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NullReferenceException when executing stored procedure with enum as parameter #812

EkoPratomo opened this issue May 6, 2020 · 1 comment


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EkoPratomo commented May 6, 2020

NullReferenceException when executing stored procedure with enum as parameter.
Happens on version 0.65 and 0.57. It was fine on version 0.56.

CREATE PROCEDURE `proced`(IN input enum ('One', 'Two', 'Three'))
command.CommandText = "proced";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add(new MySqlParameter("input", "One"));
using(DbDataReader reader = await command.ExecuteReaderAsync()){}

I tried changing the parameter to varchar and it worked on all three versions.

CREATE PROCEDURE `proced`(IN input varchar(30))

Here's stack trace for version 0.65

System.NullReferenceException: Object reference not set to an instance of an object.
   at MySqlConnector.Core.TypeMapper.GetMySqlDbType(String typeName, Boolean unsigned, Int32 length) in /_/src/MySqlConnector/Core/TypeMapper.cs:line 169
   at MySqlConnector.Core.CachedParameter..ctor(Int32 ordinalPosition, String mode, String name, String dataType, Boolean unsigned, Int32 length) in /_/src/MySqlConnector/Core/CachedParameter.cs:line 21
   at MySqlConnector.Core.CachedProcedure.FillAsync(IOBehavior ioBehavior, MySqlConnection connection, String schema, String component, CancellationToken cancellationToken)
   at MySql.Data.MySqlClient.MySqlConnection.GetCachedProcedure(String name, Boolean revalidateMissing, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySql.Data.MySqlClient/MySqlConnection.cs:line 550
   at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 39

==== Edit 1 ====
After digging in the source code, i found that CachedProcedure.FillAsync is no longer using DATA_TYPE column from information_schema.parameters, instead it parses the dataType from DTD_IDENTIFIER column. That should be fine, but the parser doesn't seem to handle enum.
DTD_IDENTIFIER value for enum parameter should look like this enum('YES','NO').

@bgrainger bgrainger self-assigned this May 7, 2020
@bgrainger bgrainger added the bug label May 7, 2020
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Fixed in 0.66.0.

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