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Change type of varchar field to integer: “cannot be cast automatically to type integer”
...YPE integer USING (trim(col_name)::integer);
to strip white space before converting.
This shoud've been obvious from an error message if the command was run in psql, but it's possible PgAdmin-III isn't showing you the full error. Here's what happens if I test it in psql on PostgreSQL 9.2:
=> ...
How do I initialize an empty array in C#?
...
string[] a = { };
[The elements inside the bracket should be implicitly convertible to type defined, for instance, string[] a = { "a", "b" };]
Or yet another:
var a = Enumerable.Empty<string>().ToArray();
Here is a more declarative way:
public static class Array<T>
{
public s...
int to hex string
I need to convert an int to hex string.
4 Answers
4
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Convert timedelta to total seconds
... 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix...
How do I provide custom cast support for my class?
... implicit operator byte[] (MyType x)
{
byte[] ba = // put code here to convert x into a byte[]
return ba;
}
or
public static explicit operator MyType(byte[] x)
{
if (!CanConvert)
throw new DataValueNullException();
// Factory to convert byte[] x into MyType
MyType mt ...
How do I use LINQ Contains(string[]) instead of Contains(string)
...le<T>, which has a Contains method. Therefore, it's not necessary to convert the array to an IList<T>. msdn.microsoft.com/en-us/library/19e6zeyy.aspx
– spoulson
Oct 13 '08 at 1:11
...
Jquery Ajax Posting json to webservice
...uses (JavaScriptSerializer) is pretty flexible, and will do what it can to convert your input data into the server-side type you specify.
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Finding the number of days between two dates
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Convert your dates to unix timestamps, then substract one from the another. That will give you the difference in seconds, which you divide by 86400 (amount of seconds in a day) to give you an approximate amount of days in tha...
Signed versus Unsigned Integers
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Another difference is when you are converting between integers of different sizes.
For example, if you are extracting an integer from a byte stream (say 16 bits for simplicity), with unsigned values, you could do:
i = ((int) b[j]) << 8 | b[j+1]
(shou...
What is the use of the %n format specifier in C?
...tput so far by this call to one of the fprintf() functions. No argument is converted.
An example usage would be:
int n_chars = 0;
printf("Hello, World%n", &n_chars);
n_chars would then have a value of 12.
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