Struct native_db::transaction::query::PrimaryScan

pub struct PrimaryScan<PrimaryTable, T: Input>
where
    PrimaryTable: ReadableTable<DatabaseInnerKeyValue, &'static [u8]>,
{ /* private fields */ }

Scan values from the database.

Implementations

impl<PrimaryTable, T: Input> PrimaryScan<PrimaryTable, T>

where PrimaryTable: ReadableTable<DatabaseInnerKeyValue, &'static [u8]>,

pub fn all(&self) -> PrimaryScanIterator<'_, T>

Iterate over all values.

Example

use native_db::*;
use native_model::{native_model, Model};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[native_model(id=1, version=1)]
#[native_db]
struct Data {
    #[primary_key]
    id: u64,
}

fn main() -> Result<(), db_type::Error> {
    let mut builder = DatabaseBuilder::new();
    builder.define::<Data>()?;
    let db = builder.create_in_memory()?;
     
    // Open a read transaction
    let r = db.r_transaction()?;
     
    // Get all values
    let _values: Vec<Data> = r.scan().primary()?.all().collect();
    Ok(())
}

pub fn range<TR: InnerKeyValue, R: RangeBounds<TR>>( &self, range: R ) -> PrimaryScanIterator<'_, T>

Iterate over all values in a range.

Example

use native_db::*;
use native_model::{native_model, Model};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[native_model(id=1, version=1)]
#[native_db]
struct Data {
    #[primary_key]
    id: u64,
}

fn main() -> Result<(), db_type::Error> {
    let mut builder = DatabaseBuilder::new();
    builder.define::<Data>()?;
    let db = builder.create_in_memory()?;
     
    // Open a read transaction
    let r = db.r_transaction()?;
     
    // Get the values from 5 to the end
    let _values: Vec<Data> = r.scan().primary()?.range(5u64..).collect();
    Ok(())
}

pub fn start_with<'a>( &'a self, start_with: impl InnerKeyValue + 'a ) -> PrimaryScanIteratorStartWith<'a, T>

Iterate over all values starting with a prefix.

Example

use native_db::*;
use native_model::{native_model, Model};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[native_model(id=1, version=1)]
#[native_db]
struct Data {
    #[primary_key]
    id: String,
}

fn main() -> Result<(), db_type::Error> {
    let mut builder = DatabaseBuilder::new();
    builder.define::<Data>()?;
    let db = builder.create_in_memory()?;
     
    // Open a read transaction
    let r = db.r_transaction()?;
     
    // Get the values starting with "victor"
    let _values: Vec<Data> = r.scan().primary()?.start_with("victor").collect();
    Ok(())
}