简单的pgsql pdo php操作类实现代码

核心代码：
/**pgsql类*/class pgdb { public $pdo; public static $PDOInstance; public $config; public $data; public $filed = "*"; public $table; public $limit; public $order; public $where; public $left; const LOGIN = 7; const USER = 1; const GROUP = 2; const USERGROUP = 3; const LOG = 6; const WARING = 1; const ERROR = 2; const INFO = 0; public function __construct（） {if （！self::$PDOInstance） {$this->config = json_decode（file_get_contents（"./config/db.json"）, true）;$config = $this->config;$host = $config["data_base"]["db_host"];$dbname = $config["data_base"]["db_name"];$port = $config["data_base"]["db_port"];$username = $config["data_base"]["db_user"];$password = $config["data_base"]["db_pwd"];if （$config["data_base"]["db_host"] ！= "localhost"） {$hosturl = "host=$host;";}try{self::$PDOInstance = new PDO（"pgsql:". $hosturl. "port=$port;". "dbname=$dbname;", $username, $password, array（PDO::ATTR_PERSISTENT => true,））;} catch （Exception $ex） {header（"Content-type: text/html; charset=utf-8"）;$error = "数据库初始化失败，已强制断开链接。<br />抓取到的异常栈如下：<br /><pre>" . print_r（$ex, true） . "</pre>";die（$error）;}try {self::$PDOInstance->query（"SET client_encoding="UTF-8";"）;self::$PDOInstance->setAttribute（PDO::ATTR_EMULATE_PREPARES, false）;self::$PDOInstance->setAttribute（PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION）; } catch （Exception $exc） { $this->pdo=NULL; $doc = <<<DOC <！DOCTYPE html> <html><head><meta charset="UTF-8"><script src="layer/jquery-1.11.1.min.js"></script><script src="layer/layer.js"></script><head> <body>DOC;print $doc;$info=L（"服务器变更请刷新"）;print（"<script>layer.msg（"".$info."", {icon: 2,time: 30000},function（）{location.reload（）;}）;</script>"）;print（"</body></html>"）;exit（）;} } $this->pdo = self::$PDOInstance;}}