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我試圖使用DataNucleus 2.1.1插入一個Employee對象到數據庫中,但是在執行「insert」準備語句之前沒有設置外鍵位置參數。我在做什麼,防止參數被設置?我是否留下了一些東西?閱讀工作正常。準備好的語句參數沒有在DataNucleus中設置
DEBUG [DataNucleus.Datastore.Native] - INSERT INTO MYSCHEMA.EMPLOYEE ("NAME",POSITION_ID,ID) VALUES (<'John Doe'>,<UNPRINTABLE>,<100>)
WARN [DataNucleus.Datastore.Persist] - Insert of object "[email protected] 7895d8" using statement "INSERT INTO MYSCHEMA.EMPLOYEE ("NAME",POSITION_ID,ID) VALUES (?,?,?)" failed : Invalid operation: parameter 2 not set or registered
PersistenceManager pm = // obtain PersistenceManager
Position position = // obtain Position using pm (I can post this code upon request)
Employee employee =new Employee(100, "John Doe", position);
pm.makePersistent(employee);
pm.close();
<jdo>
<package name="com.example.staff">
<class name="Position" identity-type="application" schema="MYSCHEMA" table="Position">
<inheritance strategy="new-table"/>
<field name="id" primary-key="true" persistence-modifier="persistent" default-fetch-group="true">
<column name="ID" jdbc-type="integer"/>
</field>
<field name="title" persistence-modifier="persistent" default-fetch-group="true">
<column name="TITLE" jdbc-type="varchar"/>
</field>
</class>
</package>
</jdo>
<jdo>
<package name="com.example.staff">
<class name="Employee" identity-type="application" schema="MYSCHEMA" table="EMPLOYEE">
<inheritance strategy="new-table"/>
<field name="id" primary-key="true" persistence-modifier="persistent" default-fetch-group="true">
<column name="ID" jdbc-type="integer"/>
</field>
<field name="name" persistence-modifier="persistent" default-fetch-group="true">
<column name="NAME" jdbc-type="varchar"/>
</field>
<field name="position" persistence-modifier="persistent" default-fetch-group="true">
<column name="POSITION_ID" jdbc-type="integer" />
</field>
</class>
</package>
</jdo>
@PersistenceCapable
public class Employee extends Object {
private Integer id;
private String name;
private Position position;
public Employee(Integer id, String name, Position position) {
this.id =id;
this.name =name;
this.position =position;
}
}
@PersistenceCapable
public class Position extends Object {
private Integer id;
private String title;
}
是的,我應該在測試用例中使用getObjectById()。任何想法可能會導致這種事情?我從來沒有想到,我可以做或不做任何事情會阻止持久層設置參數。 – user371320 2010-07-20 18:30:15
你不說*你怎麼得到你的案件中的對象。我使用getObjectById,因爲這是唯一明顯的方法。也許你用別的東西?不知道還有什麼沒有人能說的 – DataNucleus 2010-09-21 07:21:56