mysqli::prepare
mysqli::real_connect
MySQLi
PHP Manual

# mysqli::query

# mysqli_query

(PHP 5)

mysqli::query -- mysqli_query — Performs a query on the database

### 설명

Object oriented style (method):

mixed mysqli::query ( string `$query` [, int `$resultmode` ] )

Procedural style:

mixed mysqli_query ( mysqli `$link` , string `$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().

### 인수

`link`

  순차 형식 전용: mysqli_connect()나 mysqli_init()가 반환한 연결 식별자.

`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()

  With `MYSQLI_ASYNC` (available with mysqlnd), it is possible to perform query asynchronously. mysqli_poll() is then used to get results from such queries.

### 반환값

성공할 경우 `TRUE`를, 실패할 경우 `FALSE`를 반환합니다. For SELECT, SHOW, DESCRIBE or EXPLAIN mysqli_query() will return a result object.

### 변경점

버전 | 설명
--- | ---
5.3.0 | Added the ability of async queries.

### 예제

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();
?>`

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);
?>`

위 예제의 출력:

    Table myCity successfully created.
    Select returned 10 rows.
    Error: Commands out of sync;  You can't run this command now

### 참고

- mysqli_real_query() - Execute an SQL query
- mysqli_multi_query() - Performs a query on the database
- mysqli_free_result() - Frees the memory associated with a result

mysqli::prepare
mysqli::real_connect
MySQLi
PHP Manual