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Update the README.md for database extension (#3916)

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* Update the README.md for database extension

* Update README.md

* Add instructions to extend with other vendors

Co-authored-by: Antonin Delpeuch <antonin@delpeuch.eu>
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Thad Guidry 2021-05-17 17:34:58 -05:00 committed by GitHub
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This project is an extension for OpenRefine that provides a way to import database data using JDBC. This project is an OpenRefine extension for importing database data using JDBC.
For exporting to a database, other code can be found under folder `OpenRefine/main/src/com/google/refine/exporters/sql`
## Adding support for other database vendors
INSTALL 1. You'll want to register an additional Database Service: https://github.com/OpenRefine/OpenRefine/blob/master/extensions/database/src/com/google/refine/extension/database/DatabaseService.java
2. Provide the connection and service classes, look at the PostgreSQL one or MySQL one as examples: https://github.com/OpenRefine/OpenRefine/tree/master/extensions/database/src/com/google/refine/extension/database
1. Before installing this extension download OpenRefine code from http://code.google.com/p/google-refine/source/checkout. 3. Then wire up the interface with defaults as desired: https://github.com/OpenRefine/OpenRefine/blob/master/extensions/database/module/scripts/index/database-source-ui.js#L93
4. Add drivers manually to the classpath, or update the pom file to provide them as dependencies as other DB libraries are done: https://github.com/OpenRefine/OpenRefine/blob/master/extensions/database/pom.xml
2. Pull this extension's code into folder database under folder /extensions.
For more information on how to write a OpenRefine extensions and where to put the files see http://code.google.com/p/google-refine/wiki/WriteAnExtension
The folder structure should resemble this:
grefine-all/
----------/extensions
--------------/database
------------------/module
------------------/src
------------------build.xml
------------------README (this file)
3. Update build.xml in folder /extensions with build and clean ant tasks for database:
<project name="google-refine-extensions" default="build" basedir=".">
<target name="build">
<echo message="Building extensions" />
<ant dir="sample/" target="build" />
<ant dir="jython/" target="build" />
<ant dir="gdata/" target="build" />
<ant dir="database/" target="build" />
</target>
<target name="clean">
<echo message="cleaning extensions" />
<ant dir="sample/" target="clean" />
<ant dir="jython/" target="clean" />
<ant dir="freebase/" target="clean" />
<ant dir="gdata/" target="clean" />
<ant dir="database/" target="clean" />
</target>
</project>
4. If using Eclipse, make sure that you build project with ant