本文实例讲述了PHP实现PDO的mysql数据库操作类。分享给大家供大家参考。具体分析如下:
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
具体代码如下:
代码如下:
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 zhjiun@gmail.com
*/
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;
}
}
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.
希望本文所述对大家的PHP程序设计有所帮助。

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