How to query one to many mysql


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How to query one to many mysql

Hi there,

I have a hierarchical database that include 4 tables. Table A is the parent of B, B is Parent of C, C is parent of D. If I want to query everything in D that is associated with A.name, how do I do that? Thanks!

YanYan
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MYSQL_DB_QUERY(3)							 1							 MYSQL_DB_QUERY(3)

mysql_db_query - Selects a database and executes a query on it

SYNOPSIS
Warning This function was deprecated in PHP 5.3.0, and will be removed in the future, along with the entirety of the original MySQL exten- sion. 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: omysqli_select_db(3) then the query o PDO::__construct resource mysql_db_query (string $database, string $query, [resource $link_identifier = NULL]) DESCRIPTION
mysql_db_query(3) selects a database, and executes a query on it. o $database - The name of the database that will be selected. o $query - The MySQL query. Data inside the query should be properly escaped. o $ link_identifier -The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect(3) is assumed. If no such link is found, it will try to create one as if mysql_connect(3) was 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. +--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | This function now throws an E_DEPRECATED notice. | | | | +--------+---------------------------------------------------+ Example #1 mysql_db_query(3) 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 "; echo 'MySQL Error: ' . mysql_error(); exit; } while ($row = mysql_fetch_assoc($result)) { echo $row['foo']; } mysql_free_result($result); ?> 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(3) instead of this function. mysql_query(3), mysql_select_db(3). PHP Documentation Group MYSQL_DB_QUERY(3)

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