MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysql_db_query
Selects a database and executes a query on it
This function was deprecated in PHP 5.3.0, and it and the entire original MySQL extension was removed in PHP 7.0.0. Instead, use either the actively developed MySQLi or PDO_MySQL extensions. See also the MySQL: choosing an API guide and its related FAQ entry for additional information. Alternatives to this function include:
mysqli_select_db then the query |
PDO::__construct
|
resource|bool mysql_db_query(string database,
string query,
resource link_identifier= =NULL);
mysql_db_query
selects a database, and executes a query on it.
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
had been called with no arguments. If no connection is
found or established, an E_WARNING
level error is generated.
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.
Example 6.12 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); ?>
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.
mysql_query
|
mysql_select_db
|