PHP.43-TP框架商城应用实例-后台18-商品属性3-库存量管理

库存量管理

　　思想：为商品的每个多选属性设置库存量！！要把多选属性排列组合分别指定库存量！！

　　效果如下：【由商品已经添加的属性决定】

1、建表goods_number{goods_id,goods_number,goods_str_id【商品属性id】}

drop if exists p39_goods_number;
create table p39_goods_number
(
    goods_id mediumint unsigned not null comment '商品Id',
    goods_number mediumint unsigned not null default '0' comment '库存量',
    goods_attr_id varchar(150) not null comment '商品属性表ID｛如果有多个，就拼接成字符串保存在这个字段中｝',
    key goods_id(goods_id)
)engine=InnoDB default charset=utf8 comment '库存量';

2、在控制器GoodsController.class.php中取出属性值，输出到表单中

注：A:循环输出商品属性时，将二维数组转成三维

B:库存量添加时，约束：前后台，ID必须升序排列。后台存时转升序，同理前台查询也先排序再查。避免前台调用数据时，属性反转的情况

C:修改时，删除原库存量，重新添加

　　　　//    处理库存量
    public function goods_number()
    {
        //接收商品ID
        $id = I('get.id');
        $gnModel = M('goods_number');

        //处理表单
        if(IS_POST)
        {
            // 先删除原库存，再添加，实现修改
            $gnModel->where(array(
                'goods_id' => array('eq', $id),
            ))->delete();
            $gaid = I('post.goods_attr_id');
            $gnum = I('post.goods_number');
            //统计数量，计算比例
            $cgaid = count($gaid);
            $cgnum = count($gnum);
            $rate = $cgaid/$cgnum;

            //循环库存量
            $_i = 0;
            foreach ($gnum as $k => $v)
            {
                $_goodsAttrId = array();
                //从商品属性ID数组中取出 $rate 个，循环一次取一个
                for($i=0; $i<$rate; $i++)
                {
                    $_goodsAttrId[] = $gaid[$_i];
                    $_i++;
                }
                //升序排列
                sort($_goodsAttrId, SORT_NUMERIC);    //以数字的形式排序
                //把取出来的商品属性ID转化成字符串
                $_goodsAttrId = (string)implode(',', $_goodsAttrId);
                $gnModel->add(array(
                    'goods_id' => $id,
                    'goods_attr_id' => $_goodsAttrId,
                    'goods_number' => $v,
                ));
            }
        }
        //(库存量修改)先取出这件商品已经设置过的库存量
        $gnData = $gnModel->where(array(
            'goods_id' => $id,
        ))->select();

        //根据商品ID取出这件商品所有属性的值和根据属性id，取出属性表中的属性名称
        $gaModel = M('goods_attr');
        $gaData = $gaModel->field('a.*, b.attr_name, b.attr_type')
        ->alias('a')
        ->join('LEFT JOIN __ATTRIBUTE__ b ON a.attr_id = b.id ')
        ->where(array(
            'goods_id' => array('eq', $id),
            'b.attr_type' => array('eq', '可选'),
        ))->select();

        //处理$gaData数据，将二维转为三维数组:把属性相同的归类
        $_gaData = array();
        foreach ($gaData as $k => $v)
        {
            $_gaData[$v['attr_name']][] = $v;        //以属性名称作为下标
        }
        //var_dump($_gaData);die;
        
        
        $this->assign(array(
            'gnData' => $gnData,
            'gaData' => $_gaData,
            '_page_title' => '库存量管理',
            '_page_btn_name' => '返回列表',
            '_page_btn_link' => U('lst'),
        ));
        //显示表单
        $this->display();
    }

3、在表单goods_number.html中显示

注：A:JS无效，调试出现如下错误：Uncaught ReferenceError: $ is not defined  (anonymous function)

解决方法：导入jquery类库

B:在表单页面中循环打印已有库存量

<layout name="layout" />

<!-- 库存列表 -->
<div class="list-div" id="listDiv">
<form method="POST" action="__SELF__">
    <table cellpadding="3" cellspacing="1">
        <tr>
            <!-- 循环输出属性 -->
            <?php foreach ($gaData as $k => $v): ?>
                <th><?php echo $k; ?></th>
            <?php endforeach; ?>
            <th width="120">库存量</th>
            <th width="60">操作</th>
        </tr>
        <?php if($gnData): ?>
            <?php foreach ($gnData as $k0 => $v0): ?>
            <tr class="tron">
                <?php 
                $gaCount = count($gaData);
                foreach ($gaData as $k => $v): ?>
                    <td>
                        <select name="goods_attr_id[]">
                            <option value="">请选择</option>
                            <?php foreach ($v as $k1 => $v1): 
                                    $_attr = explode(',', $v0['goods_attr_id']);
                                    if(in_array($v1['id'], $_attr))
                                        $select = 'selected="selected"';
                                    else 
                                        $select = '';
                            ?>
                                <option <?php echo $select; ?> value="<?php echo $v1['id']; ?>"><?php echo $v1['attr_value']; ?></option>
                            <?php endforeach; ?>
                        </select>
                    </td>
                <?php endforeach; ?>
                <td><input type="text" name="goods_number[]" value="<?php echo $v0['goods_number']; ?>" /></td>
                <td><input onclick="addNewTr(this);" type="button" value="<?php echo $k0==0?'+':'-'; ?>" /></td>
            </tr>
            <?php endforeach; ?>
        <?php else: ?>
            <tr class="tron">
                <?php 
                $gaCount = count($gaData);
                foreach ($gaData as $k => $v): ?>
                    <td>
                        <select name="goods_attr_id[]">
                            <option value="">请选择</option>
                            <?php foreach ($v as $k1 => $v1): ?>
                                <option value="<?php echo $v1['id']; ?>"><?php echo $v1['attr_value']; ?></option>
                            <?php endforeach; ?>
                        </select>
                    </td>
                <?php endforeach; ?>
                <td><input type="text" name="goods_number[]" value="" /></td>
                <td><input onclick="addNewTr(this);" type="button" value="+" /></td>
            </tr>
        <?php endif; ?>
        <tr id="submit">
            <td align="center" colspan="<?php echo $gaCount+2; ?>"><input type="submit" value="提交" /></td>
        </tr>
    </table>
</form>
</div>

<script type="text/javascript" src="__PUB__/umeditor1.2.3-utf8-php/third-party/jquery.min.js"></script>
<script type="text/javascript">
    function addNewTr(btn)
    {
        var tr = $(btn).parent().parent();
        if($(btn).val() == "+")
        {
            var newTr = tr.clone();
            newTr.find(":button").val("-");
            $("#submit").before(newTr);
        }
        else
            tr.remove();
        
    }
</script>
<script src="__PUB__/Admin/Js/tron.js"></script>

 4、在模型类GoodsModel.class.php中处理删除 =》删除商品，库存量一并删除