public interface WriteBatchInterface
Defines the interface for a Write Batch which holds a collection of updates to apply atomically to a DB.
Modifier and Type | Method and Description |
---|---|
void |
clear()
Clear all updates buffered in this batch
|
int |
count()
Returns the number of updates in the batch.
|
void |
deleteRange(byte[] beginKey,
byte[] endKey)
Removes the database entries in the range ["beginKey", "endKey"), i.e.,
including "beginKey" and excluding "endKey".
|
void |
deleteRange(ColumnFamilyHandle columnFamilyHandle,
byte[] beginKey,
byte[] endKey)
Removes the database entries in the range ["beginKey", "endKey"), i.e.,
including "beginKey" and excluding "endKey".
|
void |
merge(byte[] key,
byte[] value)
Merge "value" with the existing value of "key" in the database.
|
void |
merge(ColumnFamilyHandle columnFamilyHandle,
byte[] key,
byte[] value)
Merge "value" with the existing value of "key" in given column family.
|
void |
put(byte[] key,
byte[] value)
Store the mapping "key->value" in the database.
|
void |
put(ColumnFamilyHandle columnFamilyHandle,
byte[] key,
byte[] value)
Store the mapping "key->value" within given column
family.
|
void |
putLogData(byte[] blob)
Append a blob of arbitrary size to the records in this batch.
|
void |
remove(byte[] key)
If the database contains a mapping for "key", erase it.
|
void |
remove(ColumnFamilyHandle columnFamilyHandle,
byte[] key)
If column family contains a mapping for "key", erase it.
|
void |
rollbackToSavePoint()
Remove all entries in this batch (Put, Merge, Delete, PutLogData) since
the most recent call to SetSavePoint() and removes the most recent save
point.
|
void |
setSavePoint()
Records the state of the batch for future calls to RollbackToSavePoint().
|
int count()
void put(byte[] key, byte[] value)
Store the mapping "key->value" in the database.
key
- the specified key to be inserted.value
- the value associated with the specified key.void put(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value)
Store the mapping "key->value" within given column family.
columnFamilyHandle
- ColumnFamilyHandle
instancekey
- the specified key to be inserted.value
- the value associated with the specified key.void merge(byte[] key, byte[] value)
Merge "value" with the existing value of "key" in the database. "key->merge(existing, value)"
key
- the specified key to be merged.value
- the value to be merged with the current value for
the specified key.void merge(ColumnFamilyHandle columnFamilyHandle, byte[] key, byte[] value)
Merge "value" with the existing value of "key" in given column family. "key->merge(existing, value)"
columnFamilyHandle
- ColumnFamilyHandle
instancekey
- the specified key to be merged.value
- the value to be merged with the current value for
the specified key.void remove(byte[] key)
If the database contains a mapping for "key", erase it. Else do nothing.
key
- Key to delete within databasevoid remove(ColumnFamilyHandle columnFamilyHandle, byte[] key)
If column family contains a mapping for "key", erase it. Else do nothing.
columnFamilyHandle
- ColumnFamilyHandle
instancekey
- Key to delete within databasevoid deleteRange(byte[] beginKey, byte[] endKey)
beginKey
- First key to delete within database (included)endKey
- Last key to delete within database (excluded)void deleteRange(ColumnFamilyHandle columnFamilyHandle, byte[] beginKey, byte[] endKey)
columnFamilyHandle
- ColumnFamilyHandle
instancebeginKey
- First key to delete within database (included)endKey
- Last key to delete within database (excluded)void putLogData(byte[] blob)
blob
- binary object to be insertedvoid clear()
void setSavePoint()
void rollbackToSavePoint() throws RocksDBException
RocksDBException
- if there is no previous call to SetSavePoint()