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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<refentry xml:id="function.odbc-foreignkeys" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>odbc_foreignkeys</refname>
<refpurpose>Retrieves a list of foreign keys</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>resource</type><methodname>odbc_foreignkeys</methodname>
<methodparam><type>resource</type><parameter>connection_id</parameter></methodparam>
<methodparam><type>string</type><parameter>pk_qualifier</parameter></methodparam>
<methodparam><type>string</type><parameter>pk_owner</parameter></methodparam>
<methodparam><type>string</type><parameter>pk_table</parameter></methodparam>
<methodparam><type>string</type><parameter>fk_qualifier</parameter></methodparam>
<methodparam><type>string</type><parameter>fk_owner</parameter></methodparam>
<methodparam><type>string</type><parameter>fk_table</parameter></methodparam>
</methodsynopsis>
<para>
Retrieves a list of foreign keys in the specified table or a list of
foreign keys in other tables that refer to the primary key in the
specified table
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>connection_id</parameter></term>
<listitem>
&odbc.connection.id;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pk_qualifier</parameter></term>
<listitem>
<para>
The primary key qualifier.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pk_owner</parameter></term>
<listitem>
<para>
The primary key owner.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>pk_table</parameter></term>
<listitem>
<para>
The primary key table.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>fk_qualifier</parameter></term>
<listitem>
<para>
The foreign key qualifier.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>fk_owner</parameter></term>
<listitem>
<para>
The foreign key owner.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>fk_table</parameter></term>
<listitem>
<para>
The foreign key table.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an ODBC result identifier or &false; on failure.
</para>
<para>
The result set has the following columns:
<itemizedlist>
<listitem><simpara>PKTABLE_QUALIFIER</simpara></listitem>
<listitem><simpara>PKTABLE_OWNER</simpara></listitem>
<listitem><simpara>PKTABLE_NAME</simpara></listitem>
<listitem><simpara>PKCOLUMN_NAME</simpara></listitem>
<listitem><simpara>FKTABLE_QUALIFIER</simpara></listitem>
<listitem><simpara>FKTABLE_OWNER</simpara></listitem>
<listitem><simpara>FKTABLE_NAME</simpara></listitem>
<listitem><simpara>FKCOLUMN_NAME</simpara></listitem>
<listitem><simpara>KEY_SEQ</simpara></listitem>
<listitem><simpara>UPDATE_RULE</simpara></listitem>
<listitem><simpara>DELETE_RULE</simpara></listitem>
<listitem><simpara>FK_NAME</simpara></listitem>
<listitem><simpara>PK_NAME</simpara></listitem>
</itemizedlist>
</para>
<simpara>
If <parameter>pk_table</parameter> contains a table name,
<function>odbc_foreignkeys</function> returns a result set
containing the primary key of the specified table and all of the
foreign keys that refer to it.
</simpara>
<simpara>
If <parameter>fk_table</parameter> contains a table name,
<function>odbc_foreignkeys</function> returns a result set
containing all of the foreign keys in the specified table and the
primary keys (in other tables) to which they refer.
</simpara>
<simpara>
If both <parameter>pk_table</parameter> and
<parameter>fk_table</parameter> contain table names,
<function>odbc_foreignkeys</function> returns the foreign keys in
the table specified in <parameter>fk_table</parameter> that refer
to the primary key of the table specified in
<parameter>pk_table</parameter>. This should be one key at most.
</simpara>
</refsect1>
</refentry>
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