Golang Scope.DB方法代码示例

func beforeQuery(scope *gorm.Scope) {
	if isLocalizable(scope) {
		quotedTableName := scope.QuotedTableName()
		quotedPrimaryKey := scope.Quote(scope.PrimaryKey())

		locale, isLocale := getLocale(scope)
		switch mode, _ := scope.DB().Get("l10n:mode"); mode {
		case "unscoped":
		case "global":
			scope.Search.Where(fmt.Sprintf("%v.language_code = ?", quotedTableName), Global)
		case "locale":
			scope.Search.Where(fmt.Sprintf("%v.language_code = ?", quotedTableName), locale)
		case "reverse":
			if !scope.Search.Unscoped && scope.Fields()["deleted_at"] != nil {
				scope.Search.Where(fmt.Sprintf("(%v NOT IN (SELECT DISTINCT(%v) FROM %v t2 WHERE t2.language_code = ? AND t2.deleted_at IS NULL) AND language_code = ?)", quotedPrimaryKey, quotedPrimaryKey, quotedTableName), locale, Global)
			} else {
				scope.Search.Where(fmt.Sprintf("(%v NOT IN (SELECT DISTINCT(%v) FROM %v t2 WHERE t2.language_code = ?) AND language_code = ?)", quotedPrimaryKey, quotedPrimaryKey, quotedTableName), locale, Global)
			}
		default:
			if isLocale {
				if !scope.Search.Unscoped && scope.Fields()["deleted_at"] != nil {
					scope.Search.Where(fmt.Sprintf("((%v NOT IN (SELECT DISTINCT(%v) FROM %v t2 WHERE t2.language_code = ? AND t2.deleted_at IS NULL) AND language_code = ?) OR language_code = ?) AND deleted_at IS NULL", quotedPrimaryKey, quotedPrimaryKey, quotedTableName), locale, Global, locale)
				} else {
					scope.Search.Where(fmt.Sprintf("(%v NOT IN (SELECT DISTINCT(%v) FROM %v t2 WHERE t2.language_code = ?) AND language_code = ?) OR (language_code = ?)", quotedPrimaryKey, quotedPrimaryKey, quotedTableName), locale, Global, locale)
				}
			} else {
				scope.Search.Where(fmt.Sprintf("%v.language_code = ?", quotedTableName), Global)
			}
		}
	}
}

func syncDeleteFromProductionToDraft(scope *gorm.Scope) {
	if !scope.HasError() {
		if ok, clone := isProductionModeAndNewScope(scope); ok {
			scope.DB().Callback().Delete().Get("gorm:delete")(clone)
		}
	}
}

func validate(scope *gorm.Scope) {
	if _, ok := scope.Get("gorm:update_column"); !ok {
		if result, ok := scope.DB().Get(skipValidations); !(ok && result.(bool)) {
			scope.CallMethodWithErrorCheck("Validate")
		}
	}
}

func reorderPositions(scope *gorm.Scope) {
	if !scope.HasError() {
		if _, ok := scope.Value.(sortingInterface); ok {
			table := scope.TableName()
			var additionalSQL []string
			var additionalValues []interface{}
			// with l10n
			if locale, ok := scope.DB().Get("l10n:locale"); ok && locale.(string) != "" {
				additionalSQL = append(additionalSQL, "language_code = ?")
				additionalValues = append(additionalValues, locale)
			}
			additionalValues = append(additionalValues, additionalValues...)

			// with soft delete
			if scope.HasColumn("DeletedAt") {
				additionalSQL = append(additionalSQL, "deleted_at IS NULL")
			}

			var sql = fmt.Sprintf("UPDATE %v SET position = (SELECT COUNT(pos) + 1 FROM (SELECT DISTINCT(position) AS pos FROM %v WHERE %v) AS t2 WHERE t2.pos < %v.position) WHERE %v", table, table, strings.Join(additionalSQL, " AND "), table, strings.Join(additionalSQL, " AND "))
			if scope.NewDB().Exec(sql, additionalValues...).Error == nil {
				// Create Publish Event
				createPublishEvent(scope.DB(), scope.Value)
			}
		}
	}
}

