php數(shù)據(jù)庫連接類封裝 php封裝數(shù)據(jù)庫操作

php中怎么把數(shù)據(jù)庫連接寫成一個接口

我自己封裝的一個

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?php

class AppConfig{

public static $dbParam = array(

'dbHost' = 'localhost',

'dbUser' = 'root',

'dbPassword' ='',

'dbName' = '數(shù)據(jù)庫名',

'dbCharset' = 'utf8',

'dbPort' = 3306,

'dbPrefix' = 'test_',

'dbPconnect' = 0,

'dbDebug' = true,

);

}

class Model {

private $version = ''; //mysql版本

private $config = array(); //數(shù)據(jù)庫配置數(shù)組

private $class; //當前類名

public $tablepre = 'ts_'; //表前綴

public $db = ''; //庫名

public $table = ''; //表名

private static $link; //數(shù)據(jù)庫鏈接句柄

private $data = array(); //中間數(shù)據(jù)容器

private $condition = ''; //查詢條件

private $fields = array(); //字段信息

private $sql = array(); //sql集合，調(diào)試用

public $primaryKey = 'id'; //表主鍵

//構(gòu)造函數(shù)初始化

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

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

$this-connect();

$this-init();

}

//鏈接數(shù)據(jù)庫

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;

}

//設置屬性值

public function __set($name, $value) {

//exit($value);

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

}

//獲取屬性值

public function __get($name) {

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

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

}else {

return NULL;

}

//字段信息處理

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);

}

//條件判斷組裝

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'])){

//'預留WHERE', 'order', 'group', 'limit' …………等條件關鍵詞處理接口

$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;

}

//插入數(shù)據(jù)

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();

}

//更新數(shù)據(jù)

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();

}

//刪除數(shù)據(jù)

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();

}

//查詢數(shù)據(jù)

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));

}

//查詢一條數(shù)據(jù)

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

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

if($data) {

return $data[0];

}

return array();

}

//查詢多條數(shù)據(jù)

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

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

return $data;

}

//結(jié)果數(shù)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;

}

//執(zhí)行sql語句（flag為0返回mysql_query查詢后的結(jié)果，為1返回lastid，其他返回影響行數(shù)，默認為2返回影響行數(shù)）

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

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

$startime = $this-microtime_float();

}

//查詢

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

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

} else {

//exit($sql);

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

}

//重試

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);

}

//清空操作數(shù)據(jù)

$this-data = array();

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

}

//返回結(jié)果$onlyone為true返回一條否則返回所有,$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();

}

//可以運行SELECT，SHOW，EXPLAIN 或 DESCRIBE 等返回一個資源標識符的語句得到返回結(jié)果數(shù)組

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

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

}

// 使用call函數(shù)處理同類型函數(shù)

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);

}

//返回受影響行數(shù)

public function getAffectedRows() {

return @mysql_affected_rows(self::$link);

}

//獲取錯誤信息

private function error() {

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

}

//獲取錯誤信息ID

private function errno() {

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

}

//獲取版本信息

function version() {

if(empty($this-version)) {

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

}

return $this-version;

}

//打印錯誤信息

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?。?！');

}

//獲取時間微妙數(shù)

private function microtime_float()

{

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

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

}

//析構(gòu)函數(shù)

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();

//---------------------------------------插入數(shù)據(jù)方法一-----------------------------------------

//模擬ActiveRecord模式插入數(shù)據(jù)

$userObj-username = 'hoho';

$userObj-passwd = '1478522';

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

$userObj-sex = 1;

$userObj-desc = '清潔工';

$insetId = $userObj-insert();

if ($insetId 0) {

echo "插入ID為:{$insetId}BR";

}

//---------------------------------------插入數(shù)據(jù)方法二-----------------------------------------

//直接數(shù)組做參數(shù)插入數(shù)據(jù)

$userArr = array(

'username' = 'hoho',

'passwd' = '1478522',

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

'sex' = '1',

'desc' = '廚師',

);

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

if ($insetId 0) {

echo "插入ID為:{$insetId}BR";

}

//---------------------------------------更新數(shù)據(jù)方法一----------------------------------------

$userObj-username = 'h111oho';

$userObj-passwd = '1478511122';

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

$userObj-sex = 1;

$userObj-desc = '清潔工';

