PHP自5.5起，已经完全废除mysql扩展，官方推荐使用MySQLI或PDO来代替。这篇文章主要讲mysqli的一些基本操作。使用mysqli有两个风格的写法，对象式或函数式，下面我们只展示函数式的写法风格。
数据库连接
首先肯定需要连接数据库。连接数据前，我们需要准备的一般有数据库的账号、密码、端口号、数据库名。
因为网络原因或其他原因经常会有连接不上数据库的情况，所以，我们需要做连接失败的处理。
<?php// 数据库连接$mysqli = mysqli_connect( 'localhost', 'root', '', 'test');if (mysqli_connect_errno()) { throw new Exception('databases connect error：' .mysqli_connect_error());}// ...一些数据库操作// 关闭数据库资源mysqli_close($mysqli);
设置字符集
设置字符集使用mysqli_set_charset();
字符集目前我们大都使用utf8mb4，因为他支持4个字节长度的字符。他支持一些emoji表情字符。当然如果你不需要支持4字节字符的话可以选择使用utf8,因为他比较剩空间。
mysqli_set_chartset($mysqli, 'utf8mb4');
重新选择数据库
数据库连接后，还可以重新选择数据库。
mysqli_select_db($mysqli, '数据库名');
CURD操作
mysqli_query()：对数据库执行一次操作，DDL、DQL 、DML都支持。
mysqli_affected_rows()：获取影响记录行数。
新增数据操作
mysqli_query($mysqli, "INSERT INTO users(username, age, sex) VALUES('周杰伦', 35, '男'), ('谢霆锋', 35, '男')");if (mysqli_affected_rows($mysqli) <= 0) { throw new Exception('databases insert error:' . mysqli_error($mysqli));}
修改数据操作
这里面有一个注意点，mysqli_affected_rows返回的值为0的情况。它更新的信息与上次完全一样，这个情况很普遍。比如说在修改的时候，连续点击了多次修改按钮。但并不能说明程序代码有问题。所以，和新增不一样的是，返回0也应该是成功状态。
mysqli_query($mysqli, "UPDATE users SET age=40 WHERE user_id = 1");if (mysqli_affected_rows($mysqli) < 0) { throw new Exception('databases update error:' . mysqli_error($mysqli));}
删除数据操作
注意：修改和删除操作必须加where条件，不然将会修改整个表的数据，后果不堪设想（删库跑路o(╯□╰)o）。
mysqli_query($mysqli, "Delete FROM users WHERE user_id = 100");if (mysqli_affected_rows($mysqli) <= 0) { throw new Exception('databases delete error:' . mysqli_error($mysqli));}
查询操作
当mysqli_query执行的是一条查询语句时，该函数会返回mysqli_result结果集。
mysqli_fetch_all()从结果集中获取全部数据。该函数第二个参数可以指定返回数据的格式。分别为：
-
MYSQLI_NUM：返回索引数组
-
MYSQLI_ASSOC：返回关联数组
-
MYSQLI_BOTH：既有索引数组也有关联数组
另外需要注意，对结果集的操作结束后，记得销毁结果集资源。
// 数据库连接$mysqli = mysqli_connect( 'localhost', 'root', '', 'test');if (mysqli_connect_errno()) { throw new Exception('databases connect error：' .mysqli_connect_error());}mysqli_set_charset($mysqli, 'utf8mb4');$result = mysqli_query($mysqli, "SELECT * FROM users");if (mysqli_affected_rows($mysqli) < 0) { throw new Exception('databases select error:' . mysqli_error($mysqli));}$users = mysqli_fetch_all($result, MYSQLI_ASSOC);// 销毁结果集资源mysqli_free_result($result);// 关闭数据库资源mysqli_close($mysqli);
以上就是Mysqli基本操作，个人实际学习开发总结，欢迎讨论！
以上就是Mysqli的基本操作-CURD的学习开发总结的详细内容，更多请关注求知技术网其它相关文章！
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