4

所以我在 android 4.0 + 上测试我的代码并认为它​​可以在其他版本上正常工作时犯了一个大错误。但是我在使用 SQLiteOpenHelper 时遇到了 2.X 和 3.X 的问题。

首先是代码：

 public class HelperDB extends SQLiteOpenHelper implements BaseColumns {

 public static final int DATABASE_VERSION = 2;
 public static final String DATABASE_NAME = "MYDB.db";
 public static final String TABLE_NAME = "MYtable";
 public static final String TABLE_NAME_LOGO = "MYLogos";
 public static final String COLUMN_NAME_1 = "xxxxx";
 public static final String COLUMN_NAME_2 = "yyyy";
 public static final String COLUMN_NAME_3 = "zzzz";
 public static final String COLUMN_NAME_4 = "aaaa";
 public static final String COLUMN_NAME_LOGO = "logo";
 public static final String COLUMN_NAME_5 = "3333";
 public static final String COLUMN_NAME_6 = "fffff";
 public static final String COLUMN_NAME_7= "Abc";

public HelperDB(Context context)
{
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
 public void onCreate(SQLiteDatabase db){

    db.execSQL("CREATE TABLE " + TABLE_NAME + "(" + _ID + " INTEGER PRIMARY KEY autoincrement," + COLUMN_NAME_1 + " TEXT not null," + COLUMN_NAME_2
            + " TEXT not null," + COLUMN_NAME_3 + " TEXT not null," + COLUMN_NAME_4 + " LONG not null," + COLUMN_NAME_5 + " INT DEFAULT 99," + COLUMN_NAME_6 +" INT DEFAULT 99);");


    db.execSQL("CREATE TABLE " + TABLE_NAME_LOGO + "(" + _ID + " INTEGER PRIMARY KEY autoincrement," + COLUMN_NAME_6 + " TEXT not null,"  +  COLUMN_NAME_7 + " INTERGET not null);");

}

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

}

 }
******************************************************************************

  public class MatchesDB {

private HelperDB dbHelper;  
private SQLiteDatabase dbw, dbr; 
public static int id;

public MatchesDB(Context context){  

    dbHelper = new HelperDB(context); 
    dbw = dbHelper.getWritableDatabase();
    dbr = dbHelper.getReadableDatabase();
}

public void fillinfotable(){}
And all other functions to query the database and delete etc

通过调用创建数据库

      MatchesDB newdb = new MatchesDB(context);
  newdb.fillinfotable();

所有这一切都在所有 4.0 + 设备上完美运行。但是，当我尝试在 2.x 设备上运行时出现以下错误

07-14 21:29:14.890: E/Database(22231): CREATE TABLE android_metadata failed
07-14 21:29:14.898: E/Database(22231): CREATE TABLE android_metadata failed
07-14 21:29:15.640: E/Database(22231): Failed to setLocale() when constructing, closing      the database
07-14 21:29:15.640: E/Database(22231): android.database.sqlite.SQLiteException:  database is locked
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
07-14 21:29:15.640: E/Database(22231):  at   android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:2000)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase. <init>(SQLiteDatabase.java:1857)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:822)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:856)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:849)
07-14 21:29:15.640: E/Database(22231):  at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:556)
07-14 21:29:15.640: E/Database(22231):  at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
07-14 21:29:15.640: E/Database(22231):  at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)

任何帮助都非常感谢！真的想要快速修复，因为该应用程序已经在 Play 商店中，我需要发布更新

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2 回答 2

0

The issue was that i was doing these database operations from a widget using asyntasks. While this works perfectly on android 4.0 + devices, however for lesser versions of android i had to first create an activity and do all the database creation and filling up of tables in the application and then have the widget retrieve and display that data.

于 2013-10-22T10:16:33.420 回答
0

不确定这是否是一种“最佳实践”，但在我的应用程序中，我从不保持数据库打开。我几乎在每个 CRUD 操作之前/之后打开和关闭它。它适用于 Android 2.2。

于 2013-07-29T11:04:10.573 回答