null 不是对象 Sqlite + ReactNative expo Typescript

Question

我制作了登录页面，现在我正在尝试将简单的 user.js 替换为 Sqlite 数据库（react-native-sqlite-storage）。当我使用数据库启动我的项目时，出现此错误。

我的代码

import {openDatabase} from 'react-native-sqlite-storage';
var db = openDatabase({name : 'UserDatabase.db'});
const SignInScreen = ({navigation}) => {
const [userName, setuserName] = useState();
const [userContact, setuserContact] = useState();
const [userAddress, setuserAddress] = useState();
let register_user = () =>
{
    console.log(userName, userContact, userAddress);
db.transaction(function(tx)
{
    tx.executeSql(
        'INSERT INTO table_user(user_name, user_name, user_password) VALUES(?, ?,?)',
    [userName, userContact, userAddress],
    (tx, result) =>
    {console.log('Result', result.rowAffected);
    if (result.rowAffected > 0)
    {
    onPress: () => navigation.navigate('HomeScreen')
    }
    }
        )
})}
//And Button
  <TouchableOpacity
  style={styles.signIn}
  onPress={() => {register_user}}
            >
                
    <Text> Check //Here linegradient 1)</Text>
         
    </TouchableOpacity>

Answer 1

问题在于在单独的文件中创建连接（必须在 App 中创建）。

null 不是对象 Sqlite + ReactNative expo Typescript

null is not an object Sqlite + ReactNative expo Typescript

database

sqlite

react-native

expo