https://github.com/streamingfast/substreams-sink-database-changes

https://github.com/streamingfast/substreams-sink-database-changes

Last synced: about 2 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/streamingfast/substreams-sink-database-changes
• Owner: streamingfast
• License: apache-2.0
• Created: 2022-06-21T13:21:22.000Z (about 2 years ago)
• Default Branch: develop
• Last Pushed: 2024-01-30T20:21:48.000Z (5 months ago)
• Last Synced: 2024-04-22T15:09:09.984Z (2 months ago)
• Language: Rust
• Size: 224 KB
• Stars: 0
• Watchers: 2
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Lists

• awesome-substreams - DatabaseChanges - [`sf.substreams.sink.database.v1`](https://github.com/streamingfast/substreams-database-change/blob/develop/proto/substreams/sink/database/v1/database.proto) (Protobuf / Sinks)

README

        
# Substreams Sink Database Changes

[](https://github.com/streamingfast/substreams-sink-database-changes)

[](https://crates.io/crates/substreams-database-change)

[](https://docs.rs/substreams-database-change)

[](https://github.com/streamingfast/substreams-sink-database-changes/actions?query=branch%3Adevelop)

> `substreams-sink-database-changes` contains all the definitions for database changes which can be emitted by a substream.

## Used by

- [substreams-sink-postgres](https://github.com/streamingfast/substreams-sink-postgres)

- [substreams-sink-mongodb](https://github.com/streamingfast/substreams-sink-mongodb)

## Install

```bash

# The Rust crate is named substreams-database-change for historical reasons

cargo add substreams-database-change

```

## Quickstart

**Cargo.toml**

```toml

[dependencies]

substreams = "0.5"

substreams-database-change = "1.0"

```

**src/lib.rs**

```rust

use substreams::errors::Error;

use substreams_database_change::pb::database::{DatabaseChanges, table_change::Operation};

#[substreams::handlers::map]

fn db_out(

    ... some stores ...

) -> Result {

    // Initialize Database Changes container

    let mut database_changes: DatabaseChanges = Default::default();

    // Push change

    database_changes.push_change("transfer", "primary-key", 0, Operation::Create)

        .change("key1", ("previous1", "value1"))

        .change("key2", ("previous2", "value2"));

    Ok(database_changes)

}

```

### Re-generate Protobuf

Be sure to have `buf` CLI installed (https://buf.build/docs/installation/) and run:

```bash

buf generate proto

```