Android 安卓数据库超过1MB
我已经编写了数据库副本。我已经将我的数据库放入asset forder。我的数据库大小为4.5 MB。 如何将数据库分块Android 安卓数据库超过1MB,android,sqlite,Android,Sqlite,我已经编写了数据库副本。我已经将我的数据库放入asset forder。我的数据库大小为4.5 MB。 如何将数据库分块 package com.xont.db; public class DataBaseMasterHelper extends SQLiteOpenHelper { // The Android's default system path of your application database. private static String DB_PATH =
package com.xont.db;
public class DataBaseMasterHelper extends SQLiteOpenHelper {
// The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.xont.controller/databases/";
private static String DB_NAME = "masterventura.db";
private SQLiteDatabase ventura;
private Context myContext;
private DataBaseHelper myDbHelper;
public DataBaseMasterHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
**/
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
//this.getReadableDatabase().getPath();
System.out.println( " ===== " + this.getReadableDatabase().getPath());
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
e.printStackTrace();
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
private void copyDataBase() throws IOException {
InputStream myInput = myContext.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0) {
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
String myPath = DB_PATH + DB_NAME;
ventura = SQLiteDatabase.openDatabase(myPath, null,SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if (ventura != null)
super.close();
ventura.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
在copyDataBase()方法中,我需要更改代码。如何拆分数据库。请在这方面帮助我
提前感谢…这里有一篇博客文章,正是您想要的:
我看到的唯一方法是在
copyDataBase()
方法中打开数据库并使用SQL语句处理数据。之后,您可以将其关闭并复制到SD卡。数据库大小可以通过抛出usless垃圾(open Database和iterfere with SQL语句)来分块。该链接对我不起作用,因此我找到了一个存档版本: