(PHP 5, PHP 7, PHP 8)
mysqli_stmt::prepare -- mysqli_stmt_prepare — Prepares an SQL statement for execution
Об'єктно-орієнтований стиль
Процедурний стиль
Prepares a statement for execution. The query must consist of a single SQL statement.
The statement template can contain zero or more question mark
(?
) parameter markers—also called placeholders.
The parameter markers must be bound to application variables using
mysqli_stmt_bind_param() before executing the statement.
Зауваження:
In the case where a statement is passed to mysqli_stmt_prepare() that is longer than
max_allowed_packet
of the server, the returned error codes are different depending on whether you are using MySQL Native Driver (mysqlnd
) or MySQL Client Library (libmysqlclient
). The behavior is as follows:
mysqlnd
on Linux returns an error code of 1153. The error message meansgot a packet bigger than.max_allowed_packet
bytes
mysqlnd
on Windows returns an error code 2006. This error message meansserver has gone away.
libmysqlclient
on all platforms returns an error code 2006. This error message meansserver has gone away.
statement
Тільки процедурний стиль: об'єкт mysqli_stmt, якого повертає функція mysqli_stmt_init().
query
The query, as a string. It must consist of a single SQL statement.
The SQL statement may contain zero or more parameter markers
represented by question mark (?
) characters
at the appropriate positions.
Зауваження:
The markers are legal only in certain places in SQL statements. For example, they are permitted in the
VALUES()
list of anINSERT
statement (to specify column values for a row), or in a comparison with a column in aWHERE
clause to specify a comparison value. However, they are not permitted for identifiers (such as table or column names).
Якщо увімкнені звіти про помилки
mysqli (MYSQLI_REPORT_ERROR
) і запитана операція не
виконалась, буде виведено попередження, але якщо встановлено режим
MYSQLI_REPORT_STRICT
, буде викинуто виключення
mysqli_sql_exception.
Приклад #1 mysqli_stmt::prepare() example
Об'єктно-орієнтований стиль
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$city = "Amersfoort";
/* create a prepared statement */
$stmt = $mysqli->stmt_init();
$stmt->prepare("SELECT District FROM City WHERE Name=?");
/* bind parameters for markers */
$stmt->bind_param("s", $city);
/* execute query */
$stmt->execute();
/* bind result variables */
$stmt->bind_result($district);
/* fetch value */
$stmt->fetch();
printf("%s is in district %s\n", $city, $district);
Процедурний стиль
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
$city = "Amersfoort";
/* create a prepared statement */
$stmt = mysqli_stmt_init($link);
mysqli_stmt_prepare($stmt, "SELECT District FROM City WHERE Name=?");
/* bind parameters for markers */
mysqli_stmt_bind_param($stmt, "s", $city);
/* execute query */
mysqli_stmt_execute($stmt);
/* bind result variables */
mysqli_stmt_bind_result($stmt, $district);
/* fetch value */
mysqli_stmt_fetch($stmt);
printf("%s is in district %s\n", $city, $district);
Подані вище приклади виведуть:
Amersfoort is in district Utrecht