问题
I have the following problem which could (I am hoping) have a standard solution.
I have a java application that interacts with the database and builds dynamically SQL strings.
So far I guess usual stuff.
Occusionally I need to have a sorting on the data and I use ORDER By. So far clear I guess.
Problem: I sometimes need to sort on a column that does not have the actual data but a short string that is a key to the actual data.
I mean:SELECT FROM MYTable WHERE MyTable.col1 = 'A' ORDER BY MyTable.col2 ASC
And col2 has values: AB, BY, CY which return sorted but are useless to me as these are keys to the actual values from a properties file and so the end result is not sorted.
What is the best way to solve this in a manner consistent with the way it currently works?
回答1:
If the data is not in the DB, then your choice is to either sort it in Java, or first insert the data from the property file into a temporary table and then join to that table and do the ORDER BY in SQL. If this is an operation that happens frequently, you might consider putting the properties into a permanent table.
来源：https://stackoverflow.com/questions/12975288/sort-from-sql-using-java