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update textsearch.sgml-200701
——row1019至1021，调英为： to hold the output of <function>to_tsvector</function>. To keep this column automatically up to date with its source data, use a stored generated column. This example is a ——row1050，调翻为： 另一种方法是创建一个单独的<type>tsvector</type>列来保存<function>to_tsvector</function>的输出。若要使此列与其源数据保持自动更新，用存储生成的列。这个例子是<literal>title</literal>和<literal>body</literal>的连接，使用<function>coalesce</function>来保证当其他域为<literal>NULL</literal>时一个域仍然能留在索引中： ——row1027至1029，调英为： ALTER TABLE pgweb ADD COLUMN textsearchable_index_col tsvector GENERATED ALWAYS AS (to_tsvector('english', coalesce(title, '') || ' ' || coalesce(body, ''))) STORED; ——row1053至1055，调翻为： ALTER TABLE pgweb ADD COLUMN textsearchable_index_col tsvector GENERATED ALWAYS AS (to_tsvector('english', coalesce(title, '') || ' ' || coalesce(body, ''))) STORED; ——row1074，删英和翻为： <!--==========================orignal english content========================== <para> When using a separate column to store the <type>tsvector</type> representation, it is necessary to create a trigger to keep the <type>tsvector</type> column current anytime <literal>title</literal> or <literal>body</literal> changes. <xref linkend="textsearch-update-triggers"/> explains how to do that. </para> ____________________________________________________________________________--> <para> 在使用一个单独的列来存储<type>tsvector</type>表示时，有必要创建一个触发器在<literal>title</literal>或<literal>body</literal>改变时保证<type>tsvector</type>列为当前值。<xref linkend="textsearch-update-triggers"/>解释了怎样去做。 </para> ——row3151至3162，增英和翻为： <note> <!--==========================orignal english content========================== <para> The method described in this section has been obsoleted by the use of stored generated columns, as described in <xref linkend="textsearch-tables-index"/>. </para> ____________________________________________________________________________--> <para> 本节中描述的方法已被使用存储生成的列所淘汰，如 <xref linkend="textsearch-tables-index"/>中所述。 </para> </note> ——row6497至6506，增英和翻为： <!--==========================orignal english content========================== <para> A GiST index can be covering, i.e. use the <literal>INCLUDE</literal> clause. Included columns can have data types without any GiST operator class. Included attributes will be stored uncompressed. </para> ____________________________________________________________________________--> <para> GiST 索引可以被覆盖，例如使用<literal>INCLUDE</literal>子句。 包含的列可以具有没有任何 GiST 操作符类的数据类型。 包含的属性将非压缩存储。 </para> ——row6722至6746，调英为： List of text search dictionaries Schema | Name | Description -&minus;-&minus;-&minus;-&minus;-&minus;-&minus;+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;- pg_catalog | arabic_stem | snowball stemmer for arabic language pg_catalog | danish_stem | snowball stemmer for danish language pg_catalog | dutch_stem | snowball stemmer for dutch language pg_catalog | english_stem | snowball stemmer for english language pg_catalog | finnish_stem | snowball stemmer for finnish language pg_catalog | french_stem | snowball stemmer for french language pg_catalog | german_stem | snowball stemmer for german language pg_catalog | hungarian_stem | snowball stemmer for hungarian language pg_catalog | indonesian_stem | snowball stemmer for indonesian language pg_catalog | irish_stem | snowball stemmer for irish language pg_catalog | italian_stem | snowball stemmer for italian language pg_catalog | lithuanian_stem | snowball stemmer for lithuanian language pg_catalog | nepali_stem | snowball stemmer for nepali language pg_catalog | norwegian_stem | snowball stemmer for norwegian language pg_catalog | portuguese_stem | snowball stemmer for portuguese language pg_catalog | romanian_stem | snowball stemmer for romanian language pg_catalog | russian_stem | snowball stemmer for russian language pg_catalog | simple | simple dictionary: just lower case and check for stopword pg_catalog | spanish_stem | snowball stemmer for spanish language pg_catalog | swedish_stem | snowball stemmer for swedish language pg_catalog | tamil_stem | snowball stemmer for tamil language pg_catalog | turkish_stem | snowball stemmer for turkish language ——row6754至6778，调翻为： List of text search dictionaries Schema | Name | Description -&minus;-&minus;-&minus;-&minus;-&minus;-&minus;+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;- pg_catalog | arabic_stem | snowball stemmer for arabic language pg_catalog | danish_stem | snowball stemmer for danish language pg_catalog | dutch_stem | snowball stemmer for dutch language pg_catalog | english_stem | snowball stemmer for english language pg_catalog | finnish_stem | snowball stemmer for finnish language pg_catalog | french_stem | snowball stemmer for french language pg_catalog | german_stem | snowball stemmer for german language pg_catalog | hungarian_stem | snowball stemmer for hungarian language pg_catalog | indonesian_stem | snowball stemmer for indonesian language pg_catalog | irish_stem | snowball stemmer for irish language pg_catalog | italian_stem | snowball stemmer for italian language pg_catalog | lithuanian_stem | snowball stemmer for lithuanian language pg_catalog | nepali_stem | snowball stemmer for nepali language pg_catalog | norwegian_stem | snowball stemmer for norwegian language pg_catalog | portuguese_stem | snowball stemmer for portuguese language pg_catalog | romanian_stem | snowball stemmer for romanian language pg_catalog | russian_stem | snowball stemmer for russian language pg_catalog | simple | simple dictionary: just lower case and check for stopword pg_catalog | spanish_stem | snowball stemmer for spanish language pg_catalog | swedish_stem | snowball stemmer for swedish language pg_catalog | tamil_stem | snowball stemmer for tamil language pg_catalog | turkish_stem | snowball stemmer for turkish language
