Write basic SQLite/rusqlite code

main
Elnu 2 years ago
parent fd41429c99
commit 0ef7ad481e

@ -1,3 +1,62 @@
fn main() { use rusqlite::{params, Connection, Result};
println!("Hello, world!"); #[macro_use]
extern crate juniper;
#[derive(Debug, GraphQLObject)]
#[graphql(description="A comment on some content, such as a blog post.")]
struct Comment {
author: Option<String>, // null is Anonymous
text: String
}
struct Database {
conn: Connection
}
impl Database {
fn new() -> Result<Self> {
let conn = Connection::open_in_memory()?;
conn.execute(
"CREATE TABLE comment (
id INTEGER PRIMARY KEY,
author TEXT,
text TEXT NOT NULL
)",
params![]
)?;
Ok(Self { conn })
}
fn get_comments(&self) -> Result<Vec<Comment>> {
self.conn
.prepare("SELECT author, text FROM comment")?
.query_map([], |row| {
Ok(Comment {
author: row.get(0)?,
text: row.get(1)?,
})
})?
.collect()
}
fn create_comment(&self, comment: &Comment) -> Result<()> {
self.conn.execute(
"INSERT INTO comment (author, text) VALUES (?1, ?2)",
params![&comment.author, &comment.text],
)?;
Ok(())
}
}
fn main() -> Result<()> {
let db = Database::new()?;
let comment = Comment {
author: Some("Elnu".to_string()), // None for anonymous
text: "This is a test comment by yours truly!".to_string(),
};
db.create_comment(&comment)?;
for comment in db.get_comments()?.iter() {
println!("Found comment {:?}", comment);
}
Ok(())
} }

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