ECShop - 数据库操作类

ECShop v2.7.2没有使用一些开源的数据库操作类,比如adodb或者PEAR,而是封装了自己的实现。这样做的好处是实现非常轻量,只有一个文件,27Kb,大大减小了分发包的文件大小。另外,当网站需要做memcached缓存时,也可以很方便的实现。当然,这样做的后果就是数据库的选择非常狭窄,无法实现其它的非MySQL数据库。

ECShop的数据操作类文件是includes/cls_mysql.php,类名是cls_mysql。该类主要提供了下面 一些比较有用的方法:

getAll($sql)和getAllCached($sql, $cached = 'FILEFIRST'):获取所有记录。
getRow($sql, $limited = false)和getRowCached($sql, $cached = 'FILEFIRST'):获取单行记录。
getCol($sqlse)和getColCached($sql, $cached = 'FILEFIRST'):获取某栏位的所有值。
getOne($sql, $limited = false)和getOneCached($sql, $cached = 'FILEFIRST'):获取单个数值。
query($sql):执行数据库查询。
autoExecute($table, $field_values, $mode = 'INSERT', $where = ''):数据库表操作。
现在我们以实例的方式来说明这些方法如何使用。首先,在ecshop/admin目录下新增文件test_mysql.php,文件内容如下:view plaincopy to clipboardprint?
<?php  
 
define('IN_ECS', true);   
define('EC_CHARSET', 'utf-8');  
define('ROOT_PATH', 'D:/Program Files/Zend/Apache2/htdocs/ecshop/');  
define('DATA_DIR', 'data');  
 
$db_host = "localhost:3306";   
$db_name = "ecshop";   
$db_user = "root";   
$db_pass = "";   
 
require('../includes/cls_mysql.php');   
$db = new cls_mysql($db_host, $db_user, $db_pass, $db_name); 
<?php

define('IN_ECS', true);
define('EC_CHARSET', 'utf-8');
define('ROOT_PATH', 'D:/Program Files/Zend/Apache2/htdocs/ecshop/');
define('DATA_DIR', 'data');

$db_host = "localhost:3306";
$db_name = "ecshop";
$db_user = "root";
$db_pass = "";

require('../includes/cls_mysql.php');
$db = new cls_mysql($db_host, $db_user, $db_pass, $db_name);

 

--------------------------------------------------------------------------------


 获取所有记录
getAll方法用来从数据库中获取满足条件的所有记录。getAllCached是它的缓存版本,cache key是该方法的第二个参数,如果缓存有效,直接返回缓存结果,否则重新执行数据库查询。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_getAll();  
 
function test_getAll()  
{  
    global $db;  
      
    $sql = "SELECT user_id, user_name, email FROM ecs_admin_user";  
    $result = $db->getAll($sql);  
    print_r($result);  

test_getAll();

function test_getAll()
{
 global $db;
 
 $sql = "SELECT user_id, user_name, email FROM ecs_admin_user";
 $result = $db->getAll($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
Array  
(  
    [0] => Array  
        (  
            [user_id] => 1  
            [user_name] => admin  
            [email] => [email protected]  
        )  
 
    [1] => Array  
        (  
            [user_id] => 2  
            [user_name] => bjgonghuo1  
            [email] => [email protected]  
        )  
 
    [2] => Array  
        (  
            [user_id] => 3  
            [user_name] => shhaigonghuo1  
            [email] => [email protected]  
        )  
 
    [3] => Array  
        (  
            [user_id] => 4  
            [user_name] => amonest  
            [email] => [email protected]  
        )  
 

Array
(
    [0] => Array
        (
            [user_id] => 1
            [user_name] => admin
            [email] => [email protected]
        )

    [1] => Array
        (
            [user_id] => 2
            [user_name] => bjgonghuo1
            [email] => [email protected]
        )

    [2] => Array
        (
            [user_id] => 3
            [user_name] => shhaigonghuo1
            [email] => [email protected]
        )

    [3] => Array
        (
            [user_id] => 4
            [user_name] => amonest
            [email] => [email protected]
        )

)

 

--------------------------------------------------------------------------------


 获取单行记录
getRow方法用来从数据库中获取满足条件的单行记录,或者说是第一条记录。getRowCached是它的缓存版本,cache key是该方法的第二个参数,如果缓存有效,直接返回缓存结果,否则重新执行数据库查询。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_getRow();  
 
function test_getRow()  
{  
    global $db;  
      
    $sql = "SELECT user_id, user_name, email FROM ecs_admin_user LIMIT 1";  
    $result = $db->getRow($sql);  
    print_r($result);  

test_getRow();

function test_getRow()
{
 global $db;
 
 $sql = "SELECT user_id, user_name, email FROM ecs_admin_user LIMIT 1";
 $result = $db->getRow($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
Array  
(  
    [user_id] => 1  
    [user_name] => admin  
    [email] => [email protected]  

