Php 如何使用 bind_result 与 get_result 的示例

尽管这两种方法都适用于*个查询，但当使用bind_result()时，列通常会在查询中显式列出，因此在bind_result()中分配返回值时可以参考列表，因为变量的顺序必须严格匹配返回行的 struct .

Example 1 for $query1 using bind_result()

$query1 = 'SELECT id, first_name, last_name, username FROM `table` WHERE id = ?';
$id = 5;

$stmt = $mysqli->prepare($query1);
/*
    Binds variables to prepared statement

    i    corresponding variable has type integer
    d    corresponding variable has type double
    s    corresponding variable has type string
    b    corresponding variable is a blob and will be sent in packets
*/
$stmt->bind_param('i',$id);

/* execute query */
$stmt->execute();

/* Store the result (to get properties) */
$stmt->store_result();

/* Get the number of rows */
$num_of_rows = $stmt->num_rows;

/* Bind the result to variables */
$stmt->bind_result($id, $first_name, $last_name, $username);

while ($stmt->fetch()) {
    echo 'ID: '.$id.'<br>';
    echo 'First Name: '.$first_name.'<br>';
    echo 'Last Name: '.$last_name.'<br>';
    echo 'Username: '.$username.'<br><br>';
}

Example 2 for $query2 using get_result()

$query2 = 'SELECT * FROM `table` WHERE id = ?'; 
$id = 5;

$stmt = $mysqli->prepare($query2);
/*
    Binds variables to prepared statement

    i    corresponding variable has type integer
    d    corresponding variable has type double
    s    corresponding variable has type string
    b    corresponding variable is a blob and will be sent in packets
*/
$stmt->bind_param('i',$id);

/* execute query */
$stmt->execute();

/* Get the result */
$result = $stmt->get_result();

/* Get the number of rows */
$num_of_rows = $result->num_rows;

while ($row = $result->fetch_assoc()) {
    echo 'ID: '.$row['id'].'<br>';
    echo 'First Name: '.$row['first_name'].'<br>';
    echo 'Last Name: '.$row['last_name'].'<br>';
    echo 'Username: '.$row['username'].'<br><br>';
}

bind_result()

Pros:

• 适用于过时的PHP版本
• 返回单独的变量

Cons:

• 所有变量都必须手动列出
• 需要更多代码才能将行作为数组返回
• 每次更改表 struct 时，都必须更新代码

get_result()

Pros:

• 返回关联/枚举数组或对象，自动填充返回行中的数据
• 允许fetch_all()方法一次返回所有返回的行

Cons:

• 需要MySQL本机驱动程序(mysqlnd)