Module leo_backend_db_eleveldb

Description
Function Index
Function Details

Handling database operation for eleveldb.

References

https://github.com/leo-project/leo_backend_db/blob/master/src/leo_backend_db_eleveldb.erl

Description

Handling database operation for eleveldb

Function Index

close/1	Close a leveldb data store and flush any pending writes to disk.
count/1	Count the number of records from eleveldb.
delete/2	Delete an object from the eleveldb.
first/1	Retrieve a first record from eleveldb.
first_n/3	Fetch first N records from eleveldb.
get/2	Retrieve an object from the eleveldb.
open/1	Open a new or existing leveldb datastore for read-only access.
open/2
prefix_search/4	Retrieve objects from eleveldb by a keyword.
put/3	Insert an object into the eleveldb.
status_compaction/1	Retrieve the compaction status.

Function Details

close/1

close(Handler) -> ok

Handler = eleveldb:db_ref()

Close a leveldb data store and flush any pending writes to disk

count/1

count(Handler) -> {ok, Count} | {error, any()}

Handler = eleveldb:db_ref()
Count = non_neg_integer()

Count the number of records from eleveldb.

delete/2

delete(Handler, Key) -> ok | {error, any()}

Handler = eleveldb:db_ref()
Key = binary()

Delete an object from the eleveldb.

first/1

first(Handler) -> {ok, any()} | not_found | {error, any()}

Handler = eleveldb:db_ref()

Retrieve a first record from eleveldb.

first_n/3

first_n(Handler, N, Condition) -> {ok, [term()]} | not_found | {error, any()}

Handler = eleveldb:db_ref()
N = pos_integer()
Condition = function()

Fetch first N records from eleveldb.

get/2

get(Handler, Key) -> {ok, binary()} | not_found | {error, any()}

Handler = eleveldb:db_ref()
Key = binary()

Retrieve an object from the eleveldb.

open/1

open(Path) -> {error, any()} | {ok, pid()}

Path = string()

Open a new or existing leveldb datastore for read-only access

open/2

open(Path, Config) -> {error, any()} | {ok, pid()}

Path = string()
Config = [tuple()]

prefix_search/4

prefix_search(Handler, Key, Fun, MaxKeys) -> {ok, [term()]} | not_found | {error, any()}

Handler = eleveldb:db_ref()
Key = binary()
Fun = function()
MaxKeys = integer()

Retrieve objects from eleveldb by a keyword.

put/3

put(Handler, Key, Value) -> ok | {error, any()}

Handler = eleveldb:db_ref()
Key = binary()
Value = binary()

Insert an object into the eleveldb.

status_compaction/1

status_compaction(Handler) -> binary()

Handler = eleveldb:db_ref()

Retrieve the compaction status

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