San*_*der 5 coldfusion adobe sql-order-by qoq
我发现ColdFusion的查询组件有一些非常奇怪的行为.当您使用此组件构建另一个ColdFusion查询的查询(QoQ)查询并order by
在多个列上使用时,order by
列表中的最后一列将添加到所选输出中.这似乎发生在CF9,10,11和2016,但不是Lucee.
/* Create an unsorted CF-query */
unsorted = QueryNew("col1,col2,col3,col4","VarChar,VarChar,Integer,VarChar");
for (a=10;a gte 1;a--){
QueryAddRow(unsorted);
QuerySetCell(unsorted,"col1","col1 #a#");
QuerySetCell(unsorted,"col2","col2 #a#");
QuerySetCell(unsorted,"col3","#a#");
QuerySetCell(unsorted,"col4","col4 #a#");
}
writeDump(var="#unsorted#");
/* Create a new CF query of query with the unsorted table */
sorted = new query(
dbtype = "query"
,unsorted = unsorted
,sql = "select [col1],[col2] from unsorted order by [col3], [col4] asc"
).execute().getresult();
/* The last column in the order by list will be displayed in the result */
writeDump(var="#sorted#", label="sorted");
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在trycf.com上试试 这是最后一个查询的结果:
col1 col2 col4
1 col1 1 col2 1 1
2 col1 2 col2 2 2
3 col1 3 col2 3 3
4 col1 4 col2 4 4
5 col1 5 col2 5 5
6 col1 6 col2 6 6
7 col1 7 col2 7 7
8 col1 8 col2 8 8
9 col1 9 col2 9 9
10 col1 10 col2 10 10
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这是Adobe CF的已知错误吗?
有没有人知道ColdFusion QoQ中多列的不同,更好的订购方式?
好吧,我向 Adobe 报告了该错误: https: //tracker.adobe.com/#/view/CF-4200408并决定通过使用两个 QoQ 来解决该错误,分离数据的排序和列的选择,像这样:
/* Create an unsorted CF-query */
unsorted = QueryNew("col1,col2,col3,col4","VarChar,VarChar,Integer,VarChar");
for (a=10;a gte 1;a--){
QueryAddRow(unsorted);
QuerySetCell(unsorted,"col1","col1 #a#");
QuerySetCell(unsorted,"col2","col2 #a#");
QuerySetCell(unsorted,"col3","#a#");
QuerySetCell(unsorted,"col4","col4 #a#");
}
writeDump(var="#unsorted#");
/* Create a new CF query of query with the unsorted table */
sorted = new query(
dbtype = "query"
,unsorted = unsorted
,sql = "select [col1],[col2] from unsorted order by [col3], [col4] asc"
).execute().getresult();
/* The last column in the order by list will be displayed in the result */
writeDump(var="#sorted#", label="sorted");
selected = new query(
dbtype = "query"
,sorted = sorted
,sql = "select [col1],[col2] from sorted"
).execute().getresult();
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当然,你会因此受到很大的性能影响。在 Adobe 自行修复该错误之前,可能还有其他解决方案。例如,我发现 Ben Nadel 的这条古老评论演示了在哪里可以找到 cfquery 自定义标记的代码,并认为如果有人愿意的话,可以编辑该代码。