
我们可以使用MySQL JOIN的语法将两个表连接到PHP函数mysql_query()中。这个函数用于执行SQL命令,然后可以使用另一个PHP函数mysql_fetch_array()来获取所有选择的数据。
为了说明这一点,我们有以下示例−
在这个示例中,我们使用了两个具有以下数据的MySQL表−
mysql> SELECT * FROM tcount_tbl; +-----------------+----------------+ | tutorial_author | tutorial_count | +-----------------+----------------+ | mahran | 20 | | mahnaz | NULL | | Jen | NULL | | Gill | 20 | | John Poul | 1 | | Sanjay | 1 | +-----------------+----------------+ 6 rows in set (0.01 sec) mysql> SELECT * from tutorials_tbl; +-------------+----------------+-----------------+-----------------+ | tutorial_id | tutorial_title | tutorial_author | submission_date | +-------------+----------------+-----------------+-----------------+ | 1 | Learn PHP | John Poul | 2007-05-24 | | 2 | Learn MySQL | Abdul S | 2007-05-24 | | 3 | JAVA Tutorial | Sanjay | 2007-05-06 | +-------------+----------------+-----------------+-----------------+ 3 rows in set (0.00 sec)
现在,以下是一个PHP脚本,它将连接表格以选择来自表格tutorials_tbl的所有作者,并将从 tcount_tbl中选择相应数量的教程。
<?php
$dbhost = 'localhost:3036';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn ) {
die('Could not connect: ' . mysql_error());
}
$sql = 'SELECT a.tutorial_id, a.tutorial_author, b.tutorial_count
FROM tutorials_tbl a, tcount_tbl b
WHERE a.tutorial_author = b.tutorial_author';
mysql_select_db('TUTORIALS');
$retval = mysql_query( $sql, $conn );
if(! $retval ) {
die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval, MYSQL_ASSOC)) {
echo "Author:{$row['tutorial_author']} <br> ".
"Count: {$row['tutorial_count']} <br> ".
"Tutorial ID: {$row['tutorial_id']} <br> ".
"--------------------------------<br>";
}
echo "Fetched data successfully</p><p>";
mysql_close($conn);
?>以上就是如何编写PHP脚本,使用MySQL JOINS在其中连接两个MySQL表格?的详细内容,更多请关注php中文网其它相关文章!
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