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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.pg-delete" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_delete</refname>
<refpurpose>
Deletes records
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>string</type><type>bool</type></type><methodname>pg_delete</methodname>
<methodparam><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
<methodparam><type>string</type><parameter>table_name</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_delete</function> deletes records from a table
specified by the keys and values in <parameter>conditions</parameter>.
</para>
<para>
If <parameter>flags</parameter> is specified,
<function>pg_convert</function> is applied to
<parameter>conditions</parameter> with the specified flags.
</para>
<para>
By default <function>pg_delete</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 from which to delete rows.
</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 values of those fields that are to be deleted.
</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_delete</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$db = pg_connect('dbname=foo');
// This is safe somewhat, since all values are escaped.
// However PostgreSQL supports JSON/Array. These are not
// safe by neither escape nor prepared query.
$res = pg_delete($db, 'post_log', $_POST, PG_DML_ESCAPE);
if ($res) {
echo "POST data is deleted: $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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