如何自动计算 INSERTET DATE - 当前日期答案

【问题标题】：How to automatically calculate INSERTET DATE - current date如何自动计算 INSERTET DATE - 当前日期
【发布时间】：2021-12-04 22:42:16
【问题描述】：

我有一张桌子：

CREATE TABLE IF NOT EXISTS bands (
   id serial PRIMARY KEY,
   name VARCHAR UNIQUE NOT NULL,
   creationDate DATE not NULL,
   years  DATE not NULL
);

我只想通过name 和creation date。我想要的是years 将返回currentdate - creationDate。问题是我真的不知道我应该在哪里正确更改我的代码，因为我使用的是Node project。我的代码如下所示：

const express = require("express");
const app = express();
const pool = require("./db");

app.use(express.json());
// Routes

app.post("/bands", async (req, res) => {
  try {
    const { name, creationDate } = req.body;
    const newBand = await pool.query(
      "INSERT INTO bands (name, creationDate,years) VALUES ($1, $2) RETURNING *",
      [name, creationDate]
    );
    res.json(newBand);
  } catch (err) {
    console.error(err.message);
  }
});

app.get("/bands", async (req, res) => {
  try {
    const allBands = await pool.query("SELECT * FROM bands");
    res.json(allBands);
    console.log(allBands);
  } catch (err) {
    console.error(err.message);
  }
});
app.get("/bands/:bandsName", async (req, res) => {
  console.log(req.params);
  const { bandsName } = req.params;
  try {
    const todo = await pool.query("SELECT * FROM bands WHERE name = $1", [
      bandsName,
    ]);
    res.json(todo.rows[0]);
  } catch (err) {
    console.error(err.message);
  }
});

app.put("/bands/:id", async (req, res) => {
  try {
    const { id } = req.params;
    const { name, creationDate } = req.body;
    const updateTodo = await pool.query(
      "UPDATE band SET name = $1,  creationDate = $2 WHERE id = $3",
      [name, creationDate, id]
    );
    res.json("Udało się, zaaktualizowane");
  } catch (err) {
    console.error(err.message);
  }
});
app.delete("/bands/:id", async (req, res) => {
  try {
    const { id } = req.params;
    const deleteTodo = await pool.query("DELETE FROM bands WHERE id = $1", [
      id,
    ]);
    res.json("Usunięto");
  } catch (err) {
    console.error(err.message);
  }
});

app.listen(3000, () => {
  console.log("server is listening on port 3000");
});

谁能告诉我应该在哪里更改我的代码，以便"years" 将自动计算而无需我将数据放入邮递员？

【问题讨论】：

标签： javascript sql postgresql api postman

【解决方案1】：

const { name, creationDate } = req.body; 
const d = new Date(creationDate );
const year = d.getFullYear();

创建一个日期对象并检索年份就可以了

【讨论】：