mysqli_stmt->param_count
If you wrap the placeholders with quotation marks you will experience warnings like "Number of variables doesn't match number of parameters in prepared statement" (at least with INSERT Statements).
mysqli_stmt::prepare
mysqli_stmt_prepare
(PHP 5)
mysqli_stmt::prepare -- mysqli_stmt_prepare — Prepare a SQL statement for execution
Descrierea
Object oriented style (method)
Procedure style:
bool mysqli_stmt_prepare
( mysqli_stmt $stmt
, string $query
)
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.
Parametri
- stmt
-
Numai stilul procedural: Un identificator al declaraţiei întors de 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.
Notă: You should not add a terminating semicolon or \g to the statement.
Notă: 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.
Valorile întroarse
Întoarce valoarea TRUE în cazul succesului sau FALSE în cazul eşecului.
Exemple
Example #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();
?>
Example #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);
?>
Exemplul de mai sus va afişa:
Amersfoort is in district Utrecht
add a note
User Contributed Notesmysqli_stmt::prepare
kontakt at arthur minus schiwon dot de
16-Jun-2008 07:22
16-Jun-2008 07:22
mhradek AT gmail.com
15-May-2008 04:06
15-May-2008 04:06
A particularly helpful adaptation of this function and the call_user_func_array function:
// $params is sent as array($val=>'i', $val=>'d', etc...)
function db_stmt_bind_params($stmt, $params)
{
$funcArg[] = $stmt;
foreach($params as $val=>$type)
{
$funcArg['type'] .= $type;
$funcArg[] = $val;
}
return call_user_func_array('mysqli_stmt_bind_param', $funcArgs);
}
Thanks to 'sned' for the code.