Question

我已经完成了一个类似这样的trac报告：

SELECT status, 
   id AS ticket, summary, priority, keywords,  
   datetime(changetime/1000000, 'unixepoch') AS last_updated, 
   milestone AS __group__,
   reporter, owner
  FROM ticket t
  WHERE status NOT IN ('closed', 'resolved') AND milestone in ('$MILESTONE')
  ORDER by t.milestone ASC, p.value

但是，如果用户未指定$MILESTONE的值，我想显示我们三个团队中每个团队的结果，按团队分组：

SELECT status, 
   id AS ticket, summary, priority, keywords,  
   datetime(changetime/1000000, 'unixepoch') AS last_updated, 
   milestone AS __group__,
   reporter, owner
  FROM ticket t
  WHERE status NOT IN ('closed', 'resolved') AND milestone in ('project1', 'project2', 'project3')
  ORDER by t.milestone ASC, p.value

如何检测sql查询中是否设置了变量？除此之外，是否有一种简单的方法可以在用户首次点击报告时设置$TEAM的默认值？

（注意：如果不这种方式在sql实现中是一般的，请将其标记为“sql”或发布评论，以便我可以这样做。）

Answer 1

您应该能够在WHERE子句中使用CASE WHEN ELSE语句，如下所示：

SELECT status, 
id AS ticket, summary, priority, keywords,  
datetime(changetime/1000000, 'unixepoch') AS last_updated, 
milestone AS __group__,
reporter, owner
FROM ticket t
WHERE status NOT IN ('closed', 'resolved') 
AND (CASE WHEN '$MILESTONE' != '' THEN (milestone='$MILESTONE') 
     ELSE (milestone in ('project1', 'project2', 'project3')) END)
ORDER by t.milestone ASC, p.value

在查询trac报告时检测未设置的$ VARIABLE

1 个答案: