| private aggregation ( string $field, boolean | string $isMulti = false, string $operation = '$max', boolean | string $useMaster = false ) : mixed | ||
| $field | string | 要统计的字段名 |
| $isMulti | boolean | string | 结果集是否为多条 默认只有一条。传字符串时此参数为要$group的字段 |
| $operation | string | 聚合操作 |
| $useMaster | boolean | string | 是否使用主库 默认读取从库 |
| return | mixed | |
private function aggregation($field, $isMulti = false, $operation = '$max', $useMaster = false)
{
$pipe = [];
empty($this->sql['where']) || ($pipe[] = ['$match' => $this->sql['where']]);
$pipe[] = ['$group' => ['_id' => $isMulti ? '$' . $isMulti : '0', 'count' => [$operation => '$' . $field]]];
$res = $this->mongoDbAggregate($pipe, [], $useMaster);
if ($isMulti === false) {
return $res[0]['count'];
} else {
return $res;
}
}