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php封装mysql类
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复制代码
代码如下:
?php
class
Mysql
{
private
$host;
private
$user;
private
$pwd;
private
$dbName;
private
$charset;
private
$conn
=
null;
public
function
__construct()
{
$this-host
=
'localhost';
$this-user
=
'root';
$this-pwd
=
'root';
$this-dbName
=
'test';
$this-connect($this-host,$this-user,$this-pwd);
$this-switchDb($this-dbName);
$this-setChar($this-charset);
}
//负责链接
private
function
connect($h,$u,$p)
{
$conn
=
mysql_connect($h,$u,$p);
$this-conn
=
$conn;
}
//负责切换数据库
public
function
switchDb($db)
{
$sql
=
'use'
.
$db;
$this-query($sql);
}
//负责设置字符集
public
function
setChar($char)
{
$sql
=
'set
names'
.
$char;
$this-query($sql);
}
//负责发送sql查询
public
function
query($sql)
{
return
mysql_query($sql,$this-conn);
}
//负责获取多行多列的select结果
public
function
getAll($sql)
{
$list
=
array();
$rs
=
$this-query($sql);
if
(!$rs)
{
return
false;
}
while
($row
=
mysql_fetch_assoc($rs))
{
$list[]
=
$row;
}
return
$list;
}
public
function
getRow($sql)
{
$rs
=
$this-query($sql);
if(!$rs)
{
return
false;
}
return
mysql_fetch_assoc($rs);
}
public
function
getOne($sql)
{
$rs
=
$this-query($sql);
if
(!$rs)
{
return
false;
}
return
mysql_fetch_assoc($rs);
return
$row[0];
}
public
function
close()
{
mysql_close($this-conn);
}
}
echo
'pre';
$mysql
=
new
Mysql();
print_r($mysql);
$sql
=
"insert
into
stu
values
(4,'wangwu','99998')";
if($mysql-query($sql)){
echo
"query成功";
}else
{
echo
"失败";
}
echo
"br
/";
$sql
=
"select
*
from
stu";
$arr
=
$mysql-getAll($sql);
print_r($arr);
?
2. # chmod 755 mysql-standard-5.0.15-linux-gnu-i686-glibc23.tar.gz// 3. # tar xfz mysql-standard-5.0.15-linux-gnu-i686-glibc23.tar.gz //将解压后生成的目录,复制到/usr/local/下并改名为mysql 4. # groupadd mysql # useradd mysql -g mysql // 建立mysql组 //建立mysql用户并且加入到mysql组中 5. # cp /usr/local/mysql/support-files/my-medium.cnf /etc/my.cnf 在support-files目录下有4个模版文件，我们选择其中一个座位Mysql的配置文件，覆盖/etc/my.cnf(系统默认的配置，其中设置了性能参数和Mysql的一些路径参数) 6. # cd /usr/local/mysql # ./scripts/mysql_install_db --user=mysql 进入mysql目录 //初试化表并且规定用mysql用户来访问。初始化表以后就开始给mysql和root用户设定访问权限 7. # chown -R root . //设定root能访问/usr/local/mysql 8. # chown -R mysql data //设定mysql用户能访问/usr/local/mysql/data ,里面存的是mysql的数据库文件.这个目录是在/etc/my.cnf中有配置，在mysql_install_db时产生。 9. # chown -R mysql data/. //设定mysql用户能访问/usr/local/mysql/data/mysql下的所有文件 10. # chgrp -R mysql . //设定mysql组能够访问/usr/local/mysql 11. # /usr/local/mysql/bin/mysqld_safe --user=mysql 运行mysql如果没有问题的话,应该会出现类似这样的提示:[1] 42264# Starting mysqld daemon with databases from /usr/local/mysql/var 如果出现 mysql ended这样的语句，表示Mysql没有正常启动，你可以到log中查找问题，Log文件的通常在/etc/my.cnf中配置。大多数问题是权限设置不正确引起的。
?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;
}
}
本身这就是一个自定义函数，数据需要插入的话需要自己构造sql语句然后通过mysql_query将函数返回的值写入数据库。
想直接让数据库调用PHP的自定义函数是不现实的！
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
;
}
}
?