mysql_db_querySynopsis
ReturnsQuery handle for successful SELECT, DESCRIBE, EXPLAIN, and SHOW queries; TRUE/FALSE for other queries; FALSE on error Descriptionmysql_db_query() executes query on database using the MySQL server connection referenced by connection . If no connection handle is specified in the connection argument, the last opened connection will be used by default. If no connection is open, mysql_db_query() attempts to connect to a MySQL database by calling mysql_connect() without arguments. The value returned depends on the query made. SELECT, DESCRIBE, EXPLAIN, and SHOW queries return a MySQL result handle if successful or FALSE on failure. Note that the previous types of queries are considered to have failed only if they're malformed. Other query types return TRUE on success and FALSE on failure. NoteThis function sets the database that's queried by calling the mysql_select_db() function. Any subsequent calls to mysql_query() use the specified database unless overridden by another call to mysql_db_query() or a call to mysql_select_db() . An excellent alternative is to use the mysql_query() function with queries that specify the absolute name of the table in the form database.table. For example: See also
ExampleExample 795. Update a database using mysql_db_query() <?php // Connect to the default MySQL server mysql_connect () or die ("Could not connect to the default MySQL server."); // Storing our query in a variable helps us debug more easily // Change all login names to lowercase $query = "UPDATE user SET login = LCASE(login)"; mysql_db_query ($db, $query) or die ("Query '$query' failed with error message: \"" . mysql_error () . '"'); // Display the number of rows changed by the query echo mysql_affected_row (), " login names were modified by query '$query'"; ?> Example 796. Make a SELECT query using mysql_db_query() <?php // Connect to the default MySQL server mysql_connect () or die ("Could not connect to the default MySQL server."); // Storing our query in a variable helps us debug more easily // Find all usernames that contain an upper- or lowercase 'a' $query = "SELECT * FROM user WHERE login LIKE '%a%' ORDER BY login"; $mysql_result = mysql_db_query ($db, $query) or die ("Query '$query' failed with error message: \"" . mysql_error () . '"'); // Display the data returned by the query while ($temp = mysql_fetch_row ($mysql_result)) { echo $temp[0], '<br>'; } ?>
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing
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