archived-doc-zh/reference/pgsql/functions/pg-convert.xml

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<refentry xml:id="function.pg-convert" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_convert</refname>
  <refpurpose>
   将关联的数组值转换为适合 SQL 语句的格式
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>pg_convert</methodname>
   <methodparam><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
   <methodparam><type>string</type><parameter>table_name</parameter></methodparam>
   <methodparam><type>array</type><parameter>values</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_convert</function> 检查 <literal>values</literal> 中的值并将其转换为为适用于
   SQL 语句的值。<function>pg_convert</function> 的前提条件是现有的表 <literal>table_name</literal>
   中具有的列至少有 <literal>values</literal> 中的单元那么多。<literal>table_name</literal>
   中的字段名以及字段值必须匹配 <literal>values</literal>
   中的索引，并且相应的数据类型必须兼容。成功时返回包含转换后的值的数组，否则返回 &false;。
    </para>
  <note>
   <para>
    接受 bool 值并转换为 PostgreSQL boolean 值。还支持 bool 值的字符串表示。&null;
    转换为 PostgreSQL NULL。
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &pgsql.parameter.connection;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>table_name</parameter></term>
     <listitem>
      <para>
       要转换类型的表名。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>values</parameter></term>
     <listitem>
      <para>
       要转换的数据。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       <constant>PGSQL_CONV_IGNORE_DEFAULT</constant>、<constant>PGSQL_CONV_FORCE_NULL</constant>
       或 <constant>PGSQL_CONV_IGNORE_NOT_NULL</constant> 的任意数量组合。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   转换值后的 <type>array</type>，&return.falseforfailure;。
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   当字段的值或类型不能正确匹配 PostgreSQL 的类型时，会抛出 <classname>ValueError</classname> 或 <classname>TypeError</classname>。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.3.0</entry>
      <entry>
       当字段的值或类型不能正确匹配 PostgreSQL 的类型时，现在会抛出 <classname>ValueError</classname> 或
       <classname>TypeError</classname> 错误；之前触发 <constant>E_WARNING</constant>。
      </entry>
     </row>
     &pgsql.changelog.connection-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_convert</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php 
  $dbconn = pg_connect('dbname=foo');
  
  $tmp = array(
      'author' => 'Joe Thackery',
      'year' => 2005,
      'title' => 'My Life, by Joe Thackery'
  );
  
  $vals = pg_convert($dbconn, 'authors', $tmp);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_meta_data</function></member>
    <member><function>pg_insert</function></member>
    <member><function>pg_select</function></member>
    <member><function>pg_update</function></member>
    <member><function>pg_delete</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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