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"
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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://*.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"
}
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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
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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 )
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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
}
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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)
}
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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 ")}" )
}
}
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总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。
原文链接:https://www.jianshu.com/p/5aa64238a4bc