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Beego/orm/db_utils.go

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// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package orm
import (
"fmt"
"reflect"
"time"
)
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// 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))
}
}
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// get pk column info.
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func getExistPk(mi *modelInfo, ind reflect.Value) (column string, value interface{}, exist bool) {
fi := mi.fields.pk
v := ind.Field(fi.fieldIndex)
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if fi.fieldType&IsPostiveIntegerField > 0 {
vu := v.Uint()
exist = vu > 0
value = vu
} else if fi.fieldType&IsIntegerField > 0 {
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vu := v.Int()
exist = vu > 0
value = vu
} else {
vu := v.String()
exist = vu != ""
value = vu
}
column = fi.column
return
}
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// get fields description as flatted string.
func getFlatParams(fi *fieldInfo, args []interface{}, tz *time.Location) (params []interface{}) {
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outFor:
for _, arg := range args {
val := reflect.ValueOf(arg)
if arg == nil {
params = append(params, arg)
continue
}
kind := val.Kind()
if kind == reflect.Ptr {
val = val.Elem()
kind = val.Kind()
arg = val.Interface()
}
switch kind {
case reflect.String:
v := val.String()
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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]
}
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t, err = time.ParseInLocation(format_Date, s, tz)
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}
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 reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
arg = val.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
arg = val.Uint()
case reflect.Float32:
arg, _ = StrTo(ToStr(arg)).Float64()
case reflect.Float64:
arg = val.Float()
case reflect.Bool:
arg = val.Bool()
case reflect.Slice, reflect.Array:
if _, ok := arg.([]byte); ok {
continue outFor
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}
var args []interface{}
for i := 0; i < val.Len(); i++ {
v := val.Index(i)
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var vu interface{}
if v.CanInterface() {
vu = v.Interface()
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}
if vu == nil {
continue
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}
args = append(args, vu)
}
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if len(args) > 0 {
p := getFlatParams(fi, args, tz)
params = append(params, p...)
}
continue outFor
case reflect.Struct:
if v, ok := arg.(time.Time); ok {
if fi != nil && fi.fieldType == TypeDateField {
arg = v.In(tz).Format(format_Date)
} else {
arg = v.In(tz).Format(format_DateTime)
}
} else {
typ := val.Type()
name := getFullName(typ)
var value interface{}
if mmi, ok := modelCache.getByFN(name); ok {
if _, vu, exist := getExistPk(mmi, val); exist {
value = vu
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}
}
arg = value
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if arg == nil {
panic(fmt.Errorf("need a valid args value, unknown table or value `%s`", name))
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}
}
}
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params = append(params, arg)
}
return
}