Dear MySQL users,
MySQL Connector/C++ 8.0.20 is a new release version of the MySQL
Connector/C++ 8.0 series.
Connector/C++ 8.0 can be used to access MySQL implementing Document
Store or in a traditional way, using SQL queries. It allows writing
both C++ and plain C applications using X DevAPI and X DevAPI for C.
It also supports the legacy API of Connector/C++ 1.1 based on JDBC4.
To learn more about how to write applications using X DevAPI, see
“X DevAPI User Guide” at
https://dev.mysql.com/doc/x-devapi-userguide/en/
See also “X DevAPI Reference” at
https://dev.mysql.com/doc/dev/connector-cpp/devapi_ref.html
and “X DevAPI for C Reference” at
https://dev.mysql.com/doc/dev/connector-cpp/xapi_ref.html
For generic information on using Connector/C++ 8.0, see
https://dev.mysql.com/doc/dev/connector-cpp/
For general documentation about how to get started using MySQL
as a document store, see
http://dev.mysql.com/doc/refman/8.0/en/document-store.html
To download MySQL Connector/C++ 8.0.20, see the “General Availability (GA)
Releases” tab at
https://dev.mysql.com/downloads/connector/cpp/
Changes in MySQL Connector/C++ 8.0.20 (2020-04-27, General Availability)
Connection Management Notes
* For connections made using X Plugin, Connector/C++ now
provides control over the use of compression to minimize
the number of bytes sent over connections to the server.
Connection URIs and SessionSettings objects permit
explicitly specifying a compression option:
+ URI strings permit a compression option with
permitted values of DISABLED, PREFERRED, and
REQUIRED (not case-sensitive). Examples:
mysqlx://user:password@host:port/db?compression=DISABLED
mysqlx://user:password@host:port/db?compression=PREFERRED
mysqlx://user:password@host:port/db?compression=REQUIRED
+ SessionSettings object permit a
SessionOption::COMPRESSION option with permitted
values of CompressionMode::DISABLED,
CompressionMode::PREFERRED, and
CompressionMode::REQUIRED. Example:
mysqlx::Session sess(SessionOption::PORT, “user_name”,
SessionOption::USER, “password”,
SessionOption::COMPRESSION,
CompressionMode::PREFERRED);
These rules apply:
+ If compression is disabled, the connection is
uncompressed.
+ If compression is preferred, Connector/C++
negotiates with the server to find a compression
algorithm supported in common on the server and
client sides. If no common algorithm is available,
the connection is uncompressed.
+ If compression is required, compression algorithm
negotiation occurs as with compression preferred. If
no common algorithm is available, the connection
terminates with an error.
To avoid CPU inefficiency, data packets are not
compressed even when compression is enabled unless they
exceed a threshold size (currently 1000 bytes; this is
subject to change).
See also Connection Compression with X Plugin
(https://dev.mysql.com/doc/refman/8.0/en/x-plugin-connection-compression.html).
Packaging Notes
* Previously, Connector/C++ binary distributions were
compatible with projects built using MSVC 2019 (using
either dynamic or static connector libraries) or MSVC
2017 (using dynamic connector libraries only). Binary
distributions now are also compatible with MSVC 2017
using the static X DevAPI connector library. This means
that binary distributions are fully compatible with MSVC
2019, and fully compatible with MSVC 2017 with the
exception of the static legacy (JDBC) connector library.
Bugs Fixed
* For connections made using X Plugin, the last byte was
removed from DATETIME values fetched as raw bytes. (Bug
#30838230)
* In X DevAPI expressions, Connector/C++ treated the JSON
->> operator the same as ->, rather than applying an
additional JSON_UNQUOTE() operation. (Bug #29870832)
* Comparison of JSON values from query results failed due
to an extra \0 character erroneously being added to the
end of such values. (Bug #29847865)
* For connections made using X Plugin, warnings sent
following result sets were not captured, and were thus
unavailable to getWarnings(). (Bug #28047970)
On Behalf of Oracle/MySQL Release Engineering Team,
Hery Ramilison
MySQL Connector/C++ 8.0.20 has been released
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