PHP-Mysqli扩展库的预编译

 1 // dml语句的预编译
 2 // 1.连接数据库
 3 $mysqli = new MySQLi(‘localhost‘,‘root‘,‘root‘,‘lianxi‘);
 4 if(mysqli_connect_errno()){
 5     echo ‘连接失败 ‘.$mysqli->connect_error;
 6 }
 7 $mysqli->query(‘set names utf8‘);
 8 // 2.进行预编译
 9 // 问号是占位符
10 $sql = ‘insert into student values (?,?,?,?,?)‘;
11 // 通过MySQLi类的prepare()方法对sql模板进行编译，返回一个MySQLi_STMT类对象
12 $stmt = $mysqli->prepare($sql) or die($mysqli->connect_error);
13 // 利用MySQLi_STMT类中的bind_param()方法绑定参数。第一个参数表示各个字段的类型，i(int)、s(string)、d(double)
14 $stmt->bind_param(‘isdii‘,$id,$name,$height,$gender,$classId);
15 // 3.利用MySQLi_STMT类中的execute()方法插入数据
16 $id = null;
17 $name = ‘Mildred‘;
18 $height = 165.00;
19 $gender = 2;
20 $classId = 12;
21 $stmt->execute() or die($stmt->error);
22 // 继续插入数据
23 $id = null;
24 $name = ‘Shaw‘;
25 $height = 174.50;
26 $gender = 1;
27 $classId = 11;
28 $stmt->execute() or die($stmt->error);
29 
30 // 关闭连接
31 $stmt->close();
32 $mysqli->close();

 1 // dql语句的预编译
 2 // 1.连接数据库
 3 $mysqli = new MySQLi(‘localhost‘,‘root‘,‘root‘,‘lianxi‘);
 4 if(mysqli_connect_error()){
 5     die(‘连接失败 ‘.$mysqli->connect_error);
 6 }
 7 $mysqli->query(‘set names utf8‘);
 8 // 2.编译sql语句
 9 $sql = ‘select * from student where id>?‘;
10 $stmt = $mysqli->prepare($sql) or die($mysqli->error);
11 // 3.绑定参数
12 $stmt->bind_param(‘i‘,$id);
13 // 4.绑定结果集
14 $stmt->bind_result($id,$name,$height,$gender,$classId);
15 // 5.执行
16 $id = 2;
17 $stmt->execute();
18 // 6.利用MySQLi_STMT类中的fetch()方法，通过循环得到查询的数据
19 while($stmt->fetch()){
20     echo $id.‘--‘.$name.‘--‘.$height.‘--‘.$gender.‘--‘.$classId;
21     echo ‘<br>‘;
22 }
23 // 7.关闭连接
24 $stmt->free_result();
25 $stmt->close();
26 $mysqli->close();