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php数据库连接初始化 php 数据库连接

php opencart怎么进行数据库操作

1,根目录下config.php中定义了数据库信息:

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// DB

define('DB_DRIVER', 'mysqli');

define('DB_HOSTNAME', 'localhost');

define('DB_USERNAME', 'root');

define('DB_PASSWORD', 'qqqq');

define('DB_DATABASE', 'qqqq');

define('DB_PORT', '3306');

define('DB_PREFIX', 'oc_');

2,systemlibrary文件夹下db.php中定义了DB类,数据库的连接方法

$this-db = new $class($hostname, $username, $password, $database, $port);

3,index.php中初始化数据库连接

$db = new DB(DB_DRIVER, DB_HOSTNAME, DB_USERNAME, DB_PASSWORD, DB_DATABASE, DB_PORT);

4,controller中调用model层定义的查询函数

$layout_id = $this-model_catalog_category-getCategoryLayoutId(end($path));

5,model层getCategoryLayoutId函数中返回查询sql结果

$query = $this-db-query("SELECT * FROM " . DB_PREFIX . "category_to_layout WHERE category_id = '" . (int)$category_id . "' AND store_id = '" . (int)$this-config-get('config_store_id') . "'");

怎么将php与数据库连接

php链接mysql必备条件:

已安装mysql数据库;

检查php环境是否已开启mysql扩展(一般情况下是开启的);

检查方法:a.使用phpinfo();函数,看有没有mysql项;b.打开php.ini文件,检查php_mysql.dll前分号是否已取掉。

php链接代码如下:

?php

//设置编码格式

header("Content-type:text/html;charset=utf-8");

//定义数据库主机地址

$host="localhost";

//定义mysql数据库登录用户名

$user="root";

//定义mysql数据库登录密码

$pwd="";

//链接数据库

$conn = mysql_connect($host,$user,$pwd);

//对连接进行判断

if(!$conn){

die("数据库连接失败!".mysql_errno());

}else{

echo "数据库连接成功!";

}

?

php 连接数据库类

我也刚刚学PHP,正在研究中,虽然你只给10分........

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 "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,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;

}

}

}

?


名称栏目:php数据库连接初始化 php 数据库连接
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