example_mappings.po

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msgid ""
msgstr ""
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#. Tag: title
#: example_mappings.xml:20
#, no-c-format
msgid "Example: Various Mappings"
msgstr "示例：复杂映射实例"

#. Tag: para
#: example_mappings.xml:22
#, no-c-format
msgid "This chapters shows off some more complex association mappings."
msgstr "本章展示了一些较为复杂的关系映射。"

#. Tag: title
#: example_mappings.xml:27
#, no-c-format
msgid "Employer/Employee"
msgstr "Employer（雇主)/Employee(雇员)"

#. Tag: para
#: example_mappings.xml:29
#, no-c-format
msgid ""
"The following model of the relationship between <literal>Employer</literal> "
"and <literal>Employee</literal> uses an actual entity class "
"(<literal>Employment</literal>) to represent the association. This is done "
"because there might be more than one period of employment for the same two "
"parties. Components are used to model monetary values and employee names."
msgstr ""
"下面关于<literal>Employer</literal> 和 <literal>Employee</literal>的关系模型"
"使用了一个真实的实体类 (<literal>Employment</literal>)来表述，这是因为对于相"
"同的雇员和雇主可能会有多个雇佣时间段。 对于金额和雇员姓名，用Components建模。"

#. Tag: para
#: example_mappings.xml:46
#, no-c-format
msgid "Heres a possible mapping document:"
msgstr "映射文件可能是这样:"

#. Tag: programlisting
#: example_mappings.xml:50
#, no-c-format
msgid ""
"<![CDATA[<hibernate-mapping>\n"
"        \n"
"    <class name=\"Employer\" table=\"employers\">\n"
"        <id name=\"id\">\n"
"            <generator class=\"sequence\">\n"
"                <param name=\"sequence\">employer_id_seq</param>\n"
"            </generator>\n"
"        </id>\n"
"        <property name=\"name\"/>\n"
"    </class>\n"
"\n"
"    <class name=\"Employment\" table=\"employment_periods\">\n"
"\n"
"        <id name=\"id\">\n"
"            <generator class=\"sequence\">\n"
"                <param name=\"sequence\">employment_id_seq</param>\n"
"            </generator>\n"
"        </id>\n"
"        <property name=\"startDate\" column=\"start_date\"/>\n"
"        <property name=\"endDate\" column=\"end_date\"/>\n"
"\n"
"        <component name=\"hourlyRate\" class=\"MonetaryAmount\">\n"
"            <property name=\"amount\">\n"
"                <column name=\"hourly_rate\" sql-type=\"NUMERIC(12, 2)\"/>\n"
"            </property>\n"
"            <property name=\"currency\" length=\"12\"/>\n"
"        </component>\n"
"\n"
"        <many-to-one name=\"employer\" column=\"employer_id\" not-null=\"true"
"\"/>\n"
"        <many-to-one name=\"employee\" column=\"employee_id\" not-null=\"true"
"\"/>\n"
"\n"
"    </class>\n"
"\n"
"    <class name=\"Employee\" table=\"employees\">\n"
"        <id name=\"id\">\n"
"            <generator class=\"sequence\">\n"
"                <param name=\"sequence\">employee_id_seq</param>\n"
"            </generator>\n"
"        </id>\n"
"        <property name=\"taxfileNumber\"/>\n"
"        <component name=\"name\" class=\"Name\">\n"
"            <property name=\"firstName\"/>\n"
"            <property name=\"initial\"/>\n"
"            <property name=\"lastName\"/>\n"
"        </component>\n"
"    </class>\n"
"\n"
"</hibernate-mapping>]]>"
msgstr ""

#. Tag: para
#: example_mappings.xml:52
#, no-c-format
msgid ""
"And heres the table schema generated by <literal>SchemaExport</literal>."
msgstr "用<literal>SchemaExport</literal>生成表结构。"

#. Tag: programlisting
#: example_mappings.xml:56
#, no-c-format
msgid ""
"<![CDATA[create table employers (\n"
"    id BIGINT not null, \n"
"    name VARCHAR(255), \n"
"    primary key (id)\n"
")\n"
"\n"
"create table employment_periods (\n"
"    id BIGINT not null,\n"
"    hourly_rate NUMERIC(12, 2),\n"
"    currency VARCHAR(12), \n"
"    employee_id BIGINT not null, \n"
"    employer_id BIGINT not null, \n"
"    end_date TIMESTAMP, \n"
"    start_date TIMESTAMP, \n"
"    primary key (id)\n"
")\n"
"\n"
"create table employees (\n"
"    id BIGINT not null, \n"
"    firstName VARCHAR(255), \n"
"    initial CHAR(1), \n"
"    lastName VARCHAR(255), \n"
"    taxfileNumber VARCHAR(255), \n"
"    primary key (id)\n"
")\n"
"\n"
"alter table employment_periods \n"
"    add constraint employment_periodsFK0 foreign key (employer_id) "
"references employers\n"
"alter table employment_periods \n"
"    add constraint employment_periodsFK1 foreign key (employee_id) "
"references employees\n"
"create sequence employee_id_seq\n"
"create sequence employment_id_seq\n"
"create sequence employer_id_seq]]>"
msgstr ""

