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From "Niels Beekman" <n.beek...@wis.nl>
Subject RE: odd behaviour with select, resultset and header
Date Tue, 27 Jan 2009 12:11:44 GMT
When injecting SQL (using $) that affects column names, you should use
remapResults="true" on your select-statement.

Niels

-----Original Message-----
From: loctorp [mailto:boris.kartascheff@logica.com] 
Sent: Tuesday, January 27, 2009 10:33 AM
To: user-java@ibatis.apache.org
Subject: odd behaviour with select, resultset and header


hi there,
I experienced something rather peculiar yesterday:
My map:

<select id="getDataspaceValue" parameterClass="java.util.Map"
resultClass="java.lang.String">
		select $columnName$ from DATASPACE_TBL where
NAME="$dataspace$";
	</select>

I execute this query 2 times. First time o.k.:
...select EARLIESTSAMPLE from DATASPACE_TBL where NAME="PERFORMANCE";  
...Executing Statement:    select EARLIESTSAMPLE from DATASPACE_TBL
where
NAME="PERFORMANCE";  
...Parameters: []
...Types: []
... DEBUG java.sql.ResultSet - {rset-100004} ResultSet
... DEBUG java.sql.ResultSet - {rset-100004} Header: [EARLIESTSAMPLE]
... DEBUG java.sql.ResultSet - {rset-100004} Result: [1232499262400]

second time with different column name (I'm interested in another column
value):

...Preparing Statement:    select LATESTSAMPLE from DATASPACE_TBL where
NAME="PERFORMANCE";  
... Executing Statement:    select LATESTSAMPLE from DATASPACE_TBL where
NAME="PERFORMANCE";  
... DEBUG java.sql.PreparedStatement - {pstm-100005} Parameters: []
... DEBUG java.sql.PreparedStatement - {pstm-100005} Types: []
... DEBUG java.sql.ResultSet - {rset-100006} ResultSet

com.ibatis.common.jdbc.exception.NestedSQLException:   
--- The error occurred in
esa/egos/darc/admin/service/dataaccess/mysql/dataspace_mapping.xml.  
--- The error occurred while applying a result map.  
--- Check the getDataspaceValue-AutoResultMap.  
--- Check the result mapping for the 'EARLIESTSAMPLE' property.  
--- Cause: java.sql.SQLException: Column 'EARLIESTSAMPLE' not found.
....... and so on

obviously the column name is somehow memorized. Why is column
'EARLIESTSAMPLE' looked for? The query explicitly asks for columnvalue
for
'LATESTSAMPLE'. There is no column 'EARLIESTSAMPLE' in the resultSet for
this query... If I inverse the order of execution, the problem stays the
same, but then 'LATESTSAMPLE' is not found anymore...

The workaround for now is a simple alteration of the map:
  <select id="getDataspaceValue" parameterClass="java.util.Map"
resultClass="java.lang.String">
		select $columnName$ as _value from DATASPACE_TBL where
NAME="$dataspace$";
	</select>

which works, but I cannot explain the problem in the first place.

Maybe someone could bring light into this?

Thanks,
cheers
Mike

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