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我的持久类上有一个依赖映射...我在想 indexed="true" 会导致 DN 为生成的表上的键和值列添加索引，但它似乎完全被忽略了。当然我可以手动添加索引..但是有没有办法让DN通过注释（首选）或xml为我做这件事？

@Persistent
@Key(types=String.class,indexed="true",index = "key_idx")
@Value(types=String.class,dependent="true",indexed="true",index = "value_idx")
@Join
private Map<String,String> metadata = new HashMap<>();

作为对 DN 评论的回应，它正在使用 mysql……这是我可以找到的相关日志和生成的架构……还有什么我可以添加的东西来帮助找出我做错了什么吗？：

DataNucleus.Datastore.Schema:58 - Column "account_metadata.id_oid" added to internal representation of table.
DataNucleus.Datastore:58 - Field [com.core.data.account.Account.metadata] -> Column(s) [account_metadata.id_oid] using mapping of type "org.datanucleus.store.mapped.mapping.PersistableMapping" (org.datanucleus.store.rdbms.mapping.IntegerRDBMSMapping)
DataNucleus.Datastore.Schema:58 - Column "account_metadata.`key`" added to internal representation of table.
DataNucleus.Datastore:58 - Field [com.core.data.account.Account.metadata] -> Column(s) [account_metadata.`key`] using mapping of type "org.datanucleus.store.mapped.mapping.StringMapping" (org.datanucleus.store.rdbms.mapping.VarCharRDBMSMapping)
DataNucleus.Datastore.Schema:58 - Column "account_metadata.`value`" added to internal representation of table.
DataNucleus.Datastore:58 - Field [com.core.data.account.Account.metadata] -> Column(s) [account_metadata.`value`] using mapping of type "org.datanucleus.store.mapped.mapping.StringMapping" (org.datanucleus.store.rdbms.mapping.ClobRDBMSMapping)

DataNucleus.Datastore.Schema:58 - Validating 2 index(es) for table account_metadata
DataNucleus.Datastore.Schema:58 - Validating 1 foreign key(s) for table account_metadata
DataNucleus.Datastore.Schema:58 - Validating 1 unique key(s) for table account_metadata

CREATE TABLE `account_metadata` (
  `id_oid` int(11) NOT NULL,
  `key` varchar(64) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL,
  `value` mediumtext,
  PRIMARY KEY (`id_oid`,`key`),
  KEY `account_metadata_n49` (`id_oid`),
  CONSTRAINT `account_metadata_fk1` FOREIGN KEY (`id_oid`) REFERENCES `account` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
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1 回答 1

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DataNucleus 的 SVN 主干现在支持对映射连接表的键/值列的索引，其中键/值是非持久的（以前仅支持嵌入式键/值）。

于 2012-10-30T14:53:18.330 回答