Php Mysql减少了查询数量

我在表1中有3列：book、key和value

| book |   key    |  value   |    
------------------------------             
|  1   |  author  |    a     |              
|  1   |  editor  |    b     |        
|  1   |  book    |    c     |      

而不是运行三个查询

$data = mysql_query("
      SELECT * FROM table1 WHERE book = '1' AND key = 'author'
             ")  or die(mysql_error());  

while($info = mysql_fetch_array( $data ))
  {
       $value1 = $info['value'];
  }

然后对编辑和书籍重复这个步骤

$value1$value2$value3插入到第页的不同位置

---

我可以用一个问题来解决这个问题吗

要创建$value数组，必须使用以下命令：

$value[] = $info['value'];

与此相反：

$value1 = $info['value'];

此外您可以使用以下代码：

$value[]["key"] = $info['key'];
$value[]["value"] = $info['value'];

---

例如，您可以使用

$value[0][“value”]

Yes调用第一行的值。如果没有“book=1”的其他条目，您只需查询

SELECT * FROM table1 WHERE book = '1'

如果有更多条目，则可以使用此查询：

SELECT * FROM table1 WHERE book = '1' AND key IN('author','editor','book')

然后创建一个关联数组：

while($info = mysqli_fetch_assoc( $data ))
  {
       $value[$info['key']] = $info['value'];
  }

...

echo "the book {$value['book']} was written by {$value['author']}";

---

如果要在单个记录中输入值，请尝试以下操作：

SELECT `t1`.`value` AS `value1`, `t2`.`value` AS `value2`, `t3`.`value` AS `value3`
FROM
    `table1` AS `t1` CROSS JOIN
    `table1` AS `t2` CROSS JOIN
    `table1` AS `t3`
WHERE
    (`t1`.`book` = 1) AND (`t1`.`key` = 'author')
    AND (`t2`.`book` = 1) AND (`t2`.`key` = 'editor')
    AND (`t3`.`book` = 1) AND (`t3`.`key` = 'book');

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谢谢你的回答，那么我该如何调用每个值呢？