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Beego/orm/orm.go
2013-11-24 14:26:32 +08:00

369 lines
8.1 KiB
Go

package orm
import (
"database/sql"
"errors"
"fmt"
"os"
"reflect"
"time"
)
const (
Debug_Queries = iota
)
var (
// DebugLevel = Debug_Queries
Debug = false
DebugLog = NewLog(os.Stderr)
DefaultRowsLimit = 1000
DefaultRelsDepth = 2
DefaultTimeLoc = time.Local
ErrTxHasBegan = errors.New("<Ormer.Begin> transaction already begin")
ErrTxDone = errors.New("<Ormer.Commit/Rollback> transaction not begin")
ErrMultiRows = errors.New("<QuerySeter> return multi rows")
ErrNoRows = errors.New("<QuerySeter> no row found")
ErrStmtClosed = errors.New("<QuerySeter> stmt already closed")
ErrNotImplement = errors.New("have not implement")
)
type Params map[string]interface{}
type ParamsList []interface{}
type orm struct {
alias *alias
db dbQuerier
isTx bool
}
var _ Ormer = new(orm)
func (o *orm) getMiInd(md interface{}) (mi *modelInfo, ind reflect.Value) {
val := reflect.ValueOf(md)
ind = reflect.Indirect(val)
typ := ind.Type()
if val.Kind() != reflect.Ptr {
panic(fmt.Errorf("<Ormer> cannot use non-ptr model struct `%s`", getFullName(typ)))
}
name := getFullName(typ)
if mi, ok := modelCache.getByFN(name); ok {
return mi, ind
}
panic(fmt.Errorf("<Ormer> table: `%s` not found, maybe not RegisterModel", name))
}
func (o *orm) getFieldInfo(mi *modelInfo, name string) *fieldInfo {
fi, ok := mi.fields.GetByAny(name)
if !ok {
panic(fmt.Errorf("<Ormer> cannot find field `%s` for model `%s`", name, mi.fullName))
}
return fi
}
func (o *orm) Read(md interface{}, cols ...string) error {
mi, ind := o.getMiInd(md)
err := o.alias.DbBaser.Read(o.db, mi, ind, o.alias.TZ, cols)
if err != nil {
return err
}
return nil
}
func (o *orm) Insert(md interface{}) (int64, error) {
mi, ind := o.getMiInd(md)
id, err := o.alias.DbBaser.Insert(o.db, mi, ind, o.alias.TZ)
if err != nil {
return id, err
}
if id > 0 {
if mi.fields.pk.auto {
if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
ind.Field(mi.fields.pk.fieldIndex).SetUint(uint64(id))
} else {
ind.Field(mi.fields.pk.fieldIndex).SetInt(id)
}
}
}
return id, nil
}
func (o *orm) Update(md interface{}, cols ...string) (int64, error) {
mi, ind := o.getMiInd(md)
num, err := o.alias.DbBaser.Update(o.db, mi, ind, o.alias.TZ, cols)
if err != nil {
return num, err
}
return num, nil
}
func (o *orm) Delete(md interface{}) (int64, error) {
mi, ind := o.getMiInd(md)
num, err := o.alias.DbBaser.Delete(o.db, mi, ind, o.alias.TZ)
if err != nil {
return num, err
}
if num > 0 {
if mi.fields.pk.auto {
if mi.fields.pk.fieldType&IsPostiveIntegerField > 0 {
ind.Field(mi.fields.pk.fieldIndex).SetUint(0)
} else {
ind.Field(mi.fields.pk.fieldIndex).SetInt(0)
}
}
}
return num, nil
}
func (o *orm) QueryM2M(md interface{}, name string) QueryM2Mer {
mi, ind := o.getMiInd(md)
fi := o.getFieldInfo(mi, name)
switch {
case fi.fieldType == RelManyToMany:
case fi.fieldType == RelReverseMany && fi.reverseFieldInfo.mi.isThrough:
default:
panic(fmt.Errorf("<Ormer.QueryM2M> model `%s` . name `%s` is not a m2m field", fi.name, mi.fullName))
}
return newQueryM2M(md, o, mi, fi, ind)
}
func (o *orm) LoadRelated(md interface{}, name string, args ...interface{}) (int64, error) {
_, fi, ind, qseter := o.queryRelated(md, name)
qs := qseter.(*querySet)
var relDepth int
var limit, offset int64
var order string
for i, arg := range args {
switch i {
case 0:
if v, ok := arg.(bool); ok {
if v {
relDepth = DefaultRelsDepth
}
} else if v, ok := arg.(int); ok {
relDepth = v
}
case 1:
limit = ToInt64(arg)
case 2:
offset = ToInt64(arg)
case 3:
order, _ = arg.(string)
}
}
switch fi.fieldType {
case RelOneToOne, RelForeignKey, RelReverseOne:
limit = 1
offset = 0
}
qs.limit = limit
qs.offset = offset
qs.relDepth = relDepth
if len(order) > 0 {
qs.orders = []string{order}
}
find := ind.Field(fi.fieldIndex)
var nums int64
var err error
switch fi.fieldType {
case RelOneToOne, RelForeignKey, RelReverseOne:
val := reflect.New(find.Type().Elem())
container := val.Interface()
err = qs.One(container)
if err == nil {
find.Set(val)
nums = 1
}
default:
nums, err = qs.All(find.Addr().Interface())
}
return nums, err
}
func (o *orm) QueryRelated(md interface{}, name string) QuerySeter {
// is this api needed ?
