mirror of
https://github.com/fluencelabs/sqlite-wasm-connector
synced 2025-04-25 00:32:14 +00:00
114 lines
2.8 KiB
Markdown
114 lines
2.8 KiB
Markdown
# SQLite [![Version][version-img]][version-url] [![Status][status-img]][status-url]
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The package provides an interface to [SQLite][1].
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## [Documentation][doc]
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## Example
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Create a table, insert a couple of rows, and fetch one:
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```rust
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let connection = sqlite::open(":memory:").unwrap();
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connection.execute("
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CREATE TABLE users (name TEXT, age INTEGER);
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INSERT INTO users (name, age) VALUES ('Alice', 42);
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INSERT INTO users (name, age) VALUES ('Bob', 69);
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").unwrap();
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connection.process("SELECT * FROM users WHERE age > 50", |pairs| {
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for &(column, value) in pairs.iter() {
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println!("{} = {}", column, value.unwrap());
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}
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true
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}).unwrap();
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```
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The same example using prepared statements:
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```rust
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use sqlite::State;
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let connection = sqlite::open(":memory:").unwrap();
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connection.execute("
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CREATE TABLE users (name TEXT, age INTEGER)
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").unwrap();
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let mut statement = connection.prepare("
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INSERT INTO users (name, age) VALUES (?, ?)
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").unwrap();
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statement.bind(1, "Alice").unwrap();
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statement.bind(2, 42).unwrap();
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assert_eq!(statement.step().unwrap(), State::Done);
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statement.reset().unwrap();
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statement.bind(1, "Bob").unwrap();
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statement.bind(2, 69).unwrap();
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assert_eq!(statement.step().unwrap(), State::Done);
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let mut statement = connection.prepare("
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SELECT * FROM users WHERE age > 50
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").unwrap();
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while let State::Row = statement.step().unwrap() {
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println!("name = {}", statement.read::<String>(0).unwrap());
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println!("age = {}", statement.read::<i64>(1).unwrap());
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}
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```
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The same example using iterators:
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```rust
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use sqlite::Value;
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let connection = sqlite::open(":memory:").unwrap();
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connection.execute("
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CREATE TABLE users (name TEXT, age INTEGER)
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").unwrap();
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let mut iterator = connection.prepare("
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INSERT INTO users (name, age) VALUES (?, ?)
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").unwrap().into_iter().unwrap();
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iterator.start(&[
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Value::String("Alice".to_string()), Value::Integer(42),
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]).unwrap();
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iterator.start(&[
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Value::String("Bob".to_string()), Value::Integer(69),
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]).unwrap();
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let mut iterator = connection.prepare("
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SELECT * FROM users WHERE age > 50
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").unwrap().into_iter().unwrap();
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while let Some(row) = iterator.next().unwrap() {
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match (&row[0], &row[1]) {
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(&Value::String(ref name), &Value::Integer(age)) => {
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println!("name = {}", name);
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println!("age = {}", age);
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},
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_ => unreachable!(),
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}
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}
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```
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## Contributing
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1. Fork the project.
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2. Implement your idea.
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3. Open a pull request.
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[1]: https://www.sqlite.org
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[version-img]: http://stainless-steel.github.io/images/crates.svg
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[version-url]: https://crates.io/crates/sqlite
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[status-img]: https://travis-ci.org/stainless-steel/sqlite.svg?branch=master
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[status-url]: https://travis-ci.org/stainless-steel/sqlite
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[doc]: https://stainless-steel.github.io/sqlite
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