Spring Boot + Kotlin整合MyBatis的方法教程

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

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

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-pluginapply plugin: 'org.springframework.boot'apply plugin: "kotlin-jpa" //https://stackoverflow.com/questions/32038177/kotlin-with-jpa-default-constructor-helljar { 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

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

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

import name.quanke.kotlin.chaper11_6_5.entity.Userimport org.apache.ibatis.annotations.Insertimport org.apache.ibatis.annotations.Mapperimport org.apache.ibatis.annotations.Paramimport org.apache.ibatis.annotations.Select/** * Created by http://quanke.name on 2018/1/11. */@Mapperinterface 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

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

单元测试

import name.quanke.kotlin.chaper11_6_5.repository.UserMapperimport org.apache.commons.logging.LogFactoryimport org.junit.Testimport org.junit.runner.RunWithimport org.springframework.boot.test.context.SpringBootTestimport org.springframework.test.context.junit4.SpringRunnerimport javax.annotation.Resource/** * Created by http://quanke.name on 2018/1/9. */@RunWith(SpringRunner::class)@SpringBootTestclass 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")}") }}

总结

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