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Beego/orm/db_utils.go
2014-01-17 17:25:17 +08:00

140 lines
2.7 KiB
Go

package orm
import (
"fmt"
"reflect"
"time"
)
// get table alias.
func getDbAlias(name string) *alias {
if al, ok := dataBaseCache.get(name); ok {
return al
} else {
panic(fmt.Errorf("unknown DataBase alias name %s", name))
}
return nil
}
// get pk column info.
func getExistPk(mi *modelInfo, ind reflect.Value) (column string, value interface{}, exist bool) {
fi := mi.fields.pk
v := ind.Field(fi.fieldIndex)
if fi.fieldType&IsPostiveIntegerField > 0 {
vu := v.Uint()
exist = vu > 0
value = vu
} else if fi.fieldType&IsIntegerField > 0 {
vu := v.Int()
exist = vu > 0
value = vu
} else {
vu := v.String()
exist = vu != ""
value = vu
}
column = fi.column
return
}
// get fields description as flatted string.
func getFlatParams(fi *fieldInfo, args []interface{}, tz *time.Location) (params []interface{}) {
outFor:
for _, arg := range args {
val := reflect.ValueOf(arg)
if arg == nil {
params = append(params, arg)
continue
}
switch v := arg.(type) {
case []byte:
case string:
if fi != nil {
if fi.fieldType == TypeDateField || fi.fieldType == TypeDateTimeField {
var t time.Time
var err error
if len(v) >= 19 {
s := v[:19]
t, err = time.ParseInLocation(format_DateTime, s, DefaultTimeLoc)
} else {
s := v
if len(v) > 10 {
s = v[:10]
}
t, err = time.ParseInLocation(format_Date, s, tz)
}
if err == nil {
if fi.fieldType == TypeDateField {
v = t.In(tz).Format(format_Date)
} else {
v = t.In(tz).Format(format_DateTime)
}
}
}
}
arg = v
case time.Time:
if fi != nil && fi.fieldType == TypeDateField {
arg = v.In(tz).Format(format_Date)
} else {
arg = v.In(tz).Format(format_DateTime)
}
default:
kind := val.Kind()
switch kind {
case reflect.Slice, reflect.Array:
var args []interface{}
for i := 0; i < val.Len(); i++ {
v := val.Index(i)
var vu interface{}
if v.CanInterface() {
vu = v.Interface()
}
if vu == nil {
continue
}
args = append(args, vu)
}
if len(args) > 0 {
p := getFlatParams(fi, args, tz)
params = append(params, p...)
}
continue outFor
case reflect.Ptr, reflect.Struct:
ind := reflect.Indirect(val)
if ind.Kind() == reflect.Struct {
typ := ind.Type()
name := getFullName(typ)
var value interface{}
if mmi, ok := modelCache.getByFN(name); ok {
if _, vu, exist := getExistPk(mmi, ind); exist {
value = vu
}
}
arg = value
if arg == nil {
panic(fmt.Errorf("need a valid args value, unknown table or value `%s`", name))
}
} else {
arg = ind.Interface()
}
}
}
params = append(params, arg)
}
return
}