我的目標(biāo)是使用 datanucleus，java 中的 h2 數(shù)據(jù)庫進(jìn)行 CRUD 操作。但卡在連接 PersistenceManagerFactory 和 persistence.xml我嘗試過不同版本的 datanucleus-core、h2database、datanucleus-api-jdo。我目前參考的是官方文檔：http ://www.datanucleus.org/products/accessplatform/jdo/getting_started.html主代碼文件import javax.jdo.JDOHelper;import javax.jdo.PersistenceManager;import javax.jdo.PersistenceManagerFactory;public class Main { public static void main(String[] args) { PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory("Tutorial"); PersistenceManager pm = pmf.getPersistenceManager(); pm.currentTransaction().begin(); try { Users user = new Users(); user.setId(1); user.setUser("himmat"); user.setEmail("xyz@gmail.com"); user.setMobileNo("7896585687"); pm.currentTransaction().commit(); }finally { if(pm.currentTransaction().isActive()) { pm.currentTransaction().rollback(); } pm.close(); } }}持久性.xml<?xml version="1.0" encoding="UTF-8" ?><persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1"> <!-- JDO tutorial "unit" --> <persistence-unit name="Tutorial"> <class>Users</class> <exclude-unlisted-classes/> <properties> <property name="javax.jdo.option.ConnectionURL" value="jdbc:h2:mem:nucleus1"/> <property name="javax.jdo.option.ConnectionUserName" value="sa"/> <property name="javax.jdo.option.ConnectionPassword" value=""/> <property name="datanucleus.schema.autoCreateAll" value="true"/> </properties> </persistence-unit></persistence>
1 回答
慕勒3428872
TA貢獻(xiàn)1848條經(jīng)驗(yàn) 獲得超6個(gè)贊
您可以使用屬性而不是 persistence.xml 實(shí)際上，我已經(jīng)使用屬性做了一個(gè)類似的例子。另一個(gè)問題是你可能缺少一些依賴項(xiàng)，我正在共享 pom.xml。嘗試使用你可能會(huì)得到結(jié)果。如果您使用 Maven，這很容易做到。您還需要針對官方文檔中顯示的內(nèi)容進(jìn)行增強(qiáng)。
http://www.datanucleus.org/products/accessplatform/jdo/getting_started.html
為此，您需要遵循
http://www.datanucleus.org/products/accessplatform_3_2/jdo/enhancer.html
POM文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.automated</groupId>
<artifactId>DemoJDO</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-api-jdo</artifactId>
<version>5.2.1</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.199</version>
</dependency>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-rdbms</artifactId>
<version>5.2.1</version>
</dependency>
<dependency>
<groupId>javax.jdo</groupId>
<artifactId>jdo-api</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-core</artifactId>
<version>5.2.1</version>
</dependency>
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>javax.jdo</artifactId>
<version>3.2.0-m3</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-maven-plugin</artifactId>
<version>3.2.0-m3</version>
<configuration>
<log4jConfiguration>${basedir}/log4j.properties</log4jConfiguration>
<verbose>true</verbose>
</configuration>
<executions>
<execution>
<phase>process-classes</phase>
<goals>
<goal>enhance</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
主文件代碼
public static void main(String[] args)
{
Properties properties = new Properties();
properties.setProperty("javax.jdo.PersistenceManagerFactoryClass",
"org.datanucleus.api.jdo.JDOPersistenceManagerFactory");
properties.setProperty("javax.jdo.option.ConnectionDriverName","org.h2.Driver");
properties.setProperty("javax.jdo.option.ConnectionURL","jdbc:h2:~/test");
properties.setProperty("javax.jdo.option.ConnectionUserName","sa");
properties.setProperty("javax.jdo.option.ConnectionPassword","");
properties.setProperty("datanucleus.schema.autoCreateAll","true");
PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory(properties);
PersistenceManager pm = pmf.getPersistenceManager();
pm.currentTransaction().begin();
try {
//...
//You can use your logic here
//...
pm.currentTransaction().commit();
}finally {
if(pm.currentTransaction().isActive())
{
pm.currentTransaction().rollback();
}
pm.close();
}
}
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