我在很多projets中使用Hibernate。自从我开发了我的项目以来,包括一个翻译表,其中包含每种语言的文本值,用于每个需要它的表。对于转换表Hibernate参数注入映射,可能吗?
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class dynamic-insert="false" dynamic-update="false" mutable="true" name="com.spectotechnologies.website.common.helper.TranslationValue" optimistic-lock="version" polymorphism="implicit" select-before-update="false" table="common_translations">
<id name="keyTranslation">
<generator class="native"/>
</id>
<property name="keyLanguage"/>
<property name="tableName"/>
<property name="fieldName"/>
<property name="keyRow"/>
<property name="value"/>
</class>
</hibernate-mapping>
一个对象为例需要翻译
映射文件:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class dynamic-insert="false" dynamic-update="false" mutable="true" name="com.spectotechnologies.website.common.helper.Category" optimistic-lock="version" polymorphism="implicit" select-before-update="false" table="common_categories">
<id name="keyCategory">
<generator class="native"/>
</id>
<property name="keyParent"/>
<property name="tag"/>
<property name="name" insert="false" update="false"/>
<property name="description" insert="false" update="false"/>
</class>
</hibernate-mapping>
目前,我用这种SQL查询来加载对象
"SELECT" +
" c.keyCategory," +
" c.keyParent," +
" c.tag," +
" tn.value AS name," +
" td.value AS description" +
" FROM common_categories c" +
// name
" LEFT JOIN common_translations tn" +
" ON tn.tableName = 'common_categories'" +
" AND tn.fieldName = 'name'" +
" AND tn.keyRow = c.keyCategory" +
" AND tn.keyLanguage = ?" +
// description
" LEFT JOIN common_translations td" +
" ON td.tableName = 'common_categories'" +
" AND td.fieldName = 'description'" +
" AND td.keyRow = c.keyCategory" +
" AND td.keyLanguage = ?" +
" ORDER BY" +
" c.keyCategory ASC"
我想知道是否有可能在映射内部传递这种左连接,为此我需要包含参数:tableName,fieldName,language。
您对此的帮助将非常感谢,我将能够简化大量查询!
编辑:
这里是我所期望的一个例子:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class dynamic-insert="false" dynamic-update="false" mutable="true" name="com.spectotechnologies.website.common.helper.Category" optimistic-lock="version" polymorphism="implicit" select-before-update="false" table="common_categories">
<id name="keyCategory">
<generator class="native"/>
</id>
<property name="keyParent"/>
<property name="tag"/>
<one-to-many class="com.spectotechnologies.website.common.helper.TranslationValue"
formula="tableName = 'common_categories' AND fieldName = 'name' AND keyLanguage = @language AND keyRow = keyCategory" name="name" />
<one-to-many class="com.spectotechnologies.website.common.helper.TranslationValue"
formula="tableName = 'common_categories' AND fieldName = 'description' AND keyLanguage = @language AND keyRow = keyCategory" name="description" />
</class>
</hibernate-mapping>
在这种情况下,我需要创建一个变量@language,可以在查询时被注入。这个解决方案有两个问题:
我不知道是否有可能将变量发布到映射范围。
当然,但如何注入语言参数?每种用户会话的语言都不相同。实际上,tableName和fieldName可以在映射中被硬编码,但不是语言。 –
检索所有语言的所有翻译,但使用会话中定义的语言的唯一翻译 – StanislavL
如果我需要从结果中丢弃未成文的翻译,则不会对其进行优化。明天我会看看是否有可能从查询中丢弃。 –