db2_exec
(PECL ibm_db2 >= 1.0.0)
db2_exec — Executes an SQL statement directly
说明
$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.
参数
-
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() .
返回值
Returns a statement resource if the SQL statement was issued successfully,
or FALSE if the database failed to execute the SQL statement.
范例
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... " ;
}
}
?> 以上例程会输出：
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" ;
}
}
?> 以上例程会输出：
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 );
?> 以上例程会输出：
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 );
?> 以上例程会输出：
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 );
?> 以上例程会输出：
<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>
参见
- db2_execute() - Executes a prepared SQL statement
- db2_prepare() - Prepares an SQL statement to be executed
用户评论:
[#1] duc [2006-08-12 18:38:18]
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
[#2] shawn at frozen-o dot com [2006-05-19 10:34:35]
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.