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feat: add native db demo

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Hatter Jiang
2024-05-04 11:15:28 +08:00
parent f107f82b7c
commit 22344b6d96
4 changed files with 555 additions and 1 deletions
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496
__database/native_db-demo/Cargo.lock generated Normal file
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11
__database/native_db-demo/Cargo.toml Normal file
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[package]
name = "native_db-demo"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
native_db = "0.6.0"
native_model = "0.4.18"
serde = "1.0.200"

46
__database/native_db-demo/src/main.rs Normal file
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use native_db::*;
use native_model::Model;
use native_model::native_model;
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, PartialEq, Debug)]
#[native_model(id = 1, version = 1)]
#[native_db]
struct Item {
#[primary_key]
id: u32,
#[secondary_key]
name: String,
}
fn main() -> Result<(), db_type::Error> {
let mut builder = DatabaseBuilder::new();
// Initialize the model
builder.define::<Item>()?;
// Create a database in memory
let db = builder.create_in_memory()?;
// Insert data (open a read-write transaction)
let rw = db.rw_transaction().unwrap();
rw.insert(Item { id: 1, name: "red".to_string() })?;
rw.insert(Item { id: 2, name: "green".to_string() })?;
rw.insert(Item { id: 3, name: "blue".to_string() })?;
rw.commit()?;
// Open a read-only transaction
let r = db.r_transaction()?;
// Retrieve data with id=3
let retrieve_data: Item = r.get().primary(3_u32)?.unwrap();
println!("data id='3': {:?}", retrieve_data);
// Iterate items with name starting with "red"
for item in r.scan().secondary::<Item>(ItemKey::name)?.start_with("red") {
println!("data name=\"red\": {:?}", item);
}
// Remove data (open a read-write transaction)
let rw = db.rw_transaction()?;
rw.remove(retrieve_data)?;
rw.commit()?;
Ok(())
}