|
|
|
|
| mysqli_query |
 |
|
|
| 글쓴이 : 손님
날짜 : 06-01-21 08:02
조회 : 929
|
|
 http://cafe.naver.com/q69/11486 (148) | |
|
|
|
mysqli_query
(PHP 5) mysqli_query
(no version information, might be only in CVS) mysqli->query -- Performs a query on the database
Descript-xion
Procedural style: mixed mysqli_query ( object link, string query [, int resultmode])
Object oriented style (method): class mysqli { mixed query ( string query) }
The mysqli_query() function is used to simplify the act of performing a query against the database represented by the link parameter.
Functionally, using this function is identical to calling mysqli_real_query() followed either by mysqli_use_result() or mysqli_store_result() where query is the query string itself and resultmode is either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, if the resultmode is not provided MYSQLI_STORE_RESULT is used.
If you execute mysqli_query() with resultmode MYSQLI_USE_RESULT all subsequent calls will return error Commands out of sync unless you call mysqli_free_result().
Return values
성공일 경우 TRUE를, 실패일 경우 FALSE를 반환합니다. For SELECT, SHOW, DESCRIBE or EXPLAIN mysqli_query() will return a result object.
Example
예 1. Object oriented style
|
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", $result->num_rows);
$result->close();
}
if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
if (!$mysqli->query("SET @a:='this will not work'")) {
printf("Error: %s\n", $mysqli->error);
}
$result->close();
}
$mysqli->close();
?>
| |
예 2. Procedural style
|
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Error: %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>
| |
The above examples would produce the following output:
Table myCity successfully created.
Select returned 10 rows.
Error: Commands out of sync; You can't run this command now |
Beeners08-Jan-2006 05:16
Stored Procedures.
Use mysqli_query to call a stored procedure that returns a result set.
Here is a short example:
<?php
$mysqli = new mysqli(DBURI,DBUSER,DBPASS,DBNAME);
if (mysqli_connect_errno())
{
printf("Connection failed: %s\n", mysqli_connect_error());
exit();
}
$SQL = "CALL my_procedure($something)";
if ( ($result = $mysqli->query($SQL))===false )
{
printf("Invalid query: %s\nWhole query: %s\n", $mysqli->error, $SQL);
exit();
}
while ($myrow = $result->fetch_array(MYSQLI_ASSOC))
{
$aValue[]=$myrow["a"];
$bValue[]=$myrow["b"];
}
$result->close();
$mysqli->close();
?>
I hope this saves someone some time.
ole_v2 at dsl dot pipex dot com26-Aug-2005 12:22
SENDING MULTIPLE QUERIES
use mysqli_multi_query()
This is ilegal:
<?
$result = mysqli_query($db,'SELECT * FROM sometable; SHOW DATABASES;'); if ($result) {
}
?>
andrey at php dot net07-Aug-2005 04:03
WARNING: This function was buggy on 64bit machines till 5.0.5. Affected versions 5.0.0-5.0.4. The problem appears when a value for the third parameter is passed - this will lead to instant FALSE returned by the function. Therefore if you need to use unbuffered query don't use this function with the aforementioned versions but you mysqli_real_query() and mysqli_use_result().
If you have the rights to patch you PHP installation the fix is easy:
In file ext/mysqli/myslqi_nonapi.c, function PHP_FUNCTION(mysqli_query)
change
unsigned int resultmode=0;
to
unsigned long resultmode=0;
Thanks!
hunreal at gmail dot com14-Aug-2004 06:24
Use difference collation/character for connect, result.
You can set the collation before your query.
E.g. want to set the collation to utf8_general_ci
you can send the query "SET NAMES 'utf8'" first
<?php
$mysqli=new mysqli('localhost', 'root', 'password', 'test');
$mysqli->query("SET NAMES 'utf8'");
$q=$mysqli->query("select * from test");
while($r=$q->fetch_assoc()) {
print_r($r);
}
?>
There are many variables about character settings.
By running sql command, SHOW VARIABLES LIKE 'char%';
There are some variables control the character usage.
character_set_client
character_set_connection
character_set_database
character_set_results
character_set_server
character_set_system
Also SET NAMES can repalce with one or some settings like SET character_set_results='utf8';
|
|
|
|
