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用一条mysql语句插入多条数据

WBOY
WBOYOriginal
2016-06-07 16:28:24909browse

假如有一个数据表A: idnametitleaddtime 如果需要插入n条数据 : $time= time();$data = array( array( 'name'='name1','title'='title1','addtime'=$time; ), array( 'name'='name2','title'='title2','addtime'=$time; ), array( 'name'='name3','title'='t

       假如有一个数据表A:

id name title addtime

        如果需要插入n条数据 :

$time= time();
$data = array(
  array(
   'name'=>'name1','title'=>'title1','addtime'=>$time;
  ),
  array(
   'name'=>'name2','title'=>'title2','addtime'=>$time;
  ),
  array(
   'name'=>'name3','title'=>'title3','addtime'=>$time;
  ),
  ...
  array(
   'name'=>'nameN','title'=>'titleN','addtime'=>$time;
  ),
  
);

   之前我的想法会是,通过数据构造多条插入语句,循环调用 。如:     

$sql1 = "INSERT INTO `A`(`name`,`title`,`addtime`)VALUES ('name1','title1','".$time."')";
$sql2 = "INSERT INTO `A`(`name`,`title`,`addtime`)VALUES ('name2','title2','".$time."')";
......
$sqlN = "INSERT INTO `A`(`name`,`title`,`addtime`)VALUES ('nameN','titleN','".$time."')";

   之后发现了sql的insert语句可以一次插入多条:

$sql = "INSERT INTO `A`(`name`,`title`,`addtime`)VALUES ('name1','title1','".$time."'),";
$sql .= "('name2','title2','".$time."'),";
$sql .= "('name3','title3','".$time."'),";
.....
$sql .= "('nameN','titleN','".$time."')";

       通过","号将多个数据分隔开来,就可以能过一条sql操作来解决多个数据的插入,之前试验时,在插入数据条数为30的情况下,一次插入与多次插入同样数据的速度相比,一次插入快了近9倍。同时,因为插入操作只有一次,所以也类似事务操作,插入失败则全失败,插入成功则全成功,使数据的管理更加方便。所以,如果有多条数据需要插入同一个表的,尽量用这种方式。

以前插入多条数据库记录时,常这么写:

$b = 14;

for($a=0;$a<100;$a++){

   $sql = " INSERT INTO `roles` (`uid`,`rid`) VALUES (".$a.",".$b.")";

   mysql_query($sql);

}

但这种写法效率低下,需要多次执行sql语句。如果你用过phpmyadmin导入数据,其实你会发现,上面的语句其实可以这么写

   INSERT INTO `roles` (`uid`,`rid`) VALUES
       (534,14),(535,14),(536,14),(537,14),(539,14)

所以原来的代码可以这么改写

 $b = 14;

for($a=0;$a<100;$a++){

  if($a==0)

     $sql = "INSERT INTO `roles` (`uid`,`rid`) VALUES (".$a.",".$b.")";

  else

    $sql. = ",(".$a.",".$b.")";

}

mysql_query($sql);

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