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

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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

php查询数据库

mysqli有两种数据库连接方式：

1、面向过程式连接：

mysqli_connect('localhost','xxx','xxx','xxx');

mysqli_query('');

后使用mysqli_fetch_assoc方法获取到数据。

2、面向对象式连接：

$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$result = $mysqli-query('');

后使用$result-fetch_assoc()获取数据。

至于num_rows是获取查询到的行数的方法。

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

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