Is there something in java similar to SQL join?
For the experienced:I use java to process some data with approximately 25,000 lines, for example a text data file such as:
Field1:Field2:Old_ID:Field4:Field5:Field6: ...
Now the ID in the Old_ID field is old, and we are in the period of transition which need to have all the IDS of old converted in the new code. Each line is a user and each user has a identifier unique. A conversion table is provided for conversion, and it contains only two fields:Old_ID:New_ID
What I do now is to put all the lines of the conversion table in a card. The Old_ID is the key and the New_ID matches the value. A loop in the text file, for each value of Old_ID, I get help from New_IDconversionMap.get(Old_ID)
Who does the work OK. But it seems to me not very elegant. Assume that the table of conversion has 40,000 lines. For 25,000 lines of the data file, the code looks through the lines 40 000 25 000 times. I think it's the SQL command, which would beSelect d.Fiels1, d.Field2, c.New_ID, d.Field4, d.Field5, d.Field6
from data_file d, conversion_table c
where d.Old_ID = c.Old_ID
which I think would not go through the 40 000 25 000 times lines under the hood.Is there such a ready tool in the java API? Or is he left the developers themselves?
Thank you!
Newman
If you use a hash table, then you don't get all the keys 40,000 each time, only as many who have corresponding to codes. If the ID themselves are the codes, then they should be perfectly unique, which gives a list of choices of o (1) for each record.
Tags: Java
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