Is order saved when casting Double to Int64
Hi,
I want to save Integer, Double, TDate, TTime and Boolean values in the same column in a database.
Since the maximum size for all these is 8 bytes, I plan to use an Int64 column and cast all values
to Int64.
What I need to know is, if the order of different values is the same or if there are cases where it
will be different.
var
d1: Double;
d2: Double;
i1 : Int64 absolute d1;
i2 : Int64 absolute d2;
begin
d1 := 2.33;
i1:= d1;
d2 := 4.112;
i2 := d2;
if d1 < d2
then Assert(i1 < i2)
if d1 > d2
then Assert(i1 > i2)
cu Christian
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Christian
7/16/2015 5:49:01 AM
embarcadero.delphi.general
4258 articles. 
0 followers.
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Christian wrote: > I want to save Integer, Double, TDate, TTime and Boolean values in > the same column in a database. Since the maximum size for all these > is 8 bytes, I plan to use an Int64 column and cast all values to Int64. And I presume you have another column that specifies what data type has been stored in your "special" column? Otherwise how would you know how to interpret the value when reading it back? > What I need to know is, if the order of different values is the same > or if there are cases where it will be different. What do you mean by "order" exactly? > i1:= d1; That is redundant. Since d1 and i1 share the same memory, i1 automatically gains a value as soon as you assign a value to d1, and vice versa. > i2 := d2; Likewise. > if d1 < d2 > then Assert(i1 < i2) > > if d1 > d2 > then Assert(i1 > i2) I do not think that is a guarantee, since Int64 and Double have very different bit patterns to represent their respective values. The only thing they have in common is that they both happen to use the same bit to represent the sign. If the sign is 1, the value is negative, otherwise the value is positive. If you need to compare two values against each other, you have to make sure they are in the same representation first. -- Remy Lebeau (TeamB)
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Remy
7/17/2015 5:25:48 PM
>> What I need to know is, if the order of different values is the same >> or if there are cases where it will be different. No. The meta information is in structure in the application itself. >I do not think that is a guarantee, since Int64 and Double have very different >bit patterns to represent their respective values. The only thing they have I ended up with the solution to have three columns Double -> for Double, TDateTime Integer -> for Integer, Boolean, References String -> for Strings The overhead of 8 bytes is not a problem today compared to avoid such complicate structures and it is easier to search for a value. cu Christian
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Christian
7/17/2015 7:15:13 PM
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Remy
7/17/2015 11:37:59 PM
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