golang-mongodb范例

 package main
 
 import (
     "log"
 
     "gopkg.in/mgo.v2"
     "gopkg.in/mgo.v2/bson"
 )
 
 type Address struct {
     Address string
 }
 type Location struct {
     Longitude float64
     Latitude  float64
 }
 
 type Person struct {
     Id       bson.ObjectId `bson:"_id"`
     Name     string
     Age_Int  int
     Address  []Address
     Location Location
 }
 
 func main() {
     log.SetFlags(log.Flags() | log.Lshortfile)
     //连接
     session, err := mgo.Dial("127.0.0.1:27017")
     if err != nil {
         log.Println(err)
         return
     }
     //设置模式
     session.SetMode(mgo.Monotonic, true)
     //获取文档集
     collection := session.DB("test").C("person")
     // 创建索引
     index := mgo.Index{
         Key:        []string{"name"}, // 索引字段， 默认升序,若需降序在字段前加-
         Unique:     true,             // 唯一索引 同mysql唯一索引
         DropDups:   true,             // 索引重复替换旧文档,Unique为true时失效
         Background: true,             // 后台创建索引
     }
     if err := collection.EnsureIndex(index); err != nil {
         log.Println(err)
         return
     }
     if err := collection.EnsureIndexKey("$2dsphere:location"); err != nil { // 创建一个范围索引
         log.Println(err)
         return
     }
     //添加记录
     person := Person{
         Id:      bson.NewObjectId(),
         Name:    "逍遥",
         Age_Int: ,
         Address: []Address{
             Address{
                 Address: "仙灵岛",
             },
         },
         Location: Location{
            Longitude: ,
             Latitude:  ,
         },
     }
     if err := collection.Insert(person); err != nil {
         log.Println(err)
         return
     }
     //查找记录
     newPerson := &Person{}
     if err := collection.Find(bson.M{"age_int": }).One(newPerson); err != nil {
         log.Println(err)
         return
     }
     //修改记录
     if err := collection.Update(bson.M{"age_int": }, bson.M{"$set": bson.M{"age_int": }}); err != nil {
         log.Println(err)
         return
     }
     //删除记录
     //if err := collection.Remove(bson.M{"age_int": 26}); err != nil {
     //  log.Println(err)
     //  return
     //}
     //位置搜索
     selector := bson.M{
         "location": bson.M{
             "$near": bson.M{
                 "$geometry": bson.M{
                     "type":        "Point",
                     "coordinates": []float64{, },
                 },
                 "$maxDistance": ,
                 //"$minDistance": 0,
             },
         },
     }
     if err := collection.Find(selector).One(newPerson); err != nil {
         log.Println(err)
         return
     }
     //
     session.Close()
 }