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‎postgresql/doc/src/sgml/textsearch.sgml

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Original file line numberDiff line numberDiff line change
@@ -515,7 +515,7 @@ ____________________________________________________________________________-->
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<para>
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前两种我们已经见过。形式<type>text</type> <literal>@@</literal> <type>tsquery</type>等价于<literal>to_tsvector(x) @@ y</literal>。形式<type>text</type> <literal>@@</literal> <type>text</type>等价于<literal>to_tsvector(x) @@ plainto_tsquery(y)</literal>。
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</para>
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<!--==========================orignal english content==========================
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<para>
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Within a <type>tsquery</type>, the <literal>&amp;</literal> (AND) operator
@@ -1016,15 +1016,17 @@ CREATE INDEX pgweb_idx ON pgweb USING GIN(to_tsvector('english', title || ' ' ||
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<!--==========================orignal english content==========================
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<para>
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Another approach is to create a separate <type>tsvector</type> column
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to hold the output of <function>to_tsvector</function>. This example is a
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to hold the output of <function>to_tsvector</function>. To keep this
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column automatically up to date with its source data, use a stored
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generated column. This example is a
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concatenation of <literal>title</literal> and <literal>body</literal>,
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using <function>coalesce</function> to ensure that one field will still be
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indexed when the other is <literal>NULL</literal>:
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<programlisting>
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ALTER TABLE pgweb ADD COLUMN textsearchable_index_col tsvector;
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UPDATE pgweb SET textsearchable_index_col =
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to_tsvector('english', coalesce(title,'') || ' ' || coalesce(body,''));
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ALTER TABLE pgweb
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ADD COLUMN textsearchable_index_col tsvector
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GENERATED ALWAYS AS (to_tsvector('english', coalesce(title, '') || ' ' || coalesce(body, ''))) STORED;
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</programlisting>
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Then we create a <acronym>GIN</acronym> index to speed up the search:
@@ -1045,12 +1047,12 @@ LIMIT 10;
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</para>
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____________________________________________________________________________-->
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<para>
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另一种方法是创建一个单独的<type>tsvector</type>列来保存<function>to_tsvector</function>的输出。这个例子是<literal>title</literal>和<literal>body</literal>的连接，使用<function>coalesce</function>来保证当其他域为<literal>NULL</literal>时一个域仍然能留在索引中：
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另一种方法是创建一个单独的<type>tsvector</type>列来保存<function>to_tsvector</function>的输出。若要使此列与其源数据保持自动更新，用存储生成的列。这个例子是<literal>title</literal>和<literal>body</literal>的连接，使用<function>coalesce</function>来保证当其他域为<literal>NULL</literal>时一个域仍然能留在索引中：
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<programlisting>
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ALTER TABLE pgweb ADD COLUMN textsearchable_index_col tsvector;
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UPDATE pgweb SET textsearchable_index_col =
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to_tsvector('english', coalesce(title,'') || ' ' || coalesce(body,''));
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ALTER TABLE pgweb
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ADD COLUMN textsearchable_index_col tsvector
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GENERATED ALWAYS AS (to_tsvector('english', coalesce(title, '') || ' ' || coalesce(body, ''))) STORED;
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</programlisting>
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然后我们创建一个<acronym>GIN</acronym>索引来加速搜索：
@@ -1070,19 +1072,6 @@ LIMIT 10;
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</programlisting>
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</para>
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<!--==========================orignal english content==========================
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<para>
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When using a separate column to store the <type>tsvector</type>
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representation,
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it is necessary to create a trigger to keep the <type>tsvector</type>
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column current anytime <literal>title</literal> or <literal>body</literal> changes.
