PHP Dokumentation: Mysqli-stmt prepare
12. Januar 2010 von werner
mysqli_stmt::prepare
mysqli_stmt_prepare
(PHP 5)
mysqli_stmt::prepare — mysqli_stmt_prepare — Prepare a SQL statement for execution
Beschreibung
Object oriented style (method)
Procedure style:
Prepares the SQL query pointed to by the null-terminated 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.
Parameter-Liste
- stmt
Nur bei prozeduralem Aufruf: ein vonmysqli_stmt_init() zurückgegebensStatementobjekt.
- 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.
Hinweis: You should not add a terminating semicolon or \g to the statement.
Hinweis: 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 Language (DML) statements, and not in Data Definition Language (DDL) statements.
Rückgabewerte
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiele
Beispiel #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 */
$stmt = $mysqli->stmt_init();
if ($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);
/* close statement */
$stmt->close();
}/* close connection */
$mysqli->close();
?>Beispiel #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 */
$stmt = mysqli_stmt_init($link);
if (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, $district);
/* close statement */
mysqli_stmt_close($stmt);
}/* close connection */
mysqli_close($link);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Amersfoort is in district Utrecht
Siehe auch
mysqli_stmt_init() – Initializes a statement and returns an object for use with mysqli_stmt_prepare, mysqli_stmt_execute() – Executes a prepared Query, mysqli_stmt_fetch() – Fetch results from a prepared statement into the bound variables, mysqli_stmt_bind_param() – Binds variables to a prepared statement as parameters, mysqli_stmt_bind_result() – Binds variables to a prepared statement for result storage mysqli_stmt_close() – Closes a prepared statement.
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