query_hql.po

hibernate-distribution-3.3.1.GA-dist.zip源码

#: query_hql.xml:219
#, no-c-format
msgid ""
"The <literal>implicit</literal> form does not use the join keyword. Instead, "
"the associations are \"dereferenced\" using dot-notation. <literal>implicit</"
"literal> joins can appear in any of the HQL clauses. <literal>implicit</"
"literal> join result in inner joins in the resulting SQL statement."
msgstr ""
"<literal>implicit（隐式）</literal>形式不使用join关键字。关联使用\"点号\"来进"
"行“引用”。<literal>implicit</literal> join可以在任何HQL子句中出现."
"<literal>implicit</literal> join在最终的SQL语句中以inner join的方式出现。"

#. Tag: programlisting
#: query_hql.xml:226
#, no-c-format
msgid "<![CDATA[from Cat as cat where cat.mate.name like '%s%']]>"
msgstr ""

#. Tag: title
#: query_hql.xml:230
#, no-c-format
msgid "Refering to identifier property"
msgstr "Refering to identifier property"

#. Tag: para
#: query_hql.xml:232
#, no-c-format
msgid ""
"There are, generally speaking, 2 ways to refer to an entity's identifier "
"property:"
msgstr ""
"There are, generally speaking, 2 ways to refer to an entity's identifier "
"property:"

#. Tag: para
#: query_hql.xml:237
#, no-c-format
msgid ""
"The special property (lowercase) <literal>id</literal> may be used to "
"reference the identifier property of an entity <emphasis>provided that "
"entity does not define a non-identifier property named id</emphasis>."
msgstr ""
"The special property (lowercase) <literal>id</literal> may be used to "
"reference the identifier property of an entity <emphasis>provided that "
"entity does not define a non-identifier property named id</emphasis>."

#. Tag: para
#: query_hql.xml:244
#, no-c-format
msgid ""
"If the entity defines a named identifier property, you may use that property "
"name."
msgstr ""
"If the entity defines a named identifier property, you may use that property "
"name."

#. Tag: para
#: query_hql.xml:250
#, no-c-format
msgid ""
"References to composite identifier properties follow the same naming rules. "
"If the entity has a non-identifier property named id, the composite "
"identifier property can only be referenced by its defined named; otherwise, "
"the special <literal>id</literal> property can be used to rerference the "
"identifier property."
msgstr ""
"References to composite identifier properties follow the same naming rules. "
"If the entity has a non-identifier property named id, the composite "
"identifier property can only be referenced by its defined named; otherwise, "
"the special <literal>id</literal> property can be used to rerference the "
"identifier property."

#. Tag: para
#: query_hql.xml:257
#, fuzzy, no-c-format
msgid ""
"Note: this has changed significantly starting in version 3.2.2. In previous "
"versions, <literal>id</literal> <emphasis>always</emphasis> referred to the "
"identifier property no matter what its actual name. A ramification of that "
"decision was that non-identifier properties named <literal>id</literal> "
"could never be referenced in Hibernate queries."
msgstr ""
"Note: this has changed significantly starting in version 3.2.2. In previous "
"versions, <literal>id</literal><emphasis>always</emphasis> referred to the "
"identifier property no matter what its actual name. A ramification of that "
"decision was that non-identifier properties named <literal>id</literal> "
"could never be referenced in Hibernate queries."

#. Tag: title
#: query_hql.xml:266
#, no-c-format
msgid "The select clause"
msgstr "select子句"

#. Tag: para
#: query_hql.xml:268
#, no-c-format
msgid ""
"The <literal>select</literal> clause picks which objects and properties to "
"return in the query result set. Consider:"
msgstr ""
"<literal>select</literal> 子句选择将哪些对象与属性返 回到查询结果集中. 考虑如"
"下情况:"

#. Tag: programlisting
#: query_hql.xml:273
#, no-c-format
msgid ""
"<![CDATA[select mate\n"
"from Cat as cat\n"
"    inner join cat.mate as mate]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:275
#, no-c-format
msgid ""
"The query will select <literal>mate</literal>s of other <literal>Cat</"
"literal>s. Actually, you may express this query more compactly as:"
msgstr ""
"该语句将选择<literal>mate</literal>s of other <literal>Cat</literal>s。（其他"
"猫的配偶） 实际上, 你可以更简洁的用以下的查询语句表达相同的含义:"

