Question

我试图限制排名功能，但我似乎无法使其发挥作用。我错过了什么？到目前为止，我在外部查询上使用了WHERE / HAVING函数： WHERE rank＆lt; 10 但我得到的错误是没有Rank Column。

我一直在四处寻找，很多人也使用了别名。

- (void)reloadConnections{

    for (CAShapeLayer *shapelayer in self.connectionLines) {
        [shapelayer removeFromSuperlayer];
    }

    self.connectionLines = [NSMutableArray array];

    for (int i = 0; i <= (self.total-2); i++){
        NSArray *paths = [self pathForconnectionLineForIndexPath:i];
        for (UIBezierPath *path in paths) {
            UIColor *color = (self.currentLevel > i) ? [UIColor colorWithRed:0.078 green:0.557 blue:0.067 alpha:1.00] : [UIColor colorWithRed:0.957 green:0.659 blue:0.024 alpha:1.00];
            CAShapeLayer *shapelayer = [self drawdottedLineWithPath:path withborderWidth:1.0f withColor:color];
            [self.collectionView.layer addSublayer:shapelayer];
            [self.connectionLines addObject:shapelayer];
        }
    }

}

- (NSArray *)pathForconnectionLineForIndexPath:(int)index{
    NSMutableArray *paths = [NSMutableArray array];

    int row = index%self.noOfItems;
    int column = index/self.noOfItems;
    CGFloat cellWidth = self.view.frame.size.width/self.noOfItems;
    CGFloat cellHeight = self.view.frame.size.width/self.noOfItems;
    CGFloat connectionLength = cellHeight/2;

    CGFloat leftPadding;
    CGFloat topPadding;

    if (row != (self.noOfItems-1)) {
        leftPadding = cellWidth/4;
        topPadding = cellHeight/2;

        UIBezierPath *borderPath = [UIBezierPath bezierPath];
        CGFloat startX = (3*leftPadding)+(row*cellWidth);
        CGFloat startY = topPadding+(column*cellHeight);
        CGFloat endX = startX + connectionLength;
        CGFloat endY = startY;
        [borderPath moveToPoint:CGPointMake(startX , startY)];
        [borderPath addLineToPoint:CGPointMake(endX,  endY)];
        [self drawDirectionAt:CGPointMake((startX+(connectionLength/2)) , startY) isEnabled:(self.currentLevel > index) isRight:YES];
        [paths addObject:borderPath];

    }

    if ( (row == (self.noOfItems-1)) && (column%2 == 0) ) {
        leftPadding = cellWidth/2;
        topPadding = cellHeight/8;

        UIBezierPath *borderPath = [UIBezierPath bezierPath];
        CGFloat startX = leftPadding+(row*cellWidth);
        CGFloat startY = (7*topPadding)+(column*cellHeight);
        CGFloat endX = startX;
        CGFloat endY = startY + (2*topPadding);
        [borderPath moveToPoint:CGPointMake(startX , startY)];
        [borderPath addLineToPoint:CGPointMake(endX,  endY)];
        [self drawDirectionAt:CGPointMake(startX , (startY+topPadding)) isEnabled:(self.currentLevel > index) isRight:NO];
        [paths addObject:borderPath];

    }

    if ( (row == 0) && (column%2 != 0) ) {
        leftPadding = cellWidth/2;
        topPadding = cellHeight/8;

        UIBezierPath *borderPath = [UIBezierPath bezierPath];
        CGFloat startX = leftPadding+(row*cellWidth);
        CGFloat startY = (7*topPadding)+(column*cellHeight);
        CGFloat endX = startX;
        CGFloat endY = startY + (2*topPadding);
        [borderPath moveToPoint:CGPointMake(startX , startY)];
        [borderPath addLineToPoint:CGPointMake(endX,  endY)];
        [self drawDirectionAt:CGPointMake(startX , (startY+topPadding)) isEnabled:(self.currentLevel > index) isRight:NO];
        [paths addObject:borderPath];

    }

    return paths;
}

- (CAShapeLayer *)drawdottedLineWithPath:(UIBezierPath *)path withborderWidth:(CGFloat)lineWidth withColor: (UIColor *)color
{


    CAShapeLayer *shapelayer = [CAShapeLayer layer];
    shapelayer.strokeStart = 0.0;
    shapelayer.strokeColor = color.CGColor;
    shapelayer.lineWidth = lineWidth;
    shapelayer.lineJoin = kCALineJoinRound;
    shapelayer.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:15],[NSNumber numberWithInt:10 ], nil];
    shapelayer.path = path.CGPath;

    return shapelayer;

}

- (void)drawDirectionAt:(CGPoint)point isEnabled:(BOOL)enabled isRight:(BOOL)isRight{
    NSString *imageName;
    imageName = isRight ? @"right-arrow" : @"down-arrow";
    imageName = [NSString stringWithFormat:@"%@-%@",imageName,(enabled ? @"enabled" : @"disabled")];

    CAShapeLayer* direction = [CAShapeLayer layer];
    direction.opacity = 1.0;
    direction.frame = CGRectMake(0, 0, 16, 16);
    direction.position = point;
    [direction setContents:(id)[[UIImage imageNamed: imageName] CGImage]];
    [self.connectionLines addObject:direction];
    [self.collectionView.layer addSublayer: direction];
}

Answer 1

您不能在查询本身中使用别名，您应该将它全部包装在外部查询中：

  $.ajax('http://172.16.198.19/getData.jsonp', {
    type: 'get',
    dataType: 'jsonp',
    jsonp: false,
    jsonpCallback: 'parseData'
  }).done(function(data) {
    console.log(data.sensor[0].tc);
  }).fail(function() {
    console.log("nope");
  });  
}

为什么我不能限制我的排名（）？

1 个答案: