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Displaying posts with tag: udf (reset)

Advanced JSON for MySQL
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What is JSON

JSON is an text based, human readable format for transmitting data between systems, for serializing objects and for storing document store data for documents that have different attributes/schema for each document. Popular document store databases use JSON (and the related BSON) for storing and transmitting data.

Problems with JSON in MySQL

It is difficult to inter-operate between MySQL and MongoDB (or other document databases) because JSON has traditionally been very difficult to work with. Up until recently, JSON …

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Advanced JSON for MySQL: indexing and aggregation for highly complex JSON documents
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What is JSON
JSON is an text based, human readable format for transmitting data between systems, for serializing objects and for storing document store data for documents that have different attributes/schema for each document. Popular document store databases use JSON (and the related BSON) for storing and transmitting data.

Problems with JSON in MySQL
It is difficult to inter-operate between MySQL and MongoDB (or other document databases) because JSON has traditionally been very difficult to work with. Up until recently, JSON is just a TEXT document. I said up until recently, so what has …



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Access Shard-Query with the MySQL client without using MySQL proxy
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One of the great features of Shard-Query is the ability to use MySQL proxy to access resultsets transparently. While this is a great tool, many people have expressed reservations about using MySQL Proxy, an alpha component in their production environment.

I recognize that this is a valid concern, and have implemented an alternate method of retrieving resultsets directly in the MySQL client, without using a proxy. This means that any node can easily act as the “head” node without any extra daemon, instead of having to run many proxies.

The sq_helper() routine has been checked into the git …

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‘Indexing’ JSON documents for efficient MySQL queries over JSON data
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MySQL meets NoSQL with JSON UDF

I recently got back from FOSDEM, in Brussels, Belgium. While I was there I got to see a great talk by Sveta Smirnova, about her MySQL 5.7 Labs release JSON UDF functions. It is important to note that while the UDF come in a 5.7 release it is absolutely possible to compile and use the UDF with earlier versions of MySQL because the UDF interface has not changed for a long time. However, the UDF should still be considered alpha/preview level of quality and should not be used in production yet! For this example I am using Percona …

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JSON UDF functions 0.3.3 have been released
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New version of JSON UDF functions has been just released. This is maintenance release which only contains fix for 4 bugs:

74090/19821398 `INSTALL_JSONUDFS` ISSUES A WARNING DUE TO TRUNCATION OF `VERSION_COMPILE_OS`
74091/19692634 `JSON_DEEP_MERGE`: DEEP CRASH IN `MERGE_TREE`
74092/19692628 CRASH WITH SECOND-HAND NULL IN PARAMETERS
74097/19693198 …


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Using UDFs for geo-distance search in MySQL
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In my previous post about geo-spatial search in MySQL I described (along with other things) how to use geo-distance functions. In this post I will describe the geo-spatial distance functions in more details.

If you need to calculate an exact distance between 2 points on Earth in MySQL (very common for geo-enabled applications) you have at least 3 choices.

  • Use stored function and implement  …
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MySQL and PostgreSQL JSON functions: do they differ much?
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As author of MySQL JSON functions I am also interested in how development goes in another parties. JSON functions and operators in PostgreSQL, indeed, have great features. Some of them, such as operators, I can not do using UDF functions only. But lets see how these functions are interchangeable.

Note: all PostgreSQL examples were taken from PostgreSQL documentation.
First topic is syntax sugar.




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How to install MySQL 10.0.6-MariaDB and to compile lib_mysqludf_preg on CentOS 6.4
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In short, during an optimization or a MySQL query involving a lot of replace(replace(replace…))) I decided to compile PREG as lib_mysqludf_preg from UDF Repository for MySQL in a view to use PCRE functions directly in MySQL.

Too bad MySQL still cant not use functions for index creation, but this is not the theme of this post.

So, fist install MariaDB 10.0.6:
set the MariaDB 10.0.6 repo, I used the ftp mirror at ftp.ulak.net.tr


root@seik-centos-01:[Wed Dec 18 23:55:12][/tmp]$ cat …

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JSON UDFs: is it hard to type keys?
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Currently, if you want to search a key using JSON UDFs you have to specify each its part as a separate argument to the function: JSON_CONTAINS_KEY(doc, 'root', 'child', 'child of child', 'child of child of child', etc.....). This way of working with parameters is easy for developer, less error-prone, but can be not very beautiful.

I was suggested by some of users to change it to '/parent/child/child-of-child/...' or to 'parent:child:child-of-child:...' There are, probably, can be other suggestions. What do you like the best? How do you feel about current style with separate argument for each key element? Should we change or extend this syntax?

New cmake options for JSON UDFs.
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Two weeks ago I announced new maintenance release of JSON UDFs: 0.2.1. It not only contains bug fixes, how you can expect from a maintenance release, but also contains improvements in build and test scripts.

First improvement is the easier way to build JSON UDFs on Windows. In the first version building on Windows was a pane: you had to build PCRE library, copy four files to directories where Visual Studio can find them and only then build JSON functions themselves. Now you can build this way too, but only if you really wish.

By default cmake will create appropriate makefiles for bundled PCRE sources and for JSON functions. …



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Showing entries 1 to 10 of 43 10 Older Entries

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