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Technical Article: Querying JPA Entities with JPQL and Native SQL


 
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Old 09-30-2008
Technical Article: Querying JPA Entities with JPQL and Native SQL

Learn how to take advantage of the Java Persistence query language and native SQL when querying over Java Persistence API entities.

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SQL::Translator::Parser(3pm)				User Contributed Perl Documentation			      SQL::Translator::Parser(3pm)

NAME
SQL::Translator::Parser - describes how to write a parser DESCRIPTION
Parser modules that get invoked by SQL::Translator need to implement a single function: parse. This function will be called by the SQL::Translator instance as $class::parse($tr, $data_as_string), where $tr is a SQL::Translator instance. Other than that, the classes are free to define any helper functions, or use any design pattern internally that make the most sense. When the parser has determined what exists, it will communicate the structure to the producer through the SQL::Translator::Schema object. This object can be retrieved from the translator (the first argument pass to parse) by calling the schema method: my $schema = $tr->schema; The Schema object has methods for adding tables, fields, indices, etc. For more information, consult the docs for SQL::Translator::Schema and its related modules. For examples of how this works, examine the source code for existing SQL::Translator::Parser::* modules. AUTHORS
Ken Youens-Clark, <kclark@cpan.org<gt>, darren chamberlain <darren@cpan.org>. SEE ALSO
perl(1), SQL::Translator, SQL::Translator::Schema. perl v5.14.2 2012-01-18 SQL::Translator::Parser(3pm)