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XPath: How to select nodes which have no attributes?
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To address Marek Czaplicki's comment and expand the answer
//node[not(@*) or not(string-length(@*))]
....will select all node elements with zero attributes OR which have attributes that are all empty. If it was just a particular attribute you are interested i...
Visual Studio Immediate window: how to see more than the first 100 items
... this is way late. However, If you add your object to the watch window. Expand the properties, where all are displayed. Then Ctrl-A and Copy. You can then paste in excel to get an organized list of properties and their values.
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CHECK constraint in MySQL is not working
...e just ignored.
There is a simple alternative
You can create BEFORE INSERT and BEFORE UPDATE triggers which either cause an error or set the field to its default value when the requirements of the data are not met.
Example for BEFORE INSERT working after MySQL 5.5
DELIMITER $$
CREATE TRIGGER `test_b...
Ruby: Merging variables in to a string
...implified the problem too much. The String will be pulled from a database, and the variable dependant a number of factors. Normally I would use a replace for 1 or two varibles, but this has the potential to be more. Any thoughts?
– FearMediocrity
Feb 16 '09 ...
LoaderManager with multiple loaders: how to get the right cursorloader
... mix apples with oranges.
In your case it seems that both the data source and the result treatment are different, which requires you to write the extra boilerplate code to identify the current scenario and dispatch it to the appropriate code block.
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Execution of Python code with -m option or not
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When you use the -m command-line flag, Python will import a module or package for you, then run it as a script. When you don't use the -m flag, the file you named is run as just a script.
The distinction is important when you try to run a package. T...
How to clear the cache in NetBeans
I created a project in NetBeans, and I would like to clear the NetBeans cache.
13 Answers
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A field initializer cannot reference the nonstatic field, method, or property
I have a class and when I try to use it in another class I receive the error below.
4 Answers
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mongodb group values by multiple fields
...takes an "pipeline" expression as an argument instead of the "localFields" and "foreignFields" options. This then allows a "self-join" with another pipeline expression, in which we can apply $limit in order to return the "top-n" results.
db.books.aggregate([
{ "$group": {
"_id": "$addr",
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How do I delete a fixed number of rows with sorting in PostgreSQL?
...'t change ctids, I don't think. Since that just compacts within each page, and the ctid is just the line number not a page offset. A VACUUM FULL or a CLUSTER operation would change the ctid, but those operations take an access exclusive lock on the table first.
– araqnid
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