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Jamers

MongoDB使用过程中的记录

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$where 使用示例:

db.test.find({
	"detail.test": {$nin:[null],$exists: true},
	$where: function() {
		var ret = false;
		for(var curr in this.detail.test) {
			//print(this.detail.test[curr].nums);
			if (this.detail.test[curr].nums >= 100) {
				ret = true;
				break;
			}
		}
		return ret;
	}
});

以上仅为演示使用$where的方式,上面的功能推荐用子元素匹配处理,上面的效率太低了

db.test.find({
		'detail.test': {
			'$elemMatch': {'nums': {'$gte': 100}}
		},
} 

查看print输出日志需要到服务器上直接查看日志,不推荐打开日志

tail -f /var/db/mongodb/mongod.log

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