Spring Boot 与 Kotlin 使用JdbcTemplate连接MySQL数据库的方法

compile "org.springframework.boot:spring-boot-starter-jdbc:$spring_boot_version"

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

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'
 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'
jar {
 baseName = 'chapter11-6-1-service'
 version = '0.1.0'
}
repositories {
 mavenCentral()
}
dependencies {
 compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
 compile "org.springframework.boot:spring-boot-starter-web:$spring_boot_version"
 compile "org.springframework.boot:spring-boot-starter-jdbc:$spring_boot_version"
 compile "mysql:mysql-connector-java:$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"
}

spring:
 datasource:
 url: jdbc:mysql://localhost:3306/test
 username: root
 password: 123456
 driver-class-name: com.mysql.jdbc.Driver

spring.datasource.jndi-name=java:jboss/datasources/customers

interface UserService {
 /**
  * 获取用户总量
  */
 val allUsers: Int?
 /**
  * 新增一个用户
  * @param name
  * @param age
  */
 fun create(name: String, password: String?)
 /**
  * 根据name删除一个用户高
  * @param name
  */
 fun deleteByName(name: String)
 /**
  * 删除所有用户
  */
 fun deleteAllUsers()
}

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.jdbc.core.JdbcTemplate
import org.springframework.stereotype.Service
/**
 * Created by http://quanke.name on 2018/1/10.
 */
@Service
class UserServiceImpl : UserService {
 @Autowired
 private val jdbcTemplate: JdbcTemplate? = null
 override val allUsers: Int?
  get() = jdbcTemplate!!.queryForObject("select count(1) from USER", Int::class.java)
 override fun create(name: String, password: String?) {
  jdbcTemplate!!.update("insert into USER(USERNAME, PASSWORD) values(?, ?)", name, password)
 }
 override fun deleteByName(name: String) {
  jdbcTemplate!!.update("delete from USER where USERNAME = ?", name)
 }
 override fun deleteAllUsers() {
  jdbcTemplate!!.update("delete from USER")
 }
}

/**
 * Created by http://quanke.name on 2018/1/9.
 */
@RunWith(SpringRunner::class)
@SpringBootTest
class ApplicationTests {
 val log = LogFactory.getLog(ApplicationTests::class.java)!!
 @Autowired
 lateinit var userService: UserService
 @Test
 fun `jdbc test"`() {
  val username = "quanke"
  val password = "123456"
  // 插入5个用户
  userService.create("$username a", "$password 1")
  userService.create("$username b", "$password 2")
  userService.create("$username c", "$password 3")
  userService.create("$username d", "$password 4")
  userService.create("$username e", "$password 5")
  log.info("总共用户 ${userService.allUsers}")
  // 删除两个用户
  userService.deleteByName("$username a")
  userService.deleteByName("$username b")
  log.info("总共用户 ${userService.allUsers}")
 }
}