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OrderId field of the database is set to null when OrderItem is saved, then Update the Order Id to OrderItem. [Note: this is the final result, not the intermediate result. During the Insert OrderItem operation, its OrderId is the Id of the Order object corresponding to the object. If the Order object is not saved, then, OrderId is null. If it is saved, it is the Id of the Order, and then the OrderId will be updated.] Next, let's take a specific example: department and employee, one-to-multiple

In the previous article, we used the description of the SIP Routing Mechanism to understand the definition and concept of the SIP routing mechanism. Next, let's explain these abstract concepts to help you understand them. Next, we will use two SIP routing instances to help you understand these concepts. SIP route Example 1: Scenario: There are two proxies between two UE, U1-> P1-> P2-> U2, and both proxies are willing to add Record-Route header fields

used, the meaning is: each point to save a 8bit brightness value (that is, Y value), each 2x2 point to save a Cr and CB value, the image in the naked eye does not feel much change. Therefore, the original use of RGB (R,g,b are 8bit unsigned) model, 4 points need to 8x3=24 bites (such as the first figure). Now only 8+ (8/4) + (8/4) =12bites is required, averaging 12bites per point, which compresses half the image's data.The above only gives a theoretical example, in the actual data storage is li

specified later is called before the function exits. Func ReadWrite () bool { file. Open ("file") defer file. Close () if Failurex { return false } if Failurey { return false } return True} If there are many calls, then the last-in- defer defer first-out mode is used, so the following code will output4 3 2 1 0 For I: = 0; I The first impression that defer gave me was that, like in Java, try { }finally { } My current understanding is that in the function bloc

value), each 2x2 point to save a Cr and CB value, the image in the naked eye does not feel much change. Therefore, the original use of RGB (R,g,b are 8bit unsigned) model, 4 points need to 8x3=24 bites (such as the first figure). Now only 8+ (8/4) + (8/4) =12bites is required, averaging 12bites per point, which compresses half the image's data.The above only gives a theoretical example, in the actual data storage is likely to be different, the following gives several specific storage forms:(1)

class file Structure The class file is a 8-bit byte stream. All 16, 32, and 64 bits of data are stored in Big-endian form with a continuous number of 8 bits. Data type in class file U1, U2, U4 represent unsigned 1, 2, 4 byte data. The 0......* type data will be represented as table. Classfile structure U4 Magic; U2 minor_version;

The main sampling formats are YCbCr, and YCbCr. YCbCr is commonly used. It means that each vertex stores an 8-bit brightness value (that is, the Y value), and each 2x2 points stores a Cr and CB value, the image does not feel much changed to the naked eye. Therefore, the original RGB (R, G, and B are all 8bit unsigned) models, 4 points require 8x3 = 24 bites (such as the first figure ). now, we only need 8 + (8/4) + (8/4) = 12 bites, and each point occupies 12 bites on average (such as the second

number of dynamic languages can also be directly on the Java Virtual machine to run, The principle is that these dynamic language compilers compile source files into the same bytecode files as Java, so that Java virtual machines can execute these dynamic languages as they do in the Java language. The byte code class class file is composed of a series of byte code commands that represent the semantics of various constants, variables, keywords, and operational symbols in the program, and so on. J

, and YCbCr 4:4:4. Which YCbCr 4:1:1 more commonly used, the meaning is: each point to save a 8bit brightness value (that is, Y value), each 2x2 point to save a Cr and CB value, the image in the naked eye of the feeling will not be too big changes. Therefore, the original use of RGB (R,g,b are 8bit unsigned) model, 4 points need to 8x3=24 bites (the first diagram below). And now only need 8+ (8/4) + (8/4) =12bites, an average of 12bites per point, so that the image of the data compression half.

