64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
|
// Copyright 2012 James Cooper. All rights reserved.
|
||
|
|
// Use of this source code is governed by a MIT-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
// Package gorp provides a simple way to marshal Go structs to and from
|
||
|
|
// SQL databases. It uses the database/sql package, and should work with any
|
||
|
|
// compliant database/sql driver.
|
||
|
|
//
|
||
|
|
// Source code and project home:
|
||
|
|
// https://github.com/go-gorp/gorp
|
||
|
|
//
|
||
|
|
package gorp
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"reflect"
|
||
|
|
)
|
||
|
|
|
||
|
|
// OptimisticLockError is returned by Update() or Delete() if the
|
||
|
|
// struct being modified has a Version field and the value is not equal to
|
||
|
|
// the current value in the database
|
||
|
|
type OptimisticLockError struct {
|
||
|
|
// Table name where the lock error occurred
|
||
|
|
TableName string
|
||
|
|
|
||
|
|
// Primary key values of the row being updated/deleted
|
||
|
|
Keys []interface{}
|
||
|
|
|
||
|
|
// true if a row was found with those keys, indicating the
|
||
|
|
// LocalVersion is stale. false if no value was found with those
|
||
|
|
// keys, suggesting the row has been deleted since loaded, or
|
||
|
|
// was never inserted to begin with
|
||
|
|
RowExists bool
|
||
|
|
|
||
|
|
// Version value on the struct passed to Update/Delete. This value is
|
||
|
|
// out of sync with the database.
|
||
|
|
LocalVersion int64
|
||
|
|
}
|
||
|
|
|
||
|
|
// Error returns a description of the cause of the lock error
|
||
|
|
func (e OptimisticLockError) Error() string {
|
||
|
|
if e.RowExists {
|
||
|
|
return fmt.Sprintf("gorp: OptimisticLockError table=%s keys=%v out of date version=%d", e.TableName, e.Keys, e.LocalVersion)
|
||
|
|
}
|
||
|
|
|
||
|
|
return fmt.Sprintf("gorp: OptimisticLockError no row found for table=%s keys=%v", e.TableName, e.Keys)
|
||
|
|
}
|
||
|
|
|
||
|
|
func lockError(m *DbMap, exec SqlExecutor, tableName string,
|
||
|
|
existingVer int64, elem reflect.Value,
|
||
|
|
keys ...interface{}) (int64, error) {
|
||
|
|
|
||
|
|
existing, err := get(m, exec, elem.Interface(), keys...)
|
||
|
|
if err != nil {
|
||
|
|
return -1, err
|
||
|
|
}
|
||
|
|
|
||
|
|
ole := OptimisticLockError{tableName, keys, true, existingVer}
|
||
|
|
if existing == nil {
|
||
|
|
ole.RowExists = false
|
||
|
|
}
|
||
|
|
return -1, ole
|
||
|
|
}
|