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// Copyright 2017 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package statements
import (
"database/sql"
"database/sql/driver"
"fmt"
"reflect"
"time"
"xorm.io/xorm/convert"
"xorm.io/xorm/dialects"
"xorm.io/xorm/internal/json"
"xorm.io/xorm/schemas"
)
var (
nullFloatType = reflect.TypeOf(sql.NullFloat64{})
)
// Value2Interface convert a field value of a struct to interface for puting into database
func (statement *Statement) Value2Interface(col *schemas.Column, fieldValue reflect.Value) (interface{}, error) {
if fieldValue.CanAddr() {
if fieldConvert, ok := fieldValue.Addr().Interface().(convert.Conversion); ok {
data, err := fieldConvert.ToDB()
if err != nil {
return nil, err
}
if col.SQLType.IsBlob() {
return data, nil
}
return string(data), nil
}
}
isNil := fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil()
if !isNil {
if fieldConvert, ok := fieldValue.Interface().(convert.Conversion); ok {
data, err := fieldConvert.ToDB()
if err != nil {
return nil, err
}
if col.SQLType.IsBlob() {
return data, nil
}
if nil == data {
return nil, nil
}
return string(data), nil
}
}
fieldType := fieldValue.Type()
k := fieldType.Kind()
if k == reflect.Ptr {
if fieldValue.IsNil() {
return nil, nil
} else if !fieldValue.IsValid() {
return nil, nil
} else {
// !nashtsai! deference pointer type to instance type
fieldValue = fieldValue.Elem()
fieldType = fieldValue.Type()
k = fieldType.Kind()
}
}
switch k {
case reflect.Bool:
return fieldValue.Bool(), nil
case reflect.String:
return fieldValue.String(), nil
case reflect.Struct:
if fieldType.ConvertibleTo(schemas.TimeType) {
t := fieldValue.Convert(schemas.TimeType).Interface().(time.Time)
tf := dialects.FormatColumnTime(statement.dialect, statement.defaultTimeZone, col, t)
return tf, nil
} else if fieldType.ConvertibleTo(nullFloatType) {
t := fieldValue.Convert(nullFloatType).Interface().(sql.NullFloat64)
if !t.Valid {
return nil, nil
}
return t.Float64, nil
}
if !col.IsJSON {
// !<winxxp>! 增加支持driver.Valuer接口的结构,如sql.NullString
if v, ok := fieldValue.Interface().(driver.Valuer); ok {
return v.Value()
}
fieldTable, err := statement.tagParser.ParseWithCache(fieldValue)
if err != nil {
return nil, err
}
if len(fieldTable.PrimaryKeys) == 1 {
pkField := reflect.Indirect(fieldValue).FieldByName(fieldTable.PKColumns()[0].FieldName)
return pkField.Interface(), nil
}
return nil, fmt.Errorf("no primary key for col %v", col.Name)
}
if col.SQLType.IsText() {
bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
if err != nil {
return nil, err
}
return string(bytes), nil
} else if col.SQLType.IsBlob() {
bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
if err != nil {
return nil, err
}
return bytes, nil
}
return nil, fmt.Errorf("Unsupported type %v", fieldValue.Type())
case reflect.Complex64, reflect.Complex128:
bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
if err != nil {
return nil, err
}
return string(bytes), nil
case reflect.Array, reflect.Slice, reflect.Map:
if !fieldValue.IsValid() {
return fieldValue.Interface(), nil
}
if col.SQLType.IsText() {
bytes, err := json.DefaultJSONHandler.Marshal(fieldValue.Interface())
if err != nil {
return nil, err
}
return string(bytes), nil
} else if col.SQLType.IsBlob() {
var bytes []byte
var err error
if (k == reflect.Slice) &&
(fieldValue.Type().Elem().Kind() == reflect.Uint8) {
bytes = fieldValue.Bytes()
} else {
bytes, err = json.DefaultJSONHandler.Marshal(fieldValue.Interface())
if err != nil {
return nil, err
}
}
return bytes, nil
}
return nil, ErrUnSupportedType
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
return fieldValue.Uint(), nil
default:
return fieldValue.Interface(), nil
}
}