数据库操作
1、数据基本操作
tablename()
$sql = "SELECT * FROM ".tablename('users');
echo $sql;
//输出 SELECT * FROM ims_users
2、范围条件操作
array('>', '<', '<>', '!=', '>=', '<=', 'NOT IN', 'not in', '+=', '-=');
//获取adid大于269的公众号
$accout = pdo_get('account', array('acid >' => '269'));
//增加一次用户的错误登录次数，两次变为2即可
pdo_update('users_failed_login', array('count +=' => 1),array('username' => 'qiuweinan'));
3、查询
pdo_get：根据条件（AND连接）到指定的表中获取一条记录
array | boolean pdo_get($tablename, $condition = array(), $fields = array());
//根据uid获取用户的用户名和用户Id信息
//生成的SQL等同于：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等同于：SELECT username FROM ims_users WHERE username = 'qiuweinan' AND status = '1' LIMIT 1
$user = pdo_get('users', array('username' => 'qiuweinan', 'status' => 1), array('username'));
pdo_getcolumn：根据条件（AND连接）到指定的表中获取一条记录的指定字段
string | int pdo_getcolumn($tablename, $condition = array(), $field);
//根据uid获取用户的用户名
//生成的SQL等同于：SELECT username FROM ims_users WHERE uid = '1' LIMIT1
$username = pdo_getcolumn('users', array('uid' => 1), 'username');
pdo_getall：根据条件（AND连接）到指定的表中获取全部记录
array | boolean pdo_getall($tablename, $condition = array(), $fields = array(), $keyfiled = '');
//获取全部启用的用户
//生成的SQL等同于：SELECT * FROM ims_users WHERE status = '1'
$user = pdo_getall('users', array('status' => 1));
pdo_getslice：根据条件（AND连接）到指定的表中获取某个区间的记录，此函数和pdo_getall的区别是可以指定limit的值
array | boolean pdo_getslice($tablename, $condition = array(), $limit = array(), &$total = null, $fileds = array(), $keyfield = '');
$user = pdo_getslice('users', array(), array(0,10), $total);
echo $total;
pdo_fetch：根据SQL语句，查询一条记录
array | boolean pdo_fetch($sql, $params = array());
// :uid 是参数的一个点位符，没有使用引号，传入的第二个参数中要与SQL中的占位名称相同
$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
$user = pdo_fetch("SELECT * FROM ".tablename('users')." WHERE username LIKE :username", array(':username' => '%qiuweinan%'));
pdo_fetchcolumn：根据SQL语句，查询第一条记录的第N列的值，此语句与pdo_fetch使用相同，只是此函数返回的不是一个数组而是一个字符串
string | boolean pdo_fetchcolumn($sql, $params = array(), $column = 0);
//获取用户的总数，返回的值是一个数字
$user_total = pdo_fetchcolumn("SELECT COUNT(*) FROM ".tablename('users'));
pdo_feachall：根据SQL语句，查询全部记录，使用方法与pdo_feach相同
array | boolean pdo_fetchall($sql, $params = array(), $keyfield = '');
//需要注意的是，返回的数组的键值为用户的uid
$user = pdo_fetchall("SELECT username,uid FROM ".tablename('users'), array(), 'uid');
4、变更
pdo_insert：对指定数据表插入一条新记录
int | boolean pdo_insert($tablename, $data = array(), $replace = false);
//添加一条用户记录，并判断是否成功
$user_data = array(
'username' => 'qiuweinan1',
'status' => '1',
);
$result = pdo_insert('users', $user_data);
if(!empty($result)){
$uid = pdo_insertid();
message('添加用户成功，UID为' .$uid);
}
pdo_update：更新指定的数据表记录
array | boolean pdo_updata($tablename, $data = array(), $condition, $glue = 'AND');
//更新uid=2的用户的用户名
$user_data = array(
'username' => 'qiuweinan2',
);
$result = pdo_update('users', $user_data, array('id' =>2));
if(!empty($result)){
message('更新成功');
}
pdo_delete：删除指定条件的数据
int | boolean pdo_delete($tablename, $condition = array(), $glue = 'AND');
//删除用户名为qiuweinan2的记录
$result = pdo_delete('users', array('username' => 'qiuweinan2'));
if(!empty($result)){
message('删除成功');
}
5、运行SQL
pdo_query：运行一条SQL语句
int | boolean pdo_query($sql, $params = array());
//更新uid=2的用户的用户名
$result = pdo_query("UPDATA ".tablename('users')." SET username = :username, age = :age WHERE uid = :uid", array(':username' => 'qiuweinan2', ':age' => 18, ':uid' => 2));
//删除用户名为qiuweinan2的记录
$result = pdo_query("DELETE FROM ".tablename('users')." WHERE username = :username", array(':username' => 'qiuweinan2'));
if(!empty($result)){
message('删除成功');
}
pdo_run：批量执行语句
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、辅助函数
pdo_fieldexists：检查表中是否存在某个字段
boolean pdo_fieldexists($tablename, $fieldname);
//如果shopping_goods表中不存在credit字段，则新增credit字段
if(!pdo_fieldexists('shopping_goods', 'credit')) {
pdo_query("ALTER TABLE ".tablename('shopping_goods')." ADD `credit` int(11) NOT NULL DEFAULT '0';");
}
pdo_indexexists：检查表中是否存在某个索引
boolean pdo_indexexists($tablename, $indexname);
//如果site_slide表中不存在multiid索引，则新增multiid索引
if(!pdo_indexexists('site_slide', 'multiid')) {
pdo_query("ALTER TABLE ".tablename('site_slide')." ADD INDEX `multiid` (`multid`);")
}
pdo_tableexists：检查数据库中是否存在某个表
boolean pdo_tableexists($tablename);
pdo_debug：调试运行SQL语句，显示执行过的SQL的栈情况
array pdo_debug($output = true, $append = array());
pdo_debug();
//调用该函数结果如下
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] =>
)
)
)