PHP入门

1,连接数据库

<? php

$dbhost   =  localhost; 
$dbuser   =  root;  // 你的mysql用户名 
$dbpass   =   123456 ;  // 你的mysql密码 
$dbname   =  data;  // 你的mysql库名 

//连接本地数据库
$GLOBALS [ " conn " ]  =   mysql_connect ( $dbhost , $dbuser , $dbpass ); 

// 打开数据库
mysql_select_db ( $dbname , $GLOBALS [ " conn " ]);

?>

2.读取数据库中,某一字段值

<? php

// 读取一列数据
$sql = " select * from ec_admin " ;
$result   =   mysql_query ( $sql , $GLOBALS [ " conn " ]);

printf ( " 用户名: %s<br>\n " ,   mysql_result ( $result , 3 , " UserName " ));
printf ( " 密码: %s<br>\n " ,   mysql_result ( $result , 3 , " UserPass " ));

?>

3,插入某一条数据

<? php
   $sql = " insert into ec_admin(UserName,UserPass) values(liugongxun2,jakemary2) " ;
   $result = mysql_query ( $sql , $GLOBALS [ " conn " ])or  die ( mysql_error ());
?>

4,while循环

<? php

$sql = " select * from ec_admin " ;
$result   =   mysql_query ( $sql , $GLOBALS [ " conn " ]);
while ( $myrow   =   mysql_fetch_row ( $result ))
{
  printf ( " 用户名%s %s密码<br /> " , $myrow [ 1 ] , $myrow [ 2 ]); 
}

?>

5,do while循环

<? php

$sql = " select * from ec_admin " ;
$result   =   mysql_query ( $sql , $GLOBALS [ " conn " ]);
if ( $myrow   =   mysql_fetch_array ( $result ))
{
  do
 {
  printf ( " 用户名%s %s密码<br /> " , $myrow [ " UserName " ] , $myrow [ " UserPass " ]); 
 } while ( $myrow   =   mysql_fetch_array ( $result ));
}
?>

6,判断表单是否提交

<? php

if  ( $submit )

{}

?>