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MongoDB 做日志服务器。

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写日志最常用的方式是写入纯文本文件，然后安日期分割文件，压错旧文件。

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这样的日志与对懂shell,perl语言的人分析起来非常方便，对于程序员来说还是更喜欢写入数据库服务器，然后通过sql语句查询。

对于程序员来说sql语句提供了丰富查询功能，相比文本文件分析更容易。

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下面就是一个简单日志表, 尽量做到通用所以只有message。

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CREATE TABLE `logging` (
	`id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
	`tag` ENUM('unknow','user','bbs','cart','admin') NOT NULL DEFAULT 'unknow' COMMENT '日志标签域',
	`asctime` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '产生时间',
	`facility` ENUM('unknow','account','bank','unionpay','sms','email','register') NOT NULL DEFAULT 'unknow' COMMENT '类别',
	`priority` ENUM('info','warning','error','critical','exception','debug') NOT NULL DEFAULT 'debug' COMMENT '级别',
	`message` VARCHAR(512) NOT NULL COMMENT '内容',
	`operator` VARCHAR(50) NOT NULL DEFAULT 'computer' COMMENT '操作者',
	PRIMARY KEY (`id`)
)
COMMENT='日志表'
COLLATE='utf8_general_ci'
ENGINE=InnoDB;

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mongodb 的message字段比起sql更灵活

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db.logging.user.save({'asctime':'2012-10-10 12:12:12','facility':'register','priority':'info','operator':'computer','message':{'name':'neo','address':{'city':'shenzhen','post':518000},'phone':[13113668890,13322993040]}})
db.logging.user.save({'asctime':'2012-10-10 12:12:12','facility':'sms','priority':'error','operator':'computer','message':'send sms: 13113668890，text: xxxxx'})

db.logging.user.find()

db.logging.admin.save({'asctime':'2012-10-10 12:12:12','facility':'account','priority':'info','operator':'computer','message':'delete account'})
db.logging.admin.save({'asctime':'2012-10-10 12:12:12','facility':'sms','priority':'info','operator':'computer','message':'send sms'})
db.logging.admin.save({'asctime':'2012-10-10 12:12:12','facility':'bank','priority':'warning','operator':'computer','message':'bank from xxxx to xxxx'})

db.logging.admin.find()

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> db.logging.user.find()
{ "_id" : ObjectId("50cc10dd3e4f5a2b92fb5f37"), "asctime" : "2012-10-10 12:12:12", "facility" : "register", "priority" : "info", "operator" : "computer", "message" : { "name" : "neo", "address" : { "city" : "shenzhen", "post" : 518000 }, "phone" : [ 13113668890, 13322993040 ] } }
{ "_id" : ObjectId("50cc11a23e4f5a2b92fb5f39"), "asctime" : "2012-10-10 12:12:12", "facility" : "sms", "priority" : "error", "operator" : "computer", "message" : "send sms: 13113668890" }
> db.logging.admin.find()
{ "_id" : ObjectId("50cc11443e4f5a2b92fb5f38"), "asctime" : "2012-10-10 12:12:12", "facility" : "account", "priority" : "info", "operator" : "computer", "message" : "delete account" }
{ "_id" : ObjectId("50cc120c3e4f5a2b92fb5f3a"), "asctime" : "2012-10-10 12:12:12", "facility" : "bank", "priority" : "warning", "operator" : "computer", "message" : "bank from xxxx to xxxx" }
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