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b/__database/duckdb-demo/src/main.rs new file mode 100644 index 0000000..e232d31 --- /dev/null +++ b/__database/duckdb-demo/src/main.rs @@ -0,0 +1,55 @@ +use duckdb::{params, Connection, Result}; + +use duckdb::arrow::record_batch::RecordBatch; +use duckdb::arrow::util::pretty::print_batches; + +#[derive(Debug)] +struct Person { + id: i32, + name: String, + data: Option>, +} + +fn main() -> Result<()> { + let conn = Connection::open_in_memory()?; + + conn.execute_batch( + r"CREATE SEQUENCE seq; + CREATE TABLE person ( + id INTEGER PRIMARY KEY DEFAULT NEXTVAL('seq'), + name TEXT NOT NULL, + data BLOB + ); + ")?; + + let me = Person { + id: 0, + name: "Steven".to_string(), + data: None, + }; + conn.execute( + "INSERT INTO person (name, data) VALUES (?, ?)", + params![me.name, me.data], + )?; + + // query table by rows + let mut stmt = conn.prepare("SELECT id, name, data FROM person")?; + let person_iter = stmt.query_map([], |row| { + Ok(Person { + id: row.get(0)?, + name: row.get(1)?, + data: row.get(2)?, + }) + })?; + + for person in person_iter { + let p = person.unwrap(); + println!("ID: {}", p.id); + println!("Found person {:?}", p); + } + + // query table by arrow + let rbs: Vec = stmt.query_arrow([])?.collect(); + print_batches(&rbs).unwrap(); + Ok(()) +} \ No newline at end of file