association_mapping.po

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

"        <many-to-many column=\"addressId\"\n"
"            class=\"Address\"/>\n"
"    </set>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"</class>]]>"
msgstr ""

#. Tag: programlisting
#: association_mapping.xml:141 association_mapping.xml:246
#, no-c-format
msgid ""
"<![CDATA[\n"
"create table Person ( personId bigint not null primary key )\n"
"create table PersonAddress ( personId bigint not null, addressId bigint not "
"null, primary key (personId, addressId) )\n"
"create table Address ( addressId bigint not null primary key )\n"
"        ]]>"
msgstr ""

#. Tag: title
#: association_mapping.xml:148
#, no-c-format
msgid "Bidirectional associations"
msgstr "双向关联（Bidirectional associations）"

#. Tag: title
#: association_mapping.xml:151 association_mapping.xml:211
#, fuzzy, no-c-format
msgid "one to many / many to one"
msgstr ""
"#-#-#-#-#  - (PACKAGE VERSION)  #-#-#-#-#\n"
"一对多（one to many) / 多对一（many to one）\n"
"#-#-#-#-#  - (PACKAGE VERSION)  #-#-#-#-#\n"
"一对多（one to many） /多对一（ many to one）"

#. Tag: para
#: association_mapping.xml:153
#, no-c-format
msgid ""
"A <emphasis>bidirectional many-to-one association</emphasis> is the most "
"common kind of association. (This is the standard parent/child relationship.)"
msgstr ""
"<emphasis>双向多对一关联</emphasis> 是最常见的关联关系。（这也是标准的父/子关"
"联关系。）"

#. Tag: programlisting
#: association_mapping.xml:159
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <many-to-one name=\"address\" \n"
"        column=\"addressId\"\n"
"        not-null=\"true\"/>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <set name=\"people\" inverse=\"true\">\n"
"        <key column=\"addressId\"/>\n"
"        <one-to-many class=\"Person\"/>\n"
"    </set>\n"
"</class>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:163
#, no-c-format
msgid ""
"If you use a <literal>List</literal> (or other indexed collection) you need "
"to set the <literal>key</literal> column of the foreign key to <literal>not "
"null</literal>, and let Hibernate manage the association from the "
"collections side to maintain the index of each element (making the other "
"side virtually inverse by setting <literal>update=\"false\"</literal> and "
"<literal>insert=\"false\"</literal>):"
msgstr ""
"如果你使用<literal>List</literal>(或者其他有序集合类)，你需要设置外键对应的"
"<literal>key</literal>列为 <literal>not null</literal>,让Hibernate来从集合端"
"管理关联，维护每个元素的索引（通过设置<literal>update=\"false\"</literal> "
"and <literal>insert=\"false\"</literal>来对另一端反向操作）。"

#. Tag: programlisting
#: association_mapping.xml:171
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"   <id name=\"id\"/>\n"
"   ...\n"
"   <many-to-one name=\"address\"\n"
"      column=\"addressId\"\n"
"      not-null=\"true\"\n"
"      insert=\"false\"\n"
"      update=\"false\"/>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"   <id name=\"id\"/>\n"
"   ...\n"
"   <list name=\"people\">\n"
"      <key column=\"addressId\" not-null=\"true\"/>\n"
"      <list-index column=\"peopleIdx\"/>\n"
"      <one-to-many class=\"Person\"/>\n"
"   </list>\n"
"</class>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:173
#, no-c-format
msgid ""
"It is important that you define <literal>not-null=\"true\"</literal> on the "
"<literal>&lt;key&gt;</literal> element of the collection mapping if the "
"underlying foreign key column is <literal>NOT NULL</literal>. Don't only "
"declare <literal>not-null=\"true\"</literal> on a possible nested "
"<literal>&lt;column&gt;</literal> element, but on the <literal>&lt;key&gt;</"
"literal> element."
msgstr ""
"假若集合映射的<literal>&lt;key&gt;</literal>元素对应的底层外键字段是"
"<literal>NOT NULL</literal>的，那么为这一key元素定义<literal>not-null=\"true"
"\"</literal>是很重要的。不要仅仅为可能的嵌套<literal>&lt;column&gt;</literal>"
"元素定义<literal>not-null=\"true\"</literal>，<literal>&lt;key&gt;</literal>"
"元素也是需要的。"

#. Tag: para
#: association_mapping.xml:187
#, no-c-format
msgid ""
"A <emphasis>bidirectional one-to-one association on a foreign key</emphasis> "
"is quite common."
msgstr "<emphasis>基于外键关联的双向一对一关联</emphasis>也很常见。"

