mirror of
https://github.com/lancedb/lancedb.git
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Brendan Clement
758f738b8c
This PR is part of the documentation revamp. Once the full set of PRs is merged, we’ll publish the combined site to staging for review before updating docs.lancedb.com. Ingestion, search and integration examples are incomplete or inconsistent across languages, and some guidance misstates SDK behavior. This brings the guides and their example sources together. It includes complete Python, TypeScript and Rust workflows, isolated provider and reranker examples, the Superlinked corrections, and guidance on retries that can duplicate writes. Stacked on #4491. Each MDX file has one PR owner. Rebase onto main after #4491 is squash-merged. Local assembly, Mint validation and link checks pass. Example code is unchanged from the previously validated package. Publication stays held through integration.
65 lines
2.0 KiB
Rust
65 lines
2.0 KiB
Rust
// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: Copyright The LanceDB Authors
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// --8<-- [start:example]
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use std::sync::Arc;
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use arrow_array::{Int64Array, RecordBatch, RecordBatchIterator, RecordBatchReader, StringArray};
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use arrow_schema::{DataType, Field, Schema};
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use futures::TryStreamExt;
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use lancedb::query::ExecutableQuery;
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fn make_users_reader(rows: &[(i64, &str)]) -> Box<dyn RecordBatchReader + Send> {
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let schema = Arc::new(Schema::new(vec![
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Field::new("id", DataType::Int64, false),
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Field::new("name", DataType::Utf8, false),
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]));
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let batch = RecordBatch::try_new(
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schema.clone(),
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vec![
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Arc::new(Int64Array::from_iter_values(rows.iter().map(|r| r.0))),
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Arc::new(StringArray::from_iter_values(rows.iter().map(|r| r.1))),
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],
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)
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.unwrap();
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Box::new(RecordBatchIterator::new(
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vec![Ok(batch)].into_iter(),
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schema,
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))
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}
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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let directory = tempfile::tempdir()?;
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let db = lancedb::connect(directory.path().to_str().unwrap())
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.execute()
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.await?;
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let table = db
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.create_table("users", make_users_reader(&[(1, "Alice")]))
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.execute()
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.await?;
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table
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.add(make_users_reader(&[(2, "Bob"), (3, "Charlie")]))
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.progress(|progress| println!("Rows written: {}", progress.output_rows()))
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.execute()
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.await?;
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let rows: Vec<RecordBatch> = table.query().execute().await?.try_collect().await?;
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println!("After insertion: {rows:?}");
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assert_eq!(table.count_rows(None).await?, 3);
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assert_eq!(
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table
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.count_rows(Some("id = 1 AND name = 'Alice'".into()))
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.await?,
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1
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);
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assert_eq!(
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table
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.count_rows(Some("id = 2 AND name = 'Bob'".into()))
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.await?,
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1
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);
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assert_eq!(table.count_rows(Some("id = 3".into())).await?, 1);
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Ok(())
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}
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// --8<-- [end:example]
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