php封装数据库类
楼主整理代码会好一点
2. php封装一个class类实现mysql数据库的增删该查
<?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() {} //覆盖__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 $this;}
//条件
public function where($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;
}
/**
* 返回查询数据
* @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) ){ // 获取当前新增的ID
if($this->db->insert_id){
return $this->db->insert_id;
}
if($this->db->affected_rows){
return true;
}
}
return FALSE;
}
//直接执行sql
public function runSql($sql){
accessLog('db_access',$sql);
if( FALSE != $this->db->query($sql) ){ // 获取当前新增的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) ){ // 获取当前新增的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) ){ // 获取当前新增的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,$newcol);
}
//崩溃信息
private function crash($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;
}
}
3. 最好用的PHP数据库操作类-ezSQL
ezSQL是一个非常好用的PHP数据库操作类 着名的开源博客WordPress的数据库操作就使用了ezSQL的MySQL部分 该数据库操作类支持几乎所有主流的数据库 如 PHP PDO mySQL Oracle InterBase/FireBird PostgreSQL SQLite以及MS SQL等 ezSQL具有很强的调试功能 可以快速地查看SQL代码的执行情况 使用ezSQL 可以为我们节省开发时间 简化代码并提高运行效率
ezSQL的优点就不用多说了 它小巧 快速 简单 易用 并且开源 还有就是安全 你没想到的细节它都为你考虑了 你只需要在你的脚本开头包含相关的PHP文件 然后你就可以使用更好用的一套ezSQL函数来代替标准的PHP数据库操作函数
下面是ezSQL中一些主要的函数
$db >get_results 从数据库中读取数据集
$db >get_row 从数据库中读取一行数据
$db >get_col 从数据库中读取一列指定的数据集
$db >get_var 从数据库的数据集中读取一个值
$db >query 执行一条SQL语句
$db >debug 打印最后执行的SQL语句及其返回的结果
$db >varmp 打印变量的结构及其内容
$db >select 选择一个新数据库
$db >get_col_info 获取列的信息
$db >hide_errors 隐藏错误
$db >show_errors 显示错误
ezSQL的使用方法很简单 首先下载ezSQL源代码 然后将ez_sql_core php文件和ez_sql_mysql php文件(这里以mySQL为例)放到与你的脚本文件相同的目录下 然后将下面的代码添加到你的脚本文件的最前面 这样就可以正常使用ezSQL了
<?php// 包含ezSQL的核心文件include_once"ez_sql_core php";// 包含ezSQL具体的数据库文件 这里以mySQL为例include_once"ez_sql_mysql php";// 初始化数据库对象并建立数据库连接$db=newezSQL_mysql( db_user db_password db_name db_host );?>
下面是ezSQL中一些主要函数的应用实例 这些代码均来自于ezSQL的官方帮助文档
实例一
// Select multiple records from the database and print them out $users=$db >get_results("SELECT name email FROM users");foreach($usersas$user){ // Access data using object syntax echo$user >name; echo$user >email;}
实例二
// Get one row from the database and print it out $user=$db >get_row("SELECT name email FROM users WHERE id = ");echo$user >name;echo$user >email;
实例三
// Get one variable from the database and print it out $var=$db >get_var("SELECT count(*) FROM users");echo$var;
实例四
// Insert into the database$db >query("INSERT INTO users (id name email) VALUES (NULL justin jv@foo )");
实例五
// Update the database$db >query("UPDATE users SET name = Justin WHERE id = )");
实例六
// Display last query and all associated results$db >debug();
实例七
// Display the structure and contents of any result(s) or any variable$results=$db >get_results("SELECT name email FROM users");$db >varmp($results);
实例八
// Get one column (based on column index) and print it out $names=$db >get_col("SELECT name email FROM users" )foreach($namesas$name){ echo$name;}
实例九
// Same as above ‘but quicker’foreach($db >get_col("SELECT name email FROM users" )as$name){ echo$name;}
实例十
lishixin/Article/program/PHP/201311/21297
4. PHP访问MYSQL数据库封装类(附函数说明)
复制代码
代码如下:
<?php
/*
MYSQL
数据库访问封装类
MYSQL
数据访问方式，php4支持以mysql_开头的过程访问方式，php5开始支持以mysqli_开头的过程和mysqli面向对象
访问方式，本封装类以mysql_封装
数据访问的一般流程：
1,连接数据库
mysql_connect
or
mysql_pconnect
2,选择数据库
mysql_select_db
3,执行SQL查询
mysql_query
4,处理返回的数据
mysql_fetch_array
mysql_num_rows
mysql_fetch_assoc
mysql_fetch_row
etc
*/
class
db_mysql
{
var
$querynum
=
0
;
//当前页面进程查询数据库的次数
var
$dblink
;
//数据库连接资源
//链接数据库
function
connect($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)
{
$this->halt("无法链接数据库！");
}
//设置查询字符集
mysql_query("SET
character_set_connection={$dbcharset},character_set_results={$dbcharset},character_set_client=binary",$this->dblink)
;
//选择数据库
$dbname
&&
@mysql_select_db($dbname,$this->dblink)
;
}
//选择数据库
function
select_db($dbname)
{
return
mysql_select_db($dbname,$this->dblink);
}
//执行SQL查询
function
query($sql)
{
$this->querynum++
;
return
mysql_query($sql,$this->dblink)
;
}
//返回最近一次与连接句柄关联的INSERT，UPDATE
或DELETE
查询所影响的记录行数
function
affected_rows()
{
return
mysql_affected_rows($this->dblink)
;
}
//取得结果集中行的数目,只对select查询的结果集有效
function
num_rows($result)
{
return
mysql_num_rows($result)
;
}
//获得单格的查询结果
function
result($result,$row=0)
{
return
mysql_result($result,$row)
;
}
//取得上一步
INSERT
操作产生的
ID,只对表有AUTO_INCREMENT
ID的操作有效
function
insert_id()
{
return
($id
=
mysql_insert_id($this->dblink))
>=
0
?
