(PHP 5, PHP 7)
mysqli::prepare -- mysqli_prepare — Prepare an SQL statement for execution
Object oriented style
public mysqli::prepare ( string $query ) : mysqli_stmt
Procedural style
mysqli_prepare ( mysqli $link , string $query ) : mysqli_stmt
Prepares the SQL query, and returns a statement handle to be used for further operations on the statement. The query must consist of a single SQL statement.
The parameter markers must be bound to application variables using mysqli_stmt_bind_param() and/or mysqli_stmt_bind_result() before executing the statement or fetching rows.
link
Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()
query
The query, as a string.
Note:
You should not add a terminating semicolon or
\gto the statement.
This parameter can include one or more parameter markers in the SQL statement by embedding question mark (?) characters at the appropriate positions.
Note:
The markers are legal only in certain places in SQL statements. For example, they are allowed in the
VALUES()list of anINSERTstatement (to specify column values for a row), or in a comparison with a column in aWHEREclause 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
SELECTstatement, 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 withNULLby? IS NULLtoo. In general, parameters are legal only in Data Manipulation Language (DML) statements, and not in Data Definition Language (DDL) statements.
mysqli_prepare() returns a statement object or false if an error occurred.
Example #1 mysqli::prepare() example
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();
?> 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);
?> The above examples will output:
Amersfoort is in district Utrecht
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/mysqli.prepare.php