mysqli_stmt_store_result
(PHP 5)
mysqli_stmt_store_result
(no version information, might be only in CVS)
mysqli_stmt->store_result -- Transfers a result set from a prepared statement
Description
Procedural style:
bool
mysqli_stmt_store_result ( mysqli_stmt stmt )
Object oriented style (method):
class
mysqli_stmt {
bool
store_result ( void )
}
You must call mysqli_stmt_store_result() for every query that
successfully produces a result set (SELECT, SHOW, DESCRIBE, EXPLAIN),
and only if you want to buffer the complete result set by the client,
so that the subsequent mysqli_stmt_fetch() call returns buffered data.
注:
It is unnecessary to call mysqli_stmt_store_result() for other queries,
but if you do, it will not harm or cause any notable performance in all cases.
You can detect whether the query produced a result set by checking if
mysqli_stmt_result_metadata() returns NULL.
返回值
如果成功则返回 TRUE,失败则返回 FALSE。
例
例子 1. Object oriented style
<?php /* Open a connection */ $mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); }
$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20"; if ($stmt = $mysqli->prepare($query)) {
/* execute query */ $stmt->execute();
/* store result */ $stmt->store_result();
printf("Number of rows: %d.\n", $stmt->num_rows);
/* free result */ $stmt->free_result();
/* close statement */ $stmt->close(); }
/* close connection */ $mysqli->close(); ?>
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例子 2. Procedural style
<?php /* Open a connection */ $link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); }
$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20"; if ($stmt = mysqli_prepare($link, $query)) {
/* execute query */ mysqli_stmt_execute($stmt);
/* store result */ mysqli_stmt_store_result($stmt);
printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));
/* free result */ mysqli_stmt_free_result($stmt);
/* close statement */ mysqli_stmt_close($stmt); }
/* close connection */ mysqli_close($link); ?>
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上例将输出: