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PHP采用pdo方式訪問數據庫時,您不必再使用再為它們封裝數據庫操作類,只需要使用PDO接口中的方法就可以對各種數據庫進行操作。
?php
class MySQL{
private $host; //服務器地址
private $name; //登錄賬號
private $pwd; //登錄密碼
private $dBase; //數據庫名稱
private $conn; //數據庫鏈接資源
private $result; //結果集
private $msg; //返回結果
private $fields; //返回字段
private $fieldsNum; //返回字段數
private $rowsNum; //返回結果數
private $rowsRst; //返回單條記錄的字段數組
private $filesArray = array(); //返回字段數組
private $rowsArray = array(); //返回結果數組
private $charset='utf8'; //設置操作的字符集
private $query_count=0; //查詢結果次數
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;
}
//鏈接數據庫
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);
$this-query_count++;
}
//取得字段數
function getFieldsNum($sql){
$this-mysql_query_rst($sql);
$this-fieldsNum = @mysql_num_fields($this-result);
}
//取得查詢結果數
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 $this-rowsArray;
}else{
return '';
}
}
//更新、刪除、添加記錄數
function uidRst($sql){
if($this-conn == ''){
$this-init_conn();
}
@mysql_query($sql);
$this-rowsNum = @mysql_affected_rows();
if(mysql_errno() == 0){
return $this-rowsNum;
}else{
return '';
}
}
//返回最近插入的一條數據庫的id值
function returnRstId($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 = '';
}
//關閉數據庫
function close_conn(){
$this-close_rst();
mysql_close($this-conn);
$this-conn = '';
}
//取得數據庫版本
function db_version() {
return mysql_get_server_info();
}
}
?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;
}
/**
* 返回查詢數據
* @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;
}
}
復制代碼
代碼如下:
?php
/*
MYSQL
數據庫訪問封裝類
MYSQL
數據訪問方式,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面向對象
訪問方式,本封裝類以mysql_封裝
數據訪問的一般流程:
1,連接數據庫
mysql_connect
or
mysql_pconnect
2,選擇數據庫
mysql_select_db
3,執行SQL查詢
mysql_query
4,處理返回的數據
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據庫的次數
var
$dblink
;
//數據庫連接資源
//鏈接數據庫
function
connect($dbhost,$dbuser,$dbpw,$dbname='',$dbcharset='utf-8',$pconnect=0
,
$halt=true)
{
$func
=
empty($pconnect)
?
'mysql_connect'
:
'mysql_pconnect'
;
$this-dblink
=
@$func($dbhost,$dbuser,$dbpw)
;
if
($halt
!$this-dblink)
{
$this-halt("無法鏈接數據庫!");
}
//設置查詢字符集
mysql_query("SET
character_set_connection={$dbcharset},character_set_results={$dbcharset},character_set_client=binary",$this-dblink)
;
//選擇數據庫
$dbname
@mysql_select_db($dbname,$this-dblink)
;
}
//選擇數據庫
function
select_db($dbname)
{
return
mysql_select_db($dbname,$this-dblink);
}
//執行SQL查詢
function
query($sql)
{
$this-querynum++
;
return
mysql_query($sql,$this-dblink)
;
}
//返回最近一次與連接句柄關聯的INSERT,UPDATE
或DELETE
查詢所影響的記錄行數
function
affected_rows()
{
return
mysql_affected_rows($this-dblink)
;
}
//取得結果集中行的數目,只對select查詢的結果集有效
function
num_rows($result)
{
return
mysql_num_rows($result)
;
}
//獲得單格的查詢結果
function
result($result,$row=0)
{
return
mysql_result($result,$row)
;
}
//取得上一步
INSERT
操作產生的
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);
}
//從結果集提取當前行,以數字為key表示的關聯數組形式返回
function
fetch_row($result)
{
return
mysql_fetch_row($result)
;
}
//從結果集提取當前行,以字段名為key表示的關聯數組形式返回
function
fetch_assoc($result)
{
return
mysql_fetch_assoc($result);
}
//從結果集提取當前行,以字段名和數字為key表示的關聯數組形式返回
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"
;
$message
.=
"數據庫出錯:".htmlspecialchars($msg)."\n"
;
$message
.=
"/body\n"
;
$message
.=
"/html"
;
echo
$message
;
exit
;
}
}
?
類文件mysql.class.php:
?php
class?Mysql{
//數據庫連接返回值
private?$conn;
/**
*?[構造函數,返回值給$conn]
*?@param?[string]?$hostname?[主機名]
*?@param?[string]?$username[用戶名]
*?@param?[string]?$password[密碼]
*?@param?[string]?$dbname[數據庫名]
*?@param?[string]?$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,請聯系管理員';
exit;
}
$this-conn?=?$config;
$res?=?mysql_select_db($dbname);
if(!$res){
echo?'連接失敗,請聯系管理員';
exit;
}
mysql_set_charset($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?$data;
}
/**
*?[getOne?獲取單條數據]
*?@param?[string]?$sql?[sql語句]
*?@return?[array]?[返回一維數組]
*/
function?getOne($sql){
$result?=?mysql_query($sql,$this-conn);
$data?=?array();
if($result??mysql_num_rows($result)0){
$data?=?mysql_fetch_assoc($result);
}
return?$data;
}
/**
*?[getOne?獲取單條數據]
*?@param?[string]?$table?[表名]
*?@param?[string]?$data?[由字段名當鍵,屬性當鍵值的一維數組]
*?@return?[type]?[返回false或者插入數據的id]
*/
function?insert($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?更新數據庫]
*?@param?[string]?$table?[表名]
*?@param?[array]?$data?[更新的數據,由字段名當鍵,屬性當鍵值的一維數組]
*?@param?[string]?$where?[條件,‘字段名’=‘字段屬性’]
*?@return?[type]?[更新成功返回影響的行數,更新失敗返回false]
*/
function?update($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?刪除數據]
*?@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,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
//包含數據庫操作類文件
include?'mysql.class.php';
//設置傳入參數
$hostname='localhost';
$username='root';
$password='123456';
$dbname='aisi';
$charset?=?'utf8';
//實例化對象
$db?=?new?Mysql($hostname,$username,$password,$dbname);
//獲取一條數據
$sql?=?"SELECT?count(as_article_id)?as?count?FROM?as_article?where?as_article_type_id=1";
$count?=?$db-getOne($sql);
//獲取多條數據
$sql?=?"SELECT?*?FROM?as_article?where?as_article_type_id=1?order?by?as_article_addtime?desc?limit?$start,$limit";
$service?=?$db-getAll($sql);
//插入數據
$arr?=?array(
'as_article_title'='數據庫操作類',
'as_article_author'='rex',
);
$res?=?$db-insert('as_article',$arr);
//更新數據
$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);
//刪除數據
$where?=?"as_article_id=1";
$res?=?$db-del('as_article',$where);
?
名稱欄目:php封裝數據庫方法,php封裝函數
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