我有这样的看法: CREATE VIEW MyView AS SELECT Column FROM Table WHERE Value = 2; 我想使其更通用,这意味着将2更改为变量。我尝试了这个: CREATE VIEW MyView AS SELECT Column FROM Table WHERE Value = @MyVariable; 但是MySQL不允许这样做。 我发现了一个丑陋的解决方法: CREATE FUNCTION GetMyVariable() RETURNS INTEGER DETERMINISTIC NO SQL BEGIN RETURN @MyVariable; END| 然后视图是: CREATE VIEW MyView AS SELECT Column FROM Table WHERE …
我正在尝试在onClick(View v)XML中调用该方法,但不适用于Fragment。这是错误。 01-17 12:38:36.840: E/AndroidRuntime(4171): java.lang.IllegalStateException: Could not find a method insertIntoDb(View) in the activity class main.MainActivity for onClick handler on view class android.widget.Button with id 'btn_conferma' Java代码: public void insertIntoDb(View v) { ... } XML: <Button android:id="@id/btn_conferma" style="?android:attr/borderlessButtonStyle" android:layout_width="0.0dip" android:layout_height="45dp" android:layout_marginLeft="2dp" android:layout_weight="1.0" android:background="@drawable/bottoni" android:gravity="center_horizontal|center_vertical" android:onClick="insertIntoDb" android:text="SALVA" android:textColor="#ffffff" android:textSize="16sp" />