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<refentry xml:id="function.cubrid-query" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>cubrid_query</refname>
  <refpurpose>Send a CUBRID query</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>cubrid_query</methodname>
   <methodparam><type>string</type><parameter>query</parameter></methodparam>
   <methodparam choice="opt"><type>resource</type><parameter>conn_identifier</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>cubrid_query</function> sends a unique query (multiple queries are not supported) to the 
   currently active database on the server that's associated with the specified <parameter>conn_identifier</parameter>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>query</parameter></term>
     <listitem>
      <para>
       An SQL query
      </para>
      <para>
       Data inside the query should be <link linkend="function.cubrid-real-escape-string">properly escaped</link>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>conn_identifier</parameter></term>
     <listitem>
      <para>
       The CUBRID connection. If the connection identifier is not specified,
       the last connection opened by <function>cubrid_connect</function> is
       assumed.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning resultset,
   <function>cubrid_query</function> returns a <type>resource</type> on success, or &false; on error.
  </para>
  <para>
   For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc,
   <function>cubrid_query</function> returns &true; on success or &false; on error.
  </para>
  <para>
   The returned result resource should be passed to <function>cubrid_fetch_array</function>, and other
   functions for dealing with result tables, to access the returned data.
  </para>
  <para>
   Use <function>cubrid_num_rows</function> to find out how many rows were returned for a SELECT statement or
   <function>cubrid_affected_rows</function> to find out how many rows were affected by a DELETE, INSERT, REPLACE, or UPDATE statement.
  </para>
  <para>
   <function>cubrid_query</function> will also fail and return &false;
   if the user does not have permission to access the table(s) referenced by the query.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Invalid Query</title>
    <para>
     The following query is syntactically invalid, so <function>cubrid_query</function> fails and returns &false;.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$conn = cubrid_connect('localhost', 33000, 'demodb');

$result = cubrid_query('SELECT * WHERE 1=1');
if (!$result) {
    die('Invalid query: ' . cubrid_error());
}

?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>Valid Query</title>
    <para>
     The following query is valid, so <function>cubrid_query</function> returns a <type>resource</type>.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
// This could be supplied by a user, for example
$firstname = 'fred';
$lastname  = 'fox';

$conn = cubrid_connect('localhost', 33000, 'demodb');

cubrid_execute($conn,"DROP TABLE if exists friends");
cubrid_execute($conn,"create table friends(firstname varchar,lastname varchar,address char(24),age int)");
cubrid_execute($conn,"insert into friends values('fred','fox','home-1','20')");
cubrid_execute($conn,"insert into friends values('blue','cat','home-2','21')");
// Formulate Query
// This is the best way to perform an SQL query
// For more examples, see cubrid_real_escape_string()
$query = sprintf("SELECT firstname, lastname, address, age FROM friends WHERE firstname='%s' AND lastname='%s'",
cubrid_real_escape_string($firstname),
cubrid_real_escape_string($lastname));

// Perform Query
$result = cubrid_query($query);

// Check result
// This shows the actual query sent to CUBRID, and the error. Useful for debugging.
if (!$result) {
    $message  = 'Invalid query: ' . cubrid_error() . "\n";
    $message .= 'Whole query: ' . $query;
    die($message);
}

// Use result
// Attempting to print $result won't allow access to information in the resource
// One of the cubrid result functions must be used
// See also cubrid_result(), cubrid_fetch_array(), cubrid_fetch_row(), etc.
while ($row = cubrid_fetch_assoc($result)) {
    echo $row['firstname'];
    echo $row['lastname'];
    echo $row['address'];
    echo $row['age'];
}

// Free the resources associated with the result set
// This is done automatically at the end of the script
cubrid_free_result($result);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>cubrid_connect</function></member>
    <member><function>cubrid_error</function></member>
    <member><function>cubrid_real_escape_string</function></member>
    <member><function>cubrid_result</function></member>
    <member><function>cubrid_fetch_assoc</function></member>
    <member><function>cubrid_unbuffered_query</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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