func getLocale(scope *gorm.Scope) (locale string, ok bool) {
	if str, ok := scope.DB().Get("l10n:locale"); ok {
		if locale, ok := str.(string); ok {
			return locale, (locale != Global) && (locale != "")
		}
	}
	return Global, false
}

func validate(scope *gorm.Scope) {
	db := scope.DB()
	if _, ok := db.Get(settingKey); !ok {
		db.InstantSet(settingKey, map[string][]string{})
	}

	if result, ok := db.Get(skipValidations); !(ok && result.(bool)) {
		scope.CallMethodWithErrorCheck("Validate")
	}
}

func afterUpdate(scope *gorm.Scope) {
	if !scope.HasError() {
		if isLocalizable(scope) {
			if locale, ok := getLocale(scope); ok {
				if scope.DB().RowsAffected == 0 && !scope.PrimaryKeyZero() { //is locale and nothing updated
					var count int
					var query = fmt.Sprintf("%v.language_code = ? AND %v.%v = ?", scope.QuotedTableName(), scope.QuotedTableName(), scope.PrimaryKey())

					// if enabled soft delete, delete soft deleted records
					if scope.HasColumn("DeletedAt") {
						scope.NewDB().Unscoped().Where("deleted_at is not null").Where(query, locale, scope.PrimaryKeyValue()).Delete(scope.Value)
					}

					// if no localized records exist, localize it
					if scope.NewDB().Table(scope.TableName()).Where(query, locale, scope.PrimaryKeyValue()).Count(&count); count == 0 {
						scope.DB().Create(scope.Value)
					}
				}
			} else if syncColumns := syncColumns(scope); len(syncColumns) > 0 { // is global
				if mode, _ := scope.DB().Get("l10n:mode"); mode != "unscoped" {
					if scope.DB().RowsAffected > 0 {
						var primaryField = scope.PrimaryField()
						var syncAttrs = map[string]interface{}{}

						if updateAttrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
							for key, value := range updateAttrs.(map[string]interface{}) {
								for _, syncColumn := range syncColumns {
									if syncColumn == key {
										syncAttrs[syncColumn] = value
										break
									}
								}
							}
						} else {
							var fields = scope.Fields()
							for _, syncColumn := range syncColumns {
								if field, ok := fields[syncColumn]; ok && field.IsNormal {
									syncAttrs[syncColumn] = field.Field.Interface()
								}
							}
						}

						if len(syncAttrs) > 0 {
							db := scope.DB().Model(reflect.New(utils.ModelType(scope.Value)).Interface()).Set("l10n:mode", "unscoped").Where("language_code <> ?", Global)
							if !primaryField.IsBlank {
								db = db.Where(fmt.Sprintf("%v = ?", primaryField.DBName), primaryField.Field.Interface())
							}
							scope.Err(db.UpdateColumns(syncAttrs).Error)
						}
					}
				}
			}
		}
	}
}

func initalizePosition(scope *gorm.Scope) {
	if !scope.HasError() {
		if position, ok := scope.Value.(sortingInterface); ok {
			if pos, err := strconv.Atoi(fmt.Sprintf("%v", scope.PrimaryKeyValue())); err == nil {
				if scope.DB().UpdateColumn("position", pos).Error == nil {
					position.SetPosition(pos)
				}
			}
		}
	}
}

func isProductionModeAndNewScope(scope *gorm.Scope) (isProduction bool, clone *gorm.Scope) {
	if !IsDraftMode(scope.DB()) {
		if _, ok := scope.InstanceGet("publish:supported_model"); ok {
			table := OriginalTableName(scope.TableName())
			clone := scope.New(scope.Value)
			clone.Search.Table(table)
			return true, clone
		}
	}
	return false, nil
}

func syncUpdateFromProductionToDraft(scope *gorm.Scope) {
	if !scope.HasError() {
		if ok, clone := isProductionModeAndNewScope(scope); ok {
			if updateAttrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
				table := OriginalTableName(scope.TableName())
				clone.Search = scope.Search
				clone.Search.Table(table)
				clone.InstanceSet("gorm:update_attrs", updateAttrs)
			}
			scope.DB().Callback().Update().Get("gorm:update")(clone)
		}
	}
}

