mysqli_stmt_prepare
(no version information, might be only in CVS)
mysqli_stmt_prepare
(no version information, might be only in CVS)
stmt->prepare -- Prepare a SQL statement for execution
Description
Procedure style:
bool mysqli_stmt_prepare ( object stmt, string query)
Object oriented style (method)
class stmt {
mixed prepare ( string query)
}
mysqli_stmt_prepare() prepares the SQL query pointed to
by the null-terminated string query. The statement object
has to be allocated by mysqli_stmt_init(). The query must
consist of a single SQL statement.
Note: 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.
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 Defination Language (DDL)
statements.
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.
Return values
Returns TRUE on success or FALSE on failure.
See Also
mysqli_stmt_init(), mysqli_stmt_execute(), mysqli_stmt_fetch(),
mysqli_stmt_bind_param(), mysqli_stmt_bind_result(), mysqli_stmt_close()
Example
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 */
$stmt = mysqli_stmt_init();
if ($stmt = 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);
?>
The above examples would produce the following output:
Amersfoort is in district Utrecht
