mysqli_query
(PHP 5)
mysqli_query
(no version information, might be only in CVS)
mysqli->query() -- Performs a query on the database
Description
Procedural style:
mixed
mysqli_query ( mysqli link, string query [, int resultmode] )
Object oriented style (method):
class
mysqli {
mixed
query ( string query [, int resultmode] )
}
Performs a query against the database.
Functionally, using this function is identical to calling
mysqli_real_query() followed either by
mysqli_use_result() or
mysqli_store_result().
Parameters
linkProcedural style only: A link identifier
returned by mysqli_connect() or mysqli_init()
query
The query string.
resultmode
Either the constant MYSQLI_USE_RESULT or
MYSQLI_STORE_RESULT depending on the desired
behavior. By default, MYSQLI_STORE_RESULT is used.
If you use MYSQLI_USE_RESULT all subsequent calls
will return error Commands out of sync unless you
call mysqli_free_result()
Return Values
Returns TRUE on success or FALSE on failure. For SELECT, SHOW, DESCRIBE or
EXPLAIN mysqli_query() will return
a result object.
Examples
Example 1. Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", $result->num_rows);
/* free result set */
$result->close();
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!$mysqli->query("SET @a:='this will not work'")) {
printf("Error: %s\n", $mysqli->error);
}
$result->close();
}
$mysqli->close();
?>
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Example 2. Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */
mysqli_free_result($result);
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Error: %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
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The above example will output:
Table myCity successfully created.
Select returned 10 rows.
Error: Commands out of sync; You can't run this command now |