enviar_data.js

import React, { Component } from 'react';
import { StyleSheet, Text, View, Button, Image, TextInput, ScrollView, Alert } from 'react-native';
import {List, ListItem, Col, Row} from 'native-base'
import { FontAwesome, AntDesign, Ionicons, MaterialIcons } from '@expo/vector-icons';
import * as SQLite from 'expo-sqlite';

const db = SQLite.openDatabase('aalmarketapp.db');

export default class AppMarket extends Component {
    constructor(props) {
      super(props);
      this.state = {
        dataTodo : []
      };
    }


    fetchData(search){
      var query = "SELECT * FROM productos WHERE cod='" + search + "'";
      var params = [];
      db.transaction((tx) => {
          tx.executeSql(query, params, (tx,results) => {

            for (var i=0; i < results.rows._array.length; i++) {

                let cod = results.rows.item(i).cod;
                let descripcion = results.rows.item(i).descripcion;
                let detalles = results.rows.item(i).detalles;
                let precio = results.rows.item(i).precio;
                let otros = results.rows.item(i).otros;
                let card_front = results.rows.item(i).card_front;
                let card_back = results.rows.item(i).card_back;

                this.registerData(cod,descripcion,detalles,precio,otros,card_front,card_back);
                Alert.alert(String(results.rows._array.length));

            }

          }, function(tx, err){
              Alert.alert("welcome");
          });
      });
      Alert.alert("Exito","Datos enviado Exitosamente...!")
    }

    registerData = async (cod_producto,descripcion,detalles,precio,otros,card_front,card_back) => {
      let base_url = 'http://192.168.0.5/react/data.php'
      let uploadData = new FormData();
      uploadData.append('submit','ok');
      uploadData.append('cod_producto',cod_producto);
      uploadData.append('descripcion',descripcion);
      uploadData.append('detalles',detalles);
      uploadData.append('precio',precio);
      uploadData.append('otros',otros);
      uploadData.append('card_front',card_front);
      uploadData.append('card_back',card_back);
      fetch(base_url,{
        method:'post',
        body:uploadData
      }).then(response => response.json())
      .then(response => {
        if(response.status){
        /*Alert.alert('Exito',response.message);*/
        }else{
          Alert.alert('Error',response.message);
        }
      }).catch(()=>{
        Alert.alert('Error','Error on network');
      })


    }

    ExistImg(url){
      fetch(url)
         .then(res => {
         if(res.status == 404){
          Alert.alert('Error','Imagen No Encontrada');
         }else{
          Alert.alert('Exito','Imagen Encontrada');
        }
      })
     .catch(err=>{Alert.alert('Error','Error en Conexion');})
     }

    render() {

        return (
            <View>
                <Text>Enviar Data</Text>
                <Button rounded success type="outline" title="Enviar Registros" onPress={() => {this.fetchData('wap')}}/>
                <Button rounded success type="outline" title="Verificar Existencia" onPress={() => {this.ExistImg('https://tucancountryclub.com/es/wp-content/uploads/2019/06/Nuevo-logo-Tucan-250x300.png')}}/>
            </View>
            );
    }
}