spring boot database example

Use Spring Boot to configure dynamic data sources to access multiple databases. I wrote a blog titled Spring + Mybatis + Mysql to build a distributed database access framework. It describes how to configure dynamic data sources through Spring + Mybatis to access multiple dat

configuration. about paging Plug-ins and general Mapper integration The paging plugin as an example of Plug-ins is available in the above code. The General mapper configuration is the actual configuration of the mapperscannerconfigurer when the use of Tk.mybatis.spring.mapper.MapperScannerConfigurer can be configured to use properties. the Spring boot integrated

following instruction to output the corresponding version to verify the installation success, the code is as follows:Successful output will appear in the console:Spring Boot CLI Hello World caseAfter installation, it is convenient to learn to use it under the Spring Boot CLI. For example, we learn how to write an

-annotations are grouped together so that we can simply write an annotation to represent two annotations.Example:(1) Example combination annotations Packagecom.ecworking.annotation;ImportOrg.springframework.context.annotation.ComponentScan;Importorg.springframework.context.annotation.Configuration;Importjava.lang.annotation.*; @Target (Elementtype.type) @Retention (retentionpolicy.runtime) @Documented @configuration//combining @configuration meta-anno

-annotation" > @RequestMapping ( "/") public String greeting () { return " Hello world! "; } public static void main (string[] args) {} /span> Run app: mvn spring-boot:run or run Main () method in the IDE, Access http://localhost:8080 in the browser, Hello world! appears on the page. With just more than 10 lines of Java code and a Hello World app running correctly, what exactly does this code do? We are from the entr

Baselineonmigrate totrueTo initialize the metadata table. At org.flywaydb.core.flyway$1.execute (flyway.java:1035) at org.flywaydb.core.flyway$1.execute (flyway.java:1006) at Org.flywaydb.core.Flyway.execute (Flyway.java:1418) at Org.flywaydb.core.Flyway.migrate (Flyway.java:1006) at Org.springframework.boot.autoconfigure.flyway.FlywayMigrationInitializer.afterPropertiesSet ( Flywaymigrationinitializer.java:66) at Org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invo

exception information logging and query.Connection pooling monitoring: monitor the status of the current system database connection pool to analyze SQL to identify system performance bottlenecks.Source source technical support for complete projects 17917433806. Source code Structure6. Registration CenterYou are welcome to study the relevant technology to understand the framework of technology or source of friends directly to seekSource source technic

Spring Boot application development started, springboot Application DevelopmentCreate a Spring Boot Application Spring Boot supports multiple integration methods, such as CLI, Maven, and Gradle. Here, Mavan is used as an

Listservice= Context.getbean (Listservice.class); System.out.println (Context.getenvironment (). GetProperty ("Os.name") + "List command under System is:" +listservice.showlistcmd ()); }}Operation Result:Only the Windows and Linux instances in the book were used for the first run, and the results were run listservice listservice = Context.getbean (Listservice.class); The times is wrong because there are no eligible instances created because I used a Mac that used to think that Mac was a Linux s

=jdbc:mysql://localhost:3306/test?useunicode=truecharacterencoding=utf-8 usessl=false Spring.datasource.username=Rootspring.datasource.password=123456Spring.datasource.driver-class-name=Com.mysql.jdbc.Driverspring.jpa.properties.hibernate.hbm2ddl.auto=ValidateIv. Creating a database access classImport Org.springframework.data.jpa.repository.JpaRepository;Import Org.springframework.data.jpa.repository.Query;Import Org.springframework.data.repository.qu

What's hot swapping in spring boot? Reloading the changes without restarting the server is called hot swapping, modern IDEs (Eclipse, Idea, etc.) Hot swapping of bytecode, so if you do a change that doesn ' t affect class or method signatures it should Reloa D cleanly with no side effects.Not affect class or method signatures, give me a concrete example.

and is also a configuration that is officially recommended by spring boot. In this new yml file, we add the following code Spring: DataSource: url:jdbc:mysql://190.0.1.88:3306/hello_test?useunicode=true username:root Password:root driver-class-name:com.mysql.jdbc.driver mybatis: mapper-locations: -classpath: Com/

, throw MyException exception[Java] View plain copy@Controllerpublic class Hellocontroller {@RequestMapping("/json") public String json() throws MyException { throw new MyException("发生错误2"); } }Create a corresponding processing for a myexception exception[Java] View plain copy@ControllerAdvicepublic class Globalexceptionhandler {@ExceptionHandler(value = MyException.class) @ResponseBody public ErrorInfo}Launch app, Access: Http://localhost:8080/json, you can get the following return co