$affectedRows1 = $userObj-update(89);

if ($affectedRows1 0) {

echo "影響行數(shù)為:{$affectedRows1}BR";

}

//---------------------------------------更新數(shù)據(jù)方法二----------------------------------------

//更新記錄（傳遞參數(shù)的方式和insert操作一樣）

$userArr = array(

'username' = 'hohoho',

'passwd' = '1474rr4448522',

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

'sex' = '0',

'desc' = '廚師qq',

);

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

if ($affectedRows 0) {

echo "影響行數(shù)為:{$affectedRows}BR";

}

//----------------------------------------查詢數(shù)據(jù)----------------------------------------------

$userRs0 = $userObj-select(8); //單個主鍵值

//print_r($userRs0);

$userRs1 = $userObj-select(array(1,5,8)); //多個主鍵值的數(shù)組

//print_r($userRs1);

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

//print_r($userRs2);

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

//print_r($userRs3);

$userRs4 = $userObj-getOne("`uid` 0"); //獲取單條記錄

//print_r($userRs4);

$usersRs5 = $userObj-getAll("`uid` 0"); ////獲取所有記錄

//print_r($usersRs5);

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

//print_r($usersRs6);

//----------------------------------------刪除數(shù)據(jù)-----------------------------------------------

//刪除操作傳遞參數(shù)的方式和select操作一樣

$userObj-delete(60); //單個主鍵值

$userObj-delete(array(1,5,8)); //多個主鍵值的數(shù)組

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

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

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

//----------------------------------------特殊查詢-----------------------------------------------

$userShowRs = $userObj-show('show create table user', true); //獲取特殊查詢的結(jié)果,第二個參數(shù)代表返回一條結(jié)果還是所有的結(jié)果

php封裝一個class類實現(xiàn)mysql數(shù)據(jù)庫的增刪該查

?php

class db{

private $db;

const MYSQL_OPT_READ_TIMEOUT = 11;

const MYSQL_OPT_WRITE_TIMEOUT = 12;

private $tbl_name;

private $where;

private $sort;

private $fields;

private $limit;

public static $_instance = null;

function __construct(){

$cfg = loadConfig('db');

$db = mysqli_init();

$db-options(self::MYSQL_OPT_READ_TIMEOUT, 3);

$db-options(self::MYSQL_OPT_WRITE_TIMEOUT, 1);

@$db-real_connect($cfg['host'],$cfg['user'],$cfg['pwd'],$cfg['db']);

if ($db-connect_error) {

$this-crash($db-errno,$db-error);

}

$db-set_charset("utf8");

$this-db = $db;

//echo $this-db-stat;

}

public static function getInstance(){

if(!(self::$_instance instanceof self)){

self::$_instance = new self();

}

return self::$_instance;

}

private function __clone() {} //覆蓋__clone()方法，禁止克隆

public function find($conditions = null){

if($conditions) $this-where($conditions);

return $this-getArray($this-buildSql(),1);

}

public function findAll($conditions = null){

if($conditions) $this-where($conditions);

return $this-getArray($this-buildSql());

}

//表

public function t($table){ $this-tbl_name = $table; return $this;}

//條件

public function where($conditions){

$where = '';

if(is_array($conditions)){

$join = array();

foreach( $conditions as $key = $condition ){

$condition = $this-db-real_escape_string($condition);

$join[] = "`{$key}` = '{$condition}'";

}

$where = "WHERE ".join(" AND ",$join);

}else{

if(null != $conditions) $where = "WHERE ".$conditions;

}

$this-where = $where;

return $this;

}

//排序

public function sort($sort){

if(null != $sort) $sort = "ORDER BY {$sort}";

$this-sort = $sort;

return $this;

}

//字段

public function fields($fields){ $this-fields = $fields; return $this; }

public function limit($limit){$this-limit = $limit; return $this;}

private function buildSql(){

$this-fields = empty($this-fields) ? "*" : $this-fields;

$sql = "SELECT {$this-fields} FROM {$this-tbl_name} {$this-where} {$this-sort}";

accessLog('db_access',$sql);

if(null != $this-limit)$sql .= " limit {$this-limit}";

return $sql;

}

/**

* 返回查詢數(shù)據(jù)

