大约有 13,906 项符合查询结果（耗时：0.0428秒） [XML]
How can I rename a field for all documents in MongoDB?
...the docs which contain the property:
db.foo.update({"name.additional": {$exists: true}}, {$rename:{"name.additional":"name.last"}}, false, true);
The false, true in the method above are: { upsert:false, multi:true }. You need the multi:true to update all your records.
Or you can use the former w...
SELECT * FROM X WHERE id IN (…) with Dapper ORM
...n the list of values for the IN clause is coming from business logic? For example let's say I have a query:
9 Answers
...
How to find the operating system version using JavaScript?
...meTypes = [object MimeTypeArray]
# oscpu = Windows NT 5.1
# vendor = Firefox
# vendorSub = 1.0.7
# product = Gecko
# productSub = 20050915
# plugins = [object PluginArray]
# securityPolicy =
# userAgent = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7
# cooki...
Integrating the ZXing library directly into my Android application
...nstall Apache Ant - (See this YouTube video for config help)
Download the ZXing source from ZXing homepage and extract it
With the use of Windows Commandline (Run->CMD) navigate to the root directory of the downloaded zxing src.
In the commandline window - Type ant -f core/build.xml press enter a...
Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...-elif-elif-else statement in which 99% of the time, the else statement is executed:
5 Answers
...
Matplotlib make tick labels font size smaller
...atplotlib figure, how can I make the font size for the tick labels using ax1.set_xticklabels() smaller?
10 Answers
...
LINQ with groupby and count
... series of groups IEnumerable<Grouping>, where each Grouping itself exposes the Key used to create the group and also is an IEnumerable<T> of whatever items are in your original data set. You just have to call Count() on that Grouping to get the subtotal.
foreach(var line in data.GroupBy...
Why is there a difference in checking null against a value in VB.NET and C#?
...also a more standard (than C#'s) interpretation of three-valued logic, as explained here.
The C# team made different assumptions about what NULL means, resulting in the behaviour difference you show. Eric Lippert wrote a blog about the meaning of NULL in C#. Per Eric Lippert: "I also wrote about th...
Windows batch: call more than one command in a FOR loop?
...ile to call more than one command in a single FOR loop? Let's say for example I want to print the file name and after delete it:
...
Output data from all columns in a dataframe in pandas [duplicate]
...:
print paramdata.values
converts the dataframe to its numpy-array matrix representation.
paramdata.columns
stores the respective column names and
paramdata.index
stores the respective index (row names).
share
...