View source for CDO/DB Store

The CDO DB store is an implementation of the CDO IStore that allows to store models and meta models in relational databases. It does not use 3rd party components other than database vendor-specific JDBC drivers. The DB store is a proprietary O/R mapper.

== Features  ==

*Supports all optional features of the [[#CDO_Server|CDO Server]]. 
*Pluggable SQL dialect adapters. Includes support for [[Net4j/DB/Derby|Derby]], [[Net4j/DB/H2|H2]], [[Net4j/DB/HSQLDB|HSQLDB]], [[Net4j/DB/MySQL|MySQL]], [[Net4j/DB/PostgreSQL|PostgreSQL]] and [[Net4j/DB/Oracle|Oracle]] . 
*Pluggable mapping strategies. Includes horizontal mapping strategy (one table per concrete class, no joins).
**See [http://download.eclipse.org/modeling/emf/cdo/drops/R20140610-0212/help/org.eclipse.emf.cdo.doc/html/reference/MappingStrategies.html DBStore Mapping Strategies]
*Various mapping options by using EAnnotations on model elements&nbsp;(see more in section [[#Annotations|Annotations]]).

== Configuration  ==

*Configuring the DBStore: see [[CDO/Server Configuration Reference#Element_store]].<br>

== Annotations  ==

You can define custom mappings on your model by using EAnnotations for DBStore: [http://git.eclipse.org/c/cdo/cdo.git/tree/plugins/org.eclipse.emf.cdo.server.db/src/org/eclipse/emf/cdo/server/internal/db/DBAnnotation.java DBAnnotation.java] 

In order to optimize the schema on the database, it is recommended that you define the column length, specially when using the data type String. 

Example: 
<pre>&nbsp;&lt;eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"&gt;
&nbsp; &nbsp; &nbsp;&lt;eAnnotations source="http://www.eclipse.org/CDO/DBStore"&gt;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;details key="columnType" value="VARCHAR"/&gt;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;details key="columnLength" value="255"/&gt;
&nbsp; &nbsp; &nbsp;&lt;/eAnnotations&gt;
&nbsp;&lt;/eStructuralFeatures&gt;
</pre> 
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Wikis: [[CDO]] | [[Net4j]] | [[EMF]] | [[Eclipse]]