go与数据库交互

go(四)

来谈谈go语言与mongodb的交互

首先，定义几个连接变量

var (
    mgoSession *mgo.Session
    logSession *mgo.Session
    sequenceC  = "sequence"
)

然后定义一些配置变量：

var dbUrl string 
var gameDb string
var userDb string
var logDb string
var logDbUrl string
var dbPoolLimit int

给配置变量绑定数据

flag.StringVar(&dbUrl, "db", "127.0.0.1", "db url.")
    flag.StringVar(&logDbUrl, "logDBUrl", "", "logdb url.")
    flag.StringVar(&gameDb, "gameDB", "poker_game", "gameDB名称")
    flag.StringVar(&userDb, "userDB", "poker_user", "userDB名称")
    flag.StringVar(&logDb, "logDB", "poker_log", "logDB名称")
    flag.IntVar(&dbPoolLimit, "dbPoolLimit", 200, "数据库连接数限制")

然后，得到连接

func getSession() *mgo.Session {
    if mgoSession == nil {
        var err error
        mgoSession, err = mgo.Dial(dbUrl)
        if err != nil {
            panic(err)
        }
        mgoSession.SetPoolLimit(dbPoolLimit)
    }
    return mgoSession.Clone()
}

然后写个操作数据库的方法就可以了

func WithGameCollection(collection string, s func(*mgo.Collection) error) error {
    session := getSession()
    defer session.Close()
    c := session.DB(gameDb).C(collection)
    return s(c)
}