cdbc

Coroutine Database driver Connectivity.based on may

• High concurrency，based on coroutine
• No Future<'q,Output=*>，No async fn, No .await , no Poll* func，No Pin
• Optimize the trait system so that it has intelligent hints of the base method
• NativeTls and TCP connections are supported
• Low coupling，The database driver and the abstraction layer are designed separately
• Lightweight, no over-design, macro with intelligent tips
• Inspired by golang, may, sqlx

Database Support:

• cdbc The driver abstraction lib.
• cdbc-mysql CDBC mysql driver library
• cdbc-pg CDBC postgres driver library
• cdbc-sqlite CDBC sqlite driver library

Supported functions

• execute： Execute the query and return the total number of rows affected.
• execute_many： Execute multiple queries and return the rows affected from each query, in a stream.
• fetch： Execute the query and return the generated results as a stream.
• fetch_many： Execute multiple queries and return the generated results as a stream，from each query, in a stream.
• fetch_all： Execute the query and return all the generated results, collected into a [Vec].
• fetch_one： Execute the query and returns exactly one row.
• fetch_optional： Execute the query and returns at most one row.
• prepare： Prepare the SQL query to inspect the type information of its parameters and results
• prepare_with: Prepare the SQL query, with parameter type information, to inspect the type information about its parameters and results.

//prepare
let mut q = cdbc::query::query("select * from biz_activity where id = ?");
q = q.bind(1);

Supported transaction

• Pool: begin(),commit(),rollback()
• Connection: begin(),commit(),rollback()

use example:

cargo.toml

#must dep
cdbc = {version = "*"}
#optional dep
cdbc-mysql = {version = "*"}
cdbc-pg = {version = "*"}
cdbc-sqlite = {version = "*"}

• row_scan macro

use std::fs::File;
use cdbc::Executor;
use cdbc_sqlite::SqlitePool;

fn main() -> cdbc::Result<()> {
    let pool = make_sqlite()?;
    #[derive(Debug)]
    pub struct BizActivity {
        pub id: Option<String>,
        pub name: Option<String>,
        pub delete_flag: Option<i32>,
    }

    //execute
    let data = pool.acquire()?.execute("update biz_activity set delete_flag where id = \"1\"")?;
    println!("{:?}", data.rows_affected());
    
    //fetch_all
    let query = cdbc::query("select * from biz_activity where id = ?")
        .bind("1");
    let row = pool.acquire()?.fetch_all(query)?;
    let data = cdbc::row_scans!(row,BizActivity{id:None,name:None,delete_flag:None})?;
    println!("{:?}", data);
    
    //fetch_one
    let data = cdbc::row_scan!(
        cdbc::query("select * from biz_activity where id = ?")
        .bind("1")
        .fetch_one(pool)?,
        BizActivity{id:None,name:None,delete_flag:None})?;
    println!("{:?}", data);
    Ok(())
}

fn make_sqlite() -> cdbc::Result<SqlitePool> {
    //first. create sqlite dir/file
    std::fs::create_dir_all("target/db/");
    File::create("../../../target/db/sqlite.db");
    //next create table and query result
    let pool = SqlitePool::connect("sqlite://target/db/sqlite.db")?;
    let mut conn = pool.acquire()?;
    conn.execute("CREATE TABLE biz_activity(  id string, name string,age int, delete_flag int) ");
    conn.execute("INSERT INTO biz_activity (id,name,age,delete_flag) values (\"1\",\"1\",1,0)");
    Ok(pool)
}

• Processing read streams

main.rs

use std::collections::BTreeMap;
use cdbc::{Column, Decode, Executor, Row};
use cdbc::io::chan_stream::{ChanStream, TryStream};
use cdbc_sqlite::{Sqlite, SqliteRow};
use crate::make_sqlite;
#[test]
fn test_stream_sqlite() -> cdbc::Result<()> {
    //first. create sqlite dir/file
    let pool = make_sqlite().unwrap();
    //next create table and query result
    let mut conn = pool.acquire()?;
    let mut data: ChanStream<SqliteRow> = conn.fetch("select * from biz_activity;");
    data.try_for_each(|item| {
        let mut m = BTreeMap::new();
        for column in item.columns() {
            let v = item.try_get_raw(column.name())?;
            let r: Option<String> = Decode::<'_, Sqlite>::decode(v)?;
            m.insert(column.name().to_string(), r);
        }
        println!("{:?}", m);
        drop(m);
        Ok(())
    })?;
    Ok(())
}