使用带有libgdx的iOS（robovm）sqlite数据库 [英] Use sqlite database for iOS (robovm) with libgdx

问题描述

我有一个 libgdx 项目（Android），我使用 sqlite数据库。
我正在 iOS 版本（robovm）中开发相同的项目，我找不到关于iOS版本的sqlite或数据库的任何内容。

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.

是否可以使用相同的sqlite数据库？

Is it possible to use the same sqlite database ?

谢谢。

推荐答案

我知道这是一个老线程，但这对我有用

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

你不必这样做当然这样，但这就是我的方式做了

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

首先我为SQLite做了一个帮助类叫做.. SQLiteHelper
这会初始化事情

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此类
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，它扩展了我制作的Helper类

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

然后在构造函数中我创建表

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);

然后我可以在SQL中正常添加，删除和更新

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);
    }

显然你需要一个Message对象，但这与问题没有关系

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;
        }
    }

这个
不需要外部库请记住将此添加到您的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（robovm）sqlite数据库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IT屋！