php 数据库 mvc模式,PHP mvc模式 连接数据库及封装PDO数据库操作类 【原创】
1、编写配置文件 config.php
文件里包含主机名，数据库用户名，密码，表名，编码，连接端口
define("hostname", "localhost");
define("username", "root");
define("password", "root");
define("database", "news");
define("charset", "utf8");
define("port", "3306");
2、封装数据库操作类 mPDO.php
class mPDO {
public $SqlBug = ''; // 记录mysql调试语句，可以查看完整的执行的mysql语句
private $pdo = null; // pdo连接
private $statement = null;
public function __construct($hostname, $username, $password, $database, $charset, $port = "3306") {
try {
$this->pdo = new \PDO("mysql:host=" . $hostname . ";port=" . $port . ";dbname=" . $database, $username, $pa ssword, array(\PDO::ATTR_PERSISTENT => true));
} catch(\PDOException $e) {
trigger_error('Error: Could not make a database link ( ' . $e->getMessage() . '). Error Code : ' . $e->ge tCode() . '
');
}
$this->pdo->exec("SET NAMES '" . $charset . "'");
$this->pdo->exec("SET CHARACTER SET " . $charset);
$this->pdo->exec("SET CHARACTER_SET_CONNECTION=" . $charset);
$this->pdo->exec("SET SQL_MODE = ''");
}
public function prepare($sql) {
$this->statement = $this->pdo->prepare($sql);
$this -> SqlBug .= "\n". '' . "\n";
}
public function bindParam($parameter, $variable, $data_type = PDO::PARAM_STR, $length = 0) {
if ($length) {
$this->statement->bindParam($parameter, $variable, $data_type, $length);
} else {
$this->statement->bindParam($parameter, $variable, $data_type);
}
}
public function execute() {
try {
if ($this->statement && $this->statement->execute()) {
$data = array();
while ($row = $this->statement->fetch(PDO::FETCH_ASSOC)) {
$data[] = $row;
}
$result = new stdClass();
$result->row = (isset($data[0])) ? $data[0] : array();
$result->rows = $data;
$result->num_rows = $this->statement->rowCount();
}
} catch(PDOException $e) {
trigger_error('Error: ' . $e->getMessage() . ' Error Code : ' . $e->getCode());
}
}
public function query($sql, $params = array()) {
$this->statement = $this->pdo->prepare($sql);
$result = false;
$this -> SqlBug .= "\n". '' . "\n";
try {
if ($this->statement && $this->statement->execute($params)) {
$data = array();
while ($row = $this->statement->fetch(\PDO::FETCH_ASSOC)) {
$data[] = $row;
}
$result = new \stdClass();
$result->row = (isset($data[0]) ? $data[0] : array());
$result->rows = $data;
$result->num_rows = $this->statement->rowCount();
}
} catch (PDOException $e) {
trigger_error('Error: ' . $e->getMessage() . ' Error Code : ' . $e->getCode() . '
' . $sql);
exit();
}
if ($result) {
return $result;
} else {
$result = new stdClass();
$result->row = array();
$result->rows = array();
$result->num_rows = 0;
return $result;
}
}
public function executeUpdate($sql) {
return $this->pdo->exec($sql);
}
/**
* 获得所有查询条件的值
*/
public function fetchAll($sql, $params = array()) {
$rows = $this->query($sql, $params)->rows;
return !empty($rows) ? $rows : false;
}
/**
* 获得单行记录的值
*/
public function fetchAssoc($sql, $params = array()) {
$row = $this->query($sql, $params)->row;
return !empty($row) ? $row : false;
}
/**
* 获得单个字段的值
*/
public function fetchColumn($sql, $params = array()) {
$data = $this->query($sql, $params)->row;
if(is_array($data)) {
foreach ($data as $value) {
return $value;
}
}
return false;
}
/**
* 返回statement记录集的行数
*/
public function rowCount($sql, $params = array()) {
return $this->query($sql, $params)->num_rows;
}
/**
* 插入数据
* @param string $table 表名
* @param Array $data 数据
* @return int InsertId 新增ID
*/
public function _insert($table, $data) {
if (!is_array($data) || count($data) == 0) {
return 0;
}
$field_arr = array();
foreach ($data as $key=>$val) {
$field_arr[] = " `$key` = '$val' ";
}
$sql = "INSERT INTO " . $table . " SET " . implode(',', $field_arr);
$this -> query($sql);
return $this->getLastId();
}
/**
* 更新数据
* @param string $table 表名
* @param Array $data 数据
* @param string $where 更新条件
* @return int 影响数
*/
public function _update($table, $data, $where = '') {
if(empty($where)) {
return 0;
}
if (!is_array($data) || count($data) == 0) {
return 0;
}
$field_arr = array();
foreach ($data as $key=>$val) {
$field_arr[] = " `$key` = '$val' ";
}
$sql = "UPDATE " . $table . " SET " . implode(',', $field_arr) . " WHERE " . $where;
return $this->pdo->exec($sql);
}
/**
* 获得影响集合中
*/
public function _delete($table, $where = "") {
if(empty($where)) {
return 0;
}
$sql = "DELETE FROM " . $table . " WHERE " . $where;
return $this->pdo->exec($sql);
}
/**
* 获得影响集合中
*/
public function countAffected() {
if ($this->statement) {
return $this->statement->rowCount();
} else {
return 0;
}
}
/*
* 获得插入id
*/
public function getLastId() {
return $this->pdo->lastInsertId();
}
public function escape($value) {
$search = array("\\", "\0", "\n", "\r", "\x1a", "'", '"');
$replace = array("\\\\", "\\0", "\\n", "\\r", "\Z", "\'", '\"');
return str_replace($search, $replace, $value);
}
/**
* 返回错误信息也包括错误号
*/
public function errorInfo() {
return $this->statement->errorInfo();
}
/**
* 返回错误号
*/
public function errorCode() {
return $this->statement->errorCode();
}
public function __destruct() {
$this->pdo = null;
}
}
3、实例化数据库操作类 mysql.php
require_once('/PDO.php'); //分别加载两个文件
require_once('/config.php');
class mysql {
public $mPDO;
public function sql() {
$hostname = constant("hostname");
$username = constant("username");
$password = constant("password");
$database = constant("database");
$charset = constant("charset");
$this->mPDO = new mPDO($hostname, $username, $password, $database, $charset); //实例化数据库操作类
}
}
当要连接操作数据库时，只需require_once(‘/mysql.php’),继承mysql类就可以操作数据库了!
转载时请注明出处及相应链接，本文永久地址：https://blog.yayuanzi.com/10069.html
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