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drb-xquery-1.2.0
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DRB xquery request
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | drb-xquery-1.2.0 |
| نام | drb-xquery |
| نسخه کتابخانه | 1.2.0 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | GAEL Systems |
| ایمیل نویسنده | drb-python@gael.fr |
| آدرس صفحه اصلی | - |
| آدرس اینترنتی | https://pypi.org/project/drb-xquery/ |
| مجوز | LGPLv3 |
# Xquery for DRB
This xquery module allows execute xquery on DRB nodes.
## Using this module
To include this module into your project, the `drb-xquery` module shall be
referenced into `requirement.txt` file, or the following pip line can be run:
```commandline
pip install drb-xquery
```
Example for execute a query on xml node:
```python
from drb.xquery import DrbXQuery
import drb.topics.resolver as resolver
node = resolver.create("/path_xml_file/namefile.xml")
# request node named 2A_Tile_ID with ns as namespace
query = DrbXQuery("/ns:Level-2A_Tile_ID")
result = query.execute(node)
```
Example for execute same request on two nodes
```python
from drb.xquery import DrbXQuery
import drb.topics.resolver as resolver
node_A = resolver.create("/path_xml_file/namefileA.xml")
node_B = resolver.create("/path_xml_file/namefileB.xml")
# request node named 2A_Tile_ID with ns as namespace
query = DrbXQuery("/ns:Level-2A_Tile_ID")
result = query.execute(node_A, node_B)
```
Result is always a list of value or dynamic context
Example with external variables:
```python
from drb.xquery import DrbXQuery
# create the query from String
query = DrbXQuery("declare variable $x external; "
"declare variable $y external := 5; $x+$y")
result = query.execute(None, x=9, y=12)
# result[0] == 21
```
## Command line
A command line ``xquery`` is provided by this package:
```commandline
xquery --help
Usage: drb-xquery-cmd [OPTIONS]
This command evaluates the XQuery script provided as a string or a file. The
output of the evaluation is printed out in the standard output. The output
format may have several forms according to the resulting sequence. Basically
the resulting nodes are output as XML fragments, the attributes not attached
to nodes are written as in XML but prefixed with '@' symbol and finally, the
atomic values are printed without decoration, according to the XML Schema
lexical space definitions. All items of the output sequence are comma
separated. A '()' result denotes the empty sequence.
Options:
-s, --string TEXT Command line string to be evaluated as XQuery script.
This parameter cannot be used jointly with -f. At least
-s or -f is to be set.
-f, --file TEXT Path to a file containing the sctript to be evaluated.
This parameter cannot be used jointly with -s. At least
-f or -s is to be set..
-n, --url-node TEXT Url to a node, in drb meaning, that give the context of
the query. It can be the pathof a xml file for example on
which the xquery willbe executed
-V, --verbose
-v, --variable TEXT Variable define -v <QName> <value> [ as <type>].Pushes an
external variable in the environment prior to parse and
evaluate the XQuery script. The variable is pushed in the
the environment altough it has not been declared has an
external variable, to provide it to the potential nested
XQuerys (e.g. a call to evaluate-uri() built-in
function). <QName> is the qualified name of the variable
to declare whether <value> is a string to bind as value
of the variable. If <QName> matches a typed external
variable declared in the script, <value> is converted to
that type before being bound. The trailing "as <type>" is
optional and shall follow the XQuery sequence type
declaration (e.g. as xs:integer+ )
--help Show this message and exit.
```
Example with string query
```commandline
$> xquery -s "declare variable \$x external; declare variable \$y external := 5; \$x +\$y" -v x 9 -v y 2
11
```
```commandline
$> xquery -s "/Level-2A_Tile_ID/Test_FLF[@name_attr='test_two' or serie='B'][position() < 5][2]" --url-node "./tests/files/MTD_TL.xml"
<Test_FLF xmlns="nc3" xmlns:ns1="SB" name_attr="test_one" index="03" occurence="4" atr="quattre"><name>first_doublon</name><ns1:french>premier</ns1:french><number>one</number><serie>B</serie><elt>This is 4</elt></Test_FLF>
```
Example with file query and url node
```commandline
$> xquery -f "./tests/files/test.xq" --url-node "./tests/files/MTD_TL.xml"
first_doublon
```
# Special function drb:xml()
This implementation have a function drb:xml([NODE])
This function take an item [NODE] as argument,
And return a string that represent the item argument
If the item is a DrbNode or a node, we return
the representation of this node as xml (with namespace, child, ...)
If the item is not a node but have a name and a value (like attribute)
It return <[NAME]>[Value as string]</[NAME]>
Otherwise it return the value as String.
# Limitations and differences with W3C standard
The data() function return only the value of elt
for example :
```
data(element root {element foo {"child"}, " parent" })
```
return in W3C standard:
```
child parent
```
return in this implementation:
```
parent
```
The infinity value is allowed for Decimal as for float: In W3C infinity is
only allowed for float or double.
The type xs:double is identical to xs:float
The type xs:long, xs:short, xs:byte are identical to xs:integer
Other limitations
Some types are not defined like:
xs:anyURI
xs:untypedAtomic
...
Some functions are not yet implemented like:
yearMonthDuration
deep-equal
remove
processing-instruction
exactly-one
...
Some expressions are not (yet) implemented like:
group by
order by
typeswitch
treat as
map and array are not defined too
# Warning for user using drb java implementation of Xquery
When using positional predicates, you should be aware that the to keyword does
not work as you might expect when used in predicates. If you want the first
three products, it may be tempting to use the syntax:
```
doc("catalog.xml")/catalog/product[1 to 3]
```
However, this will raise an error[*] because the predicate evaluates to
multiple numbers instead of a single one. You can, however, use the syntax:
```
doc("catalog.xml")/catalog/product[position() = (1 to 3)]
```
For compare function the result is only -1,0, 1 , in java thi function return a
negative value that can be different to -1 or a positive value that represent a
difference between the two string...
نیازمندی
| مقدار | نام |
|---|---|
| ~=2.1.3 | drb |
| ==4.9.3 | antlr4-python3-runtime |
| ~=2.8.2 | python-dateutil |
| - | Click |
زبان مورد نیاز
| مقدار | نام |
|---|---|
| >=3.8 | Python |
نحوه نصب
نصب پکیج whl drb-xquery-1.2.0:
pip install drb-xquery-1.2.0.whl
نصب پکیج tar.gz drb-xquery-1.2.0:
pip install drb-xquery-1.2.0.tar.gz