* @param $sql

* @param bool $hasOne

* @return array|bool|mixed

private function getArray($sql,$hasOne = false){

if($this-db-real_query($sql) ){

if ($result = $this-db-use_result()) {

$row = array();

if($hasOne){

$row = $result-fetch_assoc();

}else{

while($d = $result-fetch_assoc()) $row[] = $d;

}

$result-close();

$this-fields = "*";

return $row;

}else{

return false;

}

}else{

if($this-db-error){

$this-crash($this-db-errno,$this-db-error,$sql);

}

public function findSql($sql,$hasOne = false){

accessLog('db_access',$sql);

if($this-db-real_query($sql) ){

if ($result = $this-db-use_result()) {

$row = array();

if($hasOne){

$row = $result-fetch_assoc();

}else{

while($d = $result-fetch_assoc()) $row[] = $d;

}

$result-close();

$this-fields = "*";

return $row;

}else{

return false;

}

}else{

if($this-db-error){

$this-crash($this-db-errno,$this-db-error,$sql);

}

public function create($row){

if(!is_array($row))return FALSE;

$row = $this-prepera_format($row);

if(empty($row))return FALSE;

foreach($row as $key = $value){

$cols[] = '`'.$key.'`';

$vals[] = "'".$this-db-real_escape_string($value)."'";

}

$col = implode(',', $cols);

$val = implode(',', $vals);

$sql = "INSERT INTO `{$this-tbl_name}` ({$col}) VALUES ({$val})";

accessLog('db_access',$sql);

if( FALSE != $this-db-query($sql) ){ // 獲取當前新增的ID

if($this-db-insert_id){

return $this-db-insert_id;

}

if($this-db-affected_rows){

return true;

}

return FALSE;

}

//直接執(zhí)行sql

public function runSql($sql){

accessLog('db_access',$sql);

if( FALSE != $this-db-query($sql) ){ // 獲取當前新增的ID

return true;

}else{

return false;

}

public function update($row){

$where = "";

$row = $this-prepera_format($row);

if(empty($row))return FALSE;

foreach($row as $key = $value){

$value = $this-db-real_escape_string($value);

$vals[] = "`{$key}` = '{$value}'";

}

$values = join(", ",$vals);

$sql = "UPDATE {$this-tbl_name} SET {$values} {$this-where}";

accessLog('db_access',$sql);

if( FALSE != $this-db-query($sql) ){ // 獲取當前新增的ID

if( $this-db-affected_rows){

return true;

}

return false;

}

function delete(){

$sql = "DELETE FROM {$this-tbl_name} {$this-where}";

if( FALSE != $this-db-query($sql) ){ // 獲取當前新增的ID

if( $this-db-affected_rows){

return true;

}

return FALSE;

}

private function prepera_format($rows){

$columns = $this-getArray("DESCRIBE {$this-tbl_name}");

$newcol = array();

foreach( $columns as $col ){

$newcol[$col['Field']] = $col['Field'];

}

return array_intersect_key($rows,$newcol);

}

//崩潰信息

private function crash($number,$message,$sql=''){

$msg = 'Db Error '.$number.':'.$message ;

if(empty($sql)){

echo t('db_crash');

}else{

$msg .= " SQL:".$sql;

echo t('db_query_err');

}

accessLog('db_error',$msg);

exit;

}

PHP中對數(shù)據(jù)庫操作的封裝，有什么好的例子嗎

類文件mysql.class.php：

?php

class?Mysql{

//數(shù)據(jù)庫連接返回值

private?$conn;

/**

*?[構(gòu)造函數(shù)，返回值給$conn]

*?@param?[string]?$hostname?[主機名]

*?@param?[string]?$username[用戶名]

*?@param?[string]?$password[密碼]

*?@param?[string]?$dbname[數(shù)據(jù)庫名]

*?@param?[string]?$charset[字符集]

*?@return?[null]

function?__construct($hostname,$username,$password,$dbname,$charset='utf8'){

$config?=?@mysql_connect($hostname,$username,$password);

if(!$config){

echo?'連接失敗，請聯(lián)系管理員';

exit;

}

$this-conn?=?$config;

$res?=?mysql_select_db($dbname);

if(!$res){

echo?'連接失敗，請聯(lián)系管理員';

exit;

}

mysql_set_charset($charset);

}

function?__destruct(){

mysql_close();

}

/**

*?[getAll?獲取所有信息]

*?@param?[string]?$sql?[sql語句]