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<xref linkend="textsearch-update-triggers"/> explains how to do that.
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</para>
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____________________________________________________________________________-->
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<para>
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在使用一个单独的列来存储<type>tsvector</type>表示时，有必要创建一个触发器在<literal>title</literal>或<literal>body</literal>改变时保证<type>tsvector</type>列为当前值。<xref linkend="textsearch-update-triggers"/>解释了怎样去做。
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</para>
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<!--==========================orignal english content==========================
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<para>
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One advantage of the separate-column approach over an expression index
@@ -1523,7 +1512,7 @@ SELECT plainto_tsquery('english', 'The Fat &amp; Rats:C');
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这里，所有输入的标点都被作为空间符号并且丢弃。
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</para>
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<!--==========================orignal english content==========================
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<indexterm>
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<primary>phraseto_tsquery</primary>
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</varlistentry>
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</variablelist>
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<!--==========================orignal english content==========================
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<para>
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A full list of <type>tsvector</type>-related functions is available
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</listitem>
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</varlistentry>
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<varlistentry>
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<!--==========================orignal english content==========================
@@ -3159,6 +3148,19 @@ ____________________________________________________________________________-->
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<secondary>用于更新一个派生的 tsvector 列</secondary>
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</indexterm>
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<note>
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<!--==========================orignal english content==========================
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<para>
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The method described in this section has been obsoleted by the use of
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stored generated columns, as described in <xref
3156+
linkend="textsearch-tables-index"/>.
3157+
</para>
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____________________________________________________________________________-->
3159+
<para>
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本节中描述的方法已被使用存储生成的列所淘汰，如 <xref linkend="textsearch-tables-index"/>中所述。
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</para>
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</note>
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<!--==========================orignal english content==========================
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<para>
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When using a separate column to store the <type>tsvector</type> representation
@@ -5110,7 +5112,7 @@ ____________________________________________________________________________-->
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<para>
51115113
Ispell 词典通常识别一个有限集合的词，这样它们后面应该跟着另一个更广义的词典；例如，一个 Snowball 词典，它可以识别所有东西。
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</para>
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<!--==========================orignal english content==========================
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<para>
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The <filename>.affix</filename> file of <application>Ispell</application> has the following
@@ -5247,7 +5249,7 @@ SELECT ts_lexize('norwegian_ispell', 'sjokoladefabrikk');
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{sjokoladefabrikk,sjokolade,fabrikk}
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</programlisting>
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</para>
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<!--==========================orignal english content==========================
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<para>
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<application>MySpell</application> format is a subset of <application>Hunspell</application>.
@@ -6431,7 +6433,7 @@ ____________________________________________________________________________-->
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
@@ -6492,6 +6494,17 @@ ____________________________________________________________________________-->
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一个 GiST 索引是<firstterm>有损的</firstterm>，这表示索引可能产生假匹配，并且有必要检查真实的表行来消除这种假匹配（<productname>PostgreSQL</productname>在需要时会自动做这一步）。GiST 索引之所以是有损的，是因为每一个文档在索引中被表示为一个定长的签名。该签名通过哈希每一个词到一个 n 位串中的一个单一位来产生，通过将所有这些位 OR 在一起产生一个 n 位的文档签名。当两个词哈希到同一个位位置时就会产生假匹配。如果查询中所有词都有匹配（真或假），则必须检索表行查看匹配是否正确。
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</para>
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<!--==========================orignal english content==========================
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<para>
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A GiST index can be covering, i.e. use the <literal>INCLUDE</literal>
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clause. Included columns can have data types without any GiST operator
6501+
class. Included attributes will be stored uncompressed.
