php-doc-en/reference/uodbc/functions/odbc-num-rows.xml

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<refentry xml:id="function.odbc-num-rows" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>odbc_num_rows</refname>
  <refpurpose>Number of rows in a result</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>int</type><methodname>odbc_num_rows</methodname>
   <methodparam><type>resource</type><parameter>result_id</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>odbc_num_rows</function> will return the number of rows
   in an ODBC result.  This function will return -1 on error.  For
   INSERT, UPDATE and DELETE statements
   <function>odbc_num_rows</function> returns the number of rows
   affected.  For a SELECT clause this <literal>can</literal> be
   the number of rows available.
  </para>
  <para>
   Note: Using <function>odbc_num_rows</function> to determine the
   number of rows available after a SELECT will return -1 with many
   drivers.
  </para>
 </refsect1>
</refentry>

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