php的数据库接口（php的数据库接口框架）

本文目录一览：

1、pdo是什么意思？
2、php中怎么把数据库连接写成一个接口
3、php 怎么访问接口
4、js如何用php去接收数据库中的数据

pdo是什么意思？

PDO（PHP Data Objects）是一种在PHP里连接数据库的使用接口。PDO与mysqli曾经被建议用来取代原本PHP在用的mysql相关函数，基于数据库使用的安全性，因为后者欠缺对于SQL注入的防护。

PHP 数据对象（PDO）扩展为PHP访问数据库定义了一个轻量级的一致接口。实现 PDO 接口的每个数据库驱动可以公开具体数据库的特性作为标准扩展功能。注意利用 PDO 扩展自身并不能实现任何数据库功能；必须使用一个具体数据库的 PDO 驱动来访问数据库服务。

php中怎么把数据库连接写成一个接口

我自己封装的一个

?php

class AppConfig{

public static $dbParam = array(

'dbHost' = 'localhost',

'dbUser' = 'root',

'dbPassword' ='',

'dbName' = '数据库名',

'dbCharset' = 'utf8',

'dbPort' = 3306,

'dbPrefix' = 'test_',

'dbPconnect' = 0,

'dbDebug' = true,

);

}

class Model {

private $version = ''; //mysql版本

private $config = array(); //数据库配置数组

private $class; //当前类名

public $tablepre = 'ts_'; //表前缀

public $db = ''; //库名

public $table = ''; //表名

private static $link; //数据库链接句柄

private $data = array(); //中间数据容器

private $condition = ''; //查询条件

private $fields = array(); //字段信息

private $sql = array(); //sql集合，调试用

public $primaryKey = 'id'; //表主键

//构造函数初始化

public function __construct($dbParam = array()) {

$this-config = (is_array($dbParam) !empty($dbParam)) ? $dbParam : AppConfig::$dbParam;

$this-connect();

$this-init();

}

//链接数据库

private function connect() {

if($this-config['dbPconnect']) {

self::$link = @mysql_pconnect($this-config['dbHost'], $this-config['dbUser'], $this-config['dbPassword']);

}else{

self::$link = @mysql_connect($this-config['dbHost'], $this-config['dbUser'], $this-config['dbPassword'], true);

}

mysql_errno(self::$link) != 0 $this-errdie('Could not connect Mysql: ');

$this-db= !empty($this-db) ? $this-db : $this-config['dbName'];

$serverinfo = $this-version();

if ($serverinfo '4.1' $this-config['dbCharset']) {

mysql_query("SET character_set_connection=".$this-config['dbCharset'].",character_set_results=".$this-config['dbCharset'].",character_set_client=binary", self::$link);

}

if ($serverinfo '5.0') {

mysql_query("SET sql_mode=''", self::$link);

}

@mysql_select_db($this-db, self::$link) or $this-errdie('Cannot use database');

return self::$link;

}

//表基本信息初始化

protected function init() {

$this-class = get_class($this);

$this-table = !empty($this-table) ? $this-table : strtolower($this-class);

$this-table = $this-tablepre . $this-table;

return $this;

}

//设置属性值

public function __set($name, $value) {

//exit($value);

$this-data['fields'][$name] = $value;

}

//获取属性值

public function __get($name) {

if(isset($this-data['fields'][$name])) {

return($this-data['fields'][$name]);

}else {

return NULL;

}

//字段信息处理

private function implodefields($data) {

if (!is_array($data)) {

$data = array();

}

$this-fields = !empty($this-data['fields']) ? array_merge($this-data['fields'], $data) : $data;

foreach($this-fields as $key = $value) {

$fieldsNameValueStr[] = "`$key`='$value'";

$fieldsNameStr[] = "`$key`";

$fieldsValueStr[] = "'$value'";

}

return array($fieldsNameValueStr, $fieldsNameStr, $fieldsValueStr);

}

//条件判断组装

private function condition($where = NULL) {

if (is_numeric($where)) {

$where = "WHERE `{$this-primaryKey}`='{$where}' LIMIT 1";

}elseif (is_array($where)){

$where = "WHERE `{$this-primaryKey}` in (".implode(',',$where).")";

}elseif(!empty($this-data['condition'])){

//'预留WHERE', 'order', 'group', 'limit' …………等条件关键词处理接口

$where = $where ? "WHERE {$where}" : "WHERE 1";

isset($this-data['condition']['where']) $where .= ' AND '.$this-data['condition']['where'];

isset($this-data['condition']['group']) $where .= ' GROUP BY '.$this-data['condition']['group'];

isset($this-data['condition']['order']) $where .= ' ORDER BY '.$this-data['condition']['order'];

isset($this-data['condition']['limit']) $where .= ' LIMIT '.$this-data['condition']['limit'];

}else{

$where = "WHERE {$where}";

