mgo中DBRef-数据查询测试
下午对数据查询进行了代码测试:
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package
main import
( "crypto/rand" "encoding/hex" "fmt" "labix.org/v2/mgo" "labix.org/v2/mgo/bson" "time" ) var ( mgoSession *mgo.Session databaseName = "myDB" tbl_person = "persons" tbl_log = "logs" ) type Person struct { Id string Name string Inserted time.Time } type Log struct { LogId string Log string LogUser mgo.DBRef Inserted time.Time } func main() { session, err := mgo.Dial( "localhost:27017" ) if
err != nil { panic(err) } defer session.Close() session.SetMode(mgo.Monotonic, true ) session.DB(databaseName).DropDatabase() c := session.DB(databaseName).C(tbl_person) d := session.DB(databaseName).C(tbl_log) _ = c.Insert(&Person{ "111" , "ssl1" , time.Now()}) _ = c.Insert(&Person{ "222" , "ssl1" , time.Now()}) _ = c.Insert(&Person{ "333" , "ssl1" , time.Now()}) for
i := 0 ; i < 10 ; i++ { _ = d.Insert(&Log{GenerateUUID(), "这是一个测试日志" , mgo.DBRef{tbl_person, "111" , databaseName}, time.Now()}) } for
i := 0 ; i < 10 ; i++ { _ = d.Insert(&Log{GenerateUUID(), "这是一个测试日志" , mgo.DBRef{tbl_person, "222" , databaseName}, time.Now()}) } for
i := 0 ; i < 10 ; i++ { _ = d.Insert(&Log{GenerateUUID(), "这是一个测试日志" , mgo.DBRef{tbl_person, "333" , databaseName}, time.Now()}) } personcount, _ := c.Find(bson.M{}).Count() fmt.Println(personcount) logcount, _ := d.Find(bson.M{}).Count() fmt.Println(logcount) //在这里loguser.$db值未用变量,测试了一下数据库名大小敏感问题,结果结果:数据库区分大小写!!!! //如果是在同一个数据库中,loguser.$db可不写 p1logcount, _ := d.Find(bson.M{ "loguser.$ref" : tbl_person, "loguser.$id" : "111" , "loguser.$db" : "myDB" }).Count() fmt.Println(p1logcount) result1 := []Log{} err = d.Find(bson.M{}).All(&result1) fmt.Println(result1) } func GenerateUUID() string { uuid := make([] byte , 16 ) n, err := rand.Read(uuid) if
n != len(uuid) || err != nil { return
"" } uuid[ 8 ] = 0x80
// variant bits see page 5 uuid[ 4 ] = 0x40
// version 4 Pseudo Random, see page 7 return
hex.EncodeToString(uuid) } |
结果正确:
[ `run` | done: 179.164361ms ] 3 30 10
参考:
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