#. Tag: title
#: example_mappings.xml:61
#, no-c-format
msgid "Author/Work"
msgstr "Author(作家)/Work(作品)"

#. Tag: para
#: example_mappings.xml:63
#, no-c-format
msgid ""
"Consider the following model of the relationships between <literal>Work</"
"literal>, <literal>Author</literal> and <literal>Person</literal>. We "
"represent the relationship between <literal>Work</literal> and "
"<literal>Author</literal> as a many-to-many association. We choose to "
"represent the relationship between <literal>Author</literal> and "
"<literal>Person</literal> as one-to-one association. Another possibility "
"would be to have <literal>Author</literal> extend <literal>Person</literal>."
msgstr ""
"考虑下面的<literal>Work</literal>,<literal>Author</literal> 和 "
"<literal>Person</literal>模型的关系。 我们用多对多关系来描述<literal>Work</"
"literal> 和 <literal>Author</literal>， 用一对一关系来描述<literal>Author</"
"literal> 和 <literal>Person</literal>， 另一种可能性是<literal>Author</"
"literal>继承<literal>Person</literal>。"

#. Tag: para
#: example_mappings.xml:81
#, no-c-format
msgid ""
"The following mapping document correctly represents these relationships:"
msgstr "下面的映射文件正确的描述了这些关系："

#. Tag: programlisting
#: example_mappings.xml:85
#, no-c-format
msgid ""
"<![CDATA[<hibernate-mapping>\n"
"\n"
"    <class name=\"Work\" table=\"works\" discriminator-value=\"W\">\n"
"\n"
"        <id name=\"id\" column=\"id\">\n"
"            <generator class=\"native\"/>\n"
"        </id>\n"
"        <discriminator column=\"type\" type=\"character\"/>\n"
"\n"
"        <property name=\"title\"/>\n"
"        <set name=\"authors\" table=\"author_work\">\n"
"            <key column name=\"work_id\"/>\n"
"            <many-to-many class=\"Author\" column name=\"author_id\"/>\n"
"        </set>\n"
"\n"
"        <subclass name=\"Book\" discriminator-value=\"B\">\n"
"            <property name=\"text\"/>\n"
"        </subclass>\n"
"\n"
"        <subclass name=\"Song\" discriminator-value=\"S\">\n"
"            <property name=\"tempo\"/>\n"
"            <property name=\"genre\"/>\n"
"        </subclass>\n"
"\n"
"    </class>\n"
"\n"
"    <class name=\"Author\" table=\"authors\">\n"
"\n"
"        <id name=\"id\" column=\"id\">\n"
"            <!-- The Author must have the same identifier as the Person -->\n"
"            <generator class=\"assigned\"/> \n"
"        </id>\n"
"\n"
"        <property name=\"alias\"/>\n"
"        <one-to-one name=\"person\" constrained=\"true\"/>\n"
"\n"
"        <set name=\"works\" table=\"author_work\" inverse=\"true\">\n"
"            <key column=\"author_id\"/>\n"
"            <many-to-many class=\"Work\" column=\"work_id\"/>\n"
"        </set>\n"
"\n"
"    </class>\n"
"\n"
"    <class name=\"Person\" table=\"persons\">\n"
"        <id name=\"id\" column=\"id\">\n"
"            <generator class=\"native\"/>\n"
"        </id>\n"
"        <property name=\"name\"/>\n"
"    </class>\n"
"\n"
"</hibernate-mapping>]]>"
msgstr ""

#. Tag: para
#: example_mappings.xml:87
#, no-c-format
msgid ""
"There are four tables in this mapping. <literal>works</literal>, "
"<literal>authors</literal> and <literal>persons</literal> hold work, author "
"and person data respectively. <literal>author_work</literal> is an "
"association table linking authors to works. Heres the table schema, as "
"generated by <literal>SchemaExport</literal>."
msgstr ""
"映射中有4个表。<literal>works</literal>, <literal>authors</literal> 和 "
"<literal>persons</literal> 分别保存着work，author和person的数据。"
"<literal>author_work</literal>是authors和works的关联表。 表结构是由"
"<literal>SchemaExport</literal>生成的。"

