Question

我有一个名为cv的ContentValues []数组，它进入我的SQLite数据库。为了保持简单，我的数据库有这3列（每行，日和湿度的自动增加ID）。数据库有3行。以下是添加到单行的数据示例。

#Importing all Maya commands to Python
import maya.cmds as cmds
from functools import partial

class CreateUI():
    def __init__(self):
        windowID = "myWindowID"

        if cmds.window(windowID, exists=True):
            cmds.deleteUI(windowID)

#-----------------------------------------------Layout of Interface 

        masterWindow = cmds.window(windowID, title="User Interface", w=500, h=800, sizeable=False, resizeToFitChildren=True)
        ShapeLayout = cmds.rowColumnLayout(parent=masterWindow, numberOfColumns=1, columnOffset=[(2,"left",0)])



#-----------------------------------------------Shape Functions       

#Functions for creating shapes        
        def mySphere(*args):
            cmds.polySphere()

        def myCube(*args):
            cmds.polyCube()

        def myCylinder(*args):
            cmds.polyCylinder()

        def myCone(*args):
            cmds.polyCone()

        def myTorus(*args):
            cmds.polyTorus()

        def myPlane(*args):
            cmds.polyPlane()

        def myDelete(*args):
            cmds.select()
            cmds.delete()

#Gets rid of any shapes in the scene so that the user doesn't have to every time the UI is launched or the sript is run
        ShapeList = cmds.ls("mySphere*", "myCube*", "myCylinder*", "myCone*", "myTorus*", "myPlane*","pSphere*", "pCube*", "pCylinder*", "pCone*", "pTorus*", "pPlane*")
        if len(ShapeList)>0:
            cmds.delete(ShapeList)

#-----------------------------------------------Shape Buttons         

#Buttons for creating shapes    
        cmds.button(label="Sphere", command=mySphere)
        cmds.button(label="Cube", command=myCube)
        cmds.button(label="Cylinder", command=myCylinder)
        cmds.button(label="Cone", command=myCone)
        cmds.button(label="Torus", command=myTorus)
        cmds.button(label="Plane", command=myPlane)
        cmds.button(label="Delete", command=myDelete)

        #COLOUR
        cmds.separator(h=20, style="none")
        cmds.colorSliderGrp('blockColour',label="Colour", hsv=(120, 1, 1))
        cmds.separator(h=20, style="none")

        #TRANSLATE
        TranslateX = cmds.intSliderGrp('TX',label="Translate X ", field=True, min=1, max=100, value=0)  
        TranslateY = cmds.intSliderGrp('TY',label="Translate Y ", field=True, min=1, max=100, value=0)
        TranslateZ = cmds.intSliderGrp('TZ',label="Translate Z ", field=True, min=1, max=100, value=0)
        cmds.separator(h=20, style="none")

        #ROTATE
        RotateX = cmds.intSliderGrp('RX',label="Rotate X ", field=True, min=1, max=100, value=0)  
        RotateY = cmds.intSliderGrp('RY',label="Rotate Y ", field=True, min=1, max=100, value=0)
        RotateZ = cmds.intSliderGrp('RZ',label="Rotate Z ", field=True, min=1, max=100, value=0)
        cmds.separator(h=20, style="none")

        #SCALE
        ScaleX = cmds.intSliderGrp('SX',label="Scale X ", field=True, min=1, max=100, value=0)  
        ScaleY = cmds.intSliderGrp('SY',label="Scale Y ", field=True, min=1, max=100, value=0)
        ScaleZ = cmds.intSliderGrp('SZ',label="Scale Z ", field=True, min=1, max=100, value=0)



        cmds.showWindow(windowID)
ui=CreateUI()

这循环3次，每次ContentValue都放入我的ContentValue数组中，然后批量插入到我的数据库中。

我有一个Job每隔五分钟从服务器获取一次新数据。所以我需要这些新数据来替换旧数据并且遇到语法问题。我直到我有ContentValues [] jsonResults与新数据，然后有点困惑。如何更新表格中的所有行？我是否需要遍历contentResolvers更新方法：

ContentValues cv = new ContentValues();
        cv.put(WeatherContract.WeatherData.COLUMN_DAY_OF_WEEK, day);
        cv.put(WeatherContract.WeatherData.COLUMN_HUMIDITY, humidity);

如果是这样，我在我的where和selectionArgs子句中放置什么而不是null？或者我把它保持为空？

在浏览ContentProvider之后，这是我实际插入的数据库方法：

for (int i =0; i<jsonResults.length;i++){
            context.getContentResolver().update(weatherQueryUri,jsonResults[i],null,null);
        }

谢谢！

Answer 1

嗯，我不太确定我的解决方案是否运作良好，但你可以尝试一下。为了用新的数据替换旧数据，我首先在ContentResolver对象上执行delete（）然后执行bulkInsert（）。这样你就不必循环通过jsonResults。

  if (jsonResults != null && jsonResults.length != 0) {
                /* Get a ContentResolver object to help delete and insert data */
                ContentResolver contentResolver = context.getContentResolver();

                /* Delete old data */
                contentResolver.delete(weatherQueryUri,null,null);

                /* Insert our new data into contentResolver */
                contentResolver.bulkInsert(weatherQueryUri, jsonResults);
            }

内容提供商 - 更新所有行和列

1 个答案: