OracleException when using custom valueconverter

Discussion of open issues, suggestions and bugs regarding Entity Framework support in ADO.NET Data providers
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Joined: Fri 10 Aug 2018 09:55

OracleException when using custom valueconverter

Post by domrin » Thu 11 Oct 2018 07:36


We're having an issue when using the entity framework core value converter ( ... onversions) in order to convert a column in an Oracle database that is stored as an int and representated by unix epoch time.

Here is what we use in our dbcontext to set up the column. Note that this does work with other entity framework providers as well as a couple of open source Oracle Entity Framework providers.

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var intDateConverter = new ValueConverter<DateTime, int>(
               v => v.ToEpochTime(),
               v => v.ToDateTimeFromEpoch()

entity.Property(p => p.CreateDate).HasColumnName("CREATE_DATE").HasConversion(intDateConverter);
In the case above, p.CreateDate is a DateTime and the Column "CREATE_DATE" is stored as an INT in the oracle db.

This seems to function OK when doing basic SELECTs and the model seems to convert ok but when doing anything that requires a filter such as

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model.Where(m => m.CreateDate > someDateTime);
Then this is what is generated:

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WHERE CREATE_DATE > TO_DATE('2018-10-03', 'yyyy-mm-dd')
which causes this error

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Devart.Data.Oracle.OracleException (0x80004005): ORA-00932: inconsistent datatypes: expected NUMBER got DATE
We've just purchased a licence but this is going to be a bit of an awkward thing to work around. Can anyone help us out?


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Re: OracleException when using custom valueconverter

Post by Shalex » Mon 15 Oct 2018 14:23

Thank you for your report. We will investigate the issue and notify you about the result.

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