我正在做db.getVersion()来获取我的数据库的当前版本.

它在logcat中显示3.

即使在构造函数中,我设置4作为版本号.

public Helper(Context context)
    {
        super(context,DATABASE_NAME,null,4);
    }

我给4,它应该是4作为版本号.

但它的行为不如此.它显示3作为版本号.

请任何建议.

更新： –

public class Helper extends sqliteOpenHelper {
        public static final String  DATABASE_NAME = "helper.db";

        public static final String TITLE = "title";
        public static final String AUTHOR = "author";
        public static final String ISBN = "isbn";

        public Helper(Context context)
        {
            super(context,4);
        }

        @Override
        public void onCreate(sqliteDatabase db) {

                db.execsql( "CREATE TABLE book1(_id INTEGER PRIMARY KEY AUTOINCREMENT,title TEXT,author TEXT,isbn INTEGER);");
                Log.v("Create Table","CREATE TABLE book1(_id INTEGER PRIMARY KEY AUTOINCREMENT,isbn INTEGER);");

Log.v("version ","Version number is "+db.getVersion());

}