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(PECL ibm_db2 >= 1.0.0)
db2_exec — Executes an SQL statement directly
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.
A valid database connection resource variable as returned from db2_connect() or db2_pconnect().
An SQL statement. The statement cannot contain any parameter markers.
An associative array containing statement options. You can use this parameter to request a scrollable cursor on database servers that support this functionality.
For a description of valid statement options, see db2_set_option().
Returns a statement resource if the SQL statement was issued successfully, or FALSE if the database failed to execute the SQL statement.
Beispiel #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... ";
}
}
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Successfully created the table. Insert... Insert... Insert... Insert... Insert... Insert... Insert...
Beispiel #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";
}
}
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Bubbles Gizmo Pook Rickety Ride
Beispiel #3 Returning XML data as an 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 an 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);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
1000 Kathy Smith 416-555-1358 1001 Kathy Smith 905-555-7258
Beispiel #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 an 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);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
1001 Kathy Smith 905-555-7258 5002 Shipped
Beispiel #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);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
<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>
if you have the error message : PHP Warning: db2_exec() [<a href='function.db2-exec'>function.db2-exec</a>]: Statement Execute Failed in (....)
and cannot display the error message using db2_stmt_errormsg() , then check if your database connection handle is (still) valid
If you need to "emulate" offset/limit (as PEAR::DB puts it) for db2 queries, you will definitely need to add array('cursor' => DB2_SCROLLABLE) to your db2_exec() call. Otherwise, you will get nothing useful from db2_fetch_{whatever}() when you try to (see following hack for example):
<?php
$limit = 10;
$offset = 20;
for ($i = 0; $i < $limit && $row = db2_fetch_array($result, $offset + $i); $i++) {
// stuff goes here
}
?>
You can accomplish the same time of thing using sub-selects, "with" statements and other things new to me in the world of DB2, but the more dynamically generated the queries, the more difficult it gets to implement limit/offset behavior on the fly.
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