讨论数量:
尽量避免循环查库,如果可以,尽量批量插入/更新,数据量特别大,可以先chunk一下,在批量操作,如果在循环里面用到了一些数据,可以先查询出来(集合),然后在循环内使用集合方法,增加where条件筛选等等。。。。 laravel 集合方法很强大,非常多的实用方法
$data = Good::where(条件)->get();
foreach($res as $item) {
$current = $data->where('id',$item->goods_id)->first();
// 处理相关逻辑
}
这样相当于只查询了一次数据库
批量插入,DB::insert(); 批量更新,updateBatch()
//批量更新
public function updateBatch($multipleData = [])
{
try {
if (empty($multipleData)) {
throw new \Exception("数据不能为空");
}
$tableName = DB::getTablePrefix() . $this->getTable(); // 表名
$firstRow = current($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;
}
}
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