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我有一個類Autor和一個類Dokument，它們之間有一個雙向的1對n列表關係（1個Autor可以寫幾個文檔），我想將它們保存到Cloud SQL中。 orm在package.jdo和package-cloudsql.orm中指定。JDO雙向一對多關係添加對象
庫門類：
public class Autor {
private String aid;
private String vorname;
private String nachname;
private List<Dokument> dokumente;
public Autor() {
}
public Autor(String vorname, String nachname) {
this.vorname = vorname;
this.nachname = nachname;
this.dokumente = new ArrayList<Dokument>();
}
public String getAID() {
return aid;
}
public String getVorname() {
return vorname;
}
public String getNachname() {
return nachname;
}
public List<Dokument> getDokumente() {
return this.dokumente;
}
public void setAID(String aid) {
this.aid = aid;
}
public void setVorname(String vorname) {
this.vorname = vorname;
}
public void setNachname(String nachname) {
this.nachname = nachname;
}
public void addDokument(Dokument dokument) {
this.dokumente.add(dokument);
}
public void deleteDokument(Dokument dokument) {
this.dokumente.remove(dokument);
}
public void deleteAllDokumente() {
this.dokumente.clear();
}
}
庫門類：
public class Dokument {
private String did;
private Autor autor;
private String titel;
private String text;
private Date datum;
public Dokument() {
}
public Dokument(Autor autor, String titel, String text, Date datum) {
this.autor = autor;
this.titel = titel;
this.text = text;
this.datum = datum;
}
public Dokument(String titel, String text, Date datum) {
this.autor = null;
this.titel = titel;
this.text = text;
this.datum = datum;
}
public String getDid() {
return did;
}
public Autor getAutor() {
return autor;
}
public String getTitel() {
return titel;
}
public String getText() {
return text;
}
public Date getDatum() {
return datum;
}
public void setDID(String did) {
this.did = did;
}
public void setAutor(Autor autor) {
this.autor = autor;
}
public void setTitel(String titel) {
this.titel = titel;
}
public void setText(String text) {
this.text = text;
}
public void setDatum(Date date) {
this.datum = date;
}
}
package.jdo包含此：
<class name="Autor" detachable="true" identity-type="application">
<field name="aid" primary-key="true" persistence-modifier="persistent" value-strategy="identity"/>
<field name="vorname"/>
<field name="nachname" />
<field name="dokumente"/>
</class>
<class name="Dokument" detachable="true" identity-type="application">
<field name="did" primary-key="true" persistence-modifier="persistent" value-strategy="identity"/>
<field name="autor"/>
<field name="titel"/>
<field name="text"/>
<field name="datum"/>
</class>
包sql.orm包含此：
<class name="Autor" detachable="true" persistence-modifier="persistence-capable" table="Autor">
<field name="aid" primary-key="true" persistence-modifier="persistent" value-strategy="identity">
<column name="aid" jdbc-type="bigint" length="20"/>
</field>
<field name="vorname" persistence-modifier="persistent">
<column name="vorname"/>
</field>
<field name="nachname" persistence-modifier="persistent">
<column name="nachname"/>
</field>
<field name="dokumente" persistence-modifier="persistent" mapped-by="autor">
<collection element-type="de.hdm.studienarbeit3.dokumente.Dokument"/>
</field>
</class>
<class name="Dokument" detachable="true" persistence-modifier="persistence-capable" table="Dokument">
<field name="did" primary-key="true" persistence-modifier="persistent" value-strategy="identity">
<column name="did" jdbc-type="bigint" length="20" />
</field>
<field name="autor" persistence-modifier="persistent" default-fetch-group="true">
<column name="autor" jdbc-type="bigint" length="20"/>
<foreign-key name="DOKUMENTAUTOR_FK" delete-action="restrict"/>
</field>
<field name="titel" persistence-modifier="persistent">
<column name="titel"/>
</field>
<field name="text" persistence-modifier="persistent">
<column name="text"/>
</field>
<field name="datum" persistence-modifier="persistent">
<column name="datum"/>
</field>
</class>
所以我想添加第二個（第三等）Dokument到現有的作者。但是每次我堅持一個Dokument時，它也會創建一個新的Autor，它具有我選擇的Autor的屬性。 例如我有Autor ID 1名稱「漢斯邁爾」，並希望與他創建另一個Dokument作爲作者，但新的dokument將有一個作者與id 2和名字「漢斯邁爾」什麼是不希望的。我希望新的文件也可以連接到作者1。
我有這樣的代碼在我的servlet：
if (autoraid=="") {
if (vorname == "" | nachname =="") {
resp.getWriter().println("Bitte Autor auswählen oder Namen vollständig ausfüllen.");
} else {
Autor autor = new Autor(vorname, nachname);
Dokument dokument = new Dokument(autor, titel, text, datum);
autor.addDokument(dokument);
DokumentDAO dokumentDao = new DokumentDAO(pmf);
dokumentDao.addDokument(autor, dokument);
}
} else {
AutorDAO autorDao = new AutorDAO(pmf);
Autor autor = autorDao.getAutor(autoraid);
Dokument dokument = new Dokument(autor, titel, text, datum);
autor.addDokument(dokument);
DokumentDAO dokumentDao = new DokumentDAO(pmf);
dokumentDao.addDokument(autor, dokument);
}
autorDao.getAutor返回其已通過密鑰（這工作）和dokumentDao.addDokument（得到的作者日期）堅持與pm.makePersistent給定庫門（ dokument）
