Question

我有一个MySQL数据库，其中存储了某些项目的销售。我想比较过去两天的销售情况，例如：过去10天和过去9天。我计算出MySQL查询：

select s1.sales - s2.sales from ProductSales as s1
left join ProductSales as s2 on s2.date >= DATE(DATE_ADD(Now(), INTERVAL '-10' DAY)) and s2.date <= DATE(DATE_ADD(Now(), INTERVAL '-9' DAY)) and s2.product_id = s1.product_id
where s1.date >= DATE(DATE_ADD(Now(), INTERVAL '-9' DAY));

我想在Grails应用程序中以编程方式执行此操作，我需要将此查询转换为条件或HQL查询。我该怎么做？

更新：我试过这样：

def date1 = new Date() - 2
def date2 = new Date() - 1
def sales = ProductSales.executeQuery( """
    select s1.sales - s2.sales from ProductSales s1
    left join ProductSales s2
    where s1.date >= :date2
    and s2.date >= :date1 and s2.date < :date2 and s2.product_id = s1.product_id""",
[ date1: date1, date2: date2 ] )

不幸的是，这给了我：

ERROR hql.ast.ErrorCounter -  Path expected for join!
ERROR hql.ast.ErrorCounter -  Invalid path: 's2.sales'
ERROR hql.ast.ErrorCounter -  right-hand operand of a binary operator was null
ERROR hql.ast.ErrorCounter -  Invalid path: 's2.date'
ERROR hql.ast.ErrorCounter - <AST>:0:0: unexpected end of subtree
ERROR hql.ast.ErrorCounter -  left-hand operand of a binary operator was null
ERROR hql.ast.ErrorCounter -  Invalid path: 's2.date'
ERROR hql.ast.ErrorCounter - <AST>:0:0: unexpected end of subtree
ERROR hql.ast.ErrorCounter -  left-hand operand of a binary operator was null
ERROR hql.ast.ErrorCounter -  Invalid path: 's2.product_id'
ERROR hql.ast.ErrorCounter - <AST>:0:0: unexpected end of subtree
ERROR hql.ast.ErrorCounter -  left-hand operand of a binary operator was null
ERROR logging.impl.SLF4JLog - QuerySyntaxException occurred when processing request: [GET] /app/dashboard
Path expected for join!

更新2 ：由于我无法回答我自己的问题，我在此处添加回复：

显然这可以正常运作：

def now = new Date()
def date1 = now - 2
def date2 = now - 1
def sales = ProductSales.executeQuery( """
    select s1.owner, s1.sales - s2.sales from ProductSales s1, ProductSales s2
    where s1.date >= :date2 and s1.date < :now 
    and s2.date >= :date1 and s2.date < :date2 and s2.product = s1.product""",
    [ date1: date1, date2: date2, now: now ]
    )

我不完全确定left join和select from T1, T2之间有什么区别。从那里开始，我为最近的条目添加了上限（now），并将product_id更改为product。

Answer 1

显然这可以正常运作：

def now = new Date()
def date1 = now - 2
def date2 = now - 1
def sales = ProductSales.executeQuery( """
    select s1.owner, s1.sales - s2.sales from ProductSales s1, ProductSales s2
    where s1.date >= :date2 and s1.date < :now 
    and s2.date >= :date1 and s2.date < :date2 and s2.product = s1.product""",
    [ date1: date1, date2: date2, now: now ]
    )

我不完全确定left join和select from T1, T2之间有什么区别。从那里开始，我为最近的条目添加了上限（now），并将product_id更改为product。

具有左连接和日期函数的Grails标准或用于MySQL查询的HQL

1 个答案: