file_sql/
editor.rs

1//! 实现修改数据功能 trait
2
3use std::fmt::Display;
4
5use crate::{App, AppData, FQLType};
6
7pub trait Editor {
8    fn add(&mut self, new_data: AppData);
9    fn remove(&mut self, index: usize);
10    fn insert(&mut self, index: usize, new_data: AppData);
11    fn replace(&mut self, index: usize, new_data: AppData);
12    fn update<T: Display>(&mut self, index: usize, key: T, new_value: FQLType);
13}
14
15impl Editor for App {
16    /// 修改一行数据
17    /// #Example
18    ///```
19    /// use file_sql::*;
20    /// let app = App::from_file("example.fql");
21    /// let new_data = app.find_index(1);
22    /// app.replace(0, "age", new_data.to_owned());
23    ///```
24    fn replace(&mut self, index: usize, new_data: AppData) {
25        self.data.remove(index);
26        self.data.insert(index, new_data);
27    }
28
29    /// 在指定一行加入数据  
30    fn insert(&mut self, index: usize, new_data: AppData) {
31        self.data.insert(index, new_data);
32    }
33
34    /// 删除某一列数据
35    /// #Example
36    ///```
37    /// use file_sql::*;
38    /// let app = App::from_file("example.fql");
39    /// app.remove(1); // 删除第二行数据
40    ///```
41    fn remove(&mut self, index: usize) {
42        self.data.remove(index);
43    }
44
45    fn update<T: Display>(&mut self, index: usize, key: T, new_value: FQLType) {
46        let mut new_data = self.data.remove(index);
47        new_data.insert(key.to_string(), new_value);
48        self.data.insert(index, new_data);
49    }
50
51    /// 添加数据到末尾
52    fn add(&mut self, new_data: AppData) {
53        self.data.push(new_data);
54    }
55}
file_sql/editor.rs

file_sql/
editor.rs
