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How to use NULL or empty string in SQL
I would like to know how to use NULL and an empty string at the same time in a WHERE clause in SQL Server. I need to find records that have either null values or an empty string. Thanks.
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Keep only first n characters in a string?
Is there a way in JavaScript to remove the end of a string?
7 Answers
7
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What's Mongoose error Cast to ObjectId failed for value XXX at path “_id”?
...ast fails.
This doesn't happen with 41224d776a326fb40f000001 because that string is a valid ObjectId.
One way to resolve this is to add a check prior to your findById call to see if id is a valid ObjectId or not like so:
if (id.match(/^[0-9a-fA-F]{24}$/)) {
// Yes, it's a valid ObjectId, procee...
Escaping regex string
...se the re.escape() function for this:
4.2.3 re Module Contents
escape(string)
Return string with all non-alphanumerics backslashed; this is useful if you want to match an arbitrary literal string that may have regular expression metacharacters in it.
A simplistic example, search any occu...
How to extract the substring between two markers?
Let's say I have a string 'gfgfdAAA1234ZZZuijjk' and I want to extract just the '1234' part.
18 Answers
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Default constructor vs. inline field initialization
...and more straight :
public class Foo {
private int x = 5;
private String[] y = new String[10];
}
than the constructor way :
public class Foo{
private int x;
private String[] y;
public Foo(){
x = 5;
y = new String[10];
}
}
In real classes with so real sp...
How to get a enum value from string in C#?
...hoice;
// `value` is what you're looking for
} else { /* error: the string was not an enum member */ }
Before .NET 4.5, you had to do the following, which is more error-prone and throws an exception when an invalid string is passed:
(uint)Enum.Parse(typeof(baseKey), "HKEY_LOCAL_MACHINE")
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How could I convert data from string to long in c#
How could i convert data from string to long in C#?
9 Answers
9
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How do I set the selected item in a comboBox to match my string using C#?
I have a string "test1" and my comboBox contains test1 , test2 , and test3 . How do I set the selected item to "test1"? That is, how do I match my string to one of the comboBox items?
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Remove empty array elements
Some elements in my array are empty strings based on what the user has submitted. I need to remove those elements. I have this:
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