mysqli_stmt::prepare
mysqli_stmt_prepare
(PHP 5)
mysqli_stmt_prepare — Prepare a SQL statement for execution
Description
Object oriented style (method)
mixed mysqli_stmt::prepare
(
string $query
)
bool mysqli_stmt_prepare
( mysqli_stmt $stmt
, string $query
)
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.
Parameters
-
stmt
-
Procedural style only: A statement identifier
returned by mysqli_stmt_init().
-
query
-
The query, as a string. It must consist of a single SQL statement.
You can include one or more parameter markers in the SQL statement by
embedding question mark (?) characters at the
appropriate positions.
Note:
You should not add a terminating semicolon or \g
to the statement.
Note:
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. In general, parameters are legal only in Data
Manipulation Languange (DML) statements, and not in Data Definition Language
(DDL) statements.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
Example #1 Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$city = "Amersfoort";
$stmt = $mysqli->stmt_init();
if ($stmt->prepare("SELECT District FROM City WHERE Name=?")) {
$stmt->bind_param("s", $city);
$stmt->execute();
$stmt->bind_result($district);
$stmt->fetch();
printf("%s is in district %s\n", $city, $district);
$stmt->close();
}
$mysqli->close();
?>
Example #2 Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$city = "Amersfoort";
$stmt = mysqli_stmt_init($link);
if (mysqli_stmt_prepare($stmt, 'SELECT District FROM City WHERE Name=?')) {
mysqli_stmt_bind_param($stmt, "s", $city);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt, $district);
mysqli_stmt_fetch($stmt);
printf("%s is in district %s\n", $city, $district);
mysqli_stmt_close($stmt);
}
mysqli_close($link);
?>
The above example will output:
Amersfoort is in district Utrecht
mysqli_stmt->param_count