#. Tag: programlisting
#: example_mappings.xml:95
#, no-c-format
msgid ""
"<![CDATA[create table works (\n"
"    id BIGINT not null generated by default as identity, \n"
"    tempo FLOAT, \n"
"    genre VARCHAR(255), \n"
"    text INTEGER, \n"
"    title VARCHAR(255), \n"
"    type CHAR(1) not null, \n"
"    primary key (id)\n"
")\n"
"\n"
"create table author_work (\n"
"    author_id BIGINT not null, \n"
"    work_id BIGINT not null, \n"
"    primary key (work_id, author_id)\n"
")\n"
"\n"
"create table authors (\n"
"    id BIGINT not null generated by default as identity, \n"
"    alias VARCHAR(255), \n"
"    primary key (id)\n"
")\n"
"\n"
"create table persons (\n"
"    id BIGINT not null generated by default as identity, \n"
"    name VARCHAR(255), \n"
"    primary key (id)\n"
")\n"
"\n"
"alter table authors \n"
"    add constraint authorsFK0 foreign key (id) references persons\n"
"alter table author_work \n"
"    add constraint author_workFK0 foreign key (author_id) references "
"authors\n"
"alter table author_work\n"
"    add constraint author_workFK1 foreign key (work_id) references works]]>"
msgstr ""

#. Tag: title
#: example_mappings.xml:100
#, no-c-format
msgid "Customer/Order/Product"
msgstr "Customer(客户)/Order(订单)/Product(产品)"

#. Tag: para
#: example_mappings.xml:102
#, no-c-format
msgid ""
"Now consider a model of the relationships between <literal>Customer</"
"literal>, <literal>Order</literal> and <literal>LineItem</literal> and "
"<literal>Product</literal>. There is a one-to-many association between "
"<literal>Customer</literal> and <literal>Order</literal>, but how should we "
"represent <literal>Order</literal> / <literal>LineItem</literal> / "
"<literal>Product</literal>? I've chosen to map <literal>LineItem</literal> "
"as an association class representing the many-to-many association between "
"<literal>Order</literal> and <literal>Product</literal>. In Hibernate, this "
"is called a composite element."
msgstr ""
"现在来考虑<literal>Customer</literal>,<literal>Order</literal> ， "
"<literal>LineItem</literal> 和 <literal>Product</literal>关系的模型。"
"<literal>Customer</literal> 和 <literal>Order</literal>之间 是一对多的关系，"
"但是我们怎么来描述<literal>Order</literal> / <literal>LineItem</literal> / "
"<literal>Product</literal>呢？ 我可以把<literal>LineItem</literal>作为描述"
"<literal>Order</literal> 和 <literal>Product</literal> 多对多关系的关联类，在"
"Hibernate，这叫做组合元素。"

#. Tag: para
#: example_mappings.xml:122
#, no-c-format
msgid "The mapping document:"
msgstr "映射文件如下："

#. Tag: programlisting
#: example_mappings.xml:126
#, no-c-format
msgid ""
"<![CDATA[<hibernate-mapping>\n"
"\n"
"    <class name=\"Customer\" table=\"customers\">\n"
"        <id name=\"id\">\n"
"            <generator class=\"native\"/>\n"
"        </id>\n"
"        <property name=\"name\"/>\n"
"        <set name=\"orders\" inverse=\"true\">\n"
"            <key column=\"customer_id\"/>\n"
"            <one-to-many class=\"Order\"/>\n"
"        </set>\n"
"    </class>\n"
"\n"
"    <class name=\"Order\" table=\"orders\">\n"
"        <id name=\"id\">\n"
"            <generator class=\"native\"/>\n"
"        </id>\n"
"        <property name=\"date\"/>\n"
"        <many-to-one name=\"customer\" column=\"customer_id\"/>\n"
"        <list name=\"lineItems\" table=\"line_items\">\n"
"            <key column=\"order_id\"/>\n"
"            <list-index column=\"line_number\"/>\n"
"            <composite-element class=\"LineItem\">\n"
"                <property name=\"quantity\"/>\n"
"                <many-to-one name=\"product\" column=\"product_id\"/>\n"
"            </composite-element>\n"
"        </list>\n"
"    </class>\n"
"\n"
"    <class name=\"Product\" table=\"products\">\n"
"        <id name=\"id\">\n"
"            <generator class=\"native\"/>\n"
"        </id>\n"
"        <property name=\"serialNumber\"/>\n"
"    </class>\n"
"\n"
"</hibernate-mapping>]]>"
msgstr ""

#. Tag: para
#: example_mappings.xml:128
#, no-c-format
msgid ""
"<literal>customers</literal>, <literal>orders</literal>, "
"<literal>line_items</literal> and <literal>products</literal> hold customer, "
"order, order line item and product data respectively. <literal>line_items</"
"literal> also acts as an association table linking orders with products."
msgstr ""
"<literal>customers</literal>, <literal>orders</literal>, "
"<literal>line_items</literal> 和 <literal>products</literal> 分别保存着"
"customer, order, order line item 和 product的数据。 <literal>line_items</"
"literal>也作为连接orders 和 products的关联表。"

#. Tag: programlisting
#: example_mappings.xml:135
#, no-c-format
msgid ""