DDevelopment & Design

Sorting strings in Oracle by national rules

  • byModulo
  • February 18, 2011
  • 1 minute read

Sometimes we need to sort a list by rules of a national letter order, e.g. in Polish the national charactes are mostly place between original the Latin ones: … b, c, ć, d, e, ę, f … In other languages, it can be even more sophisticated, like in Spanish, where ll is located after lz, so a single character replacement wouldn’t work.

If we sort the following way:

SELECT * FROM TABLE (SYS.ODCIVARCHAR2LIST(‘cde’, ‘ća’, ‘dx’, ‘ca’)) ORDER BY COLUMN_VALUE;

We’ll get: ca, cde, dx, ća and that’s wrong. To sort the list correctly, we can specify a language rule: NLSSORT(COLUMN_VALUE,’NLS_LANG=pl’):

SELECT * FROM TABLE (SYS.ODCIVARCHAR2LIST(‘cde’, ‘ća’, ‘dx’, ‘ca’)) RDER BY NLSSORT(COLUMN_VALUE,’NLS_LANG=pl’);

Finally we’ll get the correct result: ca, cde, ća, dx.

— Previous article

GWT / GXT compilation slow and freezes my Windows ?

Next article —

After WarJUG

You May Also Like
DDevelopment & Design

Open IMS Core Mr interface

Open IMS Core does’t have standard way to define connection to MRF (Media Resource Function) on Mr interface.In IMS Mr interface is based on SIP and is similar to ISC used by Application Server (AS). Because of that we can define MRF as IMS AS and just add Wildcard PSI that has trigger on that AS. That [...]
DDevelopment & Design

Need to make a quick json fixes – JSONPath for rescue

From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.

First of all you can try it without pain online: http://jsonpath.curiousconcept.com/. Full syntax is described at http://goessner.net/articles/JsonPath/



But also you can download python binding and run it from command line:
$ sudo apt-get install python-jsonpath-rw
$ sudo apt-get install python-setuptools
$ sudo easy_install -U jsonpath

After that you can use inside python or with simple cli wrapper:
#!/usr/bin/python
import sys, json, jsonpath

path = sys.argv[1]

result = jsonpath.jsonpath(json.load(sys.stdin), path)
print json.dumps(result, indent=2)

… you can use it in your shell e.g. for json:
{
"store": {
"book": [
      {
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
      },
      {
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
      },
      {
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
      },
      {
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
      }
    ],
"bicycle": {
"color": "red",
"price": 19.95
    }
  }
}

You can print only book nodes with price lower than 10 by:
$ jsonpath '$..book[?(@.price

Result:
[
  {
"category": "reference",
"price": 8.95,
"title": "Sayings of the Century",
"author": "Nigel Rees"
  },
  {
"category": "fiction",
"price": 8.99,
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"author": "Herman Melville"
  }
]

Have a nice JSON hacking!From time to time I have a need to do some fixes in my json data. In a world of flat files I do this with grep/sed/awk tool chain. How to handle it for JSON? Searching for a solution I came across the JSONPath. It quite mature tool (from 2007) but I haven't hear about it so I decided to share my experience with others.