*?@return?[array]?[返回二維數(shù)組]

function?getAll($sql){

$result?=?mysql_query($sql,$this-conn);

$data?=?array();

if($result??mysql_num_rows($result)0){

while($row?=?mysql_fetch_assoc($result)){

$data[]?=?$row;

}

return?$data;

}

/**

*?[getOne?獲取單條數(shù)據(jù)]

*?@param?[string]?$sql?[sql語句]

*?@return?[array]?[返回一維數(shù)組]

function?getOne($sql){

$result?=?mysql_query($sql,$this-conn);

$data?=?array();

if($result??mysql_num_rows($result)0){

$data?=?mysql_fetch_assoc($result);

}

return?$data;

}

/**

*?[getOne?獲取單條數(shù)據(jù)]

*?@param?[string]?$table?[表名]

*?@param?[string]?$data?[由字段名當鍵，屬性當鍵值的一維數(shù)組]

*?@return?[type]?[返回false或者插入數(shù)據(jù)的id]

function?insert($table,$data){

$str?=?'';

$str?.="INSERT?INTO?`$table`?";

$str?.="(`".implode("`,`",array_keys($data))."`)?";

$str?.="?VALUES?";

$str?.=?"('".implode("','",$data)."')";

$res?=?mysql_query($str,$this-conn);

if($res??mysql_affected_rows()0){

return?mysql_insert_id();

}else{

return?false;

}

/**

*?[update?更新數(shù)據(jù)庫]

*?@param?[string]?$table?[表名]

*?@param?[array]?$data?[更新的數(shù)據(jù)，由字段名當鍵，屬性當鍵值的一維數(shù)組]

*?@param?[string]?$where?[條件，‘字段名’=‘字段屬性’]

*?@return?[type]?[更新成功返回影響的行數(shù)，更新失敗返回false]

function?update($table,$data,$where){

$sql?=?'UPDATE?'.$table.'?SET?';

foreach($data?as?$key?=?$value){

$sql?.=?"`{$key}`='{$value}',";

}

$sql?=?rtrim($sql,',');

$sql?.=?"?WHERE?$where";

$res?=?mysql_query($sql,$this-conn);

if($res??mysql_affected_rows()){

return?mysql_affected_rows();

}else{

return?false;

}

/**

*?[delete?刪除數(shù)據(jù)]

*?@param?[string]?$table?[表名]

*?@param?[string]?$where?[條件，‘字段名’=‘字段屬性’]

*?@return?[type]?[成功返回影響的行數(shù)，失敗返回false]

function?del($table,$where){

$sql?=?"DELETE?FROM?`{$table}`?WHERE?{$where}";

$res?=?mysql_query($sql,$this-conn);

if($res??mysql_affected_rows()){

return?mysql_affected_rows();

}else{

return?false;

}

使用案例:

?php

//包含數(shù)據(jù)庫操作類文件

include?'mysql.class.php';

//設置傳入?yún)?shù)

$hostname='localhost';

$username='root';

$password='123456';

$dbname='aisi';

$charset?=?'utf8';

//實例化對象

$db?=?new?Mysql($hostname,$username,$password,$dbname);

//獲取一條數(shù)據(jù)

$sql?=?"SELECT?count(as_article_id)?as?count?FROM?as_article?where?as_article_type_id=1";

$count?=?$db-getOne($sql);

//獲取多條數(shù)據(jù)

$sql?=?"SELECT?*?FROM?as_article?where?as_article_type_id=1?order?by?as_article_addtime?desc?limit?$start,$limit";

$service?=?$db-getAll($sql);

//插入數(shù)據(jù)

$arr?=?array(

'as_article_title'='數(shù)據(jù)庫操作類',

'as_article_author'='rex',

);

$res?=?$db-insert('as_article',$arr);

//更新數(shù)據(jù)

$arr?=?array(

'as_article_title'='實例化對象',

'as_article_author'='Lee',

);

$where?=?"as_article_id=1";

$res?=?$db-update('as_article',$arr,$where);

//刪除數(shù)據(jù)

$where?=?"as_article_id=1";

$res?=?$db-del('as_article',$where);

