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:
[php] view plain copy print ?
- <?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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
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:
[php] view plain copy print ?
- 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:
[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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- 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:
[php] view plain copy print ?
- goods_manage