我在想什麼或做錯了什麼？ Datanucleus文檔說我必須在雙向關係中使用List時設置兩端http://www.datanucleus.org/products/accessplatform/jdo/orm/relationships.html我在設置Dokument創建者和autor.addDokument（）上的Autor時做了什麼，但它不起作用。
如果我在讀取dokument.getAutor（）。getAID（）之前持久化它返回我希望它連接到的作者的正確ID，但是在數據庫中它是一個新的作者。我怎樣才能讓它工作正確？
我已閱讀本http://www.onjava.com/pub/a/onjava/excerpt/chap_07/index2.html和createBook方法正是我想做的事情，所以我還測試了在交易中做
public void addDokument(Autor autor, Dokument dokument) {
PersistenceManager pm = pmf.getPersistenceManager();
Transaction tx = pm.currentTransaction();
try {
tx.begin();
dokument.setAutor(autor);
autor.addDokument(dokument);
pm.makePersistent(dokument);
tx.commit();
} catch (Exception e) {
System.out.println("Exception: " + e.getMessage());
} finally {
if (tx.isActive()) {
tx.rollback();
}
pm.close();
}
}
，但同樣的結果，創建一個新的作者日期。
任何幫助將不勝感激。
日誌說以下內容：
Feb 18, 2014 1:23:33 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalDateMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
Feb 18, 2014 1:23:33 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalDateTimeMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
Feb 18, 2014 1:23:33 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalTimeMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
Feb 18, 2014 1:23:39 PM org.datanucleus.store.rdbms.query.ForwardQueryResult closingConnection
Information: Reading in results for query "SELECT FROM de.hdm.studienarbeit3.dokumente.Autor ORDER BY nachname asc" since the connection used is closing
Feb 18, 2014 1:23:52 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalDateMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
Feb 18, 2014 1:23:52 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalDateTimeMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
Feb 18, 2014 1:23:52 PM org.datanucleus.store.rdbms.mapping.MappedTypeManager addMappedType
Schwerwiegend: User-defined type mapping class "org.datanucleus.store.mapped.mapping.LocalTimeMapping" was not found. Please check the mapping file class specifications and your CLASSPATH. The class must be in the CLASSPATH.
org.datanucleus.store.mapped.mapping *用於在DataNucleus將核心（至少在3.1.3版本）。但是現在在3.2版本。 9。它不在嗎？它去了哪裏？ datanucleus-rdbms也是3.2.9版本。
System.getProperty的輸出（ 「java.class.path」）
[workspace]\studienarbeit3\war\WEB-INF\classes
[workspace]\studienarbeit3\war\WEB-INF\lib\mysql-connector-java-5.1.28-bin.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\appengine-local-runtime-shared.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\el-api.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp\repackaged-appengine-ant-1.7.1.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp\repackaged-appengine-ant-launcher-1.7.1.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp\repackaged-appengine-jasper-6.0.29.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp\repackaged-appengine-jasper-el-6.0.29.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp\repackaged-appengine-tomcat-juli-6.0.29.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\jsp-api.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\shared\servlet-api.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\appengine-tools-api.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\appengine-api-labs\v1\appengine-api-labs.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\appengine-endpoints\v1\appengine-endpoints-deps.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\appengine-endpoints\v1\appengine-endpoints.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\jsr107\v1\appengine-jsr107cache-1.8.9.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\jsr107\v1\jsr107cache-1.1.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\user\appengine-api-1.0-sdk-1.8.9.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\asm-4.0.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\datanucleus-api-jdo-3.2.8.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\datanucleus-appengine-3.0.0.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\datanucleus-core-3.2.9.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\datanucleus-rdbms-3.2.9.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\jdo-api-3.1-rc1.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\opt\user\datanucleus\v3\jta-1.1.jar
[workspace]\studienarbeit3\war\WEB-INF\lib\javax.servlet.jsp.jstl-1.2.1.jar
[workspace]\studienarbeit3\war\WEB-INF\lib\javax.servlet.jsp.jstl-api-1.2.1.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\impl\google_sql.jar
[eclipse]\plugins\com.google.appengine.eclipse.sdkbundle_1.8.9\appengine-java-sdk-1.8.9\lib\agent\appengine-agent.jar
「它不起作用」。那麼爲什麼不精確呢？日誌說什麼？它告訴你關於對象的生命週期等等，狀態對象在被持久化時處於狀態，並且你不提供類或者確切的持久性代碼，所以猜測就是人們留下的所有東西。日誌就是爲了這種情況（請不要回頭說「日誌裏沒有東西」，因爲當使用DEBUG級別時它將是一個大文件）。 –
我想爲您提供日誌，但我不知道它在哪裏。你能告訴我在哪裏可以找到它嗎？我從這裏http://www.datanucleus.org/products/accessplatform/logging.html複製的java.util.logging中的例子，但找不到任何輸出 – Philipp
我現在已經添加類和DokumentDao.addDokument的代碼（ Autor Autor，Dokument dokument） – Philipp