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修改 session.rs,严格按照如下设计思路进行: 1、DriverManager 管理全局 Driver,从 DriverManager 中的 session 方法获取到 Option; 2、不管从哪里调用session中的 begin 方法,都将事务上下文放入本地线程变量中,不管从哪里调用 session 的 execute 和 query 都可以从本地线程变量中获取事务上下文,用带事务的链接执行; 3、示例用法:

fn test() {

let session = UORM.session(&db_name).unwrap();

session.begin(); session .execute( "INSERT INTO users(name, age) VALUES (#{name}, #{age})", &NewUser { name: "alice", age: 18, }, ) .await .unwrap();

}

fn exec() { let session = UORM.session(&db_name).unwrap(); session .execute( "INSERT INTO users(name, age) VALUES (#{name}, #{age})", &NewUser { name: "bob", age: 20, }, ) .await .unwrap();

let mut rows: Vec<User> = session
    .query("SELECT id, name, age FROM users ORDER BY id", &NoArgs {})
    .await
    .unwrap();
 session.commit();

}

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