mongodb中聚合函数完成sum的功能。
/**
* select sum(pop) total from zipsController
*/
exports.sumDemoAsync = function (opts) {
var results = {error_code: -1, error_msg: "error"};
var pipeline = [
{
$group: {
_id: null,
total: {$sum: "$pop"}
}
}
];
return opts.dbs.csdb.collection("zipsController").aggregateAsync(pipeline)
.timeout(opts.configs.timeoutnormal)
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