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| package models
import (
"log"
"os"
"fmt"
"github.com/pkg/errors"
"github.com/go-xorm/xorm"
_ "github.com/mattn/go-sqlite3"
)
type Account struct {
Id int64
Name string `xorm:"unique"`
Balance float64
Version int `xorm:"version"`
}
func (a *Account) BeforeInsert() {
log.Printf("before insert: %s\n", a.Name)
}
func (a *Account) AfterInsert() {
log.Printf("afer insert: %s\n", a.Name)
}
var x *xorm.Engine
func init() {
var err error
x, err = xorm.NewEngine("sqlite3", "./bank.db")
if err != nil {
log.Fatalf("Fail to create engine: %v", err)
}
if err = x.Sync(new(Account)); err != nil {
log.Fatalf("Fail to sync database: %v", err)
}
init_log()
cacher := xorm.NewLRUCacher(xorm.NewMemoryStore(), 1000)
x.SetDefaultCacher(cacher)
}
func init_log() {
x.ShowSQL(true)
f, err := os.Create("sql.log")
if err != nil {
log.Fatalf("Fail to create log file: %v\n", err)
return
}
x.SetLogger(xorm.NewSimpleLogger(f))
}
func NewAccount(name string, balance float64) error {
_, err := x.Insert(&Account{Name: name, Balance: balance})
return err
}
func GetAccount(Id int64) (*Account, error) {
a := &Account{}
has, err := x.Id(Id).Get(a)
if err != nil {
return nil, err
} else if !has {
return nil, errors.New("Account not found")
}
return a, nil
}
func MakeDeposit(Id int64, deposit float64) (*Account, error) {
a, err := GetAccount(Id)
if err != nil {
return nil, err
}
a.Balance += deposit
_, err = x.Update(a)
return a, err
}
func MakeWithdraw(Id int64, withdraw float64) (*Account, error) {
a, err := GetAccount(Id)
if err != nil {
return nil, err
}
if a.Balance <= withdraw {
return nil, errors.New("Not enough balance")
}
a.Balance -= withdraw
_, err = x.Update(a)
return a, err
}
func MakeTransfer(Id1 int64, transfer float64, Id2 int64) error {
a1, err := GetAccount(Id1)
if err != nil {
return err
}
a2, err := GetAccount(Id2)
if err != nil {
return err
}
if a1.Balance <= transfer {
return errors.New("Not enough balance")
}
a1.Balance -= transfer
a2.Balance += transfer
s := x.NewSession()
defer s.Close()
if err = s.Begin(); err != nil {
return err
}
if _, err = s.Update(a1); err != nil {
s.Rollback()
return err
}
if _, err = s.Update(a2); err != nil {
s.Rollback()
return err
}
return s.Commit()
}
func GetAccountsSortedById() (as []*Account, err error) {
err = x.Asc("id").Find(&as)
return as, err
}
func GetAccountsSortedByNameDesc() (as []*Account, err error) {
err = x.Desc("name").Find(&as)
return as, err
}
func DeleteAccount(id int64) error {
_, err := x.Delete(&Account{Id: id})
return err
}
func GetAccountCount() (int64, error) {
return x.Count(new(Account))
}
func PrintAccounts() error {
err := x.Iterate(new(Account), func(idx int, bean interface{}) error {
fmt.Printf("%d: %#v\n", idx, bean.(*Account))
return nil
})
return err
}
func PrintAccounts2() error {
rows, err := x.Rows(new(Account))
if err != nil {
return err
}
defer rows.Close()
a := new(Account)
for rows.Next() {
if err = rows.Scan(a); err != nil {
return err
} else {
fmt.Printf("%#v\n", a)
}
}
return nil
}
|