$id
:
$this->result($this->query("SELECT
last_insert_id()"),
0);
}
//从结果集提取当前行，以数字为key表示的关联数组形式返回
function
fetch_row($result)
{
return
mysql_fetch_row($result)
;
}
//从结果集提取当前行，以字段名为key表示的关联数组形式返回
function
fetch_assoc($result)
{
return
mysql_fetch_assoc($result);
}
//从结果集提取当前行，以字段名和数字为key表示的关联数组形式返回
function
fetch_array($result)
{
return
mysql_fetch_array($result);
}
//关闭链接
function
close()
{
return
mysql_close($this->dblink)
;
}
//输出简单的错误html提示信息并终止程序
function
halt($msg)
{
$message
=
"<html>\n<head>\n"
;
$message
.=
"<meta
content='text/html;charset=gb2312'>\n"
;
$message
.=
"</head>\n"
;
$message
.=
"<body>\n"
;
$message
.=
"数据库出错：".htmlspecialchars($msg)."\n"
;
$message
.=
"</body>\n"
;
$message
.=
"</html>"
;
echo
$message
;
exit
;
}
}
?>
5. 求PHP数据库封装类操作代码
<?php
class MySQL{
private $host; //服务器地址
private $name; //登录账号
private $pwd; //登录密码
private $dBase; //数据库名称
private $conn; //数据库链接资源
private $result; //结果集
private $msg; //返回结果
private $fields; //返回字段
private $fieldsNum; //返回字段数
private $rowsNum; //返回结果数
private $rowsRst; //返回单条记录的字段数组
private $filesArray = array(); //返回字段数组
private $rowsArray = array(); //返回结果数组
private $charset='utf8'; //设置操作的字符集
private $query_count=0; //查询结果次数
static private $_instance; //存储对象
//初始化类
private function __construct($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;
}
//链接数据库
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 ".$this->charset);
}
//查询结果
function mysql_query_rst($sql){
if($this->conn == '') $this->init_conn();
$this->result = @mysql_query($sql,$this->conn);
$this->query_count++;
}
//取得字段数
function getFieldsNum($sql){
$this->mysql_query_rst($sql);
$this->fieldsNum = @mysql_num_fields($this->result);
}
//取得查询结果数
function getRowsNum($sql){
$this->mysql_query_rst($sql);
if(mysql_errno() == 0){
return @mysql_num_rows($this->result);
}else{
return '';
}
}
//取得记录数组（单条记录）
function getRowsRst($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 $this->rowsRst;
}else{
return '';
}
}
//取得记录数组（多条记录）
function getRowsArray($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 $this->rowsArray;
}else{
return '';
}
}
//更新、删除、添加记录数
function uidRst($sql){
if($this->conn == ''){
$this->init_conn();
}
@mysql_query($sql);
$this->rowsNum = @mysql_affected_rows();
if(mysql_errno() == 0){
return $this->rowsNum;
}else{
return '';
}
}
//返回最近插入的一条数据库的id值
function returnRstId($sql){
if($this->conn == ''){
$this->init_conn();
}
@mysql_query($sql);
if(mysql_errno() == 0){
return mysql_insert_id();
}else{
return '';
}
}
//获取对应的字段值
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 '';
}
}
//错误信息
function msg_error(){
if(mysql_errno() != 0) {
$this->msg = mysql_error();
}
return $this->msg;
}
//释放结果集
function close_rst(){
mysql_free_result($this->result);
$this->msg = '';
$this->fieldsNum = 0;
$this->rowsNum = 0;
$this->filesArray = '';
$this->rowsArray = '';
}
//关闭数据库
function close_conn(){
$this->close_rst();
mysql_close($this->conn);
$this->conn = '';
}
//取得数据库版本
function db_version() {
return mysql_get_server_info();
}
}