integer

问题 I am using postgresql, and was wondering how large id INTEGER PRIMARY KEY can get compared to id SERIAL PRIMARY KEY In java an int is 4 bytes (32 bits) so it can get up to 2,147,483,647. Is this the case in postgresql? If so does that mean I cannot go past 2,147,483,647 rows? 回答1: Here is a handy chart for PostgreSQL: Name Storage Size Description Range smallint 2 bytes small-range integer -32768 to +32767 integer 4 bytes usual choice for integer -2147483648 to +2147483647 bigint 8 bytes

问题 I am just starting to learn Javascript and I immediately got confused by seemingly contradictory statements in Mozilla's A re-introduction to JavaScript (JS tutorial). One one hand: " There's no such thing as an integer in JavaScript, so you have to be a little careful with your arithmetic if you're used to math in C or Java." On the other hand (immediately after that paragraph): "In practice, integer values are treated as 32-bit ints (and are stored that way in some browser implementations),

问题 I am just starting to learn Javascript and I immediately got confused by seemingly contradictory statements in Mozilla's A re-introduction to JavaScript (JS tutorial). One one hand: " There's no such thing as an integer in JavaScript, so you have to be a little careful with your arithmetic if you're used to math in C or Java." On the other hand (immediately after that paragraph): "In practice, integer values are treated as 32-bit ints (and are stored that way in some browser implementations),

问题 I am just starting to learn Javascript and I immediately got confused by seemingly contradictory statements in Mozilla's A re-introduction to JavaScript (JS tutorial). One one hand: " There's no such thing as an integer in JavaScript, so you have to be a little careful with your arithmetic if you're used to math in C or Java." On the other hand (immediately after that paragraph): "In practice, integer values are treated as 32-bit ints (and are stored that way in some browser implementations),

问题 I am just starting to learn Javascript and I immediately got confused by seemingly contradictory statements in Mozilla's A re-introduction to JavaScript (JS tutorial). One one hand: " There's no such thing as an integer in JavaScript, so you have to be a little careful with your arithmetic if you're used to math in C or Java." On the other hand (immediately after that paragraph): "In practice, integer values are treated as 32-bit ints (and are stored that way in some browser implementations),

问题 What Integer encoding scheme is used to achieve the following, and how can we do this in .Net: 127 = 7F 128 = 8001 255 = FF01 256 = 8002 500 = F403 回答1: Not so sure it has an official name, it is a 7-bit encoding. It is a variable length encoding, the high bit of a byte is set if another byte follows. Byte order is little-endian. The .NET Framework uses it, Write7BitEncodedInt() method. Used by the BinaryWriter.WriteString() method, it saves space since most practical strings have less than

问题 Considering following basics: Any Object lives only on heap, Array IS-A Object and Integer IS-A Object I find myself difficult to answer such a simple question: Is there any difference between int[] and Integer[] inside of JVM ? Or it makes sense only at "compile-time"? 回答1: There is a difference at run-time. int[] is an array of primitive int values. Integer[] is an "object" array, holding references to Integer objects. Most important practical difference: int[] cannot hold null values. But

问题 I am aware that there are quite a few similar threads on this and I've tried the solutions but I can't seem to solve my problems despite reading them - please pardon me. Regex - Find numbers that do not contain two decimal places Regex for whole numbers only and not a blank string REGEX for whole, positive number What's the regular expression for positive whole numbers only? (zero is not allowed) Regex that accepts only numbers (0-9) and NO characters Regex to match only numbers in currency

问题 I know this error has been covered here but I have been searching through the answers for days now and when I think I have cracked it I end up breaking the code somewhere else. I am trying to run AppleScript in Xcode to make a backup of a folder on a set network machine. The problem I am having is that the backup is date stamped and in a sub folder on the users Desktop. I am trying to avoid using hard POSIX paths to make the final app universal. All the solutions I have found don't take this

问题 Well I can find many big integer libraries but they are for all programming languages except VB.NET. Does anyone know a class/library for Visual Basic .NET which can handle very big numbers? (I'd like to handle 1024 or even more bits). The only calculation support I need it addition, substitution, multiplication, division and rounding. It's ment to be used with this code: Dim Letterz() As Integer = {33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56