为什么Eclipse提出“对象”作为数据类型“文本”的默认映射类型？ [英] Why does Eclipse propose "Object" as default mapping type for datatype "Text"?
本文介绍了为什么Eclipse提出“对象”作为数据类型“文本”的默认映射类型？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当使用Eclipse生成JPA实体（Java EE开发人员的Juno 4.2）时，它将$ code> Object 作为属性的默认映射类型，设置为文本。
这是非常烦人的，因为我必须手动将它们全部设置为 String 。
有人遇到这种问题，知道该怎么办？这是一个bug吗？ Eclipse Indigo不这样做。
When generating JPA Entities from tables with Eclipse (Juno 4.2 for Java EE Developers) it proposes Object as default mapping type for properties I set to be Text.
That is quite annoying as I would have to set them all to String manually.
Has someone encountered that kind of problem and knows what to do? Is this a bug? Eclipse Indigo does not behave like that.
这是 /runtime/vendors/MySql_5.1/MySql_5.1.xmi 从 org.eclipse.datatools.enablement.mysql.dbdefinition_1.0.4.v201109022331.jar :(但是根据这个文件 Text 应该映射到 String 这必须是错误的文件 - 但如何找到正确的一个？）
This is the /runtime/vendors/MySql_5.1/MySql_5.1.xmi from org.eclipse.datatools.enablement.mysql.dbdefinition_1.0.4.v201109022331.jar: (But as according to this file Text should be mapped to String this must be the wrong file - but how to find out the right one?)
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<operators>!</operators>
<operators>BINARY</operators>
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</DBDefinition:DatabaseVendorDefinition>
我的SQL：
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`name` text,
`id` int(11) NOT NULL AUTO_INCREMENT,
`flour_id` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `fk_bread_flour_idx` (`flour_id`),
CONSTRAINT `fk_bread_flour` FOREIGN KEY (`flour_id`) REFERENCES `flour` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
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/*!40000 ALTER TABLE `bread` ENABLE KEYS */;
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/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
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/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
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-- Dump completed on 2012-11-13 8:53:50
推荐答案
Dali (the part of Eclipse that generates JPA entities) uses DTP (another part of Eclipse) to determine the Java attribute type for a particular data type. These mappings are database platform-specific and are specified in .xmi files in various DTP plug-ins.
Dali (the part of Eclipse that generates JPA entities) uses DTP (another part of Eclipse) to determine the Java attribute type for a particular data type. These mappings are database platform-specific and are specified in .xmi files in various DTP plug-ins.
For example, in Juno, for PostgreSQL, the data type ABSTIME is mapped to the Java type java.lang.Object in the file
/runtime/vendors/postgresql/postgresql_8.x.xmi
in the plug-in jar
./plugins/org.eclipse.datatools.enablement.postgresql.dbdefinition_1.0.2.v201110070445.jar.
For example, in Juno, for PostgreSQL, the data type ABSTIME is mapped to the Java type java.lang.Object in the file
/runtime/vendors/postgresql/postgresql_8.x.xmi
in the plug-in jar
./plugins/org.eclipse.datatools.enablement.postgresql.dbdefinition_1.0.2.v201110070445.jar.
Depending on your database platform and what other plug-ins you have installed, these settings could have changed between Indigo and Juno. You can extract the appropriate .xmi file, edit it, and return it to its jar and this should alter how entities are generated.
Depending on your database platform and what other plug-ins you have installed, these settings could have changed between Indigo and Juno. You can extract the appropriate .xmi file, edit it, and return it to its jar and this should alter how entities are generated.
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