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
*** 作产生的
ID,只对表有AUTO_INCREMENT
ID的 *** 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/htmlcharset=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
}
}
?>
php封装mysql类复制代码
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)
?>
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