db2_exec

(PECL ibm_db2 >= 1.0.0)

db2_exec Executes an SQL statement directly

Descrizione

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

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.

Elenco dei parametri

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.

For a description of valid statement options, see db2_set_option().

Valori restituiti

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

Esempi

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... ";
    }
}
?>

Il precedente esempio visualizzerà:

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";
    }

?>

Il precedente esempio visualizzerà:

Bubbles
Gizmo
Pook
Rickety Ride

Example #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);

?>

Il precedente esempio visualizzerà:

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 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);

?>

Il precedente esempio visualizzerà:

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);

?>

Il precedente esempio visualizzerà:

<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>

Vedere anche:

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User Contributed Notes 2 notes

up
1
shawn at frozen-o dot com
13 years ago
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.
up
-6
duc
13 years ago
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
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