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Reading Excel files from C#
...looked it up on MSDN. Looks like the <T> is just used to attempt to cast the contents in the column to a type. In this example and just casting the data in the columns to strings. If you wanted a double you would need to call double.Parse(x.Field<string>("Cost") or something like that...
Oracle Differences between NVL and Coalesce
...you can find a difference in the fact that NVL makes an implicit data type casting if the given values are of different types. So for instance, I was getting an error using COALESCE passing it two NULL values (one explicitly set and the other taken from a column in the database, of type NUMBER), tha...
How can I pass a member function where a free function is expected?
...n using a void* interface as they remove the potential for errors due to a cast to the wrong type.
To clarify how to use a function pointer to call a member function, here is an example:
// the function using the function pointers:
void somefunction(void (*fptr)(void*, int, int), void* context) {
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Java - Method name collision in interface implementation
...Something2 ) are expected ? I cannot even expect client code to be able to cast my instance to the appropriate interface , so am I not loosing something by this restriction ? Also note that in this way , when writing classes that actually implement the respective interfaces , we loose the benefit of...
What is the difference between string primitives and String objects in JavaScript?
...(s).prototype.toString.call = [object String].
The auto-boxing behaviour casts s back and forth to its wrapper type as needed, but the standard operations are incredibly fast since you are dealing with a simpler data type. However auto-boxing and Object.prototype.valueOf have different effects.
I...
Convert from List into IEnumerable format
...plements IEnumerable<T>. It means that you do not have to convert or cast anything.
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Most concise way to convert a Set to a List
...s when I tried to access list element it giving me error, " java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String" ..don;t know why..it's simple list.get(int) that's it ...any suggestion ?
– CoDe
Jun 20 '14 at 17:45
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Why does “,,,” == Array(4) in Javascript?
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Try using ===. When using == in Javascript, it will attempt to cast the variables, thus leading to issues like this one. The console is casting Array(4) to the string representation (i.e. Array(4).toString), which is ",,,". The reason the commas are there is that the .toString() functi...
Split value from one field to two
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how can we cast it to integer since membername is varchar.. let memberfirst be of type int. Will it work if i directly use cast() ?
– infinitywarior
Feb 12 '19 at 9:35
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Get first day of week in SQL Server
...ion is forbidden by your DBA, the following solution will work:
select *,
cast(DATEADD(day, -1*(DATEPART(WEEKDAY, YouDate)-1), YourDate) as DATE) as WeekStart
From.....
This gives the start of that week. Here I assume that Sundays are the start of weeks. If you think that Monday is the start, you...