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Newsgroups: comp.lang.java.programmer
Subject: Re: Is there a SQL hashmap?
Date: Tue, 26 Jun 2018 12:23:50 -0500
Organization: Agency News - Dunedin, New Zealand
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To: Eric Douglas
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  To: Eric Douglas
From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>

On 6/26/2018 12:03 PM, Eric Douglas wrote:
> I'm using JDBC with java.sql.PreparedStatement on SQL Server 2012.
>
> I'm trying to write a translate that says "select <map value> (where
> table1.field = <map key>) from table1"
>
> Getting a bit tired of writing it as "select iif(table1.field =
> 'first key','first value',iif(table1.field = 'second key','second
> value','default')) from table1"
>
> Just a better syntax to do such a thing within the SQL, or a way to
> pass the values as a parameter?  Ideally I would just create a table
> and write the values there and join that table, but I don't want to
> alter that database which was created by our third party
> application.
>
> I was hoping to avoid the other option, modifying the code that gets
> the results of the query to translate that result field, since this
> section of the code is generic - used to send the results of multiple
> queries to a spreadsheet.


I think you already considered the two most obvious options.

1) Database table and JOIN.
2) Translate in application code.

Note that #2 is a lot more elegant if using JPA than plain JDBC.

String mappedfield1 = valmap.get(rs.getString("field1"));

vs:

@Column
private String field1;
...
public String getField1() {
     return field1;
}
public String getMappedField1() {
     return valmap.get(field1);
}

Arne

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