You can now write a custom authentication plugin, taking advantage of the pluggable authentication feature available in MySQL 5.5.16 and higher. See Writing a Custom Authentication Plugin for details. (WL #6357)

Under some circumstances, setting CacheServerProperties=true in the connection string could cause a Packet too large error. With connection pooling enabled and CacheServerProperties=true, the first connection worked as expected, but the second, third, and so on connections failed if the query exceeded 1024 bytes. (Bug #14593547, Bug #66578)

Connector/NET did not support creating an entity with a key of type string. During database creation, a MySqlException was thrown saying BLOB/TEXT column 'Name' used in key specification without a key length. The DDL produced by the provider specified a MEDIUMTEXT column for the primary key without specifying a length for the key. This fix is particularly important when working with Entity Framework versions 4.3 and later, since the __MigrationsHitory table (which replaces the EdmMetadata table) uses a string property as its key. (Bug #14540202, Bug #65289, Bug #64288)

The ExecuteNonQuery() could return an error Parameter '?' must be defined, when attempting to execute a statement such as:

insert into table_name (Field1, Field1) VALUES(?,?)

That is, when referencing the same field twice with two different ? placeholders. (Bug #14499549, Bug #66060)

When using a MySQL database set up as UTF32 as an ASP.net membership database, web applications could give a “key too long” error, and the Website Administration Tool would not connect to providers. The cause was that the column my_aspnet_sessions.SessionId, when converted from Latin1 character set to UTF32 with 4 bytes per character, exceeded the length limit for a primary key:

Specified key was too long; max key length is 767 bytes

(Bug #14495292, Bug #65144)

The MySQL Connector/NET EntityFramework provider would throw NullReferenceException when trying to insert a new record with an empty VALUES clause. Such an INSERT should work when the only required (NOT NULL) column in the table is a primary key auto-increment column. (Bug #14479715, Bug #66066)

Using the Entity Data Model Designer decimal type and CreateDatabase function, the values were stored with 0 digits at the right of the decimal point. With this fix, the default is 2 digits to the right of the decimal point, and any precision specified through the Entity Data Model Designer is applied correctly. (Bug #14474342, Bug #65127)

Customizing precision by calling the HasPrecision() method within the OnModelCreating() method in a Code First project would always produce precision settings (10,2) rather than the specified precision. (Bug #14469048, Bug #65001)

When building commands through the MySql.Data.MySqlClient.MySqlCommand() class, memory could be leaked because some IO.MemoryStream instances were not being freed efficiently. The memory leak could be an issue in SQL-heavy applications, for example a logging application processing large numbers of INSERT statements. (Bug #14468204, Bug #65696)

When using the ASP.net web security functionality with a MySQL database, using features that access the my_aspnet_usersinroles table caused an exception:

MySql.Data.MySqlClient.MySqlException: Table 'testdb.my_aspnet_usersinrole' doesn't exist.

For example, this error could occur when trying to remove the user from a role or find users in a role. The fix corrects the spelling of the table name to my_aspnet_usersinroles. (Bug #14405338, Bug #65805)

Although the member variable MySqlCommand.LastInsertedId was a 64-bit long, its value was effectively capped at the maximum value of Int32 (2,147,483,647). If a primary key exceeded this value, the value of LastInsertedId was wrong. This mismatch could be an issue for tables with large numbers of rows. (Bug #14171960, Bug #65452)

When using the Entity Framework Code First approach, the generated code could be use the MEDIUMTEXT data type in contexts where other types such as VARCHAR were more appropriate, leading to errors such as:

error 0064: Facet 'MaxLength' must not be specified for type 'mediumtext'.

(Bug #13582335, Bug #63920)