PHP Manual: db2_exec


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db2_exec

(PECL)

db2_exec --  Executes an SQL statement directly

Description

resource db2_exec ( resource connection, string statement [, array options] )

Executes an SQL statement directly.

If you plan to interpolate PHP variables into the SQL statement, understand that this is one of the more common security exposures. Consider calling db2_prepare() to prepare an SQL statement with parameter markers for input values. Then you can call db2_execute() to pass in the input values and avoid SQL injection attacks.

If you plan to repeatedly issue the same SQL statement with different parameters, consider calling db2_prepare() and db2_execute() to enable the database server to reuse its access plan and increase the efficiency of your database access.

Parameters

connection

A valid database connection resource variable as returned from db2_connect() or db2_pconnect().

statement

An SQL statement. The statement cannot contain any parameter markers.

options

An associative array containing statement options. You can use this parameter to request a scrollable cursor on database servers that support this functionality.

cursor

Passing the DB2_FORWARD_ONLY value requests a forward-only cursor for this SQL statement. This is the default type of cursor, and it is supported by all database servers. It is also much faster than a scrollable cursor.

Passing the DB2_SCROLLABLE value requests a scrollable cursor for this SQL statement. This type of cursor enables you to fetch rows non-sequentially from the database server. However, it is only supported by DB2 servers, and is much slower than forward-only cursors.

Return Values

Returns a statement resource if the SQL statement was issued successfully, or FALSE if the database failed to execute the SQL statement.

Examples

Example 1. Creating a table with db2_exec()

The following example uses db2_exec() to issue a set of DDL statements in the process of creating a table.

<?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... ";
    }
}
?>

The above example will output:

Successfully created the table.
Insert... Insert... Insert... Insert... Insert... Insert... Insert...

Example 2. Executing a SELECT statement with a scrollable cursor

The following example demonstrates how to request a scrollable cursor for an SQL statement issued by db2_exec().

<?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";
    }
}
?>

The above example will output:

Bubbles
Gizmo
Pook
Rickety Ride

Example 3. Returning XML data as a SQL ResultSet

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 a SQL ResultSet format that most users are familiar with.

<?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);

?>

The above example will output:

1000     Kathy Smith     416-555-1358
1001     Kathy Smith     905-555-7258

Example 4. Performing a "JOIN" with XML data

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 a SQL ResultSet with information regarding shipping status for the customer.

<?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);

?>

The above example will output:

1001     Kathy Smith     905-555-7258     5002     Shipped

Example 5. Returning SQL data as part of a larger XML document

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).

<?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);

?>

The above example will output:

<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>