{"id":1543,"date":"2011-03-22T21:04:21","date_gmt":"2011-03-22T20:04:21","guid":{"rendered":"http:\/\/www.gamlor.info\/wordpress\/?p=1543"},"modified":"2021-10-16T01:29:40","modified_gmt":"2021-10-16T00:29:40","slug":"making-of-db4o-linqpad-driver-linqpad-drivers","status":"publish","type":"post","link":"https:\/\/www.gamlor.info\/wordpress\/2011\/03\/making-of-db4o-linqpad-driver-linqpad-drivers\/","title":{"rendered":"Making of the db4o LINQPad Driver: LINQPad Drivers"},"content":{"rendered":"
\"LINQPad<\/a>

LINQPad drivers<\/p><\/div>\n

In this little post series I\u2019m going to show how my db4o LINQPad driver<\/a> is implemented. Some parts of these posts useful for other drivers, other parts will be db4o specific.<\/p>\n

Side note: There\u2019s already a new version of the LINQPad driver<\/a> out which fixes some issues.<\/p>\n

Overview<\/h2>\n

The LINQPad website<\/a> explains well how LINQPad works. For each query LINQPad starts an app domain<\/a>. This ensures that LINQPad can cleanly kill a query or any code running. For each query LINQPad generates the CIL code dynamically and then runs it.<\/p>\n

As I explained in a earlier post<\/a> you can provide additional assemblies to the query execution context. These assemblies are also included in these app domains. That allows you run use any library in LINQPad.<\/p>\n

Drivers<\/h2>\n

LINQPad supports different drivers for different data source. A driver is responsible for creating connections, showing the available entities or tables and executing queries. You can find the official documentation here<\/a>. Also two example drivers are available there.<\/p>\n

There are two kinds of drivers, static and dynamic drivers. In static drivers you statically provide a query-context. This means you have to provide an assembly with the code for the entities etc. In a dynamic driver the driver generates the data-context dynamically, including the classes to represent entities.<\/p>\n

Packaging a Driver<\/h2>\n

LINQPad drivers have to be packaged in a certain way to work. Basically a driver is a zip-file with all required assemblies and a description-file. The description-file is called header.xml and contains the name of the driver assembly. The driver-assembly has to be strongly named<\/a>, otherwise LINQPad won\u2019t accept it. Finally the file-extension for the driver zip file is lpx.<\/p>\n

Driver Code<\/h2>\n

The entry point into the driver is a class which inherits either from the DynamicDataContextDriver or the StaticDataContextDriver class. In that class you need to implement a few things. Like the dialog for creating a new connection, name-properties etc. In the case of a dynamic driver you also have to implement a method to generate to required assemblies at runtime. After that you can ship your driver.<\/p>\n

Conclusion<\/h2>\n

LINQPad supports plugins for all kinds of datasources. You are free to implement your own driver. This site contains<\/a> the official documentation and example projects.<\/p>\n","protected":false},"excerpt":{"rendered":"

In this little post series I\u2019m going to show how my db4o LINQPad driver is implemented. Some parts of these posts useful for other drivers, other parts will be db4o… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[126],"tags":[21,214],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/posts\/1543"}],"collection":[{"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/comments?post=1543"}],"version-history":[{"count":11,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/posts\/1543\/revisions"}],"predecessor-version":[{"id":3910,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/posts\/1543\/revisions\/3910"}],"wp:attachment":[{"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/media?parent=1543"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/categories?post=1543"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gamlor.info\/wordpress\/wp-json\/wp\/v2\/tags?post=1543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}