= sessionFactory Based on sqlSessionFactory. openSession (); String statement = "one. to. one. mapper. ordersMapper. selectOrderAndUserByOrderID "; UserMapper userMapper = sqlSession. getMapper (UserMapper. class); // For the first query, issue an SQL statement and put the query result into the cache. User u1 = userMapper. selectUserByUserId (1); System. out. println (u1); // The second query. Because it is the same sqlSession, the query results will be searched in the cache. // If yes, the que
If you are a lazy programmer, you may be annoyed when you see the following code:
Abstract class U {
}
Class u1 extends U {
Public static function create (){
Return new u1 ();
}
}
Class u2 extends U {
Public static function create (){
Return new u2 ();
}
}
This code works normally, but it is annoying to have a lot of repeated code.
I don't want to add the create method to each subclass. If you put the creat
: unsigned numbers and tables
Among them, in U1, U2, U4, U8 to represent 1 bytes, 2 bytes, 4 bytes and 8 bytes of unsigned numbers, you can describe the number, index reference, quantity value, UTF-8 encoded string values.
Tables are used to describe the data for a hierarchical composite structure, with the following types: Cp_info, Field_info, Method_info, Attribute_info
Note: When describing data of the same type but with indefinite quantity, a forw
resulting from the generation of x into the equations; x0 is the initial value of the unknown vector. If you want to solve the following equation group:
F1 (U1,U2,U3) = 0
F2 (u1,u2,u3) = 0
f3 (u1,u2,u3) = 0Then func can be defined as follows:
def func (x):
u1,u2,u3 = x return
[F1 (U1,
one, the decomposition of the relationship model
1, the process of decomposing a relational pattern into several relational patterns is called the decomposition of the relational pattern.2. DefinitionThe decomposition of the relational schema rΡ={r1Where U=u1∪u2∪ ... ∪k, and there is no Ui≤uj (the table UI is contained in Uj,1≤i,j≤k),Fi is a projection of F on the UI, that is, fi={x→y∈f+∧xy≤ui} (table XY is included in the UI).Example 4.4
form a macro pixel.
4:2:0: This sample does not mean that there is only Y,CB and no CR component, where 0 of the U,v component is sampled once. For example, the first line sampled 4:2:0, the second line sampled 4:0:2, and so on ... In this sampling mode, an average of 1.5 bytes per pixel is consumed.
4:2:2 Example
If the original data three pixels is [Y0 U0 V0], [Y1 U1 v1],[y2 U2 v2],[y3 U3 V3]
After 4:2:2 sampling, the data becomes Y0 U0, Y1 V1, Y2
data need more frames and time. The RTU mode uses a compressed hexadecimal representation, a byte can compress two data, so that the same number of frames in the RTU mode can transmit more data.Modbus Data frame check is divided into two ways: CRC cyclic redundancy check and LRC longitudinal redundancy check. Use the following Proteus Simulation atmega128. two tablets - serial communication between the serial communication, the running is simple Modbus agreement. The simulation diagram looks l
with a Unicode file name. This option cannot be used in combination with-N,-nt, or-D options.
-u2
Generates an image that contains only the UFD file system. Any system that cannot read UFD will see only one default text file, warning the user that the image is only available on the computer that supports the UDF. This option cannot be used in combination with-N,-nt, or-D options.
-ur
Overrides the default text file for the-
If you are a lazy programmer, you see the following code may be annoyed abstract class u{ } class U1 extends u{ NBSP;PU Blic static function Create () { return new U1 (); } } class U2 E Xtends u{ public static function Create () { return new U2 (); }} This code is Regular work is no problem, but a lot of repetitive code can be annoying I don't want to add a create method to each subclass, and if yo
The "preface" is explained in the blog post:This article will introduce the User and table space creation related commands through personal tone, in the current time point "May 16, 2017 " under the grasp of the technical level is limited, there may be a lot of knowledge understanding is not enough in-depth or comprehensive, I hope you point out the issue of common exchange, In the follow-up work and study, if found that the content of this article and the actual situation is biased, will improve
(! RegisterClass (wndclass)){MessageBox (NULL, TEXT ("This program requires Windows nt!"), Szappname, Mb_iconerror);return 0;}hwnd = CreateWindow (szappname,//window class nameTEXT ("Windows application design--the Maze"),//Window captionWs_overlappedwindow,//Window styleCw_usedefault,//initial X positionCw_usedefault,//initial y position//cw_usedefault,//initial x size//cw_usedefault,//Initial y sizeNULL,//parent window HandleNULL,//Window menu handleHINSTANCE,//program instance handleNULL); C
, continuous lines must be connected and rewarded when settlement is made.The isClick parameter is mainly used to determine whether the user clicks to cancel the line or whether the new bubble is generated by the new bubble. If the condition is not met and the request is sent in, the request cannot be sent in again. Otherwise, an endless loop is generated.
The satisfied Line Elimination code is also relatively simple, that is, playing a line Elimination animation. In fact, this animation is real
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