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PostgreSQL: How to pass parameters from command line?
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You can use the -v construct e.g
psql -v v1=12 -v v2="'Hello World'" -v v3="'2010-11-12'"
and then refer to the variables in sql as :v1, :v2 etc
select * from table_1 where id = :v1;
Please pay attention on how we pass string/date value using two quotes " '...' "
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Java: possible to line break in a properties file?
...oss multiple lines, and whitespace that starts a line is ignored:
myStr = Hello \
World
The Java docs put it this way:
A logical line holds all the data of a key-element pair, which may be spread out across several adjacent natural lines by escaping the line terminator sequence with a...
What exactly is Type Coercion in Javascript?
...ram? There’s nothing preventing the programmer from typing {} + {} or “hello” + 5 in a program even if the language doesn’t think those expressions make any sense.
What ultimately happens in those situations depends on how strict the language is about its type rules.
A languages type syst...
Can I convert a C# string value to an escaped string literal
... return writer.ToString();
}
}
}
This code:
var input = "\tHello\r\n\tWorld!";
Console.WriteLine(input);
Console.WriteLine(ToLiteral(input));
Produces:
Hello
World!
"\tHello\r\n\tWorld!"
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Adding multiple class using ng-class
...:
<div ng-class="{class1 : expression1, class2 : expression2}">
Hello World!
</div>
To apply multiple classes when an expression holds true:
<!-- notice expression1 used twice -->
<div ng-class="{class1 : expression1, class2 : expression1}">
Hello World!
</div&...
Update MongoDB field using value of another field
...g the update/creation of a field based on another field:
// { firstName: "Hello", lastName: "World" }
db.collection.update(
{},
[{ $set: { name: { $concat: [ "$firstName", " ", "$lastName" ] } } }],
{ multi: true }
)
// { "firstName" : "Hello", "lastName" : "World", "name" : "Hello World" }
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Convert all first letter to upper case, rest lower for each word
...first letter of the entire string. Therefore, this solution would convert "hello world" to "Hello world", rather than "Hello World".
– brsfan
Feb 28 '17 at 18:11
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Remove a fixed prefix/suffix from a string in Bash
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$ string="hello-world"
$ prefix="hell"
$ suffix="ld"
$ #remove "hell" from "hello-world" if "hell" is found at the beginning.
$ prefix_removed_string=${string/#$prefix}
$ #remove "ld" from "o-world" if "ld" is found at the end.
$ suf...
Case insensitive regex in JavaScript
...laceWith) {
return str.replace(regex, replaceWith);
}
replaceWithRegex('HEllo there', /[aeiou]/gi, 'X'); //"HXllX thXrX"
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How do I syntax check a Bash script without running it?
...r bash script tries to execute a command that isn't in your path, like ech hello instead of echo hello.
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