<?xml version="1.0" encoding="utf-8"?>
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<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.80 -->
<refentry xml:id="function.pg-update" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_update</refname>
  <refpurpose>
   Update table
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>bool</type></type><methodname>pg_update</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><type>array</type><parameter>conditions</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>PGSQL_DML_EXEC</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_update</function> updates records that matches
   <parameter>conditions</parameter> with <parameter>values</parameter>.
  </para>
  <para>
   If <parameter>flags</parameter> is specified,
   <function>pg_convert</function> is applied to
   <parameter>values</parameter> with the specified flags.
  </para>
  <para>
   By default <function>pg_update</function> passes raw values.
   Values must be escaped or the <constant>PGSQL_DML_ESCAPE</constant> flag
   must be specified in <parameter>flags</parameter>.
   <constant>PGSQL_DML_ESCAPE</constant> quotes and escapes parameters/identifiers.
   Therefore, table/column names become case sensitive.
  </para>
  <para>
   Note that neither escape nor prepared query can protect LIKE query,
   JSON, Array, Regex, etc. These parameters should be handled
   according to their contexts. i.e. Escape/validate values.
  </para>
 </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>
       Name of the table into which to update rows.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>values</parameter></term>
     <listitem>
      <para>
       An <type>array</type> whose keys are field names in the table <parameter>table_name</parameter>,
       and whose values are what matched rows are to be updated to.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>conditions</parameter></term>
     <listitem>
      <para>
       An <type>array</type> whose keys are field names in the table <parameter>table_name</parameter>,
       and whose values are the conditions that a row must meet to be updated.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       Any number of <constant>PGSQL_CONV_FORCE_NULL</constant>,
       <constant>PGSQL_DML_NO_CONV</constant>,
       <constant>PGSQL_DML_ESCAPE</constant>,
       <constant>PGSQL_DML_EXEC</constant>,
       <constant>PGSQL_DML_ASYNC</constant> or
       <constant>PGSQL_DML_STRING</constant> combined. If <constant>PGSQL_DML_STRING</constant> is part of the
       <parameter>flags</parameter> then query string is returned. When <constant>PGSQL_DML_NO_CONV</constant>
       or <constant>PGSQL_DML_ESCAPE</constant> is set, it does not call <function>pg_convert</function> internally.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;  Returns <type>string</type> if <constant>PGSQL_DML_STRING</constant> is passed
   via <parameter>flags</parameter>.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.connection-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_update</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php 
  $db = pg_connect('dbname=foo');
  $data = array('field1'=>'AA', 'field2'=>'BB');
  // This is safe somewhat, since all values are escaped.
  // However PostgreSQL supports JSON/Array. These are not
  // safe by neither escape nor prepared query.
  $res = pg_update($db, 'post_log', $_POST, $data);
  if ($res) {
      echo "Data is updated: $res\n";
  } else {
      echo "User must have sent wrong inputs\n";
  }
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_convert</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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