class dbconfig { private static $dbms = "mysql"; private static $host = '127.0.0.1'; private static $port = '3306'; private static $username = ''; private static $password = ''; private static $dbname = ''; private static $charset = 'utf-8'; private static $dsn; /** * * @return 返回pdo dsn配置 */ public static function getdsn() { if (!isset(self::$dsn)) { self::$dsn = self::$dbms . ':host=' . self::$host . ';port=' . self::$port . ';dbname=' . self::$dbname; if (strlen(self::$charset) > 0) { self::$dsn = self::$dsn . ';charset=' . self::$charset; } } return self::$dsn; } /** * 设置mysql数据库服务器主机 * @param $host 主机的ip地址 */ public static function sethost($host) { if (isset($host) && strlen($host) > 0) self::$host = trim($host); } /** * 设置mysql数据库服务器的端口 * @param $port 端口 */ public static function setport($port) { if (isset($port) && strlen($port) > 0) self::$port = trim($port); } /** * 设置mysql数据库服务器的登陆用户名 * @param $username */ public static function setusername($username) { if (isset($username) && strlen($username) > 0) self::$username = $username; } /** * 设置mysql数据库服务器的登陆密码 * @param $password */ public static function setpassword($password) { if (isset($password) && strlen($password) > 0) self::$password = $password; } /** * 设置mysql数据库服务器的数据库实例名 * @param $dbname 数据库实例名 */ public static function setdbname($dbname) { if (isset($dbname) && strlen($dbname) > 0) self::$dbname = $dbname; } /** * 设置数据库编码 * @param $charset */ public static function setcharset($charset) { if (isset($charset) && strlen($charset) > 0) self::$charset = $charset; } } /** * 一个数据库操作工具类 * * @author [email protected] */ class dbtemplate { /** * 返回多行记录 * @param $sql * @param $parameters * @return 记录数据 */ public function queryrows($sql, $parameters = null) { return $this->exequery($sql, $parameters); } /** * 返回为单条记录 * @param $sql * @param $parameters * @return */ public function queryrow($sql, $parameters = null) { $rs = $this->exequery($sql, $parameters); if (count($rs) > 0) { return $rs[0]; } else { return null; } } /** * 查询单字段,返回整数 * @param $sql * @param $parameters * @return */ public function queryforint($sql, $parameters = null) { $rs = $this->exequery($sql, $parameters); if (count($rs) > 0) { return intval($rs[0][0]); } else { return null; } } /** * 查询单字段,返回浮点数(float) * @param $sql * @param $parameters * @return */ public function queryforfloat($sql, $parameters = null) { $rs = $this->exequery($sql, $parameters); if (count($rs) > 0) { return floatval($rs[0][0]); } else { return null; } } /** * 查询单字段,返回浮点数(double) * @param $sql * @param $parameters * @return */ public function queryfordouble($sql, $parameters = null) { $rs = $this->exequery($sql, $parameters); if (count($rs) > 0) { return doubleval($rs[0][0]); } else { return null; } } /** * 查询单字段,返回对象,实际类型有数据库决定 * @param $sql * @param $parameters * @return */ public function queryforobject($sql, $parameters = null) { $rs = $this->exequery($sql, $parameters); if (count($rs) > 0) { return $rs[0][0]; } else { return null; } } /** * 执行一条更新语句.insert / upadate / delete * @param $sql * @param $parameters * @return 影响行数 */ public function update($sql, $parameters = null) { return $this->exeupdate($sql, $parameters); } private function getconnection() { $conn = new pdo(dbconfig::getdsn(), dbconfig::getusername(), dbconfig::getpassword()); $conn->setattribute(pdo::attr_case, pdo::case_upper); return $conn; } private function exequery($sql, $parameters = null) { $conn = $this->getconnection(); $stmt = $conn->prepare($sql); $stmt->execute($parameters); $rs = $stmt->fetchall(); $stmt = null; $conn = null; return $rs; } private function exeupdate($sql, $parameters = null) { $conn = $this->getconnection(); $stmt = $conn->prepare($sql); $stmt->execute($parameters); $affectedrows = $stmt->rowcount(); $stmt = null; $conn = null; return $affectedrows; } }
希望本文所述对大家的PHP程序设计有所帮助。