本文整理匯總了Golang中github.com/pingcap/tidb/kv.RetrieverMutator.Get方法的典型用法代碼示例。如果您正苦於以下問題：Golang RetrieverMutator.Get方法的具體用法？Golang RetrieverMutator.Get怎麽用？Golang RetrieverMutator.Get使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/pingcap/tidb/kv.RetrieverMutator的用法示例。
在下文中一共展示了RetrieverMutator.Get方法的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: Exist
func (c *index) Exist(rm kv.RetrieverMutator, indexedValues []types.Datum, h int64) (bool, int64, error) {
key, distinct, err := c.GenIndexKey(indexedValues, h)
if err != nil {
return false, 0, errors.Trace(err)
}
value, err := rm.Get(key)
if kv.IsErrNotFound(err) {
return false, 0, nil
}
if err != nil {
return false, 0, errors.Trace(err)
}
// For distinct index, the value of key is handle.
if distinct {
handle, err := decodeHandle(value)
if err != nil {
return false, 0, errors.Trace(err)
}
if handle != h {
return true, handle, errors.Trace(kv.ErrKeyExists)
}
return true, handle, nil
}
return true, h, nil
}示例2: Create
// Create creates a new entry in the kvIndex data.
// If the index is unique and there is an existing entry with the same key, Create will return ErrKeyExists.
func (c *index) Create(rm kv.RetrieverMutator, indexedValues []types.Datum, h int64) error {
key, distinct, err := c.GenIndexKey(indexedValues, h)
if err != nil {
return errors.Trace(err)
}
if !distinct {
// TODO: reconsider value
err = rm.Set(key, []byte("timestamp?"))
return errors.Trace(err)
}
_, err = rm.Get(key)
if kv.IsErrNotFound(err) {
err = rm.Set(key, encodeHandle(h))
return errors.Trace(err)
}
return errors.Trace(kv.ErrKeyExists)
}示例3: Create
// Create creates a new entry in the kvIndex data.
// If the index is unique and there is an existing entry with the same key,
// Create will return the existing entry's handle as the first return value, ErrKeyExists as the second return value.
func (c *index) Create(rm kv.RetrieverMutator, indexedValues []types.Datum, h int64) (int64, error) {
key, distinct, err := c.GenIndexKey(indexedValues, h)
if err != nil {
return 0, errors.Trace(err)
}
if !distinct {
// non-unique index doesn't need store value, write a '0' to reduce space
err = rm.Set(key, []byte{'0'})
return 0, errors.Trace(err)
}
value, err := rm.Get(key)
if kv.IsErrNotFound(err) {
err = rm.Set(key, encodeHandle(h))
return 0, errors.Trace(err)
}
handle, err := decodeHandle(value)
if err != nil {
return 0, errors.Trace(err)
}
return handle, errors.Trace(kv.ErrKeyExists)
}