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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"
}

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")}")
}
}

参考

欢迎关注:

《Spring Boot in kotlin 实战》

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