Php导出百万数据的优化
导出数据量很大的情况下，生成excel的内存需求非常庞大，服务器吃不消，这个时候考虑生成csv来解决问题，cvs读写性能比excel高。
测试表student 数据(大家可以脚本插入300多万测数据。这里只给个简单的示例了)
SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for student -- ---------------------------- DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `StuNo` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `StuName` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL, `StuAge` int(11) NULL DEFAULT NULL, PRIMARY KEY (`ID`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 12 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact; -- ---------------------------- -- Records of student -- ---------------------------- INSERT INTO `student` VALUES (1, 'A001', '小明', 22); INSERT INTO `student` VALUES (2, 'A005', '小李', 23); INSERT INTO `student` VALUES (3, 'A007', '小红', 24); INSERT INTO `student` VALUES (4, 'A003', '小明', 22); INSERT INTO `student` VALUES (5, 'A002', '小李', 23); INSERT INTO `student` VALUES (6, 'A004', '小红', 24); INSERT INTO `student` VALUES (7, 'A006', '小王', 25); INSERT INTO `student` VALUES (8, 'A008', '乔峰', 27); INSERT INTO `student` VALUES (9, 'A009', '欧阳克', 22); INSERT INTO `student` VALUES (10, 'A010', '老顽童', 34); INSERT INTO `student` VALUES (11, 'A011', '黄老邪', 33); SET FOREIGN_KEY_CHECKS = 1;
导出脚本export.php
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
<?phpset_time_limit(0);ini_set('memory_limit', '128M');$fileName = date('YmdHis', time());header('Content-Encoding: UTF-8');header("Content-type:application/vnd.ms-excel;charset=UTF-8");header('Content-Disposition: attachment;filename="' . $fileName . '.csv"');//注意，数据量在大的情况下。比如导出几十万到几百万，会出现504 Gateway Time-out,请修改php.ini的max_execution_time参数//打开php标准输出流以写入追加的方式打开$fp = fopen('php://output', 'a');//连接数据库$dbhost = '127.0.0.1';$dbuser = 'root';$dbpwd = 'root';$con = mysqli_connect($dbhost, $dbuser, $dbpwd);if (mysqli_connect_errno()) die('connect error');$database = 'test';//选择数据库mysqli_select_db($con, $database);mysqli_query($con, "set names UTF8");//如果需要请设置编码//用fputcsv从数据库中导出1百万的数据,比如我们每次取1万条数据，分100步来执行//一次性读取1万条数据，也可以把$nums调小，$step相应增大。$step = 100;$nums = 10000;$where = "where 1=1"; //筛选条件,可自行添加//设置标题$title = array('id', '编号', '姓名', '年龄'); //注意这里是小写id,否则ID命名打开会提示Excel 已经检测到"xxx.xsl"是SYLK文件,但是不能将其加载: CSV 文或者XLS文件的前两个字符是大写字母"I"，"D"时，会发生此问题。foreach ($title as $key => $item) $title[$key] = iconv("UTF-8", "GB2312//IGNORE", $item);fputcsv($fp, $title);for ($s = 1; $s <= $step; $s++) { $start = ($s - 1) * $nums; $result = mysqli_query($con, "SELECT ID,StuNo,StuName,StuAge FROM `student` " . $where . " ORDER BY `ID` LIMIT {$start},{$nums}"); if ($result) { while ($row = mysqli_fetch_assoc($result)) { foreach ($row as $key => $item) $row[$key] = iconv("UTF-8", "GBK", $item); //这里必须转码，不然会乱码 fputcsv($fp, $row); } mysqli_free_result($result); //释放结果集资源 ob_flush(); //每1万条数据就刷新缓冲区 flush(); }}mysqli_close($con);//断开连接 |
导出效果：
无论从事什么行业，只要做好两件事就够了，一个是你的专业、一个是你的人品，专业决定了你的存在，人品决定了你的人脉，剩下的就是坚持，用善良專業和真诚赢取更多的信任。
