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Topic: datamatrix · GitHub
ZXing ("Zebra Crossing") barcode scanning library for Java, Android ... DataMatrix 2D barcode generator ... Datamatrix implemented in ABAP, proof of concept.

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15 Feb 2008 ... Matrix codes, on the other hand, tend to use square or circular dots instead of ... In 2004, PDF417's creator Symbol Technologies issued a press release ... the trendiest formats today are without a doubt Data Matrix (DM) and Quick ... Barcode4J is an open source Java app that generates both 1-D and 2-D ...

We already mentioned in 4 how fetching a list of books and then referencing their authors can lead to 2n+1 queries, but it s worth a reminder. Use the :include parameter in finders if you know you are going to use the associated objects, like authors, on the page: def index @book_pages, @books = paginate :books, :per_page => 10, :include => [:authors, :publisher], :order => "books.id desc" end Another common database performance problem arises when you forget to add needed indices to the database. This is not a Rails-specific problem per se, but it is easy to forget when building an application with small sample data. When the amount of data then grows, you might start wondering why queries that were so snappy when testing are now taking a minute or an hour (no kidding!). If you track the root of a slow action to a certain database query (or find one by following the slow query log with MySQL, as described in 10), the next step is to analyze that query. Most database vendors have their own tools for that. In MySQL and PostgreSQL, you can use EXPLAIN [SELECT query] for this. As an example, let s run EXPLAIN on a query that is run whenever the index page of the catalog controller is loaded (we ve truncated the output lines to make them more readable): mysql> -> -> -> -> -> -> EXPLAIN SELECT COUNT(DISTINCT books.id) FROM books LEFT OUTER JOIN authors_books ON authors_books.book_id = books.id LEFT OUTER JOIN authors ON authors.id = authors_books.author_id LEFT OUTER JOIN publishers ON publishers.id = books.publisher_id;

Note You may see a single Get External button instead of several buttons. Click the Get External Data button, and then click From Text.

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zxing/zxing: ZXing ("Zebra Crossing") barcode scanning ... - GitHub
ZXing ("Zebra Crossing") barcode scanning library for Java , Android. java android .... UPC-E, Code 93, Data Matrix . EAN- ... in Java . ZBar, Reader library in C99.

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zxing/zxing: ZXing ("Zebra Crossing") barcode scanning ... - GitHub
ZXing ("Zebra Crossing") barcode scanning library for Java, Android. java android barcode .... UPC-A, Code 39, QR Code. UPC-E, Code 93, Data Matrix. EAN- ...

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