basic_mapping.po

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

msgid ""
"a specialized sequence generation strategy which utilizes a database "
"sequence for the actual value generation, but combines this with JDBC3 "
"getGeneratedKeys to actually return the generated identifier value as part "
"of the insert statement execution. This strategy is only known to be "
"supported on Oracle 10g drivers targetted for JDK 1.4. Note comments on "
"these insert statements are disabled due to a bug in the Oracle drivers."
msgstr ""
"一种特别的序列生成策略,使用数据库序列来生成实际值,但将它和JDBC3的"
"getGeneratedKeys结合在一起,使得在插入语句执行的时候就返回生成的值。目前为止只"
"有面向JDK 1.4的Oracle 10g驱动支持这一策略。注意，因为Oracle驱动程序的一个"
"bug，这些插入语句的注释被关闭了。（原文：Note comments on these insert "
"statements are disabled due to a bug in the Oracle drivers.）"

#. Tag: title
#: basic_mapping.xml:703
#, no-c-format
msgid "Hi/lo algorithm"
msgstr "高/低位算法（Hi/Lo Algorithm）"

#. Tag: para
#: basic_mapping.xml:704
#, no-c-format
msgid ""
"The <literal>hilo</literal> and <literal>seqhilo</literal> generators "
"provide two alternate implementations of the hi/lo algorithm, a favorite "
"approach to identifier generation. The first implementation requires a "
"\"special\" database table to hold the next available \"hi\" value. The "
"second uses an Oracle-style sequence (where supported)."
msgstr ""
"<literal>hilo</literal> 和 <literal>seqhilo</literal>生成器给出了两种hi/lo算"
"法的实现， 这是一种很令人满意的标识符生成算法。第一种实现需要一个“特殊”的数据"
"库表来保存下一个可用的“hi”值。 第二种实现使用一个Oracle风格的序列（在被支持的"
"情况下）。"

#. Tag: programlisting
#: basic_mapping.xml:711
#, no-c-format
msgid ""
"<![CDATA[<id name=\"id\" type=\"long\" column=\"cat_id\">\n"
"        <generator class=\"hilo\">\n"
"                <param name=\"table\">hi_value</param>\n"
"                <param name=\"column\">next_value</param>\n"
"                <param name=\"max_lo\">100</param>\n"
"        </generator>\n"
"</id>]]>"
msgstr ""

#. Tag: programlisting
#: basic_mapping.xml:713
#, no-c-format
msgid ""
"<![CDATA[<id name=\"id\" type=\"long\" column=\"cat_id\">\n"
"        <generator class=\"seqhilo\">\n"
"                <param name=\"sequence\">hi_value</param>\n"
"                <param name=\"max_lo\">100</param>\n"
"        </generator>\n"
"</id>]]>"
msgstr ""

#. Tag: para
#: basic_mapping.xml:715
#, no-c-format
msgid ""
"Unfortunately, you can't use <literal>hilo</literal> when supplying your own "
"<literal>Connection</literal> to Hibernate. When Hibernate is using an "
"application server datasource to obtain connections enlisted with JTA, you "
"must properly configure the <literal>hibernate.transaction."
"manager_lookup_class</literal>."
msgstr ""
"很不幸，你在为Hibernate自行提供<literal>Connection</literal>时无法使用"
"<literal>hilo</literal>。 当Hibernate使用JTA获取应用服务器的数据源连接时,你必"
"须正确地配置 <literal>hibernate.transaction.manager_lookup_class</literal>。"

#. Tag: title
#: basic_mapping.xml:724
#, no-c-format
msgid "UUID algorithm"
msgstr "UUID算法（UUID Algorithm ）"

#. Tag: para
#: basic_mapping.xml:725
#, no-c-format
msgid ""
"The UUID contains: IP address, startup time of the JVM (accurate to a "
"quarter second), system time and a counter value (unique within the JVM). "
"It's not possible to obtain a MAC address or memory address from Java code, "
"so this is the best we can do without using JNI."
msgstr ""
"UUID包含：IP地址，JVM的启动时间（精确到1/4秒），系统时间和一个计数器值（在JVM"
"中唯一）。 在Java代码中不可能获得MAC地址或者内存地址，所以这已经是我们在不使"
"用JNI的前提下的能做的最好实现了。"

#. Tag: title
#: basic_mapping.xml:734
#, no-c-format
msgid "Identity columns and sequences"
msgstr "标识字段和序列（Identity columns and Sequences）"

