在Android中将MDB转换为SQLite,您可以按照以下步骤操作:
首先,您需要确保已经安装了以下工具:
使用SQLite Manager,您可以将MDB文件转换为SQLite文件。以下是步骤:
在Android应用程序中使用SQLite文件,您需要执行以下操作:
以下是一个示例代码,用于在Android应用程序中使用SQLite数据库:
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "my_database.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "my_table";
private static final String COLUMN_ID = "id";
private static final String COLUMN_NAME = "name";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// Copy database from assets folder to writable directory
copyDatabaseFromAssets(context);
}
private void copyDatabaseFromAssets(Context context) {
InputStream inputStream = null;
OutputStream outputStream = null;
try {
inputStream = context.getAssets().open(DATABASE_NAME);
File outputFile = context.getDatabasePath(DATABASE_NAME);
outputStream = new FileOutputStream(outputFile);
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
outputStream.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (" +
COLUMN_ID + " INTEGER PRIMARY KEY, " +
COLUMN_NAME + " TEXT)";
db.execSQL(createTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String dropTable = "DROP TABLE IF EXISTS " + TABLE_NAME;
db.execSQL(dropTable);
onCreate(db);
}
public void addData(String name) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COLUMN_NAME, name);
db.insert(TABLE_NAME, null, contentValues);
db.close();
}
public Cursor getData() {
SQLiteDatabase db = this.getWritableDatabase();
String query = "SELECT * FROM " + TABLE_NAME;
return db.rawQuery(query, null);
}
}
以上示例代码展示了如何在Android应用程序中使用SQLite数据库,并提供了一些基本的CRUD(创建、读取、更新、删除)操作。您可以根据自己的需求对代码进行修改和扩展。
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