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Updating documentation for converting mapping information and reverse engineering databases to entities.

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Jonathan H. Wage 2010-05-18 11:49:44 -04:00
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commit 18b9c6cd69
1 changed files with 33 additions and 41 deletions
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manual/en/tools.txt
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@ -178,71 +178,63 @@ Before using the orm:schema-tool commands, remember to configure your cli-config
++ Convert Mapping Information
Doctrine comes with some special tools for working with the various supported
formats for specifying mapping information.
You have the ability to convert from a few different sources.
* An existing database
* A directory of YAML schema files
* A directory of XML schema files
* A directory of PHP scripts which populate `ClassMetadataInfo` instances
* A directory of PHP classes defining Doctrine entities with annotations
To convert a mapping source you can do everything you need with the `ClassMetadataExporter`.
To convert some mapping information between the various supported formats you can
use the `ClassMetadataExporter` to get exporter instances for the different formats:
[php]
$cme = new \Doctrine\ORM\Tools\Export\ClassMetadataExporter();
Once you have an instance you can start adding mapping sources to convert.
Once you have a instance you can use it to get an exporter. For example, the yml
exporter:
[php]
$cme->addMappingSource('/path/to/yml', 'yml');
$cme->addMappingSource('/path/to/xml', 'xml');
$cme->addMappingSource('/path/to/php', 'php');
$cme->addMappingSource('/path/to/annotations', 'annotation');
Now to convert the added mapping sources you can do so by using the exporter drivers.
[php]
$metadatas = $cme->getMetadatasForMappingSources();
$exporter = $cme->getExporter('yml', '/path/to/export/yml');
$exporter->setMetadatas($metadatas);
Now you can export some `ClassMetadata` instances:
$classes = array(
$em->getClassMetadata('Entities\User'),
$em->getClassMetadata('Entities\Profile')
);
$exporter->setMetadata($classes);
$exporter->export();
This functionality functionality is also available from the command line to for
example convert some YAML mapping files to XML.
This functionality is also available from the command line to convert your
loaded mapping information to another format. The `orm:convert-mapping` command
accepts two arguments, the type to convert to and the path to generate it:
$ php doctrine orm:convert-mapping /path/to/mapping-path xml /path/to/mapping-path-converted-to-xml
It is even possible to define more than one path as source:
$ php doctrine orm:convert-mapping --from /path/to/mapping-path1 --from /path/to/mapping-path2 /path/to/mapping-path3 xml /path/to/mapping-path-converted-to-xml
$ php doctrine orm:convert-mapping xml /path/to/mapping-path-converted-to-xml
++ Reverse Engineering
You can use the same `ClassMetadataExporter` to reverse engineer a database and
generate YAML, XML, etc. from your existing databases.
You can use the `DatabaseDriver` to reverse engineer a database to an array of
`ClassMetadataInfo` instances and generate YAML, XML, etc. from them.
First you need to retrieve the metadata instances with the `DatabaseDriver`:
[php]
$sm = $em->getConnection()->getSchemaManager();
$em->getConfiguration()->setMetadataDriverImpl(
new \Doctrine\ORM\Mapping\Driver\DatabaseDriver(
$em->getConnection()->getSchemaManager()
)
);
$cme->addMappingSource($sm, 'database');
$metadatas = $cme->getMetadatasForMappingSources();
$cmf = new DisconnectedClassMetadataFactory($em);
$metadata = $cmf->getAllMetadata();
Now you can get an exporter instance and export the loaded metadata to yml:
$exporter = $cme->getExporter('yml', '/path/to/export/yml');
$exporter->setMetadatas($metadatas);
$exporter->setMetadata($metadatas);
$exporter->export();
From the command line it is very simple to do something like reverse engineer
your existing database to set of YAML mapping files.
You can also reverse engineer a database using the `orm:convert-mapping` command:
$ php doctrine orm:convert-mapping database yml /path/to/mapping-path-converted-to-yml
$ php doctrine orm:convert-mapping --from-database yml /path/to/mapping-path-converted-to-yml
> **CAUTION**
> Reverse Engineering is not always working perfectly depending on special cases.
> It will only detect Many-To-One relations (even if they are One-To-One) and
> will try to create entities from Many-To-Many tables. It also has problems
> with naming of foreign keys that have multiple column names. Any Reverse Engineered
> Database-Schema needs considerable manual work to become a useful domain model.
> Database-Schema needs considerable manual work to become a useful domain model.