#. Tag: para
#: basic_mapping.xml:735
#, no-c-format
msgid ""
"For databases which support identity columns (DB2, MySQL, Sybase, MS SQL), "
"you may use <literal>identity</literal> key generation. For databases that "
"support sequences (DB2, Oracle, PostgreSQL, Interbase, McKoi, SAP DB) you "
"may use <literal>sequence</literal> style key generation. Both these "
"strategies require two SQL queries to insert a new object."
msgstr ""
"对于内部支持标识字段的数据库(DB2,MySQL,Sybase,MS SQL)，你可以使用"
"<literal>identity</literal>关键字生成。 对于内部支持序列的数据库（DB2,"
"Oracle, PostgreSQL, Interbase, McKoi,SAP DB), 你可以使用<literal>sequence</"
"literal>风格的关键字生成。 这两种方式对于插入一个新的对象都需要两次SQL查询。"

#. Tag: programlisting
#: basic_mapping.xml:743
#, no-c-format
msgid ""
"<![CDATA[<id name=\"id\" type=\"long\" column=\"person_id\">\n"
"        <generator class=\"sequence\">\n"
"                <param name=\"sequence\">person_id_sequence</param>\n"
"        </generator>\n"
"</id>]]>"
msgstr ""

#. Tag: programlisting
#: basic_mapping.xml:745
#, no-c-format
msgid ""
"<![CDATA[<id name=\"id\" type=\"long\" column=\"person_id\" unsaved-value=\"0"
"\">\n"
"        <generator class=\"identity\"/>\n"
"</id>]]>"
msgstr ""

#. Tag: para
#: basic_mapping.xml:747
#, no-c-format
msgid ""
"For cross-platform development, the <literal>native</literal> strategy will "
"choose from the <literal>identity</literal>, <literal>sequence</literal> and "
"<literal>hilo</literal> strategies, dependant upon the capabilities of the "
"underlying database."
msgstr ""
"对于跨平台开发，<literal>native</literal>策略会从<literal>identity</"
"literal>, <literal>sequence</literal> 和<literal>hilo</literal>中进行选择，选"
"择哪一个，这取决于底层数据库的支持能力。"

#. Tag: title
#: basic_mapping.xml:756
#, no-c-format
msgid "Assigned identifiers"
msgstr "程序分配的标识符（Assigned Identifiers）"

#. Tag: para
#: basic_mapping.xml:757
#, no-c-format
msgid ""
"If you want the application to assign identifiers (as opposed to having "
"Hibernate generate them), you may use the <literal>assigned</literal> "
"generator. This special generator will use the identifier value already "
"assigned to the object's identifier property. This generator is used when "
"the primary key is a natural key instead of a surrogate key. This is the "
"default behavior if you do no specify a <literal>&lt;generator&gt;</literal> "
"element."
msgstr ""
"如果你需要应用程序分配一个标示符（而非Hibernate来生成），你可以使用"
"<literal>assigned</literal> 生成器。这种特殊的生成器会使用已经分配给对象的标"
"识符属性的标识符值。 这个生成器使用一个自然键（natural key，有商业意义的列－"
"译注）作为主键，而不是使用一个代理键（ surrogate key，没有商业意义的列－译"
"注）。这是没有指定<literal>&lt;generator&gt;</literal>元素时的默认行为"

#. Tag: para
#: basic_mapping.xml:766
#, no-c-format
msgid ""
"Choosing the <literal>assigned</literal> generator makes Hibernate use "
"<literal>unsaved-value=\"undefined\"</literal>, forcing Hibernate to go to "
"the database to determine if an instance is transient or detached, unless "
"there is a version or timestamp property, or you define <literal>Interceptor."
"isUnsaved()</literal>."
msgstr ""
"当选择<literal>assigned</literal>生成器时，除非有一个version或timestamp属性，"
"或者你定义了 <literal>Interceptor.isUnsaved()</literal>，否则需要让Hiberante"
"使用 <literal>unsaved-value=\"undefined\"</literal>，强制Hibernatet查询数据库"
"来确定一个实例是瞬时的（transient） 还是脱管的（detached）。"

#. Tag: title
#: basic_mapping.xml:776
#, no-c-format
msgid "Primary keys assigned by triggers"
msgstr "触发器实现的主键生成器（Primary keys assigned by triggers）"

#. Tag: para
#: basic_mapping.xml:777
#, no-c-format
msgid ""
"For legacy schemas only (Hibernate does not generate DDL with triggers)."
msgstr "仅仅用于遗留的schema中 (Hibernate不能使用触发器生成DDL)。"

#. Tag: programlisting
#: basic_mapping.xml:781
#, no-c-format
msgid ""
"<![CDATA[<id name=\"id\" type=\"long\" column=\"person_id\">\n"
"        <generator class=\"select\">\n"
"                <param name=\"key\">socialSecurityNumber</param>\n"
"        </generator>\n"
"</id>]]>"
msgstr ""