#. Tag: programlisting
#: association_mapping.xml:192
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <many-to-one name=\"address\" \n"
"        column=\"addressId\" \n"
"        unique=\"true\"\n"
"        not-null=\"true\"/>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"   <one-to-one name=\"person\" \n"
"        property-ref=\"address\"/>\n"
"</class>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:195
#, no-c-format
msgid ""
"A <emphasis>bidirectional one-to-one association on a primary key</emphasis> "
"uses the special id generator."
msgstr "<emphasis>基于主键关联的一对一关联</emphasis>需要使用特定的id生成器。"

#. Tag: programlisting
#: association_mapping.xml:200
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <one-to-one name=\"address\"/>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"foreign\">\n"
"            <param name=\"property\">person</param>\n"
"        </generator>\n"
"    </id>\n"
"    <one-to-one name=\"person\" \n"
"        constrained=\"true\"/>\n"
"</class>]]>"
msgstr ""

#. Tag: title
#: association_mapping.xml:208
#, no-c-format
msgid "Bidirectional associations with join tables"
msgstr "使用连接表的双向关联（Bidirectional associations with join tables）"

#. Tag: para
#: association_mapping.xml:213
#, no-c-format
msgid ""
"A <emphasis>bidirectional one-to-many association on a join table</"
"emphasis>. Note that the <literal>inverse=\"true\"</literal> can go on "
"either end of the association, on the collection, or on the join."
msgstr ""
"<emphasis>基于连接表的双向一对多关联</emphasis>。注意<literal>inverse=\"true"
"\"</literal>可以出现在关联的任意一端，即collection端或者join端。"

#. Tag: programlisting
#: association_mapping.xml:219
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <set name=\"addresses\" \n"
"        table=\"PersonAddress\">\n"
"        <key column=\"personId\"/>\n"
"        <many-to-many column=\"addressId\"\n"
"            unique=\"true\"\n"
"            class=\"Address\"/>\n"
"    </set>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <join table=\"PersonAddress\" \n"
"        inverse=\"true\" \n"
"        optional=\"true\">\n"
"        <key column=\"addressId\"/>\n"
"        <many-to-one name=\"person\"\n"
"            column=\"personId\"\n"
"            not-null=\"true\"/>\n"
"    </join>\n"
"</class>]]>"
msgstr ""

#. Tag: programlisting
#: association_mapping.xml:220
#, no-c-format
msgid ""
"<![CDATA[\n"
"create table Person ( personId bigint not null primary key )\n"
"create table PersonAddress ( personId bigint not null, addressId bigint not "
"null primary key )\n"
"create table Address ( addressId bigint not null primary key )\n"
"        ]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:227
#, no-c-format
msgid ""
"A <emphasis>bidirectional one-to-one association on a join table</emphasis> "
"is extremely unusual, but possible."
msgstr ""
"<emphasis>基于连接表的双向一对一关联</emphasis>极为罕见，但也是可行的。"

#. Tag: programlisting
#: association_mapping.xml:232
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <join table=\"PersonAddress\" \n"
"        optional=\"true\">\n"
"        <key column=\"personId\" \n"
"            unique=\"true\"/>\n"
"        <many-to-one name=\"address\"\n"
"            column=\"addressId\" \n"
"            not-null=\"true\"\n"
"            unique=\"true\"/>\n"
"    </join>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <join table=\"PersonAddress\" \n"
"        optional=\"true\"\n"
"        inverse=\"true\">\n"
"        <key column=\"addressId\" \n"
"            unique=\"true\"/>\n"
"        <many-to-one name=\"person\"\n"
"            column=\"personId\" \n"
"            not-null=\"true\"\n"
"            unique=\"true\"/>\n"
"    </join>\n"
"</class>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:240
#, no-c-format
msgid ""
"Finally, we have a <emphasis>bidirectional many-to-many association</"
"emphasis>."
msgstr "最后，还有 <emphasis>双向多对多关联</emphasis>."

