首先，将代码保存到一个文件，如：mysql.class.php
其次，在一个常用的文件里调用：比如头部文件header.php,因为我放在根目录所以用下面方式导入其他文件：
require dirname(__FILE__) . 'include/config.php'
//导入类文件
require dirname(__FILE__) . 'include/mysql.class.php'
//定义一个类及初始化数据库类
$db = new mysql($db_host, $db_user, $db_pass, $db_name)
$db_host = $db_user = $db_pass = $db_name = NULL
然后，在test.php文件调用：
require_once dirname(__FILE__) . '/header.php'
使用方法：
$sql = "读取表"
$res = $db->query($sql)
$info = array()//定义数组
while($row=$db->fetchRow($res))
{
$arr['id'] = $row['id']
$arr['title'] = $row['title']
$info[] = $arr
}
可以在显示的地方用：
foreach($info as $i)
{
echo $i['title']."<br />"
}
或是直接使用while
还用另一种调用方式：
$here_area = $db->getRow("select areaid,areaname from {$table}area where areaid='$areaid'")
$here[] = array('name'=>$here_area['areaname'],'id'=>$here_area['areaid'])
测试通过，因为我正在使用.....................................
config.php代码：
<?php
$db_host = "localhost"
$db_name = "test"
$db_user = "root"
$db_pass = ""
$table = "mini_"
$charset = "gb2312"
$dbcharset = "gbk"
?>
mysql.class.php代码：
<?php
class mysql
{
var $link= NULL
//自动执行__construct php5类构建方法，如果PHP4和PHP5同时使用会自动使用PHP5的方法
function __construct($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $quiet = 0)
{
//自动执行时调用mysql函数
$this->mysql($dbhost, $dbuser, $dbpw, $dbname, $pconnect, $quiet)
}
//php4类构建方法，如果没有 __construct 就自动执行此功能
function mysql($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $quiet = 0)
{
if ($quiet)
{
$this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, $quiet)
}
else
{
$this->settings = array(
'dbhost' =>$dbhost,
'dbuser' =>$dbuser,
'dbpw' =>$dbpw,
'dbname' =>$dbname,
'charset' =>$charset,
'pconnect' =>$pconnect
)
}
}
function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $quiet = 0)
{
global $dbcharset
if ($pconnect)
{
if (!($this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)))
{
if (!$quiet)
{
$this->ErrorMsg("Can't pConnect MySQL Server($dbhost)!")
}
return false
}
}
else
{
if (PHP_VERSION >= '4.2')
{
$this->link = @mysql_connect($dbhost, $dbuser, $dbpw, true)
}
else
{
$this->link = @mysql_connect($dbhost, $dbuser, $dbpw)
mt_srand((double)microtime() * 1000000)
}
if (!$this->link)
{
if (!$quiet)
{
$this->ErrorMsg("Can't Connect MySQL Server($dbhost)!")
}
return false
}
}
$this->dbhash = md5($this->root_path . $dbhost . $dbuser . $dbpw . $dbname)
$this->version = mysql_get_server_info($this->link)
if ($this->version >'4.1')
{
if ($dbcharset != 'latin1')
{
mysql_query("SET character_set_connection=$dbcharset, character_set_results=$dbcharset, character_set_client=binary", $this->link)
}
if ($this->version >'5.0.1')
{
mysql_query("SET sql_mode=''", $this->link)
}
}
if ($dbname)
{
if (mysql_select_db($dbname, $this->link) === false )
{
if (!$quiet)
{
$this->ErrorMsg("Can't select MySQL database($dbname)!")
}
return false
}
else
{
return true
}
}
else
{
return true
}
}
function query($sql, $type = '')
{
if ($this->link === NULL)
{
$this->connect($this->settings['dbhost'], $this->settings['dbuser'], $this->settings['dbpw'], $this->settings['dbname'], $this->settings['charset'], $this->settings['pconnect'])
$this->settings = array()
}
if ($this->queryCount++ <= 99)
{
$this->queryLog[] = $sql
}
if ($this->queryTime == '')
{
if (PHP_VERSION >= '5.0.0')
{
$this->queryTime = microtime(true)
}
else
{
$this->queryTime = microtime()
}
}
if (!($query = mysql_query($sql, $this->link)) &&$type != 'SILENT')
{
$this->error_message[]['message'] = 'MySQL Query Error'
$this->error_message[]['sql'] = $sql
$this->error_message[]['error'] = mysql_error($this->link)
$this->error_message[]['errno'] = mysql_errno($this->link)
$this->ErrorMsg()
return false
}
return $query
}
function affected_rows()
{
return mysql_affected_rows($this->link)
}
function num_fields($query)
{
return mysql_num_fields($query)
}
function error()
{
return mysql_error($this->link)
}
function errno()
{
return mysql_errno($this->link)
}
function num_rows($query)
{
return mysql_num_rows($query)
}
function insert_id()
{
return mysql_insert_id($this->link)
}
function fetchRow($query)
{
return mysql_fetch_assoc($query)
}
function fetcharray($query)
{
return mysql_fetch_array($query)
}
function version()
{
return $this->version
}
function close()
{
return mysql_close($this->link)
}
function ErrorMsg($message = '', $sql = '')
{
if ($message)
{
echo "$message\n\n"
}
else
{
echo "<b>MySQL server error report:"
print_r($this->error_message)
}
exit
}
function getCol($sql)
{
$res = $this->query($sql)
if ($res !== false)
{
$arr = array()
while ($row = mysql_fetch_row($res))
{
$arr[] = $row[0]
}
return $arr
}
else
{
return false
}
}
function getOne($sql, $limited = false)
{
if ($limited == true)
{
$sql = trim($sql . ' LIMIT 1')
}
$res = $this->query($sql)
if ($res !== false)
{
$row = mysql_fetch_row($res)
if ($row !== false)
{
return $row[0]
}
else
{
return ''
}
}
else
{
return false
}
}
function getAll($sql)
{
$res = $this->query($sql)
if ($res !== false)
{
$arr = array()
while ($row = mysql_fetch_assoc($res))
{
$arr[] = $row
}
return $arr
}
else
{
return false
}
}
//使用： getRow($sql,true) 如果有true那值是 limit 1,读取一条信息
function getRow($sql, $limited = false)
{
if ($limited == true)
{
$sql = trim($sql . ' LIMIT 1')
}
$res = $this->query($sql)
if ($res !== false)
{
return mysql_fetch_assoc($res)
}
else
{
return false
}
}
}
?>
'database' =>'mysql', 数据库类型'dbserver' =>'localhost', 数据库服务器
'dbuser' =>'root', 连接账号
'dbpass' =>'', 连接密码
'dbname' =>'jspace',数据库名字
'dbcharset' =>'gbk',采用的编码方式
'tablepre' =>'jspace4_',数据库中的表前缀
'cookiepath' =>'/', cookie路径
'cookiedomain' =>'' cookie域
本文所述的是一个在PHP中以mysqli方式连接数据库的一个数据库类实例，该数据库类是从一个PHP的CMS中整理出来的，可实现PHP连接数据库类，MySQLi版，兼容PHP4，对于有针对性需要的朋友可根据此代码进行优化和修改。?
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<?php
#==================================================================================================
# Filename: /db/db_mysqli.php
# Note : 连接数据库类，MySQLi版
#==================================================================================================
#[类库sql]
class db_mysqli
{
var $query_count = 0
var $host
var $user
var $pass
var $data
var $conn
var $result
var $prefix = "qingga
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