#. Tag: para
#: basic_mapping.xml:783
#, no-c-format
msgid ""
"In the above example, there is a unique valued property named "
"<literal>socialSecurityNumber</literal> defined by the class, as a natural "
"key, and a surrogate key named <literal>person_id</literal> whose value is "
"generated by a trigger."
msgstr ""
"在上面的例子中，类定义了一个命名为<literal>socialSecurityNumber</literal>的唯"
"一值属性， 它是一个自然键（natural key），命名为<literal>person_id</literal>"
"的代理键（surrogate key） 的值由触发器生成。"

#. Tag: title
#: basic_mapping.xml:795
#, no-c-format
msgid "Enhanced identifier generators"
msgstr "Enhanced identifier generators"

#. Tag: para
#: basic_mapping.xml:797
#, no-c-format
msgid ""
"Starting with release 3.2.3, there are 2 new generators which represent a re-"
"thinking of 2 different aspects of identifier generation. The first aspect "
"is database portability; the second is optimization (not having to query the "
"database for every request for a new identifier value). These two new "
"generators are intended to take the place of some of the named generators "
"described above (starting in 3.3.x); however, they are included in the "
"current releases and can be referenced by FQN."
msgstr ""
"Starting with release 3.2.3, there are 2 new generators which represent a re-"
"thinking of 2 different aspects of identifier generation. The first aspect "
"is database portability; the second is optimization (not having to query the "
"database for every request for a new identifier value). These two new "
"generators are intended to take the place of some of the named generators "
"described above (starting in 3.3.x); however, they are included in the "
"current releases and can be referenced by FQN."

#. Tag: para
#: basic_mapping.xml:805
#, fuzzy, no-c-format
msgid ""
"The first of these new generators is <literal>org.hibernate.id.enhanced."
"SequenceStyleGenerator</literal> which is intended firstly as a replacement "
"for the <literal>sequence</literal> generator and secondly as a better "
"portability generator than <literal>native</literal> (because "
"<literal>native</literal> (generally) chooses between <literal>identity</"
"literal> and <literal>sequence</literal> which have largely different "
"semantics which can cause subtle isssues in applications eyeing "
"portability). <literal>org.hibernate.id.enhanced.SequenceStyleGenerator</"
"literal> however achieves portability in a different manner. It chooses "
"between using a table or a sequence in the database to store its "
"incrementing values depending on the capabilities of the dialect being used. "
"The difference between this and <literal>native</literal> is that table-"
"based and sequence-based storage have the same exact semantic (in fact "
"sequences are exactly what Hibernate tries to emmulate with its table-based "
"generators). This generator has a number of configuration parameters:"
msgstr ""
"The first of these new generators is <literal>org.hibernate.id.enhanced."
"SequenceStyleGenerator</literal> which is intended firstly as a replacement "
"for the <literal>sequence</literal> generator and secondly as a better "
"portability generator than <literal>native</literal> (because "
"<literal>native</literal> (generally) chooses between <literal>identity</"
"literal> and <literal>sequence</literal> which have largely different "
"semantics which can cause subtle isssues in applications eyeing "
"portability). <literal>org.hibernate.id.enhanced.SequenceStyleGenerator</"
"literal> however achieves portability in a different manner. It chooses "
"between using a table or a sequence in the database to store its "
"incrementing values depending on the capabilities of the dialect being used. "
"The difference between this and <literal>native</literal> is that table-"
"based and sequence-based storage have the same exact semantic (in fact "
"sequences are exactly what Hibernate tries to emmulate with its table-based "
"generators). This generator has a number of configuration parameters: "
"<placeholder-1/>"

#. Tag: para
#: basic_mapping.xml:819
#, no-c-format
msgid ""
"<literal>sequence_name</literal> (optional, defaults to "
"<literal>hibernate_sequence</literal>): The name of the sequence (or table) "
"to be used."
msgstr ""
"<literal>sequence_name</literal> (optional, defaults to "
"<literal>hibernate_sequence</literal>): The name of the sequence (or table) "
"to be used."

#. Tag: para
#: basic_mapping.xml:825
#, no-c-format
msgid ""
"<literal>initial_value</literal> (optional, defaults to <literal>1</"
"literal>): The initial value to be retrieved from the sequence/table. In "
"sequence creation terms, this is analogous to the clause typical named "
"\"STARTS WITH\"."
msgstr ""
"<literal>initial_value</literal> (optional, defaults to <literal>1</"
"literal>): The initial value to be retrieved from the sequence/table. In "
"sequence creation terms, this is analogous to the clause typical named "
"\"STARTS WITH\"."

#. Tag: para
#: basic_mapping.xml:832
#, no-c-format
msgid ""
"<literal>increment_size</literal> (optional, defaults to <literal>1</"
"literal>): The value by which subsequent calls to the sequence/table should "
"differ. In