<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
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<refentry xml:id="function.db2-execute" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>db2_execute</refname>
  <refpurpose>
   Executes a prepared SQL statement
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>db2_execute</methodname>
   <methodparam><type>resource</type><parameter>stmt</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>parameters</parameter></methodparam>
  </methodsynopsis>


  <para>
   <function>db2_execute</function> executes an SQL statement that was
   prepared by <function>db2_prepare</function>.
  </para>
  <para>
   If the SQL statement returns a result set, for example, a SELECT statement
   or a CALL to a stored procedure that returns one or more result sets, you
   can retrieve a row as an array from the <literal>stmt</literal> resource
   using <function>db2_fetch_assoc</function>,
   <function>db2_fetch_both</function>, or
   <function>db2_fetch_array</function>. Alternatively, you can use
   <function>db2_fetch_row</function> to move the result set pointer to the
   next row and fetch a column at a time from that row with
   <function>db2_result</function>.
  </para>
  <para>
   Refer to <function>db2_prepare</function> for a brief discussion of the
   advantages of using <function>db2_prepare</function> and
   <function>db2_execute</function> rather than <function>db2_exec</function>.
  </para>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>stmt</parameter></term>
     <listitem>
      <para>
       A prepared statement returned from <function>db2_prepare</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>parameters</parameter></term>
     <listitem>
      <para>
       An array of input parameters matching any parameter markers contained
       in the prepared statement.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Preparing and executing an SQL statement with parameter markers</title>
    <para>
     The following example prepares an INSERT statement that accepts four
     parameter markers, then iterates over an array of arrays containing the
     input values to be passed to <function>db2_execute</function>.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$pet = array(0, 'cat', 'Pook', 3.2);

$insert = 'INSERT INTO animals (id, breed, name, weight)
    VALUES (?, ?, ?, ?)';

$stmt = db2_prepare($conn, $insert);
if ($stmt) {
    $result = db2_execute($stmt, $pet);
    if ($result) {
        print "Successfully added new pet.";
    }
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Successfully added new pet.
]]>
    </screen>
   </example>
   <example>
    <title>Calling a stored procedure with an OUT parameter</title>
    <para>
     The following example prepares a CALL statement that accepts one 
     parameter marker representing an OUT parameter, binds the PHP variable
     <literal>$my_pets</literal> to the parameter using
     <function>db2_bind_param</function>, then issues
     <function>db2_execute</function> to execute the CALL statement. After the
     CALL to the stored procedure has been made, the value of
     <literal>$num_pets</literal> changes to reflect the value returned by the
     stored procedure for that OUT parameter.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$num_pets = 0;
$res = db2_prepare($conn, "CALL count_my_pets(?)");
$rc = db2_bind_param($res, 1, "num_pets", DB2_PARAM_OUT);
$rc = db2_execute($res);
print "I have $num_pets pets!";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
I have 7 pets!
]]>
    </screen>
   </example>
   <example>
    <title>Returning XML data as an SQL ResultSet</title>
    <para>
     The following example demonstrates how to work with documents stored 
     in a XML column using the SAMPLE database. Using some pretty simple 
     SQL/XML, this example returns some of the nodes in a XML document in 
     an SQL ResultSet format that most users are familiar with.
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

$query = 'SELECT * FROM XMLTABLE(
    XMLNAMESPACES (DEFAULT \'http://posample.org\'),
    \'db2-fn:xmlcolumn("CUSTOMER.INFO")/customerinfo\'
    COLUMNS
    "CID" VARCHAR (50) PATH \'@Cid\',
    "NAME" VARCHAR (50) PATH \'name\',
    "PHONE" VARCHAR (50) PATH \'phone [ @type = "work"]\'
    ) AS T
    WHERE NAME = ?
    ';

$stmt = db2_prepare($conn, $query);

$name = 'Kathy Smith';

if ($stmt) {
    db2_bind_param($stmt, 1, "name", DB2_PARAM_IN);
    db2_execute($stmt);

    while($row = db2_fetch_object($stmt)){
    printf("$row->CID     $row->NAME     $row->PHONE\n");
    }
}
db2_close($conn);

