Spring Boot + Kotlin整合MyBatis的方法教程_Java教程

前言

最近使用jpa比较多，再看看mybatis的xml方式写sql觉得不爽，接口定义与映射离散在不同文件中，使得阅读起来并不是特别方便。

因此使用Spring Boot去整合MyBatis，在注解里写sql

参考《我的第一个Kotlin应用》

创建项目，在build.gradle文件中引入依赖

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									compile "org.mybatis.spring.boot:mybatis-spring-boot-starter:$mybatis_version"

									compile "mysql:mysql-connector-java:$mysql_version"

完整的build.gradle文件

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									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整合SpringBoot的默认无参构造函数，默认把所有的类设置open类插件

									  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"

									}

在application.yml文件中配置mysql的连接

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									spring:

									 datasource:

									 url: jdbc:mysql://localhost:3306/test

									 username: root

									 password: 123456

									 driver-class-name: com.mysql.jdbc.Driver

使用MyBatis

在Mysql中创建User表，包含id(BIGINT)、username(VARCHAR)、age(INT)字段。同时，创建映射对象User

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

创建User映射的操作UserMapper，为了后续单元测试验证，实现插入和查询操作

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									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

									}

启动 Spring Boot 类

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									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)

									}

单元测试

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									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("查询用户名为【quanke.name】的用户：${userMapper.findByUserName("quanke.name")}")

									  userMapper.insert("quanke", "123")

									  log.info("查询用户名为【quanke】的用户：${userMapper.findByUserName("quanke")}")

									 }

									}