}

$this-condition = $where;

return $this;

}

//插入数据

public function insert($data = array(), $replace = false) {

$fields = $this-implodefields($data);

$insert = $replace ? 'REPLACE' : 'INSERT';

$sql = "{$insert} INTO `{$this-db}`.`{$this-table}` (".implode(', ',$fields[1]).") values (".implode(', ',$fields[2]).")";

$this-query($sql);

return $this-getInsertId();

}

//更新数据

public function update($data = array() ,$where = '') {

$numargs = func_num_args();

if ($numargs == 1) {

$where = $data;

$data = array();

}

$fields = $this-implodefields($data);

$this-condition($where);

$sql = "UPDATE `{$this-db}`.`{$this-table}` SET ".implode(', ',$fields[0])." {$this-condition}";

$this-query($sql);

return $this-getAffectedRows();

}

//删除数据

public function delete($where = NULL) {

if(!is_array($where) strtolower(substr(trim($where), 0, 6)) == 'delete'){

$sql = $where;

}else{

$this-condition($where);

$sql = "DELETE FROM `{$this-db}`.`{$this-table}` {$this-condition}";

}

$this-query($sql);

return $this-getAffectedRows();

}

//查询数据

public function select($where = NULL, $fields = '*') {

if(!is_array($where) strtolower(substr(trim($where), 0, 6)) == 'select'){

$sql = $where;

}else{

$this-condition($where);

$sql = "SELECT {$fields} FROM `{$this-db}`.`{$this-table}` {$this-condition}";

}

return $this-fetch($this-query($sql));

}

//查询一条数据

public function getOne($where, $fields = '*') {

$data = $this-select($where, $fields = '*');

if($data) {

return $data[0];

}

return array();

}

//查询多条数据

public function getAll($where, $fields = '*') {

$data = $this-select($where, $fields = '*');

return $data;

}

//结果数量

public function getCount($where = '', $fields = '*') {

$this-condition($where);

$sql = "SELECT count({$fields}) as count FROM `{$this-db}`.`{$this-table}` {$this-condition}";

$data = $this-query($sql);

if($data){

return @mysql_result($data,0);

}

return 0;

}

//执行sql语句（flag为0返回mysql_query查询后的结果，为1返回lastid，其他返回影响行数，默认为2返回影响行数）

public function query($sql, $flag = '0', $type = '') {

if ($this-config['dbDebug']) {

$startime = $this-microtime_float();

}

//查询

if ($type == 'UNBUFFERED' function_exists('mysql_unbuffered_query')) {

$result = @mysql_unbuffered_query($sql, self::$link);

} else {

//exit($sql);

$result = @mysql_query($sql, self::$link);

}

//重试

if (in_array(mysql_errno(self::$link), array(2006,2013)) empty($result) $this-config['dbPconnect']==0 !defined('RETRY')) {

define('RETRY',true); @mysql_close(self::$link); sleep(2);

$this-connect();

$result = $this-query($sql);

}

if ($result === false) {

$this-errdie($sql);

}

if ($this-config['dbDebug']) {

$endtime = $this-microtime_float();

$this-sql[] = array($sql,$endtime-$startime);

}

//清空操作数据

$this-data = array();

return $flag == '0' ? $result : ($flag == '1' ? $this-getInsertId() : $this-getAffectedRows());

}

//返回结果$onlyone为true返回一条否则返回所有,$type有MYSQL_ASSOC,MYSQL_NUM,MYSQL_BOTH

public function fetch($result, $onlyone = false, $type = MYSQL_ASSOC) {

if($result){

if ($onlyone) {

$row = @mysql_fetch_array($result, $type);

return $row;

}else{

$rowsRs = array();

while($row=@mysql_fetch_array($result, $type)) {

$rowsRs[] = $row;

}

return $rowsRs;

}

return array();

}

//可以运行SELECT，SHOW，EXPLAIN 或 DESCRIBE 等返回一个资源标识符的语句得到返回结果数组

public function show($sql, $onlyone = false) {

return $this-fetch($this-query($sql), $onlyone);

}

// 使用call函数处理同类型函数

private function __call($name, $arguments) {

$callArr = array('on', 'where', 'order', 'between', 'group', 'limit');

if (in_array($name, $callArr)) {

$this-data['condition'][$name] = $arguments[0];

}else{

$this-errdie("function error: function {$name} is not in ($this-class) class exist");

}

return $this;

}

//返回最后一次插入ID

public function getInsertId() {

return @mysql_insert_id(self::$link);

}

//返回受影响行数

public function getAffectedRows() {

return @mysql_affected_rows(self::$link);

}

//获取错误信息

private function error() {

return ((self::$link) ? @mysql_error(self::$link) : @mysql_error());

}

//获取错误信息ID

private function errno() {

return ((self::$link) ? @mysql_errno(self::$link) : @mysql_errno());

