Programmer Think

First of all, consider using cache for processing. If the cache is not enough, then use read-write separation for implementation application.yml configures two data sources #Default usage configuration spring: profiles: active: dev --- #Development and configuration spring: profiles: dev datasource: master: jdbc-url: jdbc: ...

Tools: eclipse jdk 1.8 oracle 11g ojdbc6.jar(Database driver package) Six steps of JDBC: Here we follow these six steps of jdbc: Registration driven Get connection Get execution sql statement object Execute sql statement Process result set close resource URL: Uniform Resource Locator oracle URL: jdbc:orac ...

Create a database first CREATE TABLE user (   id varchar(32) CHARACTER SET utf8 NOT NULL,   name varchar(50) CHARACTER SET utf8 DEFAULT NULL ,   dflag char(1) CHARACTER SET utf8 DEFAULT NULL ,   PRIMARY KEY (`id`) ) jdbc.properties configuration mysql.driver=com.mysql.jdbc.Driver mysql.url=jdbc:mysql://127.0.0.1:3306/qingmu?char ...

I. use annotation to integrate mybatis The project contents are as follows Step 1: import the jar package <build> <resources> <!-- mapper.xml File in java Directory --> <resource> <directory>src/main/java</directory> <includes> ...

1. Create a new project in idea, file - > New - > project. Select Maven, pay attention to jdk1.8, and click Next. 2.k here, Group,Artifactld, click Next. 3. Click finish. 4.ssm_parent1 is the parent class and does not write anything. Then four modules need to be created under ssm_parent1: ...

I. deployment Designer 1. Put flowable-idm.war and flowable-modeler.war into the webapps directory of tomcat, and then start Tomcat. 2. Access in browser http://localhost:8080/flowable-modeler , user name / password: admin/test login, save and export the file after designing the process. Two code 1 create a process engine and deploy a pro ...

Article directory Mybaits primary key value updating Return the primary key value generated by the current session (supported by MySQL and Oracle) Test it. You can write back the primary key value by setting the attribute. The principle is unknown (only supported by MySQL) Test it. Mybaits pri ...

The so-called Class Loader is to load Java classes into the Java virtual machine.< Interviewer, stop asking me "Java virtual machine class loading mechanism" >The mechanism for loading class files is described in. This article focuses on the loader and parental delegation mechanism. Class loader There are three types of classloa ...

Background If spring project needs to test small functions, it takes time and effort to start the whole project. You can use spring test package to unit test, accelerate project development and testing. Two, use 1. Add maven dependency <dependency> <groupId>junit</groupId> ...

Spring auto assembly Spring makes use of dependency injection (DI) to complete the assignment of the dependencies of various components in the IOC container. [1]@Autowired @Autowired annotation, which can annotate class member variables, methods and constructors to complete the work of automatic assembly. Use @ Autowired to eliminate the set an ...