Connector/Net 6.5 and higher support the fractional seconds feature introduced in MySQL 5.6.4. Fractional seconds could always be specified in a date literal or passed back and forth as parameters and return values, but the fractional part was always stripped off when stored in a table column. In MySQL 5.6.4 and higher, the fractional part is now preserved in data stored and retrieved through SQL. For fractional second handling in MySQL 5.6.4 and higher, see Fractional Seconds in Time Values. For the behavior of fractional seconds prior to MySQL 5.6.4, see Fractional Seconds in Time Values.
To use the more precise date and time types, specify a value
from 1 to 6 when creating the table column, for example
representing the number of digits of precision after the decimal
point. Specifying a precision of 0 leaves the fractional part
out entirely. In your C# or Visual Basic code, refer to the
Millisecond member to retrieve the fractional
second value from the
returned by the
DateTime object returned by the
GetDateTime function also contains the
fractional value, but only the first 3 digits.
For related code examples, see the following blog post: https://blogs.oracle.com/MySqlOnWindows/entry/milliseconds_value_support_on_datetime