6502+
</para>
6503+
____________________________________________________________________________-->
6504+
<para>
6505+
GiST 索引可以被覆盖，例如使用<literal>INCLUDE</literal>子句。 包含的列可以具有没有任何 GiST 操作符类的数据类型。 包含的属性将非压缩存储。
6506+
</para>
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<!--==========================orignal english content==========================
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<para>
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Lossiness causes performance degradation due to unnecessary fetches of table
@@ -6706,24 +6719,30 @@ ____________________________________________________________________________-->
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List text search dictionaries (add <literal>+</literal> for more detail).
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<screen>
67086721
=&gt; \dFd
6709-
List of text search dictionaries
6710-
Schema | Name | Description
6722+
List of text search dictionaries
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Schema | Name | Description
67116724
-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-+-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-&minus;-
6725+
pg_catalog | arabic_stem | snowball stemmer for arabic language
67126726
pg_catalog | danish_stem | snowball stemmer for danish language
67136727
pg_catalog | dutch_stem | snowball stemmer for dutch language
67146728
pg_catalog | english_stem | snowball stemmer for english language
67156729
pg_catalog | finnish_stem | snowball stemmer for finnish language
67166730
pg_catalog | french_stem | snowball stemmer for french language
67176731
pg_catalog | german_stem | snowball stemmer for german language
67186732
pg_catalog | hungarian_stem | snowball stemmer for hungarian language
6733+
pg_catalog | indonesian_stem | snowball stemmer for indonesian language
6734+
pg_catalog | irish_stem | snowball stemmer for irish language
67196735
pg_catalog | italian_stem | snowball stemmer for italian language
6736+
pg_catalog | lithuanian_stem | snowball stemmer for lithuanian language
6737+
pg_catalog | nepali_stem | snowball stemmer for nepali language
67206738
pg_catalog | norwegian_stem | snowball stemmer for norwegian language
67216739
pg_catalog | portuguese_stem | snowball stemmer for portuguese language
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pg_catalog | romanian_stem | snowball stemmer for romanian language
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pg_catalog | russian_stem | snowball stemmer for russian language
67246742
pg_catalog | simple | simple dictionary: just lower case and check for stopword
67256743
pg_catalog | spanish_stem | snowball stemmer for spanish language
67266744
pg_catalog | swedish_stem | snowball stemmer for swedish language
6745+
pg_catalog | tamil_stem | snowball stemmer for tamil language
67276746
pg_catalog | turkish_stem | snowball stemmer for turkish language
67286747
</screen>
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</para>
@@ -6732,24 +6751,30 @@ ____________________________________________________________________________-->
67326751
列出文本搜索词典（加上<literal>+</literal>得到更多细节）。
67336752
<screen>
67346753
=&gt; \dFd
6735-
List of text search dictionaries
6736-
Schema | Name | Description
6754+
List of text search dictionaries
6755+
Schema | Name | Description
67376756
------------+-----------------+-----------------------------------------------------------
6757+
pg_catalog | arabic_stem | snowball stemmer for arabic language
67386758
pg_catalog | danish_stem | snowball stemmer for danish language
67396759
pg_catalog | dutch_stem | snowball stemmer for dutch language
67406760
pg_catalog | english_stem | snowball stemmer for english language
67416761
pg_catalog | finnish_stem | snowball stemmer for finnish language
67426762
pg_catalog | french_stem | snowball stemmer for french language
67436763
pg_catalog | german_stem | snowball stemmer for german language
67446764
pg_catalog | hungarian_stem | snowball stemmer for hungarian language
6765+
pg_catalog | indonesian_stem | snowball stemmer for indonesian language
6766+
pg_catalog | irish_stem | snowball stemmer for irish language
67456767
pg_catalog | italian_stem | snowball stemmer for italian language
6768+
pg_catalog | lithuanian_stem | snowball stemmer for lithuanian language
6769+
pg_catalog | nepali_stem | snowball stemmer for nepali language
67466770
pg_catalog | norwegian_stem | snowball stemmer for norwegian language
67476771
pg_catalog | portuguese_stem | snowball stemmer for portuguese language
67486772
pg_catalog | romanian_stem | snowball stemmer for romanian language
67496773
pg_catalog | russian_stem | snowball stemmer for russian language
67506774
pg_catalog | simple | simple dictionary: just lower case and check for stopword
67516775
pg_catalog | spanish_stem | snowball stemmer for spanish language
67526776
pg_catalog | swedish_stem | snowball stemmer for swedish language
6777+
pg_catalog | tamil_stem | snowball stemmer for tamil language
67536778
pg_catalog | turkish_stem | snowball stemmer for turkish language
67546779
</screen>
67556780
</para>

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