React Native liest die lokale SQLite-Pfadkonfiguration

Question

import React from 'react';
import SQLiteStorage from 'react-native-sqlite-storage';

SQLiteStorage.DEBUG(true);
var database_name = "promo.db";
var database_version = "1.0";
var database_displayname = "MySQLite";
var database_size = -1;
var db;
const Product_TABLE_NAME = "Product";//收藏表

const SQLite = React.createClass({

    render(){
        return null;
    },
    componentWillUnmount(){
        if(db){
            this._successCB('close');
            db.close();
        }else {
            console.log("SQLiteStorage not open");
        }
    },
    open(){
        db = SQLiteStorage.openDatabase(
            database_name,
            database_version,
            database_displayname,
            database_size,
            ()=>{
                this._successCB('open');
            },
            (err)=>{
                this._errorCB('open',err);
            });
    },
    createTable(){
        if (!db) {
            open();
        }
        //创建表
        db.transaction((tx)=> {
            tx.executeSql('CREATE TABLE IF NOT EXISTS ' + Product_TABLE_NAME + '(' +
                'id INTEGER PRIMARY KEY NOT NULL,' +
                'name VARCHAR,' +
                'jan VARCHAR,' +
                'price VARCHAR,' +
                'img VARCHAR,' +
                'url VARCHAR,' +
                'title VARCHAR'
                + ');'
                , [], ()=> {
                    this._successCB('executeSql');
                }, (err)=> {
                    this._errorCB('executeSql', err);
                });
        }, (err)=> {
            this._errorCB('transaction', err);
        }, ()=> {
            this._successCB('transaction');
        })
    },
    close(){
        if(db){
            this._successCB('close');
            db.close();
        }else {
            console.log("SQLiteStorage not open");
        }
        db = null;
    },
    _successCB(name){
        console.log("SQLiteStorage "+name+" success");
    },
    _errorCB(name, err){
        console.log("SQLiteStorage "+name+" error:"+err);
    }
});

module.exports = SQLite;

Wie kann ich den Pfad der Datenbank so konfigurieren, dass ich die lokale sqlite.db auf dem mobilen Endgerät lesen kann, ohne jedes Mal eine neue zu erstellen?

Answer 1

没人回答自己回答了~
在外部组件react-native-sqlite-storage 中，源码支持读写SD卡 ，所以直接写路径就ok

import React,{Component} from 'react';
import{
    ToastAndroid,
} from 'react-native';
import SQLiteStorage from 'react-native-sqlite-storage';
SQLiteStorage.DEBUG(true);
var database_name = "/sdcard/TabletPromo/Promo.db";//数据库文件
var database_version = "1.0";//版本号  
var database_displayname = "MySQLite";
var database_size = -1;//-1应该是表示无限制  
var db;
class SQLite extends Component {
    componentWillUnmount(){
        if(db){
            this._successCB('close');
            db.close();
        }else {
            console.log("SQLiteStorage not open");
        }
    }
    open(){
        db = SQLiteStorage.openDatabase(
            database_name,
            database_version,
            database_displayname,
            database_size,
            ()=>{
                this._successCB('open');
            },
            (err)=>{
                this._errorCB('open',err);
            });
        return db;
    }
    close(){
        if(db){
            this._successCB('close');
            db.close();
        }else {
            console.log("SQLiteStorage not open");
        }
        db = null;
    }
    _successCB(name){
        console.log("SQLiteStorage "+name+" success");
    }
    _errorCB(name, err){
        console.log("SQLiteStorage "+name);
        console.log(err);
    }
    render(){
        return null;
    }
};

export default SQLite;

文件在移动端的位置如图：

继续研究怎样动态读取数据，欢迎讨论