SQLite with expo-sqlite in React Native - UI Render Trace

Component - SQLite with expo-sqlite

This component shows how to use SQLite database in a React Native app using the expo-sqlite library. It opens a database, creates a table, inserts a record, and displays stored data on the screen.

Widget Tree

View
├─ Text (Title)
├─ Button (Add Item)
└─ FlatList (Data List)
   └─ Text (List Item)

The root View contains a Text widget showing the title, a Button to add new data, and a FlatList that renders each database record as a Text item in a scrollable list.

Render Trace - 5 Steps

Step 1: View

Step 2: Text

Step 3: Button

Step 4: FlatList

Step 5: Text (inside FlatList)

State Change - Re-render

Trigger:User presses 'Add Item' button

Before

itemsArray contains current database records

→

After

itemsArray updated with new record inserted into SQLite database

Re-renders:FlatList and its child Text items re-render to show updated list

UI Quiz - 3 Questions

What happens when the 'Add Item' button is pressed?

A The app navigates to a new screen

B A new record is inserted into the SQLite database and the list updates

C The title text changes

D The app closes

Key Insight

Using expo-sqlite in React Native lets you store data locally on the device. The UI updates by reading from the database and re-rendering lists. Keeping the database logic separate from UI components helps maintain clear code and smooth user experience.