#. Tag: programlisting
#: query_hql.xml:280
#, no-c-format
msgid "<![CDATA[select cat.mate from Cat cat]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:282
#, no-c-format
msgid ""
"Queries may return properties of any value type including properties of "
"component type:"
msgstr ""
"查询语句可以返回值为任何类型的属性，包括返回类型为某种组件(Component)的属性:"

#. Tag: programlisting
#: query_hql.xml:286
#, no-c-format
msgid ""
"<![CDATA[select cat.name from DomesticCat cat\n"
"where cat.name like 'fri%']]>"
msgstr ""

#. Tag: programlisting
#: query_hql.xml:288
#, no-c-format
msgid "<![CDATA[select cust.name.firstName from Customer as cust]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:290
#, no-c-format
msgid ""
"Queries may return multiple objects and/or properties as an array of type "
"<literal>Object[]</literal>,"
msgstr ""
"查询语句可以返回多个对象和（或）属性，存放在 <literal>Object[]</literal>队列"
"中,"

#. Tag: programlisting
#: query_hql.xml:295
#, no-c-format
msgid ""
"<![CDATA[select mother, offspr, mate.name\n"
"from DomesticCat as mother\n"
"    inner join mother.mate as mate\n"
"    left outer join mother.kittens as offspr]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:297
#, no-c-format
msgid "or as a <literal>List</literal>,"
msgstr "或存放在一个<literal>List</literal>对象中,"

#. Tag: programlisting
#: query_hql.xml:301
#, no-c-format
msgid ""
"<![CDATA[select new list(mother, offspr, mate.name)\n"
"from DomesticCat as mother\n"
"    inner join mother.mate as mate\n"
"    left outer join mother.kittens as offspr]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:303
#, no-c-format
msgid "or as an actual typesafe Java object,"
msgstr "也可能直接返回一个实际的类型安全的Java对象,"

#. Tag: programlisting
#: query_hql.xml:307
#, no-c-format
msgid ""
"<![CDATA[select new Family(mother, mate, offspr)\n"
"from DomesticCat as mother\n"
"    join mother.mate as mate\n"
"    left join mother.kittens as offspr]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:309
#, no-c-format
msgid ""
"assuming that the class <literal>Family</literal> has an appropriate "
"constructor."
msgstr "假设类<literal>Family</literal>有一个合适的构造函数."

#. Tag: para
#: query_hql.xml:313
#, no-c-format
msgid ""
"You may assign aliases to selected expressions using <literal>as</literal>:"
msgstr "你可以使用关键字<literal>as</literal>给“被选择了的表达式”指派别名:"

#. Tag: programlisting
#: query_hql.xml:317
#, no-c-format
msgid ""
"<![CDATA[select max(bodyWeight) as max, min(bodyWeight) as min, count(*) as "
"n\n"
"from Cat cat]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:319
#, no-c-format
msgid ""
"This is most useful when used together with <literal>select new map</"
"literal>:"
msgstr "这种做法在与子句<literal>select new map</literal>一起使用时最有用:"

#. Tag: programlisting
#: query_hql.xml:323
#, no-c-format
msgid ""
"<![CDATA[select new map( max(bodyWeight) as max, min(bodyWeight) as min, "
"count(*) as n )\n"
"from Cat cat]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:325
#, no-c-format
msgid ""
"This query returns a <literal>Map</literal> from aliases to selected values."
msgstr ""
"该查询返回了一个<literal>Map</literal>的对象，内容是别名与被选择的值组成的名-"
"值映射。"

#. Tag: title
#: query_hql.xml:332
#, no-c-format
msgid "Aggregate functions"
msgstr "聚集函数"

#. Tag: para
#: query_hql.xml:334
#, no-c-format
msgid ""
"HQL queries may even return the results of aggregate functions on properties:"
msgstr "HQL查询甚至可以返回作用于属性之上的聚集函数的计算结果:"

#. Tag: programlisting
#: query_hql.xml:338
#, no-c-format
msgid ""
"<![CDATA[select avg(cat.weight), sum(cat.weight), max(cat.weight), count"
"(cat)\n"
"from Cat cat]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:349
#, no-c-format
msgid "The supported aggregate functions are"
msgstr "受支持的聚集函数如下："

#. Tag: literal
#: query_hql.xml:356
#, no-c-format
msgid "avg(...), sum(...), min(...), max(...)"
msgstr "avg(...), sum(...), min(...), max(...)"