#. Tag: programlisting
#: association_mapping.xml:244
#, no-c-format
msgid ""
"<![CDATA[<class name=\"Person\">\n"
"    <id name=\"id\" column=\"personId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <set name=\"addresses\" table=\"PersonAddress\">\n"
"        <key column=\"personId\"/>\n"
"        <many-to-many column=\"addressId\"\n"
"            class=\"Address\"/>\n"
"    </set>\n"
"</class>\n"
"\n"
"<class name=\"Address\">\n"
"    <id name=\"id\" column=\"addressId\">\n"
"        <generator class=\"native\"/>\n"
"    </id>\n"
"    <set name=\"people\" inverse=\"true\" table=\"PersonAddress\">\n"
"        <key column=\"addressId\"/>\n"
"        <many-to-many column=\"personId\"\n"
"            class=\"Person\"/>\n"
"    </set>\n"
"</class>]]>"
msgstr ""

#. Tag: title
#: association_mapping.xml:253
#, no-c-format
msgid "More complex association mappings"
msgstr "更复杂的关联映射"

#. Tag: para
#: association_mapping.xml:255
#, no-c-format
msgid ""
"More complex association joins are <emphasis>extremely</emphasis> rare. "
"Hibernate makes it possible to handle more complex situations using SQL "
"fragments embedded in the mapping document. For example, if a table with "
"historical account information data defines <literal>accountNumber</"
"literal>, <literal>effectiveEndDate</literal> and "
"<literal>effectiveStartDate</literal>columns, mapped as follows:"
msgstr ""
"更复杂的关联连接<emphasis>极为</emphasis>罕见。 通过在映射文档中嵌入SQL片断，"
"Hibernate也可以处理更为复杂的情况。比如，假若包含历史帐户数据的表定义了"
"<literal>accountNumber</literal>, <literal>effectiveEndDate</literal> 和"
"<literal>effectiveStartDate</literal>字段，按照下面映射："

#. Tag: programlisting
#: association_mapping.xml:264
#, no-c-format
msgid ""
"<![CDATA[<properties name=\"currentAccountKey\">\n"
"    <property name=\"accountNumber\" type=\"string\" not-null=\"true\"/>\n"
"    <property name=\"currentAccount\" type=\"boolean\">\n"
"        <formula>case when effectiveEndDate is null then 1 else 0 end</"
"formula>\n"
"    </property>\n"
"</properties>\n"
"<property name=\"effectiveEndDate\" type=\"date\"/>\n"
"<property name=\"effectiveStateDate\" type=\"date\" not-null=\"true\"/>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:266
#, no-c-format
msgid ""
"Then we can map an association to the <emphasis>current</emphasis> instance "
"(the one with null <literal>effectiveEndDate</literal>) using:"
msgstr ""
"那么我们可以对<emphasis>目前(current)</emphasis>实例(其"
"<literal>effectiveEndDate</literal>为null)使用这样的关联映射:"

#. Tag: programlisting
#: association_mapping.xml:271
#, no-c-format
msgid ""
"<![CDATA[<many-to-one name=\"currentAccountInfo\" \n"
"        property-ref=\"currentAccountKey\"\n"
"        class=\"AccountInfo\">\n"
"    <column name=\"accountNumber\"/>\n"
"    <formula>'1'</formula>\n"
"</many-to-one>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:273
#, no-c-format
msgid ""
"In a more complex example, imagine that the association between "
"<literal>Employee</literal> and <literal>Organization</literal> is "
"maintained in an <literal>Employment</literal> table full of historical "
"employment data. Then an association to the employee's <emphasis>most "
"recent</emphasis> employer (the one with the most recent <literal>startDate</"
"literal>) might be mapped this way:"
msgstr ""
"更复杂的例子,假想<literal>Employee</literal>和<literal>Organization</literal>"
"之间的关联是通过一个<literal>Employment</literal>中间表维护的,而中间表中填充"
"了很多历史雇员数据。那“雇员的<emphasis>最新</emphasis>雇主”这个关联（最新雇主"
"就是<literal>startDate</literal>最后的那个）可以这样映射："

#. Tag: programlisting
#: association_mapping.xml:281
#, no-c-format
msgid ""
"<![CDATA[<join>\n"
"    <key column=\"employeeId\"/>\n"
"    <subselect>\n"
"        select employeeId, orgId \n"
"        from Employments \n"
"        group by orgId \n"
"        having startDate = max(startDate)\n"
"    </subselect>\n"
"    <many-to-one name=\"mostRecentEmployer\" \n"
"            class=\"Organization\" \n"
"            column=\"orgId\"/>\n"
"</join>]]>"
msgstr ""

#. Tag: para
#: association_mapping.xml:283
#, no-c-format
msgid ""
"You can get quite creative with this functionality, but it is usually more "
"practical to handle these kinds of cases using HQL or a criteria query."
msgstr ""
"使用这一功能时可以充满创意，但通常更加实用的是用HQL或条件查询来处理这些情形。"