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Update MongoDB field using value of another field
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The way we do this is by $projecting our documents and use the $concat string aggregation operator to return the concatenated string.
we From there, you then iterate the cursor and use the $set update operator to add the new field to your documents using bulk operations for maximum efficiency.
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Get ID of last inserted document in a mongoDB w/ Java driver
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In MongoTemplate.class has a method
protected <T> void doInsert(String collectionName, T objectToSave, MongoWriter<T> writer) {
assertUpdateableIdIfNotSet(objectToSave);
initializeVersionProperty(objectToSave);
maybeEmitEvent(new BeforeConvertEvent<T>(objectToSa...
Does Java read integers in little endian or big endian?
...on formats that use some form of Huffman encoding (i.e. all of them). For extra fun, JPEG is "bitwise big-endian" (i.e. the most significant bit is the "first" bit) and LZ is "bitwise little-endian". I once worked on a proprietary compression format that used both formats under the hood. Oh, that...
How to parse a JSON string into JsonNode in Jackson?
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A slight variation on Richards answer but readTree can take a string so you can simplify it to:
ObjectMapper mapper = new ObjectMapper();
JsonNode actualObj = mapper.readTree("{\"k1\":\"v1\"}");
share
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Check if a string has white space
I'm trying to check if a string has white space . I found this function but it doesn't seem to be working:
7 Answers
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PHP multidimensional array search by value
...compared types have to be exactly same, in this example you have to search string or just use == instead ===.
Based on angoru answer. In later versions of PHP (>= 5.5.0) you can use one-liner.
$key = array_search('100', array_column($userdb, 'uid'));
Here is documentation: http://php.net/manu...
“Conversion to Dalvik format failed with error 1” on external JAR
...ject properties which caused both android.jar's to conflict. Removing the extra in the Java Build Path did the trick
– styler1972
Aug 4 '11 at 18:50
2
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How do I convert a string to enum in TypeScript?
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Enums in TypeScript 0.9 are string+number based. You should not need type assertion for simple conversions:
enum Color{
Red, Green
}
// To String
var green: string = Color[Color.Green];
// To Enum / number
var color : Color = Color[green];
Tr...
Convert JSON String to Pretty Print JSON output using Jackson
This is the JSON string I have:
9 Answers
9
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Error “gnu/stubs-32.h: No such file or directory” while compiling Nachos source code
...led libc6-dev-i386 - do sudo apt-get install libc6-dev-i386. See below for extra instructions for Ubuntu 12.04.
On Red Hat distros, the package name is glibc-devel.i686 (Thanks to David Gardner's comment).
On CentOS 5.8, the package name is glibc-devel.i386 (Thanks to JimKleck's comment).
On Cen...