PDO的mysql数据库操作类
dbconfig类负责配置数据库访问信息,包括:服务器地址、端口、数据库实例名、用户名、用户密码、字符集等.
dbtemplate类集合了对数据库的访问操作,主要有以下几个操作:
1. queryrows:返回多行记录
2. queryrow:返回为单条记录
3. queryforint:查询单字段,返回整数
4. queryforfloat:查询单字段,返回浮点数(float)
5. queryfordouble:查询单字段,返回浮点数(double)
6. queryforobject:查询单字段,返回对象,实际类型有数据库决定
7. update : 执行一条更新语句. insert / upadate / delete
- class dbconfig {
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- 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 $dsn;
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- public static function getdsn() {
- if (!isset(self::$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;
- }
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- public static function sethost($host) {
- if (isset($host) && strlen($host) > 0)
- self::$host = trim($host);
- }
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- public static function setport($port) {
- if (isset($port) && strlen($port) > 0)
- self::$port = trim($port);
- }
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- public static function setusername($username) {
- if (isset($username) && strlen($username) > 0)
- self::$username = $username;
- }
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- public static function setpassword($password) {
- if (isset($password) && strlen($password) > 0)
- self::$password = $password;
- }
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- public static function setdbname($dbname) {
- if (isset($dbname) && strlen($dbname) > 0)
- self::$dbname = $dbname;
- }
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- public static function setcharset($charset) {
- if (isset($charset) && strlen($charset) > 0)
- self::$charset = $charset;
- }
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- }
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- class dbtemplate {
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- public function queryrows($sql, $parameters = null) {
- return $this->exequery($sql, $parameters);
- }
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- public function queryrow($sql, $parameters = null) {
- $rs = $this->exequery($sql, $parameters);
- if (count($rs) > 0) {
- return $rs[0];
- } else {
- return null;
- }
- }
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- public function queryforint($sql, $parameters = null) {
- $rs = $this->exequery($sql, $parameters);
- if (count($rs) > 0) {
- return intval($rs[0][0]);
- } else {
- return null;
- }
- }
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- public function queryforfloat($sql, $parameters = null) {
- $rs = $this->exequery($sql, $parameters);
- if (count($rs) > 0) {
- return floatval($rs[0][0]);
- } else {
- return null;
- }
- }
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- public function queryfordouble($sql, $parameters = null) {
- $rs = $this->exequery($sql, $parameters);
- if (count($rs) > 0) {
- return doubleval($rs[0][0]);
- } else {
- return null;
- }
- }
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- public function queryforobject($sql, $parameters = null) {
- $rs = $this->exequery($sql, $parameters);
- if (count($rs) > 0) {
- return $rs[0][0];
- } else {
- return null;
- }
- }
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- public function update($sql, $parameters = null) {
- return $this->exeupdate($sql, $parameters);
- }
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- private function getconnection() {
- $conn = new pdo(dbconfig::getdsn(), dbconfig::getusername(), dbconfig::getpassword());
- $conn->setattribute(pdo::attr_case, pdo::case_upper);
- return $conn;
- }
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- private function exequery($sql, $parameters = null) {
- $conn = $this->getconnection();
- $stmt = $conn->prepare($sql);
- $stmt->execute($parameters);
- $rs = $stmt->fetchall();
- $stmt = null;
- $conn = null;
- return $rs;
- }
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- private function exeupdate($sql, $parameters = null) {
- $conn = $this->getconnection();
- $stmt = $conn->prepare($sql);
- $stmt->execute($parameters);
- $affectedrows = $stmt->rowcount();
- $stmt = null;
- $conn = null;
- return $affectedrows;
- }
- }
pdo始于php5,php6中将默认使用pdo,不同于以前版本中混乱的数据库操作方式,pdo统一了对数据库的访问方式,给编程带来了极大的便利性,本工具类就是基于pdo,模拟了java世界spring框架中的jdbctemplate操作类.