PHP. Руководство по PHP. 2005

mysqli_prepare

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mysqli_prepare

(PHP 5)mysqli_prepare

(no version information, might be only in CVS)mysqli->prepare --

Prepare a SQL statement for execution

Description

Procedure style:mysqli_stmt mysqli_prepare (mysqli link, string query)

Object oriented style (method)class mysqli {

mysqli_stmt prepare (string query)

}

mysqli_prepare() prepares the SQL query pointed to by the

null-terminated string query, and returns a statement handle to be used for

further operations on the statement. The query must consist of a single SQL statement.

Замечание:

You should not add a terminating semicolon or \g

to the statement.

The parameter query can include one or more parameter markers
in the SQL statement by embedding question mark (?) characters
at the appropriate positions.
Замечание:
The markers are legal only in certain places in SQL statements.
For example, they are allowed in the VALUES() list of an INSERT statement
(to specify column values for a row), or in a comparison with a column in
a WHERE clause to specify a comparison value.
However, they are not allowed for identifiers (such as table or column names),
in the select list that names the columns to be returned by a SELECT statement,
or to specify both operands of a binary operator such as the =
equal sign. The latter restriction is necessary because it would be impossible
to determine the parameter type. It's not allowed to compare marker
with NULL by ? IS NULL too.
In general, parameters are legal only in Data
Manipulation Languange (DML) statements, and not in Data Defination Language
(DDL) statements.

Примеры

Пример 1. Object oriented style


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()){
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

$city = "Amersfoort";

/* create a prepared statement */
if ($stmt = $mysqli->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);

/* close statement */
$stmt->close();
}

/* close connection */
$mysqli->close();
?>

Пример 2. Procedural style


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()){
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

$city = "Amersfoort";

/* create a prepared statement */
if ($stmt = mysqli_prepare($link, "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);

/* close statement */
mysqli_stmt_close($stmt);
}

/* close connection */
mysqli_close($link);
?>

Результат выполнения данного примера:

Amersfoort is in district Utrecht

PHP. Руководство по PHP. 2005

mysqli_prepare

Description

Возвращаемые значения

Смотрите также

Примеры

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