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49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
# Using `sqlite-vec` in Rust
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[](https://crates.io/crates/sqlite-vec)
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You can embed `sqlite-vec` into your Rust projects using the official
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[`sqlite-vec` crate](https://crates.io/crates/sqlite-vec).
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```bash
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cargo add sqlite-vec
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```
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The crate embeds the `sqlite-vec` C source code, and uses the
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[`cc` crate](https://crates.io/crates/sqlite-vec) to compile and statically link
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`sqlite-vec` at build-time.
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The `sqlite-vec` crate exposes a single function `sqlite3_vec_init`, which is
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the C entrypoint for the SQLite extension. You can "register" with your Rust
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SQLite library's `sqlite3_auto_extension()` function. Here's an example with
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`rusqlite`:
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```rs
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use sqlite_vec::sqlite3_vec_init;
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use rusqlite::{ffi::sqlite3_auto_extension, Result};
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fn main()-> Result<()> {
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unsafe {
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sqlite3_auto_extension(Some(std::mem::transmute(sqlite3_vec_init as *const ())));
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}
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// future database connection will now automatically include sqlite-vec functions!
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let db = Connection::open_in_memory()?;
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let vec_version: String = db.query_row("select vec_version()", &[v.as_bytes()], |x| x.get(0)?)?;
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println!("vec_version={vec_version}");
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Ok(())
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}
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```
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See
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[`simple-rust/demo.rs`](https://github.com/asg017/sqlite-vec/blob/main/examples/simple-rust/demo.rs)
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for a more complete Rust demo.
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## Working with vectors in Rust
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If your vectors are provided as a `Vec<f32>` type, the [`zerocopy` crate](https://crates.io/crates/zerocopy) is recommended, specifically `zerocopy::AsBytes`. This will allow you to pass in vectors into `sqlite-vec` without any copying.
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```rs
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let query: Vec<f32> = vec![0.1, 0.2, 0.3, 0.4];
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let mut stmt = db.prepare("SELECT vec_length(?)")?;
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stmt.execute(&[item.1.as_bytes()])?;
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```
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