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1000     Kathy Smith     416-555-1358
1001     Kathy Smith     905-555-7258
]]>
    </screen>
   </example>
   <example>
    <title>Performing a "JOIN" with XML data</title>
    <para>
     The following example works with documents stored in 2 different 
     XML columns in the SAMPLE database. It creates 2 temporary 
     tables from the XML documents from 2 different columns and 
     returns an SQL ResultSet with information regarding shipping 
     status for the customer.
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

$query = '
SELECT A.CID, A.NAME, A.PHONE, C.PONUM, C.STATUS
FROM
XMLTABLE(
XMLNAMESPACES (DEFAULT \'http://posample.org\'),
\'db2-fn:xmlcolumn("CUSTOMER.INFO")/customerinfo\'
COLUMNS
"CID" BIGINT PATH \'@Cid\',
"NAME" VARCHAR (50) PATH \'name\',
"PHONE" VARCHAR (50) PATH \'phone [ @type = "work"]\'
) as A,
PURCHASEORDER AS B,
XMLTABLE (
XMLNAMESPACES (DEFAULT \'http://posample.org\'),
\'db2-fn:xmlcolumn("PURCHASEORDER.PORDER")/PurchaseOrder\'
COLUMNS
"PONUM"  BIGINT PATH \'@PoNum\',
"STATUS" VARCHAR (50) PATH \'@Status\'
) as C
WHERE A.CID = B.CUSTID AND
    B.POID = C.PONUM AND
    A.NAME = ?
';

$stmt = db2_prepare($conn, $query);

$name = 'Kathy Smith';

if ($stmt) {
    db2_bind_param($stmt, 1, "name", DB2_PARAM_IN);
    db2_execute($stmt);

    while($row = db2_fetch_object($stmt)){
    printf("$row->CID     $row->NAME     $row->PHONE     $row->PONUM     $row->STATUS\n");
    }
}

db2_close($conn);

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1001     Kathy Smith     905-555-7258     5002     Shipped
]]>
    </screen>
   </example>
   <example>
    <title>Returning SQL data as part of a larger XML document</title>
    <para>
     The following example works with a portion of the PRODUCT.DESCRIPTION 
     documents in the SAMPLE database. It creates a XML document containing 
     product description (XML data) and pricing info (SQL data).
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$conn = db2_connect("SAMPLE", "db2inst1", "ibmdb2");

$query = '
SELECT
XMLSERIALIZE(
XMLQUERY(\'
    declare boundary-space strip;
    declare default element namespace "http://posample.org";
    <promoList> {
    for $prod in $doc/product
    where $prod/description/price < 10.00
    order by $prod/description/price ascending
    return(
        <promoitem> {
        $prod,
        <startdate> {$start} </startdate>,
        <enddate> {$end} </enddate>,
        <promoprice> {$promo} </promoprice>
            } </promoitem>
    )
    } </promoList>
\' passing by ref DESCRIPTION AS "doc",
PROMOSTART as "start",
PROMOEND as "end",
PROMOPRICE as "promo"
RETURNING SEQUENCE)
AS CLOB (32000))
AS NEW_PRODUCT_INFO
FROM PRODUCT
WHERE PID = ?
';

$stmt = db2_prepare($conn, $query);

$pid = "100-100-01";

if ($stmt) {
    db2_bind_param($stmt, 1, "pid", DB2_PARAM_IN);
    db2_execute($stmt);

    while($row = db2_fetch_array($stmt)){
    printf("$row[0]\n");
    }
}

db2_close($conn);

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
<promoList xmlns="http://posample.org">
    <promoitem>
    <product pid="100-100-01">
        <description>
            <name>Snow Shovel, Basic 22 inch</name>
            <details>Basic Snow Shovel, 22 inches wide, straight handle with D-Grip</details>
            <price>9.99</price>
            <weight>1 kg</weight>
        </description>
    </product>
    <startdate>2004-11-19</startdate>
    <enddate>2004-12-19</enddate>
    <promoprice>7.25</promoprice>
    </promoitem>
</promoList>
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>db2_exec</function></member>
    <member><function>db2_fetch_array</function></member>
    <member><function>db2_fetch_assoc</function></member>
    <member><function>db2_fetch_both</function></member>
    <member><function>db2_fetch_row</function></member>
    <member><function>db2_prepare</function></member>
    <member><function>db2_result</function></member>
   </simplelist>
  </para>
 </refsect1>


</refentry>

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