2015.1.9

鉴于我对代码的积累太少导致学习费力,所以我觉得应该多积累一些代码语言。今天通过学习文章发布系统,我对PHP+MySQL有了更深的了解,并且通过上网查找了一些资料。

PHP数据库MySQL链接与操作大全(基础)http://snowcoal.com/article/568.html

PHP调用数据库Mysql操作是很常见的操作,把数据库操作抽象为一个独立的类也是很常见的处理方式。

鉴于新手经常会遇到PHP数据库连接问题,这把将把最基础的连接流程展现出来,至于归类为class的自行处理好了。

本文包含的内容有:数据库的连接,设置编码,增删改查操作

一:连接数据库前的配置操作


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define(
"DB_CONN_HOST"

‘localhost‘
);
//host

define(
"DB_CONN_NAME"

‘my_database‘
);
//database name

define(
"DB_CONN_USER"

‘root‘
);
//username

define(
"DB_CONN_PSWD"

‘‘
);
//passwords

define(
"DB_CONN_CODING"

‘utf8‘
);
//code

define(
"DB_CONN_TYPE"

‘common‘
);
//connect type

二:连接数据库


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if
 
(DB_CONN_TYPE == 
"pconn"
) {

  
//永久链接

  
$conn
 
= mysql_pconnect(DB_CONN_HOST, DB_CONN_USER, DB_CONN_PSWD);

  

else
 
{

  
//即时链接

  
$conn
 
= mysql_connect(DB_CONN_HOST, DB_CONN_USER, DB_CONN_PSWD);

  
}

  
if
 
(!mysql_select_db(DB_CONN_NAME, 
$conn
)) {

  
die
(mysql_error());

  
}
else
{

  
echo
 
"connected"
;
//test

  
}

三:设置连接编码


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mysql_query(
"SET NAMES "
.DB_CONN_CODING);

四:查找操作


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$sqlString
 

"select * from myTable1"
;

  
$res
 
= mysql_query(
$sqlString
);

while
(
$row
 
= mysql_fetch_row(
$res
)){
//dont forget mysql_fetch_array

  
echo
 
$row
[1].
"<br />"
;

  
}

五:扩展Mysql增删改查SQL语句


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增:insert into myTable1(name,age) values(
"zhangSam"
,18);

删:
delete
 
from myTable1 where name=
"zhangSam"
;

改: UPDATE myTable1 SET age=20 where name=
"zhangSam"
;

查: select name,age from myTable1 where 1 order by id desc limit 1;

这五项内容为最常见内容,自行修改测式,要学会举一返三

六:常见问题

1:将内容保保存为数组,常用操作方式


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$resArr
 

array
();

while
(
$row
= mysql_fetch_row(
$res
)){

array_push
(
$resArr
,
$row
[0],
$row
[1]);

}

//echo json_encode($resArr);//for json return

2: 只需查询出影响个数,效率第一


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$sqlString
 

"select count(*) from myTable1"
;
//count(1)

$res
 
= mysql_query(
$sqlString
);

list(
$count
) = @mysql_fetch_row(
$res
);

echo
 
$count
;
//4

只有不断的学习才能不断进步,我相信经过我不懈的努力,我会成长起来。

时间: 2024-10-06 18:29:09

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