Question

我正在尝试使用以下方法更新可用用户的角色

    PersistenceManager pm = connectionFactory.getPersistenceManager();
    Transaction tx = pm.currentTransaction();
    tx.begin();
    try {
        Query query = pm.newQuery(User.class, "email == '" + email + "'");
        List<User> user = (List<User>) query.execute();
        user.get(0).getRoles().clear();
        for (Role r : roles) {
            user.get(0).getRoles().add(pm.getObjectById(Role.class, r.getId()));
        }
        tx.commit();
        return true;
    } catch (Exception e) {
        throw e;
    } finally {
        if (tx.isActive())
            tx.rollback();
        pm.close();
    }

我观察到的是，并非所有角色都被分配了。它是不一致的，有时候会分配3个角色中的3个，有时候所有角色都被分配，有时候不属于它们。

根据我所了解的文件，

更新对象需要现有的PersistenceManager实例。
pm.makePersistent（）。
要更新对象，需要使用tx.begin（）和tx.commit（）。

有人能告诉我我做错了吗？

我正在使用MySQL作为数据库。

--- ---编辑

@PersistenceCapable(table = "USER_INFO")
public class User{
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    @Column(name = "USER_ID")
    private Long Id;
    @Persistent
    @Column(name = "EMAIL")
    private String email;
    @Persistent
    @Column(name = "PASSWORD")
    private String password;
    @Persistent
    @Column(name = "USERNAME")
    private String username;
    @Persistent
    @Column(name = "PHONE_NUMBER")
    private String phonenumber;
    @Column(name = "VALID")
    private Boolean isValidUser = true;
    @Persistent
    @Column(name = "ACTIVE")
    private String active;

    @Persistent(table = "USER_ROLE_RELATION", defaultFetchGroup = "true")
    @Join(column = "USER_ID")
    @Element(column = "ROLE_ID")
    private List<Role> role = new ArrayList<Role>();

    @Persistent(table = "USER_STREAM_RELATION", defaultFetchGroup = "true")
    @Join(column = "USER_ID")
    @Element(column = "STREAM_ID")
    private List<Stream> stream = new ArrayList<Stream>();

}

@PersistenceCapable(table = "ROLE")
public class Role implements Serializable {
    private static final long serialVersionUID = 2600988373295393375L;
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY, column = "ROLE_ID")
    private Long id;
    @Unique
    @Persistent(column = "ROLE_NAME")
    private String roleName;
    @Persistent(mappedBy = "role")
    private List<UserInfo> user;
}

我正在尝试更新角色。这是删除以前添加的角色并添加新角色

抛出异常：

  2017-01-25 15:09:11 DEBUG Datastore:58 - Using PreparedStatement "org.datanucleus.store.rdbms.ParamLoggingPreparedStatement@6e68bf64"
2017-01-25 15:09:11 DEBUG Native:58 - INSERT INTO `USER_ROLE_RELATION` (`ROLE_ID`,`USER_ID`,`IDX`) VALUES (<3>,<1>,<1>) 
  2017-01-25 15:09:11 DEBUG NewPooledConnection:430 - com.mchange.v2.c3p0.impl.NewPooledConnection@7d7d54ba handling a throwable.
  com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '3-1' for key 'PRIMARY'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:971)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:971)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)

2017-01-25 15:09:11 DEBUG DefaultConnectionTester:126 - Testing a Connection in response to an Exception:
  com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '3-1' for key 'PRIMARY'
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:971)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)

JDO更新操作列表不起作用

0 个答案: