常規(guī)方式
成都創(chuàng)新互聯(lián)主營(yíng)離石網(wǎng)站建設(shè)的網(wǎng)絡(luò)公司,主營(yíng)網(wǎng)站建設(shè)方案,app軟件開發(fā),離石h5成都微信小程序搭建,離石網(wǎng)站營(yíng)銷推廣歡迎離石等地區(qū)企業(yè)咨詢
常規(guī)方式就是按部就班的讀取文件了。其余的話和上述方案一致。
// 讀取配置文件內(nèi)容
$handle = fopen("filepath", "r"); ? ? ? ? ? ?$content = fread($handle, filesize("filepath"));123
PHP解析XML
上述兩種讀取文件,其實(shí)都是為了PHP解析XML來做準(zhǔn)備的。關(guān)于PHP解析XML的方式的博客有很多。方式也有很多,像simplexml,XMLReader,DOM啦等等。但是對(duì)于比較小型的xml配置文件,simplexml就足夠了。
配置文件
?xml version="1.0" encoding="UTF-8" ?mysql
!-- 為防止出現(xiàn)意外,請(qǐng)按照此標(biāo)準(zhǔn)順序書寫.其實(shí)也無所謂了 --
hostlocalhost/host
userroot/user
password123456/password
dbtest/db
port3306/port/mysql12345678910
解析
?php/**
* 作為解析XML配置文件必備工具
*/class XMLUtil {
public static $dbconfigpath = "./db.config.xml"; ? ?public static function getDBConfiguration() {
$dbconfig = array (); ? ? ? ?try { ? ? ? ? ? ?// 讀取配置文件內(nèi)容
$handle = fopen(self::$dbconfigpath, "r"); ? ? ? ? ? ?$content = fread($handle, filesize(self::$dbconfigpath)); ? ? ? ? ? ?// 獲取xml文檔根節(jié)點(diǎn),進(jìn)而獲取相關(guān)的數(shù)據(jù)庫信息
$mysql = simplexml_load_string($content); ? ? ? ? ? ?// 將獲取到的xml節(jié)點(diǎn)信息賦值給關(guān)聯(lián)數(shù)組,方便接下來的方法調(diào)用
$dbconfig['host'] = $mysql-host; ? ? ? ? ? ?$dbconfig['user'] = $mysql-user; ? ? ? ? ? ?$dbconfig['password'] = $mysql-password; ? ? ? ? ? ?$dbconfig['db'] = $mysql-db; ? ? ? ? ? ?$dbconfig['port'] = $mysql-port; ? ? ? ? ? ?// 將配置信息以關(guān)聯(lián)數(shù)組的形式返回
return $dbconfig;
} catch ( Exception $e ) { ? ? ? ? ? ?throw new RuntimeException ( "mark讀取數(shù)據(jù)庫配置文件信息出錯(cuò)!/markbr /" );
} ? ? ? ?return $dbconfig;
}
}1234567891011121314151617181920212223242526272829
數(shù)據(jù)庫連接池
對(duì)于PHP程序而言,優(yōu)化永無止境。而數(shù)據(jù)庫連接池就在一定程度上起到了優(yōu)化的作用。其使得對(duì)用戶的每一個(gè)請(qǐng)求而言,無需每次都像數(shù)據(jù)庫申請(qǐng)鏈接資源。而是通過已存在的數(shù)據(jù)庫連接池中的鏈接來返回,從時(shí)間上,效率上,都是一個(gè)大大的提升。
于是,這里簡(jiǎn)單的模擬了一下數(shù)據(jù)庫連接池的實(shí)現(xiàn)。核心在于維護(hù)一個(gè)“池”。
從池子中取,用畢,歸還給池子。
?php/**x
* ?PHP中的數(shù)據(jù)庫 工具類設(shè)計(jì)
* ?郭璞
* ?2016年12月23日
*
**/class DbHelper { ? ?private $dbconfig; ? ?private $dbpool; ? ?public $poolsize; ? ?public function __construct($poolsize = 20) { ? ? ? ?if (! file_exists ( "./utils.php" )) { ? ? ? ? ? ?throw new RuntimeException ( "markutils.php文件丟失,無法進(jìn)行配置文件的初始化操作!/markbr /" );
}else {
require './utils.php';
} ? ? ? ?// 初始化 配置文件信息
$this-dbconfig = XMLUtil::getDBConfiguration (); ? ? ? ?// 準(zhǔn)備好數(shù)據(jù)庫連接池“偽隊(duì)列”
$this-poolsize = $poolsize;
$this-dbpool = array (); ? ? ? ?for($index = 1; $index = $this-poolsize; $index ++) {
$conn = mysqli_connect ( $this-dbconfig ['host'], $this-dbconfig ['user'], $this-dbconfig ['password'], $this-dbconfig ['db'] ) or die ( "mark連接數(shù)據(jù)庫失?。?markbr /" );
array_push ( $this-dbpool, $conn );
}
} ? ?/**
* 從數(shù)據(jù)庫連接池中獲取一個(gè)數(shù)據(jù)庫鏈接資源
*
* @throws ErrorException
* @return mixed
*/
public function getConn() { ? ? ? ?if (count ( $this-dbpool ) = 0) { ? ? ? ? ? ?throw new ErrorException ( "mark數(shù)據(jù)庫連接池中已無鏈接資源,請(qǐng)稍后重試!/mark" );
} else { ? ? ? ? ? ?return array_pop ( $this-dbpool );
}
} ? ?/**
* 將用完的數(shù)據(jù)庫鏈接資源放回到數(shù)據(jù)庫連接池
*
* @param unknown $conn
* @throws ErrorException
*/
public function release($conn) { ? ? ? ?if (count ( $this-dbpool ) = $this-poolsize) { ? ? ? ? ? ?throw new ErrorException ( "mark數(shù)據(jù)庫連接池已滿/markbr /" );
} else {
array_push ( $this-dbpool, $conn );
}
}
}
我也剛剛學(xué)PHP,正在研究中,雖然你只給10分........
首先,將代碼保存到一個(gè)文件,如:mysql.class.php
其次,在一個(gè)常用的文件里調(diào)用:比如頭部文件header.php,因?yàn)槲曳旁诟夸浰杂孟旅娣绞綄?dǎo)入其他文件:
require dirname(__FILE__) . 'include/config.php';
//導(dǎo)入類文件
require dirname(__FILE__) . 'include/mysql.class.php';
//定義一個(gè)類及初始化數(shù)據(jù)庫類
$db = new mysql($db_host, $db_user, $db_pass, $db_name);
$db_host = $db_user = $db_pass = $db_name = NULL;
然后,在test.php文件調(diào)用:
require_once dirname(__FILE__) . '/header.php';
使用方法:
$sql = "讀取表";
$res = $db-query($sql);
$info = array();//定義數(shù)組
while($row=$db-fetchRow($res))
{
$arr['id'] = $row['id'];
$arr['title'] = $row['title'];
$info[] = $arr;
}
可以在顯示的地方用:
foreach($info as $i)
{
echo $i['title']."br /";
}
或是直接使用while
還用另一種調(diào)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']);
測(cè)試通過,因?yàn)槲艺谑褂?....................................
config.php代碼:
?php
$db_host = "localhost";
$db_name = "test";
$db_user = "root";
$db_pass = "";
$table = "mini_";
$charset = "gb2312";
$dbcharset = "gbk";
?
mysql.class.php代碼:
?php
class mysql
{
var $link = NULL;
//自動(dòng)執(zhí)行__construct php5類構(gòu)建方法,如果PHP4和PHP5同時(shí)使用會(huì)自動(dòng)使用PHP5的方法
function __construct($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $quiet = 0)
{
//自動(dòng)執(zhí)行時(shí)調(diào)用mysql函數(shù)
$this-mysql($dbhost, $dbuser, $dbpw, $dbname, $pconnect, $quiet);
}
//php4類構(gòu)建方法,如果沒有 __construct 就自動(dòng)執(zhí)行此功能
function mysql($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 "$message\n\n";
}
else
{
echo "bMySQL server error report:";
print_r($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,讀取一條信息
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;
}
}
}
?
做成單例模式,就可以在所有的類中使用你的數(shù)據(jù)庫操作類了。