Thank you, Sekhar, et al.
I've done so: created a proper User Defined Java class (implementing
Externalizable), created the type in Derby, mapped the function, but it still
doesn't seem to work.
Here is what I'm trying to achieve (names such as JAVA_FUNCTION and
USER_DEFINED_TYPE are symbolic):
We have a fairly large SQL with an insanely large case statement.
One of the tables used in the SQL has many columns, 90 of which encode some
specific data, such as timeseries (for simplicity, let's call them Column00 -
Column89).
So, we mapped a Java function and then we need to do something like this:
select a,b,c,
case
when JAVA_FUNCTION(d,e,f) = 0 then COLUMN00
when JAVA_FUNCTION(d,e,f) = 1 then COLUMN01
when JAVA_FUNCTION(d,e,f) = 2 then COLUMN02
...
when JAVA_FUNCTION(d,e,f) = 88 then COLUMN89
else COLUMN89
end as col_value
...
But such select causes JAVA_FUNCTION to be invoked 90 times.
So, we tried to simplify this by having a JAVA_FUNCTION which takes the params:
select a,b,c
JAVA_FUNCTION(d,e,f,COLUMN00,..,COLUMN89) as col_value
...
So, that the switch happens in Java, but that's when we ran into the "number of
arguments" limit of 90.
As per your suggestion, I created a UDT which takes 90 parameters and assigns
them to the internal array.
Then an inner function calculates an index into that array based on (d,e,f) and
returns the value without resorting to a switch.
So, I was able to properly define and create the UDT and the function, but have
trouble invoking it.
What I’m attempting to do is:
select a,b,c,
JAVA_FUNCTION(d,e,f,USER_DEFINED_TYPE(COLUMN00, ... , COLUMN89)) as col_value
...
But doing so causes the following error:
java.sql.SQLSyntaxErrorException: 'USER_DEFINED_TYPE' is not recognized as a
function or procedure.
at
org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown
Source)
at
org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown
Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown
Source)
at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
Caused by: ERROR 42Y03: 'USER_DEFINED_TYPE' is not recognized as a function or
procedure.
at org.apache.derby.iapi.error.StandardException.newException(Unknown
Source)
at
org.apache.derby.impl.sql.compile.StaticMethodCallNode.bindExpression(Unknown
Source)
at
org.apache.derby.impl.sql.compile.JavaToSQLValueNode.bindExpression(Unknown
Source)
at
org.apache.derby.impl.sql.compile.SQLToJavaValueNode.bindExpression(Unknown
Source)
at
org.apache.derby.impl.sql.compile.MethodCallNode.bindParameters(Unknown Source)
at
org.apache.derby.impl.sql.compile.StaticMethodCallNode.bindExpression(Unknown
Source)
at
org.apache.derby.impl.sql.compile.JavaToSQLValueNode.bindExpression(Unknown
Source)
at
org.apache.derby.impl.sql.compile.ResultColumn.bindExpression(Unknown Source)
at
org.apache.derby.impl.sql.compile.ResultColumnList.bindExpressions(Unknown
Source)
at org.apache.derby.impl.sql.compile.SelectNode.bindExpressions(Unknown
Source)
at
org.apache.derby.impl.sql.compile.TableOperatorNode.bindExpressions(Unknown
Source)
at org.apache.derby.impl.sql.compile.UnionNode.bindExpressions(Unknown
Source)
at
org.apache.derby.impl.sql.compile.TableOperatorNode.bindExpressions(Unknown
Source)
at org.apache.derby.impl.sql.compile.UnionNode.bindExpressions(Unknown
Source)
at
org.apache.derby.impl.sql.compile.DMLStatementNode.bindExpressions(Unknown
Source)
at org.apache.derby.impl.sql.compile.DMLStatementNode.bind(Unknown
Source)
at org.apache.derby.impl.sql.compile.CursorNode.bindStatement(Unknown
Source)
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
at
org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown
Source)
What am I doing incorrectly?
Thanks,
-----Original Message-----
From: Sekhar [mailto:[email protected]]
Sent: Friday, December 28, 2012 1:22 AM
To: [email protected]
Subject: Re: number of parameters
Pavel Bortnovskiy <pbortnovskiy@...> writes:
>
>
>
> Hello:
>
> we have a need to create a java-mapped function which will take 92
parameters, but we are running into Derby’s limitation:
>
> Caused by: java.sql.SQLException: The limit for the number of
> parameters for
a procedure has been exceeded. Limit is 90 and number of parameters for
procedure
> CALC_VALUES are 92.
>
> http://db.apache.org/derby/docs/10.8/ref/rrefdbmlimits.html
>
> Can this limit either be increased or worked-around?
>
> Thanks,
> Pavel.
>
>
>
Hi Pavel
The best solution is rather than passing 92 method parameters we can create
User Defined Type in Derby. An UDT will point to external java class where we
can have all parameters as properties. now you can use this class as a single
parameter.
Regards
Sekhar.
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