#. Tag: literal
#: query_hql.xml:361
#, no-c-format
msgid "count(*)"
msgstr "count(*)"

#. Tag: literal
#: query_hql.xml:366
#, no-c-format
msgid "count(...), count(distinct ...), count(all...)"
msgstr "count(...), count(distinct ...), count(all...)"

#. Tag: para
#: query_hql.xml:371
#, no-c-format
msgid ""
"You may use arithmetic operators, concatenation, and recognized SQL "
"functions in the select clause:"
msgstr "你可以在选择子句中使用数学操作符、连接以及经过验证的SQL函数："

#. Tag: programlisting
#: query_hql.xml:376
#, no-c-format
msgid ""
"<![CDATA[select cat.weight + sum(kitten.weight)\n"
"from Cat cat\n"
"    join cat.kittens kitten\n"
"group by cat.id, cat.weight]]>"
msgstr ""

#. Tag: programlisting
#: query_hql.xml:378
#, no-c-format
msgid ""
"<![CDATA[select firstName||' '||initial||' '||upper(lastName) from Person]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:380
#, no-c-format
msgid ""
"The <literal>distinct</literal> and <literal>all</literal> keywords may be "
"used and have the same semantics as in SQL."
msgstr ""
"关键字<literal>distinct</literal>与<literal>all</literal> 也可以使用，它们具"
"有与SQL相同的语义."

#. Tag: programlisting
#: query_hql.xml:385
#, no-c-format
msgid ""
"<![CDATA[select distinct cat.name from Cat cat\n"
"\n"
"select count(distinct cat.name), count(cat) from Cat cat]]>"
msgstr ""

#. Tag: title
#: query_hql.xml:390
#, no-c-format
msgid "Polymorphic queries"
msgstr "多态查询"

#. Tag: para
#: query_hql.xml:392
#, no-c-format
msgid "A query like:"
msgstr "一个如下的查询语句:"

#. Tag: para
#: query_hql.xml:398
#, no-c-format
msgid ""
"returns instances not only of <literal>Cat</literal>, but also of subclasses "
"like <literal>DomesticCat</literal>. Hibernate queries may name "
"<emphasis>any</emphasis> Java class or interface in the <literal>from</"
"literal> clause. The query will return instances of all persistent classes "
"that extend that class or implement the interface. The following query would "
"return all persistent objects:"
msgstr ""
"不仅返回<literal>Cat</literal>类的实例, 也同时返回子类 <literal>DomesticCat</"
"literal>的实例. Hibernate 可以在<literal>from</literal>子句中指定<emphasis>任"
"何</emphasis> Java 类或接口. 查询会返回继承了该类的所有持久化子类 的实例或返"
"回声明了该接口的所有持久化类的实例。下面的查询语句返回所有的被持久化的对象："

#. Tag: programlisting
#: query_hql.xml:406
#, no-c-format
msgid "<![CDATA[from java.lang.Object o]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:408
#, no-c-format
msgid ""
"The interface <literal>Named</literal> might be implemented by various "
"persistent classes:"
msgstr "接口<literal>Named</literal> 可能被各种各样的持久化类声明："

#. Tag: programlisting
#: query_hql.xml:413
#, no-c-format
msgid "<![CDATA[from Named n, Named m where n.name = m.name]]>"
msgstr ""

#. Tag: para
#: query_hql.xml:415
#, no-c-format
msgid ""
"Note that these last two queries will require more than one SQL "
"<literal>SELECT</literal>. This means that the <literal>order by</literal> "
"clause does not correctly order the whole result set. (It also means you "
"can't call these queries using <literal>Query.scroll()</literal>.)"
msgstr ""
"注意，最后的两个查询将需要超过一个的SQL <literal>SELECT</literal>.这表明"
"<literal>order by</literal>子句 没有对整个结果集进行正确的排序. (这也说明你不"
"能对这样的查询使用<literal>Query.scroll()</literal>方法.)"

#. Tag: title
#: query_hql.xml:424