php入门学习知识点一 PHP与MYSql连接与查询
一、连接数据库
1、 mysql_connect: 开启 MySQL 链接
mysql_connect('主机','用户名','密码')
2、 mysql_select_db: 打开一个数据库
mysql_select_db('数据库名',$链接标识符) //链接标识符不填写则默认为上一次打开的连接
3、 mysql_query("set names 'GBK'") 解决中文乱码问题;
mysql_query("set names '编码(utf8或GBK)' ") //UTF8不能有“-”
二、查询数据
1、mysql_query (SQL语句 ,连接标识符);
$sql="Select * FROM Test "
$result=mysql_query($sql) //连接标识符默认为上一次打开的链接
//获取错误信息
$result=@mysql_query($sql) or die(mysql_error())
2、获取查询到的结果
a、 mysql_fetch_row($result);
$row=mysql_fetch_row($result);
echo $row[0];
b、 mysql_fetch_array($result);
$row=mysql_fetch_array($result);
echo $row[0];
echo $row['key'];
说明:mysql_fetch_array和mysql_fetch_row功能基本相同,只不过它除了可以用从0开始的偏移量作索引,还可以用域名作索引。
值返回下一行的所有域值,并将其保存至一个数组中,没有行时返回false。

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