structure | 易学教程

User uploads folder structure

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问题 Can the folder structure for user uploads have any impact on performance as the site grows? For instance, I considered this structure for storing photos/albums: Public folder └── Uploads └── Users └── User ID └── Album ID - contains all photos in the album Thanks in advance! 回答1: Can the folder structure for user uploads have any impact on performance as the site grows? Yes it can. If you store too many files in single directory it may slow down operations. Posted structure is very good. Edit

Python structure always stuck at 0 no matter what value you assign to it?

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I was writing a module to compact bits to be passed to C program, but keep getting errors. After some tests, I found out that the field a of class Blah is stuck at 0 no matter what. Does anyone know if this is a bug or if I'm doing something wrong here? Sorry, I forgot to mention I'm using python 3.1.2 from http://www.python.org/download/releases/3.1.2/ >>> import ctypes >>> class Blah(ctypes.Structure): ... _fields_ = [("a", ctypes.c_uint64, 64), ... ("b", ctypes.c_uint16, 16), ... ("c", ctypes.c_uint8, 8), ... ("d", ctypes.c_uint8, 8)] ... >>> x = Blah(0xDEAD,0xBEEF,0x44,0x12) >>> print (hex

Maven: POM modules and submodules hierarchy

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My project is structured like this: . |--module | `-- pom.xml | --submodule | `-- pom.xml `-- pom.xml The POM's (simplified): Project: <project> <modelVersion>4.0.0</modelVersion> <artifactId>project</artifactId> <name>Project</name> <groupId>org.myorg</groupId> <version>1.0.6-SNAPSHOT</version> <packaging>pom</packaging> <modules> <module>module</module> </modules> (...) </project> Module: <project> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.myorg</groupId> <artifactId>project</artifactId> <version>1.0.6-SNAPSHOT</version> <relativePath>../pom.xml</relativePath> </parent>

VB.NET Iterating through objects of a structure

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I have a structure "xyz" with 3 string objects in it. "foo" "bar" and "abc" I want to iterate through the structure and compare the names of the objects. Structure xyz dim foo as string dim bar as string dim abc as string End Structure Pseudo: For each x as object in xyz if x.Name = "foo" then 'bang end if End each Is this possible? If this is just a one time thing you're probably going to have an easier time using a Dictionary instead, but you could do this with Reflection if you prefer to keep the structure. This little code snippet will list out each structure member for you in a

Managing Multi-Project Branches in Git

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Are there tools to achieve the following abstract operations in a Maven project/SCM scenario? Given an application project, create branches for the application and all the snapshot libraries that it uses, transitively; these branches should be manageable as one logical branch (see next) Given the logical branch of an application project, release it (by running Maven release); this means releasing multiple branches, one per library Background (original): As you know, Git recommends using the repository-per-project structuring paradigm. At the same time, any serious project, in our case Maven

Defining a Structure in C with Malloc

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问题 I asked a question earlier on defining a structure using malloc. This was the answer I was given by the majority: struct retValue* st = malloc(sizeof(*st)); I was showing a friend my code, and we came to a stumbling block. Could someone please explain why this code works? From my viewpoint, *st hasn't been defined when you malloc it, so there could be any kind of garbage in there. It should be malloc(sizeof(struct retValue)) Thanks for any help 回答1: Sizeof looks at the type of the expression

What mysql engine for huge amount of data (logging)?

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What mysql engine would be best suited for handling huge amount (many rows) of (small) data? I talking about logging. I'm thinking about logging whenever I do things on my page, like calling a function, calling a file and so on. A tip of how I should structure the table is also appreciated. The Archive storage engine is geared toward storing logs, and is compressed. It supports INSERT and SELECT only, no UPDATE or DELETE. I have never used it, but it may fit your needs. 来源： https://stackoverflow.com/questions/3449506/what-mysql-engine-for-huge-amount-of-data-logging

C - Change all values of an array of structures in one line

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I can declare a structure: typedef struct { int var1; int var2; int var3; } test_t; Then create an array of those structs structure with default values: test_t theTest[2] = { {1,2,3}, {4,5,6} }; But after I've created the array, is there any way to change the values in the same way I did above, using only one line, specifying every value explicitly without a loop? In C99 you can assign each structure in a single line. I don't think that you can assign the array of structs in one line though. C99 introduces compound literals. See the Dr. Dobbs article here: The New C: Compound Literals theTest

protocol buffers: how to serialize and deserialize multiple messages into a file (c++)?

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I am new to Protocol Buffers and c++ but my task requires me to use the two. I want to write a structure of data ( message) into a single file multiple times and be able to read the data. i can read and write a single message but multiple messages is proving harder. I have looked for answers for hours but i can't seem to be able to read the data as a structure. Any example code or pointers will be very helpful. This is the format of my structure: typedef struct Entry { char name[ NAME_MAX]; int id; int age; char DoB[32]; } entry; This is what i've been using to write into a file: Person_File

how to print structure value(like gdb ptype) automatically in C?

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This question stay in my head for a long time. As we know, we can easily print data structure in GDB when we debugging, like gdb ptype command, it can output all field value of structure. I know GDB use bfd library to read symbolic information in object file. My question is: if I want to do this in my C source code, how to do? because I don't want to printf each field of structure one by one. Is there have any exist library to solve this issue? I think that library will not only meets my requirement, it will be very useful for many others programmers when writing C/C++ code. As far as C is