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将现有的 sqllite 数据库放在 android 文件夹结构中的什么位置？它是可绘制文件夹还是布局文件夹？

我没有找到任何解决方案。

任何帮助将不胜感激。

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5 回答 5

2

你应该把它放在assets文件夹里。这样，您可以确保它将附加到您的 apk。这是将数据库文件从资产文件夹复制到工作目录的方法：

private void copyDataBase() throws IOException{

//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);

// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;

//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);

//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}

//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();

}

现在从目录中读取数据库：

 public void openDataBase() throws SQLException{

//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

}
于 2013-08-09T09:45:04.143 回答
1

正如名称应指示drawable或layout不用于数据库。如果您想将预设数据库与您的应用程序一起分发，那么它与您放置它的位置无关（除了当您尝试将其放入时，drawable否则layout您将无法构建您的应用程序）。最理智的地方是assets文件夹。并且有一个非常好的助手可以帮助您完成设置此类数据库以与应用程序一起使用的任务：https ://github.com/jgilfelt/android-sqlite-asset-helper

于 2013-08-09T09:53:53.873 回答
0

你应该把你的外部数据库文件放在assets文件夹中：

然后为它创建一个类。

package com.appgiudeextra.Database;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

import com.appguideextra.Items.MasterItem;

public class DBConnect extends SQLiteOpenHelper {
 public int GetCursor;
// ****************** Declare all the global variable
// ****************************//
 private Context myContext;
 public String DB_PATH = "data/data/com.appguideextra/databases/"; // path
// of
// your
// datbase
 public static String DB_NAME = "AppGuide.sqlite";// your database name
 static String ASSETS_DB_FOLDER = "db";
 private SQLiteDatabase db;

 public DBConnect(Context context, String db_name) {
    super(context, db_name, null, 2);
    if (db != null && db.isOpen())
        close();

    this.myContext = context;
    DB_NAME = db_name;

    try {
        createDataBase();
        openDataBase();
    } catch (IOException e) {
        // System.out.println("Exception in creation of database : "+
        // e.getMessage());
        e.printStackTrace();
    }

}

public void createDataBase() throws IOException {
    boolean dbExist = checkDataBase();

    if (dbExist) {
        // System.out.println("Database Exist");
    } else {
        this.getReadableDatabase();

        try {
            copyDatabase();
        } catch (IOException e) {
            throw new Error("Error copying database");
        }
    }
}

private void copyDatabase() throws IOException {
    InputStream input = myContext.getAssets().open(DB_NAME);
    String outputFileName = DB_PATH + DB_NAME;
    OutputStream output = new FileOutputStream(outputFileName);

    byte[] buffer = new byte[1024];
    int length;
    while ((length = input.read(buffer)) > 0) {
        output.write(buffer, 0, length);
    }

    // Close the streams
    output.flush();
    output.close();
    input.close();
    // System.out.println(DB_NAME + "Database Copied !");
}

@Override
public void onCreate(SQLiteDatabase db) {

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

public void openDataBase() throws SQLException {
    // Open the database
    String myPath = DB_PATH + DB_NAME;
    db = SQLiteDatabase.openDatabase(myPath, null,
            SQLiteDatabase.OPEN_READWRITE);
}

public boolean isOpen() {
    if (db != null)
        return db.isOpen();
    return false;
}

@Override
public synchronized void close() {
    if (db != null)
        db.close();
    super.close();
}

private boolean checkDataBase() {
    SQLiteDatabase checkDB = null;
    try {
        String myPath = DB_PATH + DB_NAME;
        // System.out.println("My Pathe is:- " + myPath);
        // System.out.println("Open");
        checkDB = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READWRITE);
        // System.out.println("checkDB value:" + checkDB);
        // System.out.println("My Pathe is:- " + myPath);
    } catch (Exception e) {
        // database does't exist yet.
    }

    if (checkDB != null) {
        // System.out.println("Closed");
        checkDB.close();
        // System.out.println("My db is:- " + checkDB.isOpen());
    }

    return checkDB != null ? true : false;
}

public Cursor execCursorQuery(String sql) {
    Cursor cursor = null;
    try {
        cursor = db.rawQuery(sql, null);
        GetCursor = cursor.getCount();
        Log.i("Inside execCursorQuery try", sql);
    } catch (Exception e) {
        Log.i("Inside execCursorQuery exception", e.getMessage());
    }
    return cursor;
}

public void execNonQuery(String sql) {
    try {
        db.execSQL(sql);
        // Log.d("SQL", sql);
    } catch (Exception e) {
        // Log.e("Err", e.getMessage());
    } finally {
        // closeDb();
    }
}}
于 2013-08-09T09:50:05.297 回答
0

路径：数据 -> 数据 -> com.yourcompany.yourappid -> 数据库，或者您可以使用 Astro File Manager 应用程序在您的设备上查找数据库并浏览您的设备文件夹结构。

此代码介绍了如何在您的设备上找到 sql 的 DB 文件：

var dbName = 'dbData';
var dbPath;
var dbFile;
if ( Ti.Platform.osname == 'android' ) {
    dbPath = 'file:///data/data/' + Ti.App.getID() + '/databases/';
    dbFile = Ti.Filesystem.getFile( dbPath + dbName ); 
}
else {
    dbPath = Ti.Filesystem.applicationSupportDirectory + '/database/';
    dbFile = Ti.Filesystem.getFile( dbPath + dbName + '.sql' );
}
于 2013-08-09T09:40:37.757 回答
0

我个人将 sqllite 数据库放在 assets 文件夹中。为了使用它，您可以将其复制到“/data/data/your.application.package.name/databases/

于 2013-08-09T09:46:01.947 回答