cassandra “原始”参数必须是Function类型

y0u0uwnf  于 2022-11-05  发布在  Cassandra
关注(0)|答案(1)|浏览(161)

我是新的React Native,并试图连接数据库与我的程序。我得到这个错误,我不知道该如何尝试修复它...

TypeError: The "original" argument must be of type Function

Profil
src/jsoni/Profil.js:4

  1 | import React from 'react';
  2 | import { StyleSheet, SafeAreaView,TouchableOpacity,Text} from 'react-native';
  3 | 
> 4 | export default function Profil({navigation}) {
  5 | 
  6 | 
  7 |   const { Client } = require("cassandra-driver");

......而这个......

Unhandled Rejection (TypeError): Client is not a constructor

registerRootComponent
src/launch/registerRootComponent.web.tsx:14

  11 |   const RootComponent: React.FC<P> = props => <App {...props} />;
  12 |   AppRegistry.registerComponent('main', () => RootComponent);
  13 |   const rootTag = document.getElementById('root') ?? document.getElementById('main');
> 14 |   AppRegistry.runApplication('main', { rootTag });
  15 | }
  16 |

我正在使用DataStax Astra数据库,下面是我尝试做的https://docs.datastax.com/en/astra/docs/connecting-to-your-database-with-the-datastax-nodejs-driver.html
这是我的密码...

import React from 'react';
import { StyleSheet, SafeAreaView,TouchableOpacity,Text} from 'react-native';

export default function Profil({navigation}) {

  const { Client } = require("cassandra-driver");
  async function run() {
    const client = new Client({
      cloud: {
        secureConnectBundle: "../../secure-connect-test.zip",
      },
      credentials: {
        username: "myusername",
        password: "mypassword",
      },
    });
    await client.connect();

    // Execute a query
    const rs = await client.execute("SELECT firstname FROM keyspace.table");
    console.log(rs.rows);
    await client.shutdown();
  }

  // Run the async function
  run();
  const press = () => {
    navigation.navigate('Home');
  }
  return (
  <TouchableOpacity onPress={press}>
      <SafeAreaView>
          <SafeAreaView style={styles.border}/>
          <Text>Text here</Text>
      </SafeAreaView>
  </TouchableOpacity>
  );
}
const styles = StyleSheet.create({
  border: {
    height: 50,
    width:100,
    backgroundColor:'#ff69ff',
  },
});
deikduxw

deikduxw1#

请尝试在文件顶部进行常规导入,而不要使用require将客户端导入组件中:

// Remove this line
const { Client } = require("cassandra-driver");

// and import at the top of the file =>

import React from 'react';
import { ... } from 'react-native';
import { Client } from 'cassandra-driver';

编辑:看起来Cassandra Driver是一个在节点后端使用的工具,所以这个插件可能在React-Native中不起作用。所以你必须在节点中设置一个后端,然后从那里获取ReactNaive中的结果。

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