mysql_db_query
(PHP 4, PHP 5)
mysql_db_query — Selects a database and executes a query on it
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
- mysqli_select_db() then the query
- PDO::__construct()
Description
$database
, string $query
[, resource $link_identifier = NULL
] )mysql_db_query() selects a database, and executes a query on it.
This function has been DEPRECATED as of PHP 5.3.0. Relying on this feature is highly discouraged.
Parameters
-
database -
The name of the database that will be selected.
-
query -
The MySQL query.
Data inside the query should be properly escaped.
-
link_identifier -
The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If no connection is found or established, an
E_WARNINGlevel error is generated.
Return Values
Returns a positive MySQL result resource to the query result,
or FALSE on error. The function also returns TRUE/FALSE for
INSERT/UPDATE/DELETE
queries to indicate success/failure.
Changelog
| Version | Description |
|---|---|
| 5.3.0 | This function now throws an E_DEPRECATED notice. |
| 4.0.6 | This function is deprecated, do not use this function. Use mysql_select_db() and mysql_query() instead. |
Examples
Example #1 mysql_db_query() alternative example
<?php
if (!$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')) {
echo 'Could not connect to mysql';
exit;
}
if (!mysql_select_db('mysql_dbname', $link)) {
echo 'Could not select database';
exit;
}
$sql = 'SELECT foo FROM bar WHERE id = 42';
$result = mysql_query($sql, $link);
if (!$result) {
echo "DB Error, could not query the database\n";
echo 'MySQL Error: ' . mysql_error();
exit;
}
while ($row = mysql_fetch_assoc($result)) {
echo $row['foo'];
}
mysql_free_result($result);
?>
Notes
Note:
Be aware that this function does NOT switch back to the database you were connected before. In other words, you can't use this function to temporarily run a sql query on another database, you would have to manually switch back. Users are strongly encouraged to use the database.table syntax in their sql queries or mysql_select_db() instead of this function.
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- MySQL Drivers and Plugins
- Оригинальное API MySQL
- mysql_affected_rows
- mysql_client_encoding
- mysql_close
- mysql_connect
- mysql_create_db
- mysql_data_seek
- mysql_db_name
- mysql_db_query
- mysql_drop_db
- mysql_errno
- mysql_error
- mysql_escape_string
- mysql_fetch_array
- mysql_fetch_assoc
- mysql_fetch_field
- mysql_fetch_lengths
- mysql_fetch_object
- mysql_fetch_row
- mysql_field_flags
- mysql_field_len
- mysql_field_name
- mysql_field_seek
- mysql_field_table
- mysql_field_type
- mysql_free_result
- mysql_get_client_info
- mysql_get_host_info
- mysql_get_proto_info
- mysql_get_server_info
- mysql_info
- mysql_insert_id
- mysql_list_dbs
- mysql_list_fields
- mysql_list_processes
- mysql_list_tables
- mysql_num_fields
- mysql_num_rows
- mysql_pconnect
- mysql_ping
- mysql_query
- mysql_real_escape_string
- mysql_result
- mysql_select_db
- mysql_set_charset
- mysql_stat
- mysql_tablename
- mysql_thread_id
- mysql_unbuffered_query
Коментарии
/* mmm, it seems that the example don't show the function mysql_db_query, but mysql_query.
Lets see it properly done:
*/
// on this one, we connect to database and recover some rows
<?php
bd=mysql_connect("MySQL_HOST","Admin","******");
if(!$bd)
{
die("Error, connection failed");
}
else
{
$select = mysql_db_query("Hollywood","SELECT * FROM movies");
while($object=mysql_fetch_object($select))
{
echo "Id Movie: ".$object->Id.".";
echo "Title: ".$object->Title.".";
echo "Director: ".$object->Director.".";
}
}
mysql_close($bd);
?>
// on this one, we connect to database and execute a sentence (INSERT/UPDATE/DELETE)
<?php
$id = $_POST["IdMovie"];
$title = $_POST["TitleMovie"];
bd=mysql_connect("MySQL_HOST","Admin","******");
if(!$bd)
{
die("Error, connection failed.");
}
else
{
if(!mysql_db_query("Hollywood","UPDATE movies SET Title='$title' WHERE Id='$id'"))
{
die("Error, movie not updated.");
}
}
mysql_close($bd);
?>