安卓java层操作数据库

二、JAVA代码

//1定义：
    private final String DATABASE_PATH = "/data/data/com.android.providers.settings/databases";   
    private final String DATABASE_FILENAME = "settings.db";   
    SQLiteDatabase database; 

//2打开数据库：
    private SQLiteDatabase openDatabase() {   
        try {   
            // 获得dictionary.db文件的绝对路径   
            String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME;   
            File dir = new File(DATABASE_PATH);   
            // 打开/sdcard/dictionary目录中的dictionary.db文件   
            SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(   
                    databaseFilename, null);   
            return database;   
        } catch (Exception e) {   
        }   
        return null;   
    }   
	
//3查询数据库：	
		System.out.println("*****************************select********************************");
		database = openDatabase();
		String name = null;
		Cursor cs=database.rawQuery("select * from secure where name=\"udp_url\"", null);
        //打印第三列参数值
        while(cs.moveToNext()){
         name = cs.getString(2);
         System.out.println(name);
        }
        cs.close();
        database.close();
        System.out.println("******************************select*******************************");

//4更新数据库：
		System.out.println("****************************update*********************************");
        database = openDatabase();
        Cursor cs=database.rawQuery("update secure set value =\""+ str + "\" where name='udp_url'", null);
        while(cs.moveToNext()){
            String name = cs.getString(2);
            System.out.println(name);
            }
        cs.close();
        database.close();
        System.out.println("****************************update*********************************");
		</span>

安卓java层操作数据库

原文：http://blog.csdn.net/hearbeat/article/details/51355619