(PHP 5 >= 5.1.0, PHP 7, PHP 8)
pg_prepare — Submits a request to create a prepared statement with the given parameters, and waits for completion
pg_prepare() creates a prepared statement for later execution with pg_execute() or pg_send_execute(). This feature allows commands that will be used repeatedly to be parsed and planned just once, rather than each time they are executed. pg_prepare() is supported only against PostgreSQL 7.4 or higher connections; it will fail when using earlier versions.
The function creates a prepared statement named stmtname
from the query
string, which must contain a single SQL command. stmtname
may be "" to
create an unnamed statement, in which case any pre-existing unnamed
statement is automatically replaced; otherwise it is an error if the
statement name is already defined in the current session. If any parameters
are used, they are referred to in the query
as $1, $2, etc.
Prepared statements for use with pg_prepare() can also be created by
executing SQL PREPARE
statements. (But pg_prepare() is more flexible since it
does not require parameter types to be pre-specified.) Also, although there
is no PHP function for deleting a prepared statement, the SQL DEALLOCATE
statement can be used for that purpose.
connection
PgSql\Connection
nesnesi. bağlantı
belirtilmemişse öntanımlı bağlantı
kullanılır. Öntanımlı bağlantı pg_connect()
veya pg_pconnect() işleviyle kurulmuş son bağlantıdır.
PHP 8.1.0 ve sonrasında, öntanımlı bağlantının kullanımı önerilmemektedir.
stmtname
The name to give the prepared statement. Must be unique per-connection. If "" is specified, then an unnamed statement is created, overwriting any previously defined unnamed statement.
query
The parameterized SQL statement. Must contain only a single statement. (multiple statements separated by semi-colons are not allowed.) If any parameters are used, they are referred to as $1, $2, etc.
An PgSql\Result instance on success, başarısızlık durumunda false
döner.
Sürüm: | Açıklama |
---|---|
8.1.0 | Artık PgSql\Result nesnesi dönüyor; evvelce bir özkaynak dönerdi. |
8.1.0 |
bağlantı bağımsız değişkeni artık
PgSql\Connection nesnesi kabul ediyor, evvelce bir
özkaynak kabul ederdi.
|
Örnek 1 Using pg_prepare()
<?php
// Connect to a database named "mary"
$dbconn = pg_connect("dbname=mary");
// Prepare a query for execution
$result = pg_prepare($dbconn, "my_query", 'SELECT * FROM shops WHERE name = $1');
// Execute the prepared query. Note that it is not necessary to escape
// the string "Joe's Widgets" in any way
$result = pg_execute($dbconn, "my_query", array("Joe's Widgets"));
// Execute the same prepared query, this time with a different parameter
$result = pg_execute($dbconn, "my_query", array("Clothes Clothes Clothes"));
?>