求PHP數(shù)據(jù)庫封裝類操作代碼

?php

class MySQL{

private $host; //服務器地址

private $name; //登錄賬號

private $pwd; //登錄密碼

private $dBase; //數(shù)據(jù)庫名稱

private $conn; //數(shù)據(jù)庫鏈接資源

private $result; //結(jié)果集

private $msg; //返回結(jié)果

private $fields; //返回字段

private $fieldsNum; //返回字段數(shù)

private $rowsNum; //返回結(jié)果數(shù)

private $rowsRst; //返回單條記錄的字段數(shù)組

private $filesArray = array(); //返回字段數(shù)組

private $rowsArray = array(); //返回結(jié)果數(shù)組

private $charset='utf8'; //設置操作的字符集

private $query_count=0; //查詢結(jié)果次數(shù)

static private $_instance; //存儲對象

//初始化類

private function __construct($host='',$name='',$pwd='',$dBase=''){

if($host != '') $this-host = $host;

if($name != '') $this-name = $name;

if($pwd != '') $this-pwd = $pwd;

if($dBase != '') $this-dBase = $dBase;

$this-init_conn();

}

//防止被克隆

private function __clone(){}

public static function getInstance($host='',$name='',$pwd='',$dBase=''){

if(FALSE == (self::$_instance instanceof self)){

self::$_instance = new self($host,$name,$pwd,$dBase);

}

return self::$_instance;

}

public function __set($name,$value){

$this-$name=$value;

}

public function __get($name){

return $this-$name;

}

//鏈接數(shù)據(jù)庫

function init_conn(){

$this-conn=@mysql_connect($this-host,$this-name,$this-pwd) or die('connect db fail !');

@mysql_select_db($this-dBase,$this-conn) or die('select db fail !');

mysql_query("set names ".$this-charset);

}

//查詢結(jié)果

function mysql_query_rst($sql){

if($this-conn == '') $this-init_conn();

$this-result = @mysql_query($sql,$this-conn);

$this-query_count++;

}

//取得字段數(shù)

function getFieldsNum($sql){

$this-mysql_query_rst($sql);

$this-fieldsNum = @mysql_num_fields($this-result);

}

//取得查詢結(jié)果數(shù)

function getRowsNum($sql){

$this-mysql_query_rst($sql);

if(mysql_errno() == 0){

return @mysql_num_rows($this-result);

}else{

return '';

}

//取得記錄數(shù)組（單條記錄）

function getRowsRst($sql,$type=MYSQL_BOTH){

$this-mysql_query_rst($sql);

if(empty($this-result)) return '';

if(mysql_error() == 0){

$this-rowsRst = mysql_fetch_array($this-result,$type);

return $this-rowsRst;

}else{

return '';

}

//取得記錄數(shù)組（多條記錄）

function getRowsArray($sql,$type=MYSQL_BOTH){

!empty($this-rowsArray) ? $this-rowsArray=array() : '';

$this-mysql_query_rst($sql);

if(mysql_errno() == 0){

while($row = mysql_fetch_array($this-result,$type)) {

$this-rowsArray[] = $row;

}

return $this-rowsArray;

}else{

return '';

}

//更新、刪除、添加記錄數(shù)

function uidRst($sql){

if($this-conn == ''){

$this-init_conn();

}

@mysql_query($sql);

$this-rowsNum = @mysql_affected_rows();

if(mysql_errno() == 0){

return $this-rowsNum;

}else{

return '';

}

//返回最近插入的一條數(shù)據(jù)庫的id值

function returnRstId($sql){

if($this-conn == ''){

$this-init_conn();

}

@mysql_query($sql);

if(mysql_errno() == 0){

return mysql_insert_id();

}else{

return '';

}

//獲取對應的字段值

function getFields($sql,$fields){

$this-mysql_query_rst($sql);

if(mysql_errno() == 0){

if(mysql_num_rows($this-result) 0){

$tmpfld = @mysql_fetch_row($this-result);

$this-fields = $tmpfld[$fields];

}

return $this-fields;

}else{

return '';

}

//錯誤信息

function msg_error(){

if(mysql_errno() != 0) {

$this-msg = mysql_error();

}

return $this-msg;

}

//釋放結(jié)果集

function close_rst(){

mysql_free_result($this-result);

$this-msg = '';

$this-fieldsNum = 0;

$this-rowsNum = 0;

$this-filesArray = '';

$this-rowsArray = '';

