ORM选择ebean,当然也有很多其它ORM框架可选,这里不谈,看个人,团队的环境需求。
model:
这个模型的表关系有一对多,多对一
@Table(name = "Test")
class AppModel ( @Id var id: Long? = null, @Column(name = "name", length = 100, nullable = false, unique = true) var name: String, @Column(name = "status", nullable = true) var status: Test.Status, @CreatedTimestamp @Column(name = "createTime", nullable = true) var createTime: Long = System.currentTimeMillis(), @UpdatedTimestamp @Column(name = "updateTime", nullable = true) var updateTime: Long = System.currentTimeMillis(), @OneToMany(cascade= arrayOf(CascadeType.ALL), mappedBy = "r") val appR: MutableSet<RModel> = mutableSetOf(), @OneToMany(cascade = arrayOf(CascadeType.ALL), mappedBy = "a") var appW: MutableSet<WModel> = mutableSetOf()
ebean学习http://ebean-orm.github.io/
数据库配置:
ebean.dev.properties
ebean.autotune.querytuning=false ebean.autotune.profiling=true ebean.autotune.profilingUpdateFrequency=5 ebean.ddl.generate=true ebean.ddl.run=true datasource.username=root datasource.password=123456datasource.databaseUrl=jdbc:mysql://127.0.0.1:3306/test?useUnicode=yes&characterEncoding=utf8&useSSL=false datasource.databaseDriver=com.mysql.jdbc.Driver
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这里的数据库配置有点特别,ebean.dev.properites,中间为什么有个dev,这主要是为了上线动态替换配置。如果有了配置管理系统,如Disconf,不用这么写了。怎样动态替换呢?
class EbeanServerProvider : Provider<EbeanServer> {
override fun get(): EbeanServer { val config = ServerConfig() val profile = System.getProperty("profile") ?: "dev" val props = Properties() props.load(javaClass.getResourceAsStream("/ebean.$profile.properties")) config.loadFromProperties(props) config.name = "default" config.isDefaultServer = true config.isRegister = true return EbeanServerFactory.create(config) } }
启动应用时,动态把标签加载进JVM
怎样动态写入JVM呢?
在启动脚本里加入这段
classpath: JAVA_OPTS="-Dprofile=testing"
初始化数据库
companion object {
@JvmStatic fun main(args: Array<String>) { val logger = LoggerFactory.getLogger(Application::class.java)!! if (!AgentLoader.loadAgentFromClasspath("ebean-agent","debug=1;packages=com.ymatou.op.app.server.domain")) { logger.error("ebean-agent not found in classpath - not dynamically loaded") System.exit(1) } val application = Application() application.start() application.blockUntilShutdown() } }
不只这点配置,只是注解,单例模式,高度模块化了,这里不方便贴出来。
其中数据库工作,整个框架工作原理,我还在消化阶段
ebean 增删查改
pagedList = ebean.find(ApModel::class.java)
.order().desc("id") .setFirstRow((page - 1) * size) .setMaxRows(size) .findPagedList()