func assignCreatedBy(scope *gorm.Scope) {
	if isAuditable(scope) {
		if user, ok := scope.DB().Get("audited:current_user"); ok {
			var currentUser string
			if primaryField := scope.New(user).PrimaryField(); primaryField != nil {
				currentUser = fmt.Sprintf("%v", primaryField.Field.Interface())
			} else {
				currentUser = fmt.Sprintf("%v", user)
			}

			scope.SetColumn("CreatedBy", currentUser)
		}
	}
}

func beforeUpdate(scope *gorm.Scope) {
	if isLocalizable(scope) {
		locale, isLocale := getLocale(scope)

		switch mode, _ := scope.DB().Get("l10n:mode"); mode {
		case "unscoped":
		default:
			scope.Search.Where("language_code = ?", locale)
			setLocale(scope, locale)
		}

		if isLocale {
			scope.Search.Omit(syncColumns(scope)...)
		}
	}
}

func deleteScope(scope *gorm.Scope) {
	if !scope.HasError() {
		_, supportedModel := scope.InstanceGet("publish:supported_model")
		if supportedModel && IsDraftMode(scope.DB()) {
			scope.Raw(
				fmt.Sprintf("UPDATE %v SET deleted_at=%v, publish_status=%v %v",
					scope.QuotedTableName(),
					scope.AddToVars(gorm.NowFunc()),
					scope.AddToVars(DIRTY),
					scope.CombinedConditionSql(),
				))
			scope.Exec()
		} else {
			gorm.Delete(scope)
		}
	}
}

func assignUpdatedBy(scope *gorm.Scope) {
	if isAuditable(scope) {
		if user, ok := scope.DB().Get("audited:current_user"); ok {
			var currentUser string
			if primaryField := scope.New(user).PrimaryField(); primaryField != nil {
				currentUser = fmt.Sprintf("%v", primaryField.Field.Interface())
			} else {
				currentUser = fmt.Sprintf("%v", user)
			}

			if attrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
				updateAttrs := attrs.(map[string]interface{})
				updateAttrs["updated_by"] = currentUser
				scope.InstanceSet("gorm:update_attrs", updateAttrs)
			} else {
				scope.SetColumn("UpdatedBy", currentUser)
			}
		}
	}
}

func afterUpdate(scope *gorm.Scope) {
	if !scope.HasError() {
		if isLocalizable(scope) {
			if locale, ok := getLocale(scope); ok {
				if scope.DB().RowsAffected == 0 && !scope.PrimaryKeyZero() { //is locale and nothing updated
					var count int
					var query = fmt.Sprintf("%v.language_code = ? AND %v.%v = ?", scope.QuotedTableName(), scope.QuotedTableName(), scope.PrimaryKey())
					if scope.NewDB().Table(scope.TableName()).Where(query, locale, scope.PrimaryKeyValue()).Count(&count); count == 0 {
						scope.DB().Create(scope.Value)
					}
				}
			} else if syncColumns := syncColumns(scope); len(syncColumns) > 0 { // is global
				if mode, _ := scope.DB().Get("l10n:mode"); mode != "unscoped" {
					if scope.DB().RowsAffected > 0 {
						primaryKey := scope.PrimaryKeyValue()

						if updateAttrs, ok := scope.InstanceGet("gorm:update_attrs"); ok {
							var syncAttrs = map[string]interface{}{}
							for key, value := range updateAttrs.(map[string]interface{}) {
								for _, syncColumn := range syncColumns {
									if syncColumn == key {
										syncAttrs[syncColumn] = value
										break
									}
								}
							}
							if len(syncAttrs) > 0 {
								scope.DB().Model(scope.Value).Set("l10n:mode", "unscoped").Where("language_code <> ?", Global).UpdateColumns(syncAttrs)
							}
						} else {
							scope.NewDB().Set("l10n:mode", "unscoped").Where(fmt.Sprintf("%v = ?", scope.PrimaryKey()), primaryKey).Select(syncColumns).Save(scope.Value)
						}
					}
				}
			}
		}
	}
}