初始化
db, err := storm.Open("my.db")
defer db.Close()
对象模型
type User struct {
ID int // primary key
Group string `storm:"index"` // this field will be indexed
Email string `storm:"unique"` // this field will be indexed with a unique constraint
Name string // this field will not be indexed
Age int `storm:"index"`
}
对象模型storm tag整理
可以符合使用, 各个值用 , (逗号) 分割
- storm:"index" 添加索引
- storm:"id" 主键标识
- storm:"increment" 自增字段
- storm:"increment=20" 自增字段, 从20开始自增
- storm:"unique" 不能重复
- storm:"inline" 内联标记嵌套
- storm:"__storm_index_" ???
保存数据
user := User{
ID: 10,
Group: "staff",
Email: "john@provider.com",
Name: "John",
Age: 21,
CreatedAt: time.Now(),
}
err := db.Save(&user)
// err == nil
user.ID++
err = db.Save(&user)
// err == storm.ErrAlreadyExists
修改
// Update multiple fields
err := db.Update(&User{ID: 10, Name: "Jack", Age: 45})
// Update a single field
err := db.UpdateField(&User{ID: 10}, "Age", 0)
删除数据
err := db.DeleteStruct(&user)
表管理操作
- 初始化索引
err := db.Init(&User{}) - 重建索引:
err := db.ReIndex(&User{}) - 删表:
err := db.Drop(&User)或err := db.Drop("User")
简单查询
var user User
err := db.One("Email", "john@provider.com", &user)
// err == nil
err = db.One("Name", "John", &user)
// err == nil
err = db.One("Name", "Jack", &user)
// err == storm.ErrNotFound
// Fetch multiple objects
var users []User
err := db.Find("Group", "staff", &users)
// Fetch all objects
var users []User
err := db.All(&users)
// Fetch all objects sorted by index
var users []User
err := db.AllByIndex("CreatedAt", &users)
// Fetch a range of objects
var users []User
err := db.Range("Age", 10, 21, &users)
// Fetch objects by prefix
var users []User
err := db.Prefix("Name", "Jo", &users)
// Skip, Limit and Reverse
var users []User
err := db.Find("Group", "staff", &users, storm.Skip(10))
err = db.Find("Group", "staff", &users, storm.Limit(10))
err = db.Find("Group", "staff", &users, storm.Reverse())
err = db.Find("Group", "staff", &users, storm.Limit(10), storm.Skip(10), storm.Reverse())
err = db.All(&users, storm.Limit(10), storm.Skip(10), storm.Reverse())
err = db.AllByIndex("CreatedAt", &users, storm.Limit(10), storm.Skip(10), storm.Reverse())
err = db.Range("Age", 10, 21, &users, storm.Limit(10), storm.Skip(10), storm.Reverse())
高级查询
import ( "github.com/asdine/storm/q"
)
...
// Equality q.Eq("Name", John) // Strictly greater than q.Gt("Age", 7) // Lesser than or equal to q.Lte("Age", 77) // Regex with name that starts with the letter D q.Re("Name", "^D") // In the given slice of values q.In("Group", []string{"Staff", "Admin"}) // Comparing fields q.EqF("FieldName", "SecondFieldName") q.LtF("FieldName", "SecondFieldName") q.GtF("FieldName", "SecondFieldName") q.LteF("FieldName", "SecondFieldName") q.GteF("FieldName", "SecondFieldName") // Match if all match q.And( q.Gt("Age", 7), q.Re("Name", "^D") ) // Matchers can also be combined with And, Or and Not: // Match if one matches q.Or( q.Re("Name", "^A"), q.Not( q.Re("Name", "^B") ), q.Re("Name", "^C"), q.In("Group", []string{"Staff", "Admin"}), q.And( q.StrictEq("Password", []byte(password)), q.Eq("Registered", true) ) ) query := db.Select(q.Gte("Age", 7), q.Lte("Age", 77)) // Calls can also be chained query = query.Limit(10).Skip(20).OrderBy("Age").Reverse() // But also to specify how to fetch them. var users []User err = query.Find(&users) var user User err = query.First(&user) // demo // Examples with Select: / Find all users with an ID between 10 and 100 err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Find(&users) // Nested matchers err = db.Select(q.Or( q.Gt("ID", 50), q.Lt("Age", 21), q.And( q.Eq("Group", "admin"), q.Gte("Age", 21), ), )).Find(&users) query := db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name") // Find multiple records err = query.Find(&users) // or err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name").Find(&users) // Find first record err = query.First(&user) // or err = db.Select(q.Gte("ID", 10), q.Lte("ID", 100)).Limit(10).Skip(5).Reverse().OrderBy("Age", "Name").First(&user) // Delete all matching records err = query.Delete(new(User)) // Fetching records one by one (useful when the bucket contains a lot of records) query = db.Select(q.Gte("ID", 10),q.Lte("ID", 100)).OrderBy("Age", "Name") err = query.Each(new(User), func(record interface{}) error) { u := record.(*User) ... return nil }
事务
tx, err := db.Begin(true)
if err != nil {
return err
}
defer tx.Rollback()
accountA.Amount -= 100
accountB.Amount += 100
err = tx.Save(accountA)
if err != nil {
return err
}
err = tx.Save(accountB)
if err != nil {
return err
}
return tx.Commit()
不同的数据编码方式
import (
"github.com/asdine/storm/v3"
"github.com/asdine/storm/v3/codec/gob"
"github.com/asdine/storm/v3/codec/json"
"github.com/asdine/storm/v3/codec/sereal"
"github.com/asdine/storm/v3/codec/protobuf"
"github.com/asdine/storm/v3/codec/msgpack"
)
var gobDb, _ = storm.Open("gob.db", storm.Codec(gob.Codec))
var jsonDb, _ = storm.Open("json.db", storm.Codec(json.Codec))
var serealDb, _ = storm.Open("sereal.db", storm.Codec(sereal.Codec))
var protobufDb, _ = storm.Open("protobuf.db", storm.Codec(protobuf.Codec))
var msgpackDb, _ = storm.Open("msgpack.db", storm.Codec(msgpack.Codec))