58 lines
2.3 KiB
Markdown
58 lines
2.3 KiB
Markdown
database
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========
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[](https://github.com/decred/dcrd/actions)
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[](http://copyfree.org)
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[](https://pkg.go.dev/github.com/decred/dcrd/database/v2)
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Package database provides a block and metadata storage database.
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Please note that this package is intended to enable dcrd to support different
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database backends and is not something that a client can directly access as only
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one entity can have the database open at a time (for most database backends),
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and that entity will be dcrd.
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When a client wants programmatic access to the data provided by dcrd, they'll
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likely want to use the [dcrrpcclient](https://github.com/decred/dcrrpcclient)
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package which makes use of the [JSON-RPC API](https://github.com/decred/dcrd/tree/master/docs/json_rpc_api.mediawiki).
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However, this package could be extremely useful for any applications requiring
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Decred block storage capabilities.
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The default backend, ffldb, has a strong focus on speed, efficiency, and
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robustness. It makes use of leveldb for the metadata, flat files for block
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storage, and strict checksums in key areas to ensure data integrity.
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## Feature Overview
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- Key/value metadata store
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- Decred block storage
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- Efficient retrieval of block headers and regions (transactions, scripts, etc)
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- Read-only and read-write transactions with both manual and managed modes
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- Nested buckets
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- Iteration support including cursors with seek capability
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- Supports registration of backend databases
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- Comprehensive test coverage
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## Installation
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```bash
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$ go get github.com/decred/dcrd/database2
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```
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## Examples
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* [Basic Usage Example](https://pkg.go.dev/github.com/decred/dcrd/database/v2#example-package-BasicUsage)
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Demonstrates creating a new database and using a managed read-write
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transaction to store and retrieve metadata.
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* [Block Storage and Retrieval Example](https://pkg.go.dev/github.com/decred/dcrd/database/v2#example-package-BlockStorageAndRetrieval)
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Demonstrates creating a new database, using a managed read-write transaction
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to store a block, and then using a managed read-only transaction to fetch the
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block.
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## License
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Package database is licensed under the [copyfree](http://copyfree.org) ISC
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License.
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