數據庫操作
1、數據基本操作
tablename()
$sql = "SELECT * FROM ".tablename('users');
echo $sql;
//輸出 SELECT * FROM ims_users
2、范圍條件操作
array('>', '<', '<>', '!=', '>=', '<=', 'NOT IN', 'not in', '+=', '-=');
//獲取adid大於269的公眾號
$accout = pdo_get('account', array('acid >' => '269'));
//增加一次用戶的錯誤登錄次數，兩次變為2即可
pdo_update('users_failed_login', array('count +=' => 1),array('username' => 'qiuweinan'));
3、查詢
pdo_get：根據條件（AND連接）到指定的表中獲取一條記錄
array | boolean pdo_get($tablename, $condition = array(), $fields = array());
//根據uid獲取用戶的用戶名和用戶Id信息
//生成的SQL等同於：SELECT username,uid FROM ims_users WHERE uid = '1' LIMIT 1
$user = pdo_get('users', array('uid' => 1), array('username', 'uid'));
//生成的SQL等同於：SELECT username FROM ims_users WHERE username = 'qiuweinan' AND status = '1' LIMIT 1
$user = pdo_get('users', array('username' => 'qiuweinan', 'status' => 1), array('username'));
pdo_getcolumn：根據條件（AND連接）到指定的表中獲取一條記錄的指定字段
string | int pdo_getcolumn($tablename, $condition = array(), $field);
//根據uid獲取用戶的用戶名
//生成的SQL等同於：SELECT username FROM ims_users WHERE uid = '1' LIMIT1
$username = pdo_getcolumn('users', array('uid' => 1), 'username');
pdo_getall：根據條件（AND連接）到指定的表中獲取全部記錄
array | boolean pdo_getall($tablename, $condition = array(), $fields = array(), $keyfiled = '');
//獲取全部啟用的用戶
//生成的SQL等同於：SELECT * FROM ims_users WHERE status = '1'
$user = pdo_getall('users', array('status' => 1));
pdo_getslice：根據條件（AND連接）到指定的表中獲取某個區間的記錄，此函數和pdo_getall的區別是可以指定limit的值
array | boolean pdo_getslice($tablename, $condition = array(), $limit = array(), &$total = null, $fileds = array(), $keyfield = '');
$user = pdo_getslice('users', array(), array(0,10), $total);
echo $total;
pdo_fetch：根據SQL語句，查詢一條記錄
array | boolean pdo_fetch($sql, $params = array());
// :uid 是參數的一個點位符，沒有使用引號，傳入的第二個參數中要與SQL中的占位名稱相同
$user = pdo_fetch("SELECT username, uid FROM ".tablename('users')." WHERE uid = :uid LIMIT 1", array(':uid' => 1));
// LIKE 占位的使用方法
$user = pdo_fetch("SELECT * FROM ".tablename('users')." WHERE username LIKE :username", array(':username' => '%qiuweinan%'));
pdo_fetchcolumn：根據SQL語句，查詢第一條記錄的第N列的值，此語句與pdo_fetch使用相同，只是此函數返回的不是一個數組而是一個字符串
string | boolean pdo_fetchcolumn($sql, $params = array(), $column = 0);
//獲取用戶的總數，返回的值是一個數字
$user_total = pdo_fetchcolumn("SELECT COUNT(*) FROM ".tablename('users'));
pdo_feachall：根據SQL語句，查詢全部記錄，使用方法與pdo_feach相同
array | boolean pdo_fetchall($sql, $params = array(), $keyfield = '');
//需要注意的是，返回的數組的鍵值為用戶的uid
$user = pdo_fetchall("SELECT username,uid FROM ".tablename('users'), array(), 'uid');
4、變更
pdo_insert：對指定數據表插入一條新記錄
int | boolean pdo_insert($tablename, $data = array(), $replace = false);
//添加一條用戶記錄，並判斷是否成功
$user_data = array(
'username' => 'qiuweinan1',
'status' => '1',
);
$result = pdo_insert('users', $user_data);
if(!empty($result)){
$uid = pdo_insertid();
message('添加用戶成功，UID為' .$uid);
}
pdo_update：更新指定的數據表記錄
array | boolean pdo_updata($tablename, $data = array(), $condition, $glue = 'AND');
//更新uid=2的用戶的用戶名
$user_data = array(
'username' => 'qiuweinan2',
);
$result = pdo_update('users', $user_data, array('id' =>2));
if(!empty($result)){
message('更新成功');
}
pdo_delete：刪除指定條件的數據
int | boolean pdo_delete($tablename, $condition = array(), $glue = 'AND');
//刪除用戶名為qiuweinan2的記錄
$result = pdo_delete('users', array('username' => 'qiuweinan2'));
if(!empty($result)){
message('刪除成功');
}
5、運行SQL
pdo_query：運行一條SQL語句
int | boolean pdo_query($sql, $params = array());
//更新uid=2的用戶的用戶名
$result = pdo_query("UPDATA ".tablename('users')." SET username = :username, age = :age WHERE uid = :uid", array(':username' => 'qiuweinan2', ':age' => 18, ':uid' => 2));
//刪除用戶名為qiuweinan2的記錄
$result = pdo_query("DELETE FROM ".tablename('users')." WHERE username = :username", array(':username' => 'qiuweinan2'));
if(!empty($result)){
message('刪除成功');
}
pdo_run：批量執行語句
boolean run($sql, $stuff = 'ims_');
$sql = <<<EOF
CREATE TABLE IF NOT EXISTS `ims_multisearch` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`weid` int(10) unsigned NOT NULL,
PRIMARY KEY (`id`)
)ENGINE=MyISAM DEFAULT CHARSET=utf8;
CREATE TABLE IF NOT EXISTS `ims_multisearch_fields` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`reid` int(10) unsigned NOT NULL,
`type` tinyint(1) unsigned NOT NULL DEFAULT `1`,
PRIMARY KEY(`id`),
KEY 'idx_reid' (`reid`)
)ENGINE=MyISAM DEFAULT CHARSET=utf8;
EOF;
pdo_run($sql);
6、輔助函數
pdo_fieldexists：檢查表中是否存在某個字段
boolean pdo_fieldexists($tablename, $fieldname);
//如果shopping_goods表中不存在credit字段，則新增credit字段
if(!pdo_fieldexists('shopping_goods', 'credit')) {
pdo_query("ALTER TABLE ".tablename('shopping_goods')." ADD `credit` int(11) NOT NULL DEFAULT '0';");
}
pdo_indexexists：檢查表中是否存在某個索引
boolean pdo_indexexists($tablename, $indexname);
//如果site_slide表中不存在multiid索引，則新增multiid索引
if(!pdo_indexexists('site_slide', 'multiid')) {
pdo_query("ALTER TABLE ".tablename('site_slide')." ADD INDEX `multiid` (`multid`);")
}
pdo_tableexists：檢查數據庫中是否存在某個表
boolean pdo_tableexists($tablename);
pdo_debug：調試運行SQL語句，顯示執行過的SQL的棧情況
array pdo_debug($output = true, $append = array());
pdo_debug();
//調用該函數結果如下
Array
(
[0] => Array
(
[sql] => SET NAMES 'utf8';
[error] => Array
(
[0] => 00000
[1] =>
[2] =>
)
)
[1] => Array
(
[sql] => SELECT `value` FROM `ims_core_cache` WHERE `key`=:key
[params] => Array
(
[:key] => setting
)
[error] => Array
(
[0] => 00000
[1] =>
[2] =>
)
)
)