useeffect database example in typescript

index.ts
import { useEffect, useState } from "react";
import { fetchDataFromDatabase } from "./api"; // example API function to fetch data from the database

const Component = () => {
  const [data, setData] = useState([]);

  useEffect(() => {
    const fetchData = async () => {
      try {
        const result = await fetchDataFromDatabase();
        setData(result);
      } catch (error) {
        console.error("Error fetching data from database: ", error);
      }
    };

    fetchData();
  }, []);

  return (
    <div>
      {data.map((item) => (
        <div key={item.id}>{item.name}</div>
      ))}
    </div>
  );
};
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In the code snippet above:

• We import useEffect and useState from react.
• We define a functional component Component.
• Inside the component, we define a state variable data and a function setData using useState which will hold the fetched data from the database.
• We use useEffect to fetch data from the database when the component mounts.
• We call an async function fetchData within the useEffect to fetch data asynchronously from the database using an imaginary fetchDataFromDatabase API function.
• When the data is fetched successfully, we update the state variable data using setData.
• We display the fetched data in the component.

Remember to replace fetchDataFromDatabase and the sample data structure with actual functions and model types relevant to your database implementation.