Spring Boot + Kotlin Integrated MyBatis methods tutorial

preface

jpa has been used more recently, and mybatis's xml way of writing sql is not very pleasant. Interface definitions and mappings are separated in different files, making it not particularly convenient to read.

So use Spring Boot to integrate MyBatis and write sql in the annotations

Refer to my first Kotlin Application.

Create the project to introduce dependencies in the build.gradle file

compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:$mybatis_version"
compile "mysql:mysql-connector-java:$mysql_version"

The complete ES23en.gradle file

group 'name.quanke.kotlin'
version '1.0-SNAPSHOT'
buildscript {
 ext.kotlin_version = '1.2.10'
 ext.spring_boot_version = '1.5.4.RELEASE'
 ext.springfox_swagger2_version = '2.7.0'
 ext.mysql_version = '5.1.21'
 ext.mybatis_version = '1.1.1'
 repositories {
  mavenCentral()
 }
 dependencies {
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  classpath("org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version")

//  Kotlin integration SpringBoot The default parameter-free constructor, which sets all classes by default open Class plug-in 
  classpath("org.jetbrains.kotlin:kotlin-noarg:$kotlin_version")
  classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlin_version")
 }
}
apply plugin: 'kotlin'
apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin
apply plugin: 'org.springframework.boot'
apply plugin: "kotlin-jpa" //https://stackoverflow.com/questions/32038177/kotlin-with-jpa-default-constructor-hell
jar {
 baseName = 'chapter11-6-5-service'
 version = '0.1.0'
}
repositories {
 mavenCentral()
}
dependencies {
 compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
 compile("org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}")
 compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:$mybatis_version"
 compile "mysql:mysql-connector-java:$mysql_version"
 testCompile "org.springframework.boot:spring-boot-starter-test:$spring_boot_version"
 testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"

}
compileKotlin {
 kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
 kotlinOptions.jvmTarget = "1.8"
}

Configure the connection to mysql in the ES28en.yml file

spring:
 datasource:
 url: jdbc:mysql://localhost:3306/test
 username: root
 password: 123456
 driver-class-name: com.mysql.jdbc.Driver

Using MyBatis

Create the User table in Mysql with id(BIGINT), username(VARCHAR), age(INT) fields. At the same time, create the mapping object User

data class User(var id: Long? = -1, var username: String = "", val age: Int? = 0)

The operation UserMapper to create the User map implements the insert and query operations for subsequent unit test validation

import name.quanke.kotlin.chaper11_6_5.entity.User
import org.apache.ibatis.annotations.Insert
import org.apache.ibatis.annotations.Mapper
import org.apache.ibatis.annotations.Param
import org.apache.ibatis.annotations.Select
/**
 * Created by http://quanke.name on 2018/1/11.
 */
@Mapper
interface UserMapper {
 @Select("SELECT * FROM USER WHERE USERNAME = #{username}")
 fun findByUserName(@Param("username") username: String): List<User>
 @Insert("INSERT INTO USER(USERNAME, PASSWORD) VALUES(#{username}, #{password})")
 fun insert(@Param("username") username: String, @Param("password") password: String): Int
}

Start the Spring Boot class

import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
/**
 * Created by http://quanke.name on 2018/1/9.
 */
@SpringBootApplication
class Application
fun main(args: Array<String>) {
 SpringApplication.run(Application::class.java, *args)
}

Unit testing

import name.quanke.kotlin.chaper11_6_5.repository.UserMapper
import org.apache.commons.logging.LogFactory
import org.junit.Test
import org.junit.runner.RunWith
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.test.context.junit4.SpringRunner
import javax.annotation.Resource
/**
 * Created by http://quanke.name on 2018/1/9.
 */
@RunWith(SpringRunner::class)
@SpringBootTest
class ApplicationTests {
 val log = LogFactory.getLog(ApplicationTests::class.java)!!
 @Resource
 lateinit var userMapper: UserMapper
 @Test
 fun `MyBatis test"`() {
  log.info(" Query user name [ quanke.name Users of] : ${userMapper.findByUserName("quanke.name")}")
  userMapper.insert("quanke", "123")
  log.info(" Query user name [ quanke Users of] : ${userMapper.findByUserName("quanke")}")
 }
}

conclusion