135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
// Copyright 2019 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package schemas
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import (
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"errors"
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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const (
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TWOSIDES = iota + 1
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ONLYTODB
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ONLYFROMDB
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)
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// Column defines database column
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type Column struct {
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Name string
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TableName string
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FieldName string // Avaiable only when parsed from a struct
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SQLType SQLType
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IsJSON bool
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Length int
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Length2 int
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Nullable bool
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Default string
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Indexes map[string]int
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IsPrimaryKey bool
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IsAutoIncrement bool
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MapType int
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IsCreated bool
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IsUpdated bool
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IsDeleted bool
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IsCascade bool
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IsVersion bool
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DefaultIsEmpty bool // false means column has no default set, but not default value is empty
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EnumOptions map[string]int
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SetOptions map[string]int
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DisableTimeZone bool
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TimeZone *time.Location // column specified time zone
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Comment string
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}
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// NewColumn creates a new column
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func NewColumn(name, fieldName string, sqlType SQLType, len1, len2 int, nullable bool) *Column {
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return &Column{
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Name: name,
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IsJSON: sqlType.IsJson(),
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TableName: "",
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FieldName: fieldName,
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SQLType: sqlType,
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Length: len1,
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Length2: len2,
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Nullable: nullable,
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Default: "",
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Indexes: make(map[string]int),
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IsPrimaryKey: false,
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IsAutoIncrement: false,
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MapType: TWOSIDES,
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IsCreated: false,
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IsUpdated: false,
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IsDeleted: false,
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IsCascade: false,
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IsVersion: false,
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DefaultIsEmpty: true, // default should be no default
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EnumOptions: make(map[string]int),
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Comment: "",
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}
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}
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// ValueOf returns column's filed of struct's value
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func (col *Column) ValueOf(bean interface{}) (*reflect.Value, error) {
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dataStruct := reflect.Indirect(reflect.ValueOf(bean))
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return col.ValueOfV(&dataStruct)
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}
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// ValueOfV returns column's filed of struct's value accept reflevt value
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func (col *Column) ValueOfV(dataStruct *reflect.Value) (*reflect.Value, error) {
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var fieldValue reflect.Value
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fieldPath := strings.Split(col.FieldName, ".")
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if dataStruct.Type().Kind() == reflect.Map {
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keyValue := reflect.ValueOf(fieldPath[len(fieldPath)-1])
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fieldValue = dataStruct.MapIndex(keyValue)
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return &fieldValue, nil
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} else if dataStruct.Type().Kind() == reflect.Interface {
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structValue := reflect.ValueOf(dataStruct.Interface())
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dataStruct = &structValue
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}
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level := len(fieldPath)
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fieldValue = dataStruct.FieldByName(fieldPath[0])
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for i := 0; i < level-1; i++ {
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if !fieldValue.IsValid() {
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break
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}
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if fieldValue.Kind() == reflect.Struct {
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fieldValue = fieldValue.FieldByName(fieldPath[i+1])
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} else if fieldValue.Kind() == reflect.Ptr {
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if fieldValue.IsNil() {
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fieldValue.Set(reflect.New(fieldValue.Type().Elem()))
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}
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fieldValue = fieldValue.Elem().FieldByName(fieldPath[i+1])
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} else {
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return nil, fmt.Errorf("field %v is not valid", col.FieldName)
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}
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}
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if !fieldValue.IsValid() {
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return nil, fmt.Errorf("field %v is not valid", col.FieldName)
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}
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return &fieldValue, nil
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}
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// ConvertID converts id content to suitable type according column type
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func (col *Column) ConvertID(sid string) (interface{}, error) {
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if col.SQLType.IsNumeric() {
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n, err := strconv.ParseInt(sid, 10, 64)
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if err != nil {
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return nil, err
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}
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return n, nil
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} else if col.SQLType.IsText() {
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return sid, nil
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}
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return nil, errors.New("not supported")
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}
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