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db2_prepare
Prepares an SQL statement to be executed
(PECL ibm_db2:1.0-1.6.2)
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:
Performance: 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 db2_execute() enables the statements to reuse that access plan and avoids the overhead of dynamically creating a new access plan for every statement you issue.
Security: 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.
Advanced functionality: 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 db2_bind_param().
Parameters
- 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.
- cursor
Passing the
DB2_FORWARD_ONLYvalue requests a forward-only cursor for this SQL statement. This is the default type of cursor, and it is supported by all database servers. It is also much faster than a scrollable cursor.Passing the
DB2_SCROLLABLEvalue requests a scrollable cursor for this SQL statement. This type of cursor enables you to fetch rows non-sequentially from the database server. However, it is only supported by DB2 servers, and is much slower than forward-only cursors.
Return Values
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().
Examples
Example 949. 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);
}
}
?>