mongodb + Golang及Model设计

Mongodb

安装

略

操作

• 启动后台服务程序

mongod  # 如果是默认的数据路径需要root权限， 可以修改数据存储位置。

• 进入命令行

mongo

>>> show databases  # 列出数据库
>>> use {database_name}     # 切换db指针到某个数据库
>>> show collections    # 展示所有的collections (tables)
>>> db.{collection_name}.find() # 列出所有元素
.pretty()   # 以格式化的json形式展示结果

>>> db.{c_name}.insert({json})  # 插入
>>> db.{c_name}.remove({'title': 'what'})   # 删除指定条件元素

Go 操作Mongodb + 抽象工厂模式设计

import "gopkg.in/mgo.v2"

/** Databaser is An abstract factory interface, if you want to add a new database backend, you must implement all function*/
type Databaser interface {
    iUser
}

func GetDatabaseConncect(db string) (Databaser) {
    if db == "mongodb" { return newMongodb()}
    panic("db is not the validate database backend.")
    return nil
}

// anonymous member, we can directly point the final function, such as AddUser.
type Mongodb struct{
    MongodbUser
}

/** The models definition and corresponding interface. */
type User struct {
    // user'name or oauth2 website username
    Username    string
    // oauth2 authenticated website
    Source      string
}

type iUser interface {
    AddUser(user User) (error)
    DeleteUser(user User) (error)
    SelectUser(pairs map[string]string) ([]User, error)
}

type MongodbUser struct {
    database    string
    collection  string  `collection name`
}

// Mongodb's construction, also construct it's interface implementation struct, i.e. subclass.
func newMongodb() (*Mongodb){
    var mdb = new(Mongodb)
    // construct All databases name and collections name, need to be explicit.
    mdb.MongodbUser.database = "Mongodb";
    mdb.MongodbUser.collection = "Users";   // table name.
    return mdb
}

func (self MongodbUser) AddUser(user User) (error) {
    session, err := mgo.Dial(MONGO_DB_SEVER)
    if err != nil {
        return err
    }
    defer session.Close()
    session.SetSafe(&mgo.Safe{})

    c := session.DB(self.database).C(self.collection)
    err = c.Insert(&user)       // It can insert not only one Object, it acquires "...&interface"
    if err != nil {
        return err
    }
    return nil;
}

func (self MongodbUser) DeleteUser(user User) (error) {
    return nil;
}

func (self MongodbUser) SelectUser(pairs map[string]string) ([]User, error) {
    return nil, nil;
}