mirror of
https://github.com/fluencelabs/sqlite-wasm-connector
synced 2025-03-15 06:20:50 +00:00
Option<T> is generally used to represent either a T or a null value. In SQLite, it makes sense to model this as either a regular T binding (when the option is Some) or a regular NULL binding (when the option is None). This commit implements Bindable for any Option<T> where T is already Bindable, allowing those Options to be used directly with statements, filling in NULL where needed. No new unsafe code is needed. Tests are included.
SQLite

The package provides an interface to SQLite.
Example
Open a connection, create a table, and insert some rows:
let connection = sqlite::open(":memory:").unwrap();
connection
.execute(
"
CREATE TABLE users (name TEXT, age INTEGER);
INSERT INTO users VALUES ('Alice', 42);
INSERT INTO users VALUES ('Bob', 69);
",
)
.unwrap();
Select some rows and process them one by one as plain text:
connection
.iterate("SELECT * FROM users WHERE age > 50", |pairs| {
for &(column, value) in pairs.iter() {
println!("{} = {}", column, value.unwrap());
}
true
})
.unwrap();
The same query using a prepared statement, which is much more efficient than the previous technique:
use sqlite::State;
let mut statement = connection
.prepare("SELECT * FROM users WHERE age > ?")
.unwrap();
statement.bind(1, 50).unwrap();
while let State::Row = statement.next().unwrap() {
println!("name = {}", statement.read::<String>(0).unwrap());
println!("age = {}", statement.read::<i64>(1).unwrap());
}
The same query using a cursor, which is a wrapper around a prepared statement providing the concept of row and featuring all-at-once binding:
use sqlite::Value;
let mut cursor = connection
.prepare("SELECT * FROM users WHERE age > ?")
.unwrap()
.cursor();
cursor.bind(&[Value::Integer(50)]).unwrap();
while let Some(row) = cursor.next().unwrap() {
println!("name = {}", row[0].as_string().unwrap());
println!("age = {}", row[1].as_integer().unwrap());
}
Contribution
Your contribution is highly appreciated. Do not hesitate to open an issue or a pull request. Note that any contribution submitted for inclusion in the project will be licensed according to the terms given in LICENSE.md.
Description
Languages
Rust
99.3%
Shell
0.7%