdapter.java */
 
 
 
public String getInitialSQL()
 
  {
 
      StringBuffer buf = new StringBuffer();
 
 
 
      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>
 
 
 
|}
 
{|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;"| '''Files to Configure'''
 
|-
 
|
 
:src
 
:: [[ PostgreSQL_Adapter-nexj/Adapter | PostgreSQLAdapter.java ]]  // Extends SQLAdapter.java  - SQL Persistence adapter, responsible for regular data queries (insert, select, delete)
 
:: [[ PostgreSQL_Adapter-nexj/SchemaManger | PostgreSQLSchemaManager.java ]]  // Extends SQLSchemaManager.java - class for reading, creating and upgrading the database schema
 
:: [[ PostgreSQL_Adapter-nexj/Upgrade | main.upgrade ]]
 
: test
 
:: [[ PostgreSQL_Adapter-nexj/AdapterTest | PostgreSQLAdapterTest.java ]]] // Extends SQLAdapterTest.java
 
:: [[ PostgreSQL_Adapter-nexj/SchemaMangerTest | PostgreSQLSchemaManagerTest.java ]] // Extends SQLSchemaManagerTest.java
 
: Script - scripts are being processed through SQLDataTest.java
 
:: postgresql_setup.sql
 
:: TO be cond'
 
|}
 
  
 
===Phase 4: Test properties specific to PostgreSQL ===
 
===Phase 4: Test properties specific to PostgreSQL ===

Revision as of 11:31, 10 December 2010

PostgreSQL Adapter for NexJ

Project Goal

Develope an adapter to enable NexJ Express model to interact with PostgreSQL database

Current Status

Project Phases

Phase 1: Investigation

  • Get requirements from NexJ (Meeting on Friday Nov 5th)
  • Walk-through the code
  • Familiarization with PostgreSQL

Phase 2: Connect to PostgreSQL

Phase 3: Test first design

Phase 4: Test properties specific to PostgreSQL

  • Add test cases that are specific to PostgreSQL database

Phase 5: Optimization

  • After implementation is done, optimizing the modified files.

Resources

  • Intro
Concept of Adapter [1]
FOSSLC PostgreSQL