php 数据库操作

来源：  http://hi.baidu.com/billows2006/item/435fae47c60540e2bcf45139

//连接数据库 <?php $dbhost = 'localhost'; $dbuser = 'username'; //你的mysql用户名 $dbpass = 'password'; //你的mysql密码 $dbname = 'dbname';   //你的mysql库名

$connect = mysql_connect($dbhost,$dbuser,$dbpass); if ($connect) { echo "连接成功！：）"; } else { echo "连接失败！"; } ?> //SELECT查询 <?php

$db = mysql_connect("localhost", "root");

mysql_select_db("mydb",$db);

$result = mysql_query("SELECT * FROM employees",$db);

printf("First Name: %s<> ", mysql_result($result,0,"first"));

printf("Last Name: %s<> ", mysql_result($result,0,"last"));

printf("Address: %s<> ", mysql_result($result,0,"address"));

printf("Position: %s<> ", mysql_result($result,0,"position"));

?> //while循环 <?php

$db = mysql_connect("localhost", "root");

mysql_select_db("mydb",$db);

$result = mysql_query("SELECT * FROM employees",$db);

echo "< border=1> ";

echo "<><>姓名</td><>职位</td></tr> ";

while ($myrow = mysql_fetch_row($result)) {

printf("<><>%s %s</td><>%s</td></tr> ", $myro w[1], $myrow[2], $myrow[3]);

}

echo "</table> ";

?>

//if-else 判断 <?php

$db = mysql_connect("localhost", "root");

mysql_select_db("mydb",$db);

$result = mysql_query("SELECT * FROM employees",$db);

if ($myrow = mysql_fetch_array($result)) {

echo "< border=1> ";

echo "<><>姓名</td><>住址</td></tr> ";

do {

printf("<><>%s %s</td><>%s</tr> ", $myrow["first"], $myrow["last"], $myrow["address"]);

} while ($myrow = mysql_fetch_array($result));

echo "</table> ";

} else {

echo "对不起，没有找到记录！";

}

?> //向服务器发送数据 首先，我们创建一个带有简单表格的网页。 <form method="post" action="<?php echo $PATH_INFO?>">

名：< type="Text" name="first"><>

姓：< type="Text" name="last"><>

住址：< type="Text" name="address"><>

职位：< type="Text" name="position"><>

< type="Submit" name="submit" value="输入信息">

</form> //处理数据 <?php

if ($submit) {

       // 处理表格输入

    $db = mysql_connect("localhost", "root");

    mysql_select_db("mydb",$db);

    $sql = "INSERT INTO employees (first,last,address,position)     VALUES ('$first','$last','$address','$position')";

    $result = mysql_query($sql);

    echo "Thank you! Information entered. ";

} else{

       // 显示表格内容

    ?>

    < method="post" action="<?php echo $PATH_INFO?>">        名：< type="Text" name="first"><>        姓：< type="Text" name="last"><>        住址：< type="Text" name="address"><>

    职位：< type="Text" name="position"><>

    < type="Submit" name="submit" value="输入信息">

    </form>

    <?php

} // end if，if结束

?>