Array
(
    [user_id] => 1
    [user_name] => admin
    [email] => [email protected]
)

 

--------------------------------------------------------------------------------


 获取某栏位的所有值
getCol方法用来从数据库中获取满足条件的某个栏位的所有值。getColCached是它的缓存版本,cache key是该方法的第二个参数,如果缓存有效,直接返回缓存结果,否则重新执行数据库查询。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_getCol();  
 
function test_getCol()  
{  
    global $db;  
      
    $sql = "SELECT email FROM ecs_admin_user";  
    $result = $db->getCol($sql);  
    print_r($result);  

test_getCol();

function test_getCol()
{
 global $db;
 
 $sql = "SELECT email FROM ecs_admin_user";
 $result = $db->getCol($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
Array  
(  
    [0] => [email protected]  
    [1] => [email protected]  
    [2] => [email protected]  
    [3] => [email protected]  

Array
(
    [0] => [email protected]
    [1] => [email protected]
    [2] => [email protected]
    [3] => [email protected]
)
 

 

--------------------------------------------------------------------------------


 获取单个值
getOne方法用来从数据库中获取满足条件的单个值。getOneCached是它的缓存版本,cache key是该方法的第二个参数,如果缓存有效,直接返回缓存结果,否则重新执行数据库查询。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_getOne();  
 
function test_getOne()  
{  
    global $db;  
      
    $sql = "SELECT email FROM ecs_admin_user WHERE user_id = 4";  
    $result = $db->getOne($sql);  
    print_r($result);  

test_getOne();

function test_getOne()
{
 global $db;
 
 $sql = "SELECT email FROM ecs_admin_user WHERE user_id = 4";
 $result = $db->getOne($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
[email protected] 
[email protected]

 

--------------------------------------------------------------------------------


 执行数据库查询
query方法用来执行数据库查询,例如INSERT,UPDATE,DELETE等。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_query();  
 
function test_query()  
{  
    global $db;  
      
    $sql = "UPDATE ecs_admin_user SET todolist = '你有一封新邮件!' WHERE user_id = 4";  
    $db->query($sql);  
    $sql = "SELECT todolist FROM ecs_admin_user WHERE user_id = 4";  
    $result = $db->getOne($sql);  
    print_r($result);  

test_query();

function test_query()
{
 global $db;
 
 $sql = "UPDATE ecs_admin_user SET todolist = '你有一封新邮件!' WHERE user_id = 4";
 $db->query($sql);
 $sql = "SELECT todolist FROM ecs_admin_user WHERE user_id = 4";
 $result = $db->getOne($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
你有一封新邮件! 
你有一封新邮件!

 

--------------------------------------------------------------------------------


 数据库表操作
autoExecute方法用来简化对数据表的INSERT和UPDATE。

将下面的代码加到test_mysql.php的最后:

view plaincopy to clipboardprint?
test_autoExecute();  
 
function test_autoExecute()  
{  
    global $db;  
      
    $table = "ecs_role";  
    $field_values = array("role_name" => "总经理办", "role_describe" => "总经理办", "action_list" => "all");  
    $db->autoExecute($table, $field_values, "INSERT");  
    // 执行的SQL:INSERT INTO ecs_role (role_name, action_list, role_describe) VALUES ('总经理办', 'all', '总经理办')  
 
    $role_id = $db->insert_id(); // 新记录的ID:5  
      
    $field_values = array("action_list" => "goods_manage");  
    $db->autoExecute($table, $field_values, "UPDATE", "role_id = $role_id");  
    // 执行的SQL:UPDATE ecs_role SET action_list = 'goods_manage' WHERE role_id = 5  
 
    $sql = "SELECT action_list FROM ecs_role WHERE role_id = $role_id";  
    $result = $db->getOne($sql);  
    print_r($result);  

test_autoExecute();

function test_autoExecute()
{
 global $db;
 
 $table = "ecs_role";
 $field_values = array("role_name" => "总经理办", "role_describe" => "总经理办", "action_list" => "all");
 $db->autoExecute($table, $field_values, "INSERT");
 // 执行的SQL:INSERT INTO ecs_role (role_name, action_list, role_describe) VALUES ('总经理办', 'all', '总经理办')

 $role_id = $db->insert_id(); // 新记录的ID:5
 
 $field_values = array("action_list" => "goods_manage");
 $db->autoExecute($table, $field_values, "UPDATE", "role_id = $role_id");
 // 执行的SQL:UPDATE ecs_role SET action_list = 'goods_manage' WHERE role_id = 5

 $sql = "SELECT action_list FROM ecs_role WHERE role_id = $role_id";
 $result = $db->getOne($sql);
 print_r($result);
}

修改以后的test_mysql.php执行结果如下:

view plaincopy to clipboardprint?
goods_manage 
goods_manage

 

本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/amonest/archive/2011/04/15/6326041.aspx

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