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Mybatis level 1 and level 2 cache, and mybatis Level 2 CacheLevel 1 Cache First, perform a test to create a mapper configuration file and mapper interface. Here I use the simplest query for demonstration. public interface UserMapper { List Then write a unit test Public class UserMapperTest {SqlSession sqlSession = null; @ Before public void setUp () throws Exception {// obtain the database connection in

C ++ data structure and algorithm _ 2 _ linear table, data structure and algorithm _ 2Application Example of sequence table-parallel operation and intersection operation of sequence table # Include "SeqList. h "using namespace std; // calculate void unionSL (SeqList /** Test data ** 5 1 2 3 4 5 6*4 11 2 3 4 9 ** 4 11 12 13 4 19 */ /* Output result (becaus

[Oracle] Chapter 2 common operations, Chapter 2 of oracle Chapter 2 common ORACLE operations Modify the column information in the table: Alter table vendor_master modify (vencode varchar (20 )); Add a default value constraint to the column in the table Alter table mytable modify (name varchar2 (20) default 'abc '); Add a primary key constraint to columns in an ex

Section 2 install eclipse Returned directory Eclipse.org provides download of the entire eclipse system, including SWT and jface. Download the main site is http://www.eclipse.org/downloads. Some image sites linked from the main site also provide eclipse download. You can download the eclipse executable file or its source code. The source code has two forms: zip file and CVS; the executable file is the zip package of a specific platform. Eclipse suppo

Linux special permission analysis (version 2) and linux Version 2SetUID [permission value = 4] Q: Why can ordinary users change their passwords? Ll $ (which passwd) 1. SetUID: When an executable program/command has the SetUID permission, the user executes the program as the owner of the program. 2. Add the SetUID permission: Chmod u + s [filename] Or chmod 4755 [filename] # SetUID permission value = 4 E

Float floating "1" clear: both clear floating; "2" set parent element overflow: hidden to clear floating, "1" and "2" Floating float Figure 1 First clear floating: add an empty element and set its css style to clear: both; Figure 2 Method 2: Set the overflow value of the parent element to hidden. We mentio

Today solves a keyboard conflict problem, suddenly think of a oneself think for a long time has not done experiment, a Windows computer, simultaneously access 2 USB mouse and 2 USB keyboard, the result how.In person, a Windows computer, with 2 USB mouse and 2 USB keyboard, can be used normally.Two keyboards can be type

2-6 Sayings 2: Repeat exercise 2-5, but store the name of the celebrity in the variable Famous_person, and then createTo display the message and store it in the variable message, and then print the message.'Albert Einstein'a person whonever made a mistake never tried anything new.' Print (Famous_person +" once Said,\""+message +"\ ".") To pay special attenti

Title Description:Given an integer array of length N (n>1), a can be divided into two parts, left part A[0..K],The right portion of the a[k+1..n-1],k can be evaluated in the range [0,n-2].In so many partitioning schemes, the largest value in the left part minus the absolute value of the right part maximum, what is the maximum?Given the integer array A and the size of the group N, return the answer to the question you asked.Test examples:[2,7,3,1,1],5R

Japan bo 365: "Alien" universe extension of sci-fi film "Prometheus" sequel named "Alien: Paradise Lost" (Alien:paradise Lost) not two months, director Ridley Scott in the new interview abandoned the name, changed to say "Prometheus 2" for "Alien: Contract" (Alien:covenant).Since Prometheus 2 will not go to Australia for filming next February, the film will not be released on December 31, 2017 when the new

Use php to generate static html pages (two common methods) and two static methods. Use php to generate static html pages (common 2 methods ), static 2 because each time a user clicks a dynamic link, the server will send data query requests. for a single access, php can generate a static html page (common 2 methods ), static Because each time a user clicks a dyna

Chapter 2 Arrays and ArrayLists Arrays are the most common data structures that appear in almost all programming languages. Using data in C # is essentially creating an Array object of the System. Array type. The System. Array class is composed of all arrays.AbstractionIt provides a series of methods to complete tasks that programmers have to manually implement in the past, such as sorting and searching. An interesting alternative to arrays in C # Is

Multi-thread exercises for beginners 2-snow effect, multithreading for beginners 2-snow This exercise does not directly use the interface that inherits the Thread class or Runnable to implement multithreading, but uses an anonymous internal class. Class to be imported: 1 import javax.swing.*;2 import java.awt.*; 1. Define the SowPanel class and inherit from the J

Title: Enter a m*n order matrix to find the maximum value of the second order matrix in the M*n matrixInput Sample:1 2 3 0 4;4 3 5 1 2;3 2 4 7 5Sample output:17------------------------------------------------I am a dividing line---------------------------------------------Java code:Import java.util.scanner;/** * 2*2-or

Ionic 2 program without Apple Computer packaged iOS platform--Update on Ionic 2 instance developmentSpring Festival just past, I wish you all the New year all the best, smooth sailing."Ionic 2 Instance development" updated the following during this period:Using pipelines to process data in Ionic 2Interacting data with remote servers using HTTP in Ionic 2Styles an

By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2>1In fact, it should be equivalent to this: 1>/dev/null 2>/dev/null, by default is 1, standard output, so gener

Based on Marco Linux primary video 2-3 1. The first level directory under the root file #ls/ 1./boot The system launches the related file. such as kernel, INITRD (initialization run directory) 2./dev Device files: Includes block device (random access), character device (linear access, in characters), device number (main device number and secondary device number) 3./etc Configuration file 4./Home

java resolves byte 2 of an exception 2-byte UTF-8 sequence Invalid problem Recently done the project, encountered an exception 2 bytes of the UTF-8 sequence of bytes 2 invalid problem, the Internet to find the next data, here to record the solution, have encountered the same problem everyone, you can see Verbose exce

Tags: style blog color OS strong IO data forThis note is mainly about creating tables, creating constraints, adding and deleting databases. Experience: 1, it's best to consider what data to use when building a table, because using inappropriate data wastes space 2, each table should have a link, no Contact table is meaningless .3, make the table and do the constraints separate to do ... Look clear and easy to understand4, the field is best to b