_, _, _, qs := o.queryRelated(md, name)
return qs
}
func (o *orm) queryRelated(md interface{}, name string) (*modelInfo, *fieldInfo, reflect.Value, QuerySeter) {
mi, ind := o.getMiInd(md)
fi := o.getFieldInfo(mi, name)
_, _, exist := getExistPk(mi, ind)
if exist == false {
panic(ErrMissPK)
}
var qs *querySet
switch fi.fieldType {
case RelOneToOne, RelForeignKey, RelManyToMany:
if !fi.inModel {
break
}
qs = o.getRelQs(md, mi, fi)
case RelReverseOne, RelReverseMany:
if !fi.inModel {
break
}
qs = o.getReverseQs(md, mi, fi)
}
if qs == nil {
panic(fmt.Errorf("<Ormer> name `%s` for model `%s` is not an available rel/reverse field"))
}
return mi, fi, ind, qs
}
func (o *orm) getReverseQs(md interface{}, mi *modelInfo, fi *fieldInfo) *querySet {
switch fi.fieldType {
case RelReverseOne, RelReverseMany:
default:
panic(fmt.Errorf("<Ormer> name `%s` for model `%s` is not an available reverse field", fi.name, mi.fullName))
}
var q *querySet
if fi.fieldType == RelReverseMany && fi.reverseFieldInfo.mi.isThrough {
q = newQuerySet(o, fi.relModelInfo).(*querySet)
q.cond = NewCondition().And(fi.reverseFieldInfoM2M.column+ExprSep+fi.reverseFieldInfo.column, md)
} else {
q = newQuerySet(o, fi.reverseFieldInfo.mi).(*querySet)
q.cond = NewCondition().And(fi.reverseFieldInfo.column, md)
}
return q
}
func (o *orm) getRelQs(md interface{}, mi *modelInfo, fi *fieldInfo) *querySet {
switch fi.fieldType {
case RelOneToOne, RelForeignKey, RelManyToMany:
default:
panic(fmt.Errorf("<Ormer> name `%s` for model `%s` is not an available rel field", fi.name, mi.fullName))
}
q := newQuerySet(o, fi.relModelInfo).(*querySet)
q.cond = NewCondition()
if fi.fieldType == RelManyToMany {
q.cond = q.cond.And(fi.reverseFieldInfoM2M.column+ExprSep+fi.reverseFieldInfo.column, md)
} else {
q.cond = q.cond.And(fi.reverseFieldInfo.column, md)
}
return q
}
func (o *orm) QueryTable(ptrStructOrTableName interface{}) (qs QuerySeter) {
name := ""
if table, ok := ptrStructOrTableName.(string); ok {
name = snakeString(table)
if mi, ok := modelCache.get(name); ok {
qs = newQuerySet(o, mi)
}
} else {
name = getFullName(indirectType(reflect.TypeOf(ptrStructOrTableName)))
if mi, ok := modelCache.getByFN(name); ok {
qs = newQuerySet(o, mi)
}
}
if qs == nil {
panic(fmt.Errorf("<Ormer.QueryTable> table name: `%s` not exists", name))
}
return
}
func (o *orm) Using(name string) error {
if o.isTx {
panic(fmt.Errorf("<Ormer.Using> transaction has been start, cannot change db"))
}
if al, ok := dataBaseCache.get(name); ok {
o.alias = al
if Debug {
o.db = newDbQueryLog(al, al.DB)
} else {
o.db = al.DB
}
} else {
return fmt.Errorf("<Ormer.Using> unknown db alias name `%s`", name)
}
return nil
}
func (o *orm) Begin() error {
if o.isTx {
return ErrTxHasBegan
}
var tx *sql.Tx
tx, err := o.db.(txer).Begin()
if err != nil {
return err
}
o.isTx = true
if Debug {
o.db.(*dbQueryLog).SetDB(tx)
} else {
o.db = tx
}
return nil
}
func (o *orm) Commit() error {
if o.isTx == false {
return ErrTxDone
}
err := o.db.(txEnder).Commit()
if err == nil {
o.isTx = false
o.Using(o.alias.Name)
} else if err == sql.ErrTxDone {
return ErrTxDone
}
return err
}
func (o *orm) Rollback() error {
if o.isTx == false {
return ErrTxDone
}
err := o.db.(txEnder).Rollback()
if err == nil {
o.isTx = false
o.Using(o.alias.Name)
} else if err == sql.ErrTxDone {
return ErrTxDone
}
return err
}
func (o *orm) Raw(query string, args ...interface{}) RawSeter {
return newRawSet(o, query, args)
}
func (o *orm) Driver() Driver {
return driver(o.alias.Name)
}
func NewOrm() Ormer {
BootStrap() // execute only once
o := new(orm)
err := o.Using("default")
if err != nil {
panic(err)
}
return o
}