mysql 大数据查询分页

mysql 数据量过大, 导致分页查询过慢解决办法

1
2
3
4
DB::select("select a.title,a.name from 
(SELECT `id` FROM `article` WHERE `status` = ? AND `updated_at` > ? LIMIT ? OFFSET ? ) c
LEFT JOIN article a ON a.id = c.id
LEFT JOIN `detail` AS `ab` ON `a`.`id` = `ab`.`article_id` ",[1,'2018-12-01',$limit,$offset]

自定义函数

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
/**
* updateBigDataBySql 用SQL拼接批量更新
*
* @param array $multipleData 更新数据
*
* @return bool|int
*/
public function updateBigDataBySql($multipleData = []){
try {
if (empty($multipleData)) {
throw new \Exception("数据不能为空");
}
$tableName = $this->model->getTable();
$firstRow = current($multipleData);

$updateColumn = array_keys($firstRow);
// 默认以id为条件更新,如果没有ID则以第一个字段为条件
$referenceColumn = isset($firstRow['id']) ? 'id' : current($updateColumn);
unset($updateColumn[0]);
// 拼接sql语句
$updateSql = "UPDATE " . $tableName . " SET ";
$sets = [];
$bindings = [];
foreach ($updateColumn as $uColumn) {
$setSql = "`" . $uColumn . "` = CASE ";
foreach ($multipleData as $data) {
$setSql .= "WHEN `" . $referenceColumn . "` = ? THEN ? ";
$bindings[] = $data[$referenceColumn];
$bindings[] = $data[$uColumn];
}
$setSql .= "ELSE `" . $uColumn . "` END ";
$sets[] = $setSql;
}

$updateSql .= implode(', ', $sets);
$whereIn = collect($multipleData)->pluck($referenceColumn)->values()->all();
$bindings = array_merge($bindings, $whereIn);
$whereIn = rtrim(str_repeat('?,', count($whereIn)), ',');
$updateSql = rtrim($updateSql, ", ") . " WHERE `" . $referenceColumn . "` IN (" . $whereIn . ")";
// 传入预处理sql语句和对应绑定数据
return DB::update($updateSql, $bindings);
} catch (\Exception $e) {
return false;
}
}
你是本站第位访客 本站访客数人次
Fork me on GitHub