用PHP写接口对接数据库 php接口调用数据库
PHP网站怎么连接到数据库？
常规方式
为陈巴尔虎等地区用户提供了全套网页设计制作服务，及陈巴尔虎网站建设行业解决方案。主营业务为网站制作、成都网站建设、陈巴尔虎网站设计，以传统方式定制建设网站，并提供域名空间备案等一条龙服务，秉承以专业、用心的态度为用户提供真诚的服务。我们深信只要达到每一位用户的要求，就会得到认可，从而选择与我们长期合作。这样，我们也可以走得更远！
常规方式就是按部就班的读取文件了。其余的话和上述方案一致。
// 读取配置文件内容
$handle = fopen("filepath", "r"); $content = fread($handle, filesize("filepath"));123
PHP解析XML
上述两种读取文件，其实都是为了PHP解析XML来做准备的。关于PHP解析XML的方式的博客有很多。方式也有很多，像simplexml，XMLReader，DOM啦等等。但是对于比较小型的xml配置文件，simplexml就足够了。
配置文件
?xml version="1.0" encoding="UTF-8" ?mysql
!-- 为防止出现意外，请按照此标准顺序书写.其实也无所谓了 --
hostlocalhost/host
userroot/user
password123456/password
dbtest/db
port3306/port/mysql12345678910
解析
?php/**
* 作为解析XML配置文件必备工具
*/class XMLUtil {
public static $dbconfigpath = "./db.config.xml"; public static function getDBConfiguration() {
$dbconfig = array (); try { // 读取配置文件内容
$handle = fopen(self::$dbconfigpath, "r"); $content = fread($handle, filesize(self::$dbconfigpath)); // 获取xml文档根节点，进而获取相关的数据库信息
$mysql = simplexml_load_string($content); // 将获取到的xml节点信息赋值给关联数组，方便接下来的方法调用
$dbconfig['host'] = $mysql-host; $dbconfig['user'] = $mysql-user; $dbconfig['password'] = $mysql-password; $dbconfig['db'] = $mysql-db; $dbconfig['port'] = $mysql-port; // 将配置信息以关联数组的形式返回
return $dbconfig;
} catch ( Exception $e ) { throw new RuntimeException ( "mark读取数据库配置文件信息出错！/markbr /" );
} return $dbconfig;
}
}1234567891011121314151617181920212223242526272829
数据库连接池
对于PHP程序而言，优化永无止境。而数据库连接池就在一定程度上起到了优化的作用。其使得对用户的每一个请求而言，无需每次都像数据库申请链接资源。而是通过已存在的数据库连接池中的链接来返回，从时间上，效率上，都是一个大大的提升。
于是，这里简单的模拟了一下数据库连接池的实现。核心在于维护一个“池”。
从池子中取，用毕，归还给池子。
?php/**x
* PHP中的数据库 工具类设计
* 郭璞
* 2016年12月23日
*
**/class DbHelper { private $dbconfig; private $dbpool; public $poolsize; public function __construct($poolsize = 20) { if (! file_exists ( "./utils.php" )) { throw new RuntimeException ( "markutils.php文件丢失，无法进行配置文件的初始化操作！/markbr /" );
}else {
require './utils.php';
} // 初始化 配置文件信息
$this-dbconfig = XMLUtil::getDBConfiguration (); // 准备好数据库连接池“伪队列”
$this-poolsize = $poolsize;
$this-dbpool = array (); for($index = 1; $index = $this-poolsize; $index ++) {
$conn = mysqli_connect ( $this-dbconfig ['host'], $this-dbconfig ['user'], $this-dbconfig ['password'], $this-dbconfig ['db'] ) or die ( "mark连接数据库失败！/markbr /" );
array_push ( $this-dbpool, $conn );
}
} /**
* 从数据库连接池中获取一个数据库链接资源
*
* @throws ErrorException
* @return mixed
*/
public function getConn() { if (count ( $this-dbpool ) = 0) { throw new ErrorException ( "mark数据库连接池中已无链接资源，请稍后重试!/mark" );
} else { return array_pop ( $this-dbpool );
}
} /**
* 将用完的数据库链接资源放回到数据库连接池
*
* @param unknown $conn
* @throws ErrorException
*/
public function release($conn) { if (count ( $this-dbpool ) = $this-poolsize) { throw new ErrorException ( "mark数据库连接池已满/markbr /" );
} else {
array_push ( $this-dbpool, $conn );
}
}
}
PHp如何连接数据库？
PHP链接数据库有几种方式
mysqli：
?php
$servername = "localhost";
$username = "username";
$password = "password";
// 创建连接
$conn = new mysqli($servername, $username, $password);
// 检测连接
if ($conn-connect_error) {
die("连接失败: " . $conn-connect_error);
}
echo "连接成功";
?
也可以使用PDO进行链接，前提是你必须在php.ini中开启PDO：
?php
$servername = "localhost";
$username = "username";
$password = "password";
try {
$conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
echo "连接成功";
}
catch(PDOException $e)
{
echo $e-getMessage();
}
?
建议使用PDO，功能更加强大，兼容各种数据库
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点抗 ';
$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点抗 ',
'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点抗 ';
$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点抗 ',
'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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