mysqli_config.php
实例
<?php /** * 配置数据库连接参数 */ define ('DB_HOST', 'localhost'); define ('DB_USER', 'root'); define ('DB_PASS', 'root'); define ('DB_NAME', 'php'); define ('DB_CHAR', 'utf8');
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mysqli_connect.php
实例
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/4/24 * Time: 9:12 */ /* *创建连接,返回连接资源 *判断连接成功 *选择数据表 *设置字符集 */ //导入数据库连接参数 require 'mysqli_config.php'; //2. 调用连接函数,成功则返回mysqli对象,失败返回false $db = @mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME) or die("连接失败"); //echo '<h1>连接成功</h1>'; //5. 设置默认字符集 mysqli_set_charset($db, DB_CHAR);
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mysqli_delete.php
实例
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/24
* Time: 9:17
*/
require 'mysqli_connect.php';
$sql="DELETE FROM staff WHERE name='灭绝师太';";
if (mysqli_query($db,$sql)) {
if (mysqli_affected_rows($db)>0) {
echo '成功删除了'.mysqli_affected_rows($db).'条记录';
} else {
echo '没有记录被删除';
}
} else {
exit(mysqli_errno($db).':'.mysqli_error($db));
}
mysqli_close($db);
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/24
* Time: 9:17
*/
require 'mysqli_connect.php';
$sql="DELETE FROM staff WHERE name='灭绝师太';";
if (mysqli_query($db,$sql)) {
if (mysqli_affected_rows($db)>0) {
echo '成功删除了'.mysqli_affected_rows($db).'条记录';
} else {
echo '没有记录被删除';
}
} else {
exit(mysqli_errno($db).':'.mysqli_error($db));
}
mysqli_close($db);
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mysqli_insert.php
实例
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/4/24 * Time: 9:18 */ require 'mysqli_connect.php'; $sql="INSERT INTO staff (name,sex,age,salary) VALUES ('梅超风',1,30,6000);"; if (mysqli_query($db,$sql)) { if (mysqli_affected_rows($db)>0) { echo "新增了".mysqli_affected_rows($db)."条记录,<br>新纪录主键id:" .mysqli_insert_id($db); } else { echo "没有记录被新增"; } } else { exit(mysqli_errno($db).':'.mysqli_error($db)); } mysqli_close($db);
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mysqli_multiquery.php
实例
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/4/24 * Time: 9:21 */ require 'mysqli_connect.php'; $sql="SELECT sex,ROUND(AVG(salary),2) FROM staff GROUP BY sex;"; $sql.="SELECT name,age FROM staff WHERE age>50;"; $sql.="SELECT name,salary FROM staff WHERE salary>5000;"; $num=1; if (mysqli_multi_query($db,$sql)) { echo $num.'结果子集<br>'; // 获取当前子结果集 while ($res=mysqli_store_result($db)) { if (mysqli_affected_rows($db)>0) { while ($row=mysqli_fetch_array($res,MYSQLI_ASSOC)) { print_r($row); echo "<br>"; } mysqli_free_result($res); } else { echo '没有满足结果的数据'; } if (mysqli_more_results($db)) { $num++; echo '<hr>第'.$num.'个结果子集的数据<br>'; mysqli_next_result($db); } } } else { exit(mysqli_errno($db).':'.mysqli_error($db)); } mysqli_close($db);
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mysqli_query.php
实例
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/4/24 * Time: 9:16 */ require 'mysqli_connect.php'; $sql="SELECT name,age FROM staff;"; if ($res=mysqli_query($db,$sql)) { if (mysqli_num_rows($res)>0) { while ($row=mysqli_fetch_assoc($res)) { var_export(print_r($row),true); echo "<hr>"; } } } else { exit(mysqli_errno($db).':'.mysqli_error($db)); } // 释放结果集,只对select mysqli_free_result($res); mysqli_close($db);
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mysqli_update.php
实例
<?php /** * Created by PhpStorm. * User: Administrator * Date: 2018/4/24 * Time: 9:20 */ require 'mysqli_connect.php'; $sql="UPDATE staff SET salary=7000 WHERE name='杨过';"; if (mysqli_query($db,$sql)){ if(mysqli_affected_rows($db)>0) { echo '成功更新了'.mysqli_affected_rows($db).'条记录'; } else { echo '没有更新'; } } else { exit(mysqli_errno($db).':'.mysqli_error($db)); } mysqli_close($db);
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效果图
总结:
在网站开发过程中,我们是绝对实用MySQL的,因为需要进行数据存储等,在网站存储数据是用到增删改查操作是必须要学习知识。