<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
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<refentry xml:id="function.db2-exec" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>db2_exec</refname>
  <refpurpose>
   Executes an SQL statement directly
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>resource</type><type>false</type></type><methodname>db2_exec</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam><type>string</type><parameter>statement</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>options</parameter><initializer>[]</initializer></methodparam>
  </methodsynopsis>


  <para>
   Executes an SQL statement directly.
  </para>
  <para>
   If you plan to interpolate PHP variables into the SQL statement, understand
   that this is one of the more common security exposures. Consider calling
   <function>db2_prepare</function> to prepare an SQL statement with parameter
   markers for input values. Then you can call <function>db2_execute</function>
   to pass in the input values and avoid SQL injection attacks.
  </para>
  <para>
   If you plan to repeatedly issue the same SQL statement with different
   parameters, consider calling <function>db2_prepare</function> and
   <function>db2_execute</function> to enable the database server to reuse its
   access plan and increase the efficiency of your database access.
  </para>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      <para>
       A valid database connection resource variable as returned from
       <function>db2_connect</function> or <function>db2_pconnect</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>statement</parameter></term>
     <listitem>
      <para>
       An SQL statement. The statement cannot contain any parameter markers.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       An associative array containing statement options. You can use this
       parameter to request a scrollable cursor on database servers that
       support this functionality.
      </para>
      <para>
       For a description of valid statement options, see 
       <function>db2_set_option</function>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a statement resource if the SQL statement was issued successfully,
   or &false; if the database failed to execute the SQL statement.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Creating a table with <function>db2_exec</function></title>
    <para>
     The following example uses <function>db2_exec</function> to issue a set
     of DDL statements in the process of creating a table.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$conn = db2_connect($database, $user, $password);

// Create the test table
$create = 'CREATE TABLE animals (id INTEGER, breed VARCHAR(32),
    name CHAR(16), weight DECIMAL(7,2))';
$result = db2_exec($conn, $create);
if ($result) {
    print "Successfully created the table.\n";
}

// Populate the test table
$animals = array(
    array(0, 'cat', 'Pook', 3.2),
    array(1, 'dog', 'Peaches', 12.3),
    array(2, 'horse', 'Smarty', 350.0),
    array(3, 'gold fish', 'Bubbles', 0.1),
    array(4, 'budgerigar', 'Gizmo', 0.2),
    array(5, 'goat', 'Rickety Ride', 9.7),
    array(6, 'llama', 'Sweater', 150)
);

foreach ($animals as $animal) {
    $rc = db2_exec($conn, "INSERT INTO animals (id, breed, name, weight)
      VALUES ({$animal[0]}, '{$animal[1]}', '{$animal[2]}', {$animal[3]})");
    if ($rc) {
        print "Insert... ";
    }
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Successfully created the table.
Insert... Insert... Insert... Insert... Insert... Insert... Insert... 
]]>
    </screen>
   </example>

   <example>
    <title>Executing a SELECT statement with a scrollable cursor</title>
    <para>
     The following example demonstrates how to request a scrollable cursor for
     an SQL statement issued by <function>db2_exec</function>.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$conn = db2_connect($database, $user, $password);
$sql = "SELECT name FROM animals
    WHERE weight < 10.0
    ORDER BY name";
if ($conn) {
    require_once 'prepare.inc';
    $stmt = db2_exec($conn, $sql, array('cursor' => DB2_SCROLLABLE));
    while ($row = db2_fetch_array($stmt)) {
        print "$row[0]\n";
    }
} 
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Bubbles
Gizmo
Pook
Rickety Ride
]]>
    </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 = \'Kathy Smith\'
    ';
$stmt = db2_exec($conn, $query);

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 = \'Kathy Smith\'
';

$stmt = db2_exec($conn, $query);

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 = \'100-100-01\'
';

$stmt = db2_exec($conn, $query);

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_execute</function></member>
    <member><function>db2_prepare</function></member>
   </simplelist>
  </para>
 </refsect1>


</refentry>
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