IBM DB2 函数
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db2_prepare

(PECL ibm_db2 >= 1.0.0)

db2_prepare Prepares an SQL statement to be executed

说明

resource db2_prepare ( resource $connection , string $statement [, array $options ] )

db2_prepare() creates a prepared SQL statement which can include 0 or more parameter markers (? characters) representing parameters for input, output, or input/output. You can pass parameters to the prepared statement using db2_bind_param(), or for input values only, as an array passed to db2_execute().

There are three main advantages to using prepared statements in your application:

参数

connection

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

statement

An SQL statement, optionally containing one or more 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 successfully parsed and prepared by the database server. Returns FALSE if the database server returned an error. You can determine which error was returned by calling db2_stmt_error() or db2_stmt_errormsg().

范例

Example #1 Preparing and executing an SQL statement with parameter markers

The following example prepares an INSERT statement that accepts four parameter markers, then iterates over an array of arrays containing the input values to be passed to db2_execute().

<?php
$animals 
= array(
    array(
0'cat''Pook'3.2),
    array(
1'dog''Peaches'12.3),
    array(
2'horse''Smarty'350.0),
);

$insert 'INSERT INTO animals (id, breed, name, weight)
    VALUES (?, ?, ?, ?)'
;
$stmt db2_prepare($conn$insert);
if (
$stmt) {
    foreach (
$animals as $animal) {
        
$result db2_execute($stmt$animal);
    }
}
?>

参见


IBM DB2 函数
在线手册:中文 英文
PHP手册
PHP手册 - N: Prepares an SQL statement to be executed

用户评论:

gjarrige at six-axe dot fr (26-Mar-2012 03:47)

I found a bug in the code I posted the 02-Mar-2012 at 04:20 for the scroll cursor technique : to correct it, delete the line with the variable $max_offset.
For a better code :
public static function getScrollCursor($db, $sql, $args, $offset, $nblines_by_page ) {
   if (!is_array($args)) {
       $args = array() ;
    }
    $offset = intval($offset) ;
    if ($offset <= 0) {
        $offset = 1 ;
    }
    $nbl_by_page = intval($nbl_by_page);
    if ($nbl_by_page <= 0) {
        $nbl_by_page = 10 ;
    }
    $rows = array() ;
    $st = db2_prepare ( $db, $sql, array('cursor' => DB2_SCROLLABLE) );
    if (! $st) {
        // place your error message here
        $rows = null;
    } else {
        if (! db2_execute ( $st, $args )) {
            // place your error message here
            $rows = null;
        } else {
            for (
                    $tofetch = $nbl_par_page,
                    $row = db2_fetch_assoc ( $st, $offset);
            $row !== false && $tofetch-- > 0;
            $row = db2_fetch_assoc ( $st )
            ) {
                $rows [] = $row;
            }
        }
        db2_free_stmt($st);
    }
    return $rows ;
}

gjarrige at six-axe dot fr (02-Mar-2012 11:20)

This technique enables to paginate into a DB2 for i5 (or IBM i) platform :

public static function getScrollCursor($db, $sql, $args, $offset, $nblines_by_page ) {
    $rows = array() ;
    $st = db2_prepare ( $db, $sql, array('cursor' => DB2_SCROLLABLE) );
    if (! $st) {
        // place your error message here
        $rows = null;
    } else {
        if (! db2_execute ( $st, $args )) {
            // place your error message here
            $rows = null;
        } else {
            $max_offset = $offset + $nblines_by_page - 1 ;
            for (
                    $tofetch = $nbl_par_page,
                    $row = db2_fetch_assoc ( $st, $max_offset);
            $row !== false && $tofetch-- > 0;
            $row = db2_fetch_assoc ( $st )
            ) {
                $rows [] = $row;
            }
        }
        db2_free_stmt($st);
    }
    return $rows ;
}

NormInNorman (18-Nov-2009 03:52)

If you are having problems with scrollable cursors and the prepare statement, I've found that you cant set the scrollable option on the connection.  The following code (which tries to get the 2nd record):

<?php
$sql
= "SELECT * FROM SCHEMA.TABLENAME";
$options = array('cursor' => DB2_SCROLLABLE);
$conn = db2_connect($database, $user, $password,$options);
$stmt = db2_prepare($conn, $sql);
$result = db2_execute($stmt);
$row = db2_fetch_both($stmt, 2);

$conn = db2_connect($database, $user, $password);
$stmt = db2_prepare($conn, $sql, $options);
$result = db2_execute($stmt);
$row = db2_fetch_both($stmt, 2);
?>

Will result in the following error:

Warning: db2_fetch_both() [function.db2-fetch-both]: Fetch Failure in dbtest.php on line 7

In fact, even if you set the options on both the connection and the prepare your fetch will not work. You must only set that option on the prepare.

ndt.db2 at google mail (13-Aug-2006 02:41)

if you have the error message : PHP Warning:  db2_prepare() [<a href='function.db2-prepare'>function.db2-prepare</a>]: Statement Prepare Failed in (....)
and cannot display the error message using db2_stmt_errormsg() , then check if your database connection handle is (still) valid