}

//获取版本信息

function version() {

if(empty($this-version)) {

$this-version = mysql_get_server_info(self::$link);

}

return $this-version;

}

//打印错误信息

private function errdie($sql = '') {

if ($this-config['dbDebug']) {

die('/BRBMySQL ERROR/B/BR

SQL:'.$sql.'/BR

ERRNO:'.$this-errno().'/BR

ERROR:'.$this-error().'/BR');

}

die('DB ERROR！！！');

}

//获取时间微妙数

private function microtime_float()

{

list($usec, $sec) = explode(" ", microtime());

return ((float)$usec + (float)$sec);

}

//析构函数

public function __destruct() {

echo 'hr';

$this-config['dbDebug'] print_r($this-sql);

//unset($this-result);

//unset($this-condition);

//unset($this-data);

}

class user extends Model {

//public $db = 'qsf_mvc';

//public $table = 'user';

public $primaryKey = 'uid';

}

$userObj = new user();

//---------------------------------------插入数据方法一-----------------------------------------

//模拟ActiveRecord模式插入数据

$userObj-username = 'hoho';

$userObj-passwd = '1478522';

$userObj-email = 'qsf.z11@163.com';

$userObj-sex = 1;

$userObj-desc = '清洁工';

$insetId = $userObj-insert();

if ($insetId 0) {

echo "插入ID为:{$insetId}BR";

}

//---------------------------------------插入数据方法二-----------------------------------------

//直接数组做参数插入数据

$userArr = array(

'username' = 'hoho',

'passwd' = '1478522',

'email' = 'qsf.z2121ia@163.com',

'sex' = '1',

'desc' = '厨师',

);

$insetId = $userObj-insert($userArr);

if ($insetId 0) {

echo "插入ID为:{$insetId}BR";

}

//---------------------------------------更新数据方法一----------------------------------------

$userObj-username = 'h111oho';

$userObj-passwd = '1478511122';

$userObj-email = 'qsf111ia@163.com';

$userObj-sex = 1;

$userObj-desc = '清洁工';

$affectedRows1 = $userObj-update(89);

if ($affectedRows1 0) {

echo "影响行数为:{$affectedRows1}BR";

}

//---------------------------------------更新数据方法二----------------------------------------

//更新记录（传递参数的方式和insert操作一样）

$userArr = array(

'username' = 'hohoho',

'passwd' = '1474rr4448522',

'email' = 'qsf.rrza@165.com',

'sex' = '0',

'desc' = '厨师qq',

);

$affectedRows = $userObj-update($userArr, $insetId);

if ($affectedRows 0) {

echo "影响行数为:{$affectedRows}BR";

}

//----------------------------------------查询数据----------------------------------------------

$userRs0 = $userObj-select(8); //单个主键值

//print_r($userRs0);

$userRs1 = $userObj-select(array(1,5,8)); //多个主键值的数组

//print_r($userRs1);

$userRs2 = $userObj-select('select count(*) as count from user where uid 20'); //直接完整sql语句

//print_r($userRs2);

$userRs3 = $userObj-select("`uid` 0"); //where条件

//print_r($userRs3);

$userRs4 = $userObj-getOne("`uid` 0"); //获取单条记录

//print_r($userRs4);

$usersRs5 = $userObj-getAll("`uid` 0"); ////获取所有记录

//print_r($usersRs5);

$usersRs6 = $userObj-limit('0,10')-where('uid 100')-order('uid DESC')-group('username')-select();

//print_r($usersRs6);

//----------------------------------------删除数据-----------------------------------------------

//删除操作传递参数的方式和select操作一样

$userObj-delete(60); //单个主键值

$userObj-delete(array(1,5,8)); //多个主键值的数组

$userObj-delete('delete from user where uid 100'); //直接完整sql语句

$userObj-delete("`uid` 100"); //where条件

$userObj-limit('5')-where('uid 80')-delete();

//----------------------------------------特殊查询-----------------------------------------------

$userShowRs = $userObj-show('show create table user', true); //获取特殊查询的结果,第二个参数代表返回一条结果还是所有的结果

php 怎么访问接口

统一的数据访问接口PDO

PDO（PHP Data Objects）扩展为 PHP 访问数据库定义了一个轻量级的、一致性的接口，它提供了一个数据访问抽象层，这样，无论使用什么数据库，用户都可以通过统一的函数执行来查询和获取数据。注意，你并不能使用 PDO 扩展本身执行任何数据库操作，必须使用一个 database-specific PDO driver （针对特定数据库的 PDO 驱动）访问数据库服务器。

js如何用php去接收数据库中的数据

要用javascript调用php获取数据库接口，是一个很常见的前后端交互操作

通过javascript发送http请求php的API接口，php连接数据库并查询结果，最后返回出来

这样javascript就能获取到数据库的数据