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Spring Boot 与 Kotlin 整合MyBatis

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-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

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.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

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

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")}")


 }

}

原文 http://quanke.name/posts/45445/

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