我正在使用 MongoDB、Java、JDO 和 Maven。
我运行了一个简单的主应用程序,它存储了一些垃圾数据并从 mongodb 检索它,它看起来不错,但我想开始编写适当的单元测试。模拟实际的数据库交互对我来说似乎不是很有帮助,所以从技术上讲,我想编写功能测试来检查与数据库的完整交互。
我的单元测试是这样设置的:
static final Logger LOG = LoggerFactory.getLogger(DaoTest.class);
static final int PORT = 100001;
static Process mongod;
static PersistenceManagerFactory pmf;
// Class under test.
Dao dao;
@BeforeClass
public static void beforeAll() throws Exception {
File mongoDir = new File(
System.getProperty("java.io.tmpdir"),
"mongodb-" + System.currentTimeMillis());
mongoDir.deleteOnExit();
mongod = Runtime.getRuntime().exec(String.format(
"/bin/sh -c mongod --dbpath=%s --port=%d",
mongoDir.getAbsolutePath(),
PORT));
LOG.info("Mongodb using {} on port {}.", mongoDir.getAbsolutePath(), PORT);
Thread.sleep(1000);
pmf = JDOHelper.getPersistenceManagerFactory("mongodbtest");
LOG.info("DB connection URL: {}.", pmf.getConnectionURL());
}
@AfterClass
public static void afterAll() throws Exception {
mongod.destroy();
}
@Before
public void setUp() throws Exception {
dao = new Dao(pmf);
}
src/test/resources/META-INF/persistence.xml 是这样的:
<?xml version="1.0" encoding="UTF-8" ?>
<persistence ...>
<persistence-unit name="mongodbtest">
<properties>
<property name="javax.jdo.PersistenceManagerFactoryClass"
value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory" />
<property name="javax.jdo.option.ConnectionURL" value="mongodb://localhost:100001/contacts"/>
<property name="javax.jdo.option.RetainValues" value="true"/>
<property name="datanucleus.autoCreateSchema" value="true" />
<property name="datanucleus.validateTables" value="false" />
<property name="datanucleus.validateConstraints" value="false" />
<property name="datanucleus.storeManagerType" value="mongodb" />
</properties>
</persistence-unit>
</persistence>
最后,我使用 mvn clean test 执行我的单元测试,仅此一项就可以工作,直到我添加一个尝试保存数据的实际测试。我收到以下错误:
Mongodb using /var/folders/00/0l550000h01000cxqpysvccm002cmm/T/mongodb-1373820849219 on port 100001.
DB connection URL: mongodb://localhost:100001/contacts.
Jul 14, 2013 12:54:10 PM com.mongodb.DBTCPConnector initDirectConnection
WARNING: Exception executing isMaster command on localhost/127.0.0.1:27017
java.io.IOException: couldn't connect to [localhost/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused
at com.mongodb.DBPort._open(DBPort.java:214)
at com.mongodb.DBPort.go(DBPort.java:107)
...
Jul 14, 2013 12:54:10 PM com.mongodb.DBTCPConnector initDirectConnection
WARNING: Exception executing isMaster command on localhost/127.0.0.1:27017
java.io.IOException: couldn't connect to [localhost/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused
at com.mongodb.DBPort._open(DBPort.java:214)
at com.mongodb.DBPort.go(DBPort.java:107)
...
ul 14, 2013 12:54:10 PM com.mongodb.DBPortPool gotError
WARNING: emptying DBPortPool to localhost/127.0.0.1:27017 b/c of error
java.io.IOException: couldn't connect to [localhost/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused
at com.mongodb.DBPort._open(DBPort.java:214)
at com.mongodb.DBPort.go(DBPort.java:107)
...
Jul 14, 2013 12:54:10 PM org.datanucleus.store.valuegenerator.AbstractGenerator obtainGenerationBlock
INFO: Error encountered allocating block of IDs : can't call something : localhost/127.0.0.1:27017//localhost:100001/contacts
127.0.0.1:27017 是 mongodb 的默认设置,但我不知道为什么要使用它。我可以看到它正在从我的 persistence.xml 文件中获取配置,所以我很困惑。mongo文档说连接字符串 URL 格式是:
mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]
到目前为止,我只是通过 maven 运行它,因为这只是我到目前为止的情况,但我最终会遇到的另一个问题是如何在 Eclipse 中运行这些单元测试。我假设要在 Eclipse 中运行这些测试,必须进行字节码增强过程,但我不知道如何设置它。
我猜我不是第一个想要做这样的事情的人。有没有用 Java 编写功能性数据库测试的标准实践?我做错了吗?