问题描述

我有一个 libgdx 项目 (Android)，我在其中使用 sqlite 数据库.我正在 iOS 版本 (robovm) 中开发相同的项目，但我找不到任何关于 iOS 版本的 sqlite 或数据库的信息.

I have a libgdx project (Android) where I use a sqlite database. I'm developing the same project in iOS version (robovm) and I can't find anything about sqlite or database for iOS version.

是否可以使用同一个sqlite数据库?

Is it possible to use the same sqlite database ?

谢谢.

推荐答案

我知道这是一个旧线程，但这对我有用

I know this is an old thread but this worked for me

当然，你不必完全这样做，但我就是这样做的

You dont have to do it EXACTLY like this of course, but this is how i did it

首先我为 SQLite 创建了一个辅助类，名为.. SQLiteHelper这将初始化事物

First i made a helper class for SQLite called.. SQLiteHelper This would initialize things

package com.hamzahrmalik.mitto.sqlite;

import java.io.File;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import SQLite.JDBCDriver;

import com.hamzahrmalik.mitto.utils.Util;

public class SQLiteHelper {

    private String DATABASE_NAME;
    private JDBCDriver driv;
    private Connection connection;

    final String DB_PATH = new File(System.getenv("HOME"), "Library/")
            .getAbsolutePath();

    public SQLiteHelper(String DATABASE_NAME) {
        this.DATABASE_NAME = DATABASE_NAME;
        driv = new JDBCDriver();
        try {
            connection = driv.connect("sqlite:/" + DB_PATH + this.DATABASE_NAME, null);
        } catch (SQLException e) {
        }
    }

    public void execUpdate(String sql) {
        Util.log("Running SQL " + sql);
        try {
            Statement statement = connection.createStatement();
            statement.executeUpdate(sql);
            //connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public ResultSet execQuery(String query) {
        Util.log("Running SQL query " + query);
        try {
            Statement statement = connection.createStatement();
            ResultSet rs = statement.executeQuery(query);
            return rs;
        } catch (SQLException e) {
            return null;
        }
    }

}

然后每个数据库扩展这个类例如，我有一个消息数据库

Then each database extends this class For example, i have a database of Messages

我创建了一个 SQLiteMessages 类，它扩展了我创建的 Helper 类

I make a SQLiteMessages class which extends my Helper class i made

然后在构造函数中创建表格

Then in the constructor i make the table

final String CREATE_MESSAGES_TABLE = "CREATE TABLE IF NOT EXISTS "
                + this.phonenum + "(" + KEY_ID
                + " INTEGER PRIMARY KEY NOT NULL," + KEY_MESSAGE + " TEXT,"
                + KEY_FROM + " TEXT," + KEY_TO + " TEXT," + KEY_DATE + " TEXT,"
                + KEY_STATUS + " INTEGER)";

        execUpdate(CREATE_MESSAGES_TABLE);

那么当我可以在 SQL 中正常添加、删除和更新时

Then when i can add and delete and update as normal in SQL

public void addMessage(Message m) {
        final String ADD_MESSAGES = "INSERT into " + phonenum + " VALUES('"
                + m.getId() + "','" + m.getMessage() + "', '" + m.getSender()
                + "', '" + m.getRecipient() + "', '"
                + Util.formatDate(m.getTime()) + "', '" + m.getStatus()
                + "')";
        execUpdate(ADD_MESSAGES);
    }

显然您需要有一个 Message 对象，但这与问题无关

Obviously you need to have a Message object but thats not really related to question

简单地检索数据:

public Message getMessage(int id) {
        ResultSet rs = execQuery("SELECT * FROM " + phonenum + " WHERE "
                + KEY_ID + " = " + String.valueOf(id));
        try {
            if (rs.next()) {
                Message m = messageFromResult(rs);
                return m;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

public Message messageFromResult(ResultSet rs) {
        try {
            return new Message(rs.getInt(KEY_ID), rs.getString(KEY_MESSAGE),
                    rs.getString(KEY_FROM), rs.getString(KEY_TO),
                    Util.parseDate(rs.getString(KEY_DATE)),
                    rs.getInt(KEY_STATUS));
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

不需要任何外部库请记住将其添加到您的 robovm.xml

No external libraries are needed for this Remember to add this to your robovm.xml

<forceLinkClasses>
    <pattern>SQLite.**</pattern>
</forceLinkClasses>

这篇关于使用带有 libgdx 的 iOS 的 sqlite 数据库(robovm)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！