+---------+| DB1 |+---------+--Create user and authorizeSqlplus/as SYSDBACreate user U1 identified by U1 account unlock default tablespace USERS;Create user U2 identified by U2 account unlock default tablespace USERS;Grant Connect,resource to U1;Grant Connect,resource to U2;Grant create public synonym to U2;Grant Selec

1 __author__="Stephen Yuan"2 Import Time3 4 classPerson (object):5 """man's class"""6 def __init__(self, name):7Super (person, self).__init__()8Self.name = Name#record a person's name9Self.gun = None#The default person is no gun.TenSELF.HP = 100#the default person's blood volume is One A defAnzhuang_zidan (self, Dan_jia_temp, zi_dan_temp): - """put the bullets in the magazine .""" - Dan_jia_temp.baocun_zidan (zi_dan_temp) the - defAnzhuang_danjia (self, AK47, Dan_jia):

input parameters are the same, instead, you can directly search for cached data based on input parameters! For example, use cache data as follows, Public static void test2 () {ApplicationContext ctx = new ClassPathXmlApplicationContext ("beans. xml "); UserService us = ctx. getBean ("userService", UserService. class); User u1 = us. getUsersByNameAndAge ("zhangsan", 50); // because the same parameter is used in the second call to the userService method, the real method will not be executed, // S

Is there a name for this address? $u1="http://share.feedsportal.com/share/gplus/?u=http%3A%2F%2Fwww.cnbeta.com%2Farticles%2F244192.htmt=%5B%E5%9B%BE%5D1366+x+768%E5%88%86%E8%BE%A8%E7%8E%87%2B%E8%A7%A6%E6%8E%A7+%E8%81%94%E6%83%B3ThinkPad+X240s%E8%B6%85%E6%9E%81%E6%9C%AC%E6%9B%9D%E5%85%89";$u2="http://t1.baidu.com/it/u=http%3A%2F%2Fauto.shm.com.cn%2Fattachement%2Fjpg%2Fsite1%2F20131008%2F001e90ad746b13bdae620a.jpgfm=30 How to use regular expressions

, from a8h the first 4 bytes for 0x0003, that is string_idsp[3], that is "Lfoo", representing the class type FooProto_idsProto is the prototype of the method, containing the input and output parameters of the method, each with a size of 12 bytes. Its data structure is/* * Direct-mapped "proto_id_item". */struct DexProtoId { u4 shortyIdx; /* index into stringIds for shorty descriptor */ u4 returnTypeIdx; /* index into typeIds list for return type */ u4 parametersOff;

between two ue, u1-> P1-> P2-> u2, and both proxies are willing to add record-route header fields. Message stream: [note] because we only care about the SIP routing mechanism here, the following headers irrelevant to the routing mechanism are omitted. U1 sends an invite request to p1 (P1 is the U1 outbound Proxy Server): Invite SIP: callee@domain.com Sip/2.0 Contact: SIP: caller@u1.example.com P1 is not responsible for the domain domain.com, and ther

We all know that Java files are compiled into a binary class file, but in most cases we know more about Java syntax, which helps us to write beautiful code, but we can write more efficient code if we know what's lower in Java. When researching findbugs tools, because of their use of bcel to process class files, this requires us to have a certain understanding of the basic structure of class files. Here is purely a record of my Learning class file structure of some summary, to more systematic in-

########################## character types in Python ########################### There are two types of characters in Python:# 1. STR type: A character in an ASCII table, which occupies one byte, so is also called a byte character. The literal is expressed in double quotation marks.# 2. Unicode type: The number of bytes consumed by a string is related to the encoding format used when saving. The literal is represented by double quotation marks with a "u" prefix.S=' OK, 'U=U ' Me, 'U1=U ' Me '

': u'x.x.x.x'} 0x04 MITM-Proxy MITM originated from Man-in-the-Middle Attack, which refers to Man-in-the-Middle attacks. generally, it intercepts, listens to, and tamper with data on the network between the client and the server. Mitmproxy is an open-source man-in-the-middle agent developed in Python. it supports SSL, transparent proxy, reverse proxy, traffic recording and playback, and custom scripts. Functions are similar to Fiddler in Windows, but mitmproxy is a console program with no GUI, b

); ElseLink (t[u].rc,mid+1, r,p,c);}voidMerge (intAMP;U1,intU2) { if(!u1| |! U2) {u1=u1+u2;return ;} T[U1].C+=t[u2].c;t[u1].sum+=t[u2].sum; Merge (T[U1].LC,T[U2].LC); Merge (t[u1].rc,t[u2].rc);} ll c[110000],d[110000];ll Que

I. Class File Content Note: Each Java class can only have one class file or interface. In the following discussion, U4 represents four bytes, while U2 represents two bytes. The content of the class file is as follows: Magic (magic number)-U4 (U4 indicates 4 bytes) 0 xcafebabe, which is used to easily identify Java class files and non-Java class files; Minor_version-u2 and major_version-