Reading LONG Oracle columns in .Net

If you use ODP.Net to access an Oracle database from .Net, and select LONG text columns, the DataReader’s GetString() method will return an empty string.

To work around this behavior, you need to set the InitialLONGFetchSize to a non-zero value, and use the OracleDataReader‘s GetOracleString() method, and use ToString() to convert the result into a .Net string.

Another possibility is to set InitialLONGFetchSize to -1, so that GetString() works as expected.

The linked documentation also explains how to access LONG RAW data.

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