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MARIAEX_COMPATIBILITY.md

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Mariaex Compatibility

Mariaex is a popular MySQL driver for Elixir.

Below is a list of differences that should ease the transition between drivers.

Note, even though MyXQL may not support a given feature right now (or does it differently) it doesn't necessarily preclude changing that in the future.

Differences between MyXQL master and Mariaex v0.9.1

Connection:

  • MyXQL supports MySQL Pluggable Authentication system and ships with mysql_native_password, sha256_password, and caching_sha2_password authentication methods.

    Note: Mariaex added pluggable authentication support on master.

  • MyXQL defaults to using UNIX domain socket for connecting to the server. Forcing TCP with default options can be done by doing: MyXQL.start_link(protocol: :tcp). Mariaex defaults to TCP.

  • MyXQL does not support :sock_type option and uses :protocol option instead

  • MyXQL does not support :skip_database option, set database: nil instead

  • MyXQL does not support :datetime option and only works with Elixir calendar types (and not Erlang-style tuples)

  • MyXQL does not support :timeout option which specifies default timeout for queries, pass explicit :timeout when invoking MyXQL.query, MyXQL.execute etc instead

  • MyXQL does not support :encoder, :decoder, sync_connect, formatter, :parameters, and :insecure_auth options

Queries:

  • Mariaex.query/4 function uses query_type: nil option to try executing binary query and if that fails, fallback to using a text query. MyXQL uses query_type: :binary_then_text for that instead.

    Mariaex defaults to query_type: nil, MyXQL defaults to query_type: :binary.

  • MyXQL represents bit type B'101' as <<1::1, 0::0, 1::1>> (<<5::size(3)>>), Mariaex represents it as <<5>>

  • MyXQL does not support :type_names, result_types, :decode, :encode_mapper, :decode_mapper, :include_table_name, and :binary_as options

  • Mariaex has incomplete support for executing queries with multiple statements (e.g. SELECT 1; SELECT 2); MyXQL does not support them at all and will return an SQL error

Error struct:

  • MyXQL.Error struct contains :mysql field for MySQL errors (e.g.: %{mysql: %{code: 1062, name: :ER_DUP_ENTRY}})

    Mariaex.Error contains a similar field called :mariadb with :code and :message fields

  • MyXQL.Error does not have :tag, :action, and :reason fields