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php查询数据库封装 php封装mysql
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PHP中对数据库操作的封装，有什么好的例子吗
类文件mysql.class.php：
?php
class Mysql{
//数据库连接返回值
private $conn;
/**
* [构造函数，返回值给$conn]
* @param [string] $hostname [主机名]
* @param [string] $username[用户名]
* @param [string] $password[密码]
* @param [string] $dbname[数据库名]
* @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 '连接失败，请联系管理员';
exit;
}
$this-conn = $config;
$res = mysql_select_db($dbname);
if(!$res){
echo '连接失败，请联系管理员';
exit;
}
mysql_set_charset($charset);
}
function __destruct(){
mysql_close();
}
/**
* [getAll 获取所有信息]
* @param [string] $sql [sql语句]
* @return [array] [返回二维数组]
*/
function getAll($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 获取单条数据]
* @param [string] $sql [sql语句]
* @return [array] [返回一维数组]
*/
function getOne($sql){
$result = mysql_query($sql,$this-conn);
$data = array();
if($result mysql_num_rows($result)0){
$data = mysql_fetch_assoc($result);
}
return $data;
}
/**
* [getOne 获取单条数据]
* @param [string] $table [表名]
* @param [string] $data [由字段名当键，属性当键值的一维数组]
* @return [type] [返回false或者插入数据的id]
*/
function insert($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 更新数据库]
* @param [string] $table [表名]
* @param [array] $data [更新的数据，由字段名当键，属性当键值的一维数组]
* @param [string] $where [条件，‘字段名’=‘字段属性’]
* @return [type] [更新成功返回影响的行数，更新失败返回false]
*/
function update($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 删除数据]
* @param [string] $table [表名]
* @param [string] $where [条件，‘字段名’=‘字段属性’]
* @return [type] [成功返回影响的行数，失败返回false]
*/
function del($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
//包含数据库操作类文件
include 'mysql.class.php';
//设置传入参数
$hostname='localhost';
$username='root';
$password='123456';
$dbname='aisi';
$charset = 'utf8';
//实例化对象
$db = new Mysql($hostname,$username,$password,$dbname);
//获取一条数据
$sql = "SELECT count(as_article_id) as count FROM as_article where as_article_type_id=1";
$count = $db-getOne($sql);
//获取多条数据
$sql = "SELECT * FROM as_article where as_article_type_id=1 order by as_article_addtime desc limit $start,$limit";
$service = $db-getAll($sql);
//插入数据
$arr = array(
'as_article_title'='数据库操作类',
'as_article_author'='rex',
);
$res = $db-insert('as_article',$arr);
//更新数据
$arr = array(
'as_article_title'='实例化对象',
'as_article_author'='Lee',
);
$where = "as_article_id=1";
$res = $db-update('as_article',$arr,$where);
//删除数据
$where = "as_article_id=1";
$res = $db-del('as_article',$where);
?
相关问答
Q1: 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;
}
}
Q2: 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();
}
}
Q3: 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
=
;
//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))
=
?
$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\nhead\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
;
}
}
?
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