}

//關閉數(shù)據(jù)庫

function close_conn(){

$this-close_rst();

mysql_close($this-conn);

$this-conn = '';

}

//取得數(shù)據(jù)庫版本

function db_version() {

return mysql_get_server_info();

}

PHP訪問MYSQL數(shù)據(jù)庫封裝類(附函數(shù)說明)

復制代碼

代碼如下:

?php

MYSQL

數(shù)據(jù)庫訪問封裝類

MYSQL

數(shù)據(jù)訪問方式，php4支持以mysql_開頭的過程訪問方式，php5開始支持以mysqli_開頭的過程和mysqli面向?qū)ο?/p>

訪問方式，本封裝類以mysql_封裝

數(shù)據(jù)訪問的一般流程：

1,連接數(shù)據(jù)庫

mysql_connect

mysql_pconnect

2,選擇數(shù)據(jù)庫

mysql_select_db

3,執(zhí)行SQL查詢

mysql_query

4,處理返回的數(shù)據(jù)

mysql_fetch_array

mysql_num_rows

mysql_fetch_assoc

mysql_fetch_row

etc

class

db_mysql

{

var

$querynum

;

//當前頁面進程查詢數(shù)據(jù)庫的次數(shù)

var

$dblink

;

//數(shù)據(jù)庫連接資源

//鏈接數(shù)據(jù)庫

function

connect($dbhost,$dbuser,$dbpw,$dbname='',$dbcharset='utf-8',$pconnect=0

$halt=true)

{

$func

empty($pconnect)

'mysql_connect'

'mysql_pconnect'

;

$this-dblink

@$func($dbhost,$dbuser,$dbpw)

;

($halt

!$this-dblink)

{

$this-halt("無法鏈接數(shù)據(jù)庫！");

}

//設置查詢字符集

mysql_query("SET

character_set_connection={$dbcharset},character_set_results={$dbcharset},character_set_client=binary",$this-dblink)

;

//選擇數(shù)據(jù)庫

$dbname

@mysql_select_db($dbname,$this-dblink)

;

}

//選擇數(shù)據(jù)庫

function

select_db($dbname)

{

return

mysql_select_db($dbname,$this-dblink);

}

//執(zhí)行SQL查詢

function

query($sql)

{

$this-querynum++

;

return

mysql_query($sql,$this-dblink)

;

}

//返回最近一次與連接句柄關聯(lián)的INSERT，UPDATE

或DELETE

查詢所影響的記錄行數(shù)

function

affected_rows()

{

return

mysql_affected_rows($this-dblink)

;

}

//取得結(jié)果集中行的數(shù)目,只對select查詢的結(jié)果集有效

function

num_rows($result)

{

return

mysql_num_rows($result)

;

}

//獲得單格的查詢結(jié)果

function

result($result,$row=0)

{

return

mysql_result($result,$row)

;

}

//取得上一步

INSERT

操作產(chǎn)生的

ID,只對表有AUTO_INCREMENT

ID的操作有效

function

insert_id()

{

return

($id

mysql_insert_id($this-dblink))

$id

$this-result($this-query("SELECT

last_insert_id()"),

0);

}

//從結(jié)果集提取當前行，以數(shù)字為key表示的關聯(lián)數(shù)組形式返回

function

fetch_row($result)

{

return

mysql_fetch_row($result)

;

}

//從結(jié)果集提取當前行，以字段名為key表示的關聯(lián)數(shù)組形式返回

function

fetch_assoc($result)

{

return

mysql_fetch_assoc($result);

}

//從結(jié)果集提取當前行，以字段名和數(shù)字為key表示的關聯(lián)數(shù)組形式返回

function

fetch_array($result)

{

return

mysql_fetch_array($result);

}

//關閉鏈接

function

close()

{

return

mysql_close($this-dblink)

;

}

//輸出簡單的錯誤html提示信息并終止程序

function

halt($msg)

{

$message

"html\nhead\n"

;

$message

"meta

content='text/html;charset=gb2312'\n"

;

$message

"/head\n"

;

$message

"body\n"

;

$message

"數(shù)據(jù)庫出錯：".htmlspecialchars($msg)."\n"

;

$message

"/body\n"

;

$message

"/html"

;

echo

$message

;

exit

;

}

當前題目：php數(shù)據(jù)庫連接類封裝 php封裝數(shù)據(jù)庫操作
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