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Mybatis (9) ------ Level 1 cache, level 2 cache, mybatis ------

= 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

Php static delayed static binding

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

Web Service Learning Vi: CXF resolving data types that cannot be processed

;Importjava.util.HashMap;Importjava.util.List;Importjava.util.Map;Importjavax.jws.WebService;ImportWs. hellowordi;ImportWs. User;/*** Class Description *@authorWangjunyu * @createDate 2016-7-10 a.m. 10:59:27 *@versionV1.0*/@WebService (endpointinterface= "ws." Hellowordi ", servicename=" Hellowordimpl ") public classHellowordimplImplementsHellowordi { publicstring Sayhi (string Name) {returnname+ "hello, The current time is:" +NewDate (); } publicListgetusers (user user) {System.out.println

"Deep understanding of Java virtual machines" Reading notes 3__java

: 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

"Python" III, scipy--"doing scientific calculations in Python" __python

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,

relational database design theory (4) decomposition of relational patterns

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

FFmpeg Introduction Summary (i)--YUV format example

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

Implementation of simple Modbus protocol based on AVR128

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

Oscdimg command line options using _dos/bat

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-

PHP Static delay statically binding

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

Oracle table empty Clean up common code segment finishing _oracle

code as follows: #重启数据库 Sqlplus '/as sysdba ' Sql>shutdown Immediate Sql>startup #创建一个临时表空间temp02, used as a temporary replacement Sql>create temporary tablespace temp02 tempfile '/u2/oradb/oradata/topprod/temp02.dbf ' size 10M autoextend on next 10M ; #将系统临时表空间指向temp02 Sql>alter database default temporary tablespace temp02; #删除原来的临时表空间temp Sql>drop tablespace temp including contents and datafiles; #创建新的临时表空间temp Sql>cr

oracle-User and table Space Creation command Summary

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

MySQL on-line configuration file

=512mbulk_insert_buffer_size =64mmyisam_sort_buffer_size=64mmyisam_max_sort_file_size=10gmyisam_repair_ Threads=1myisam_recoverlong_query_time=2slow_query_logslow_query_log_file=/data/mysql/slow.logskip-lockingskip-name-resolveserver-id= 1innodb_additional_mem_pool_size=16minnodb_buffer_pool_size=512minnodb_data_file _path=ibdata1:10m:autoextendinnodb_file_io_threads=4innodb_thread_concurrency= 8innodb_flush_log_at_trx_commit=1innodb_log_buffer_size=16minnodb_log_file_size =128minnodb_log_files_

C language write bomb man games

(! 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

Use a mysql memory table to replace the phpsession class

{ Mysql_query ($ SQL, $ this-> conn ); If (mysql_error ()){ Return false; } Else { Return true; } } } Private function getOne ($ SQL, $ die = false ){ $ Rs = $ this-> query ($ SQL, $ die ); If ($ rs ($ one = mysql_fetch_row ($ rs ))){ Return $ one [0]; } Else { Return false; } } Private function query ($ SQL, $ die = false ){ If ($ die) $ Rs = mysql_query ($ SQL, $ this-> conn) or die ("query SQL error: ". Mysql_error ()." ". $ SQL .""); Else

Solution to C ++ Design Pattern builder Pattern

-> setAnimation ("Biu ~ Biu ~ Biu ~ ");} Virtual void initSlot () {curWidget-> setSlot (" connected to your heart ");} CenterWidget * getResult () {return curWidget ;}; class ConcreteCenterWidgetBuilderB: public ConcreteCenterWidgetBuilderA {public: ConcreteCenterWidgetBuilderB () {} virtual ~ ConcreteCenterWidgetBuilderB () {}; // only rewrite the virtual void initAnimation () {curWidget-> setAnimation ("Boom ~ B

A class that replaces phpsession with a mysql memory table-php Tutorial

error:". Mysql_error ()."". $ SQL .""); Else $ Rs = mysql_query ($ SQL, $ this-> conn ); Return $ rs; } } $ Lnk = mysql_connect ('localhost', 'root', '123 ') Or die ('not ccted: '. mysql_error ()); // Make foo the current db Mysql_select_db ('test', $ lnk) or die ('Can/'t use foo: '. mysql_error ()); $ S = new session ($ lnk ); If (! $ S-> last ){ $ S-> last = time (); } Echo "First visit at". $ S-> last .""; If (

Use a mysql memory table to replace the phpsession class

false; } Else { Return true; } } } Private function getOne ($ SQL, $ die = false ){ $ Rs = $ this-> query ($ SQL, $ die ); If ($ rs ($ one = mysql_fetch_row ($ rs ))){ Return $ one [0]; } Else { Return false; } } Private function query ($ SQL, $ die = false ){ If ($ die) $ Rs = mysql_query ($ SQL, $ this-> conn) or die ("query SQL error: ". Mysql_error ()." ". $ SQL .""); Else $ Rs = mysql_query ($ SQL, $ this-> conn ); Return $ rs

HTML5 Canvas write colorful beads (6): Trial

, 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

A class that replaces the PHP session with a MySQL memory table

(Mysql_error ()) { return false; }else{ return true; } } } Private Function GetOne ($sql, $die =false) { $rs = $this->query ($sql, $die); if ($rs ($one = mysql_fetch_row ($rs))) { return $one [0]; }else{ return false; } } Private function Query ($sql, $die =false) { if ($die) $rs = mysql_query ($sql, $this->conn) or Die ("Query SQL error:". Mysql_error ()."". $sql."); Else $rs = mysql_query ($sql, $t

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