利用PHP访问MySql数据库的逻辑操作以及增删改查的实例讲解

<?php //造连接对象$db = new MySQLi("localhost","root","","0710_test");//写SQL语句$sql = "select * from student";//检测连接数据库是否成功，失败返回“连接失败”，并退出程序 if(mysqli_connect_error()){ die("连接失败"); }//执行SQL语句,返回结果集对象$result = $db->query($sql);var_dump($result->num_rows);//判断结果有无数据if($result->num_rows){ echo "存在数据";}//取数据（查询语句）//$arr = $result->fetch_all();//获取所有数据并以二维数组存在//$arr = $result->fetch_all(MYSQLI_ASSOC);//获取所有数据中的关联数组//$arr = $result->fetch_array();//while循环遍历数组所有数据while($arr = $result->fetch_array()){ var_dump($arr);}//$arr = $result->fetch_assoc();//返回关联数组//$arr = $result->fetch_object();//列名对应成员变量//$arr = $result->fetch_row();//返回索引数组//var_dump($arr); //增删改语句//添加一条数据(返回值true或false)$sql = "insert into student values('102','王某','男','1987-7-1','95033')";//删除一条数据(返回值true或false)$sql = "delete from student where Sname='李军'";$r = $db->query($sql);var_dump($r);?>

<?php $db = new MySQLi("localhost","root","","0710_info");if(mysqli_connect_error()){ die("连接失败");}$sql = "insert into work values(0,'P005','2005-01-01','2010-10-1','山师大','教育部',2)";if($db->query($sql)){ echo "添加成功"; //插入这条数据的id(常用) echo $db->insert_id;}else{ echo "添加失败";}?>