db2_prepare

db2_prepare

Prepares an SQL statement to be executed

 **db2_prepare** resource $connection string $statement array $options

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 , or for input values only, as an array passed to . db2_prepare``?``db2_bind_param``db2_execute

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

• : when you prepare a statement, the database server creates an optimized access plan for retrieving data with that statement. Subsequently issuing the prepared statement with enables the statements to reuse that access plan and avoids the overhead of dynamically creating a new access plan for every statement you issue. Performancedb2_execute
• : when you prepare a statement, you can include parameter markers for input values. When you execute a prepared statement with input values for placeholders, the database server checks each input value to ensure that the type matches the column definition or parameter definition. Security
• : Parameter markers not only enable you to pass input values to prepared SQL statements, they also enable you to retrieve OUT and INOUT parameters from stored procedures using . Advanced functionalitydb2_bind_param

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

statementAn SQL statement, optionally containing one or more parameter markers..

optionsAn 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 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 or . db2_stmt_error``db2_stmt_errormsg

Voorbeeld: 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);
    }
}
?>

db2_bind_param``db2_execute``db2_stmt_error``db2_stmt_errormsg