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Homephp教程php手册一个利用PHP语言读取数据库数据的例子

  在学习《十天学会PHP》的过程中,当看到关于数据库连接的问题时,由于知识的不足,遇到了困难。于是找朋友帮忙写了个PHP小程序,在这里贴出来,希望对大家能有帮助。注释是我自己写的。

这段代码的功能是:

连接到一个 url 地址为localhost 、 端口为 3306 的mysql服务器上。mysql服务器的帐号是"root",密码是"9999"。mysql 服务器上有一个数据库 ok , 数据库里有一个表 abc。表 abc 一共为两列,列名分别是 "id" 和 "name" ,将 abc 里的所有数据读出来。

$dbh = @mysql_connect("localhost:3306","root","9999");
 
 /* 定义变量dbh , mysql_connect()函数的意思是连接mysql数据库, "@"的意思是屏蔽报错 */

if(!$dbh){die("error");}

/* die()函数的意思是将括号里的字串送到浏览器并中断PHP程式 (Script)。括号里的参数为欲送出的字串。 */

@mysql_select_db("ok", $dbh);

/* 选择mysql服务器里的一个数据库,这里选的数据库名为 ok */

$q = "SELECT * FROM abc";

/* 定义变量q, "SELECT * FROM abc"是一个SQL语句,意思是读取表abc中的数据 */

?>





$rs = mysql_query($q, $dbh);

/* 定义变量 rs ,函数mysql_query()的意思是:送出 query 字串供 MySQL 做相关的处理或者执行.由于php是从右往左执行的,所以,rs的值是服务器运行mysql_query()函数后返回的值 */

if(!$rs){die("Valid result!");}

echo "

";

echo "

";

while($row = mysql_fetch_row($rs)) echo "

";

/* 定义量变(数组)row,并利用while循环,把数据一一写出来.
函数mysql_fetch_row()的意思是:将查询结果$rs单列拆到阵列变数中.
$row[0] 和 $row[1] 的位置可以换*/

echo "

ID Name
$row[0] $row[1]
";

?>





$rs = mysql_query($q, $dbh);

while($row = mysql_fetch_object($rs)) echo "$row->id $row->name
";

/* id和name可以换位置 */

?>





$rs = mysql_query($q, $dbh);

while($row = mysql_fetch_array($rs)) echo "$row[id]  $row[name]
";

/* id和name可以换位置 */

?>
 

@mysql_close($dbh);

/* 关闭到mysql数据库的连接 */

?>



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