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MySQL Connector/C++ 8.0.17 has been released
Posted by: Piotr Obrzut
Date: July 22, 2019 08:33AM

Dear MySQL users,

MySQL Connector/C++ 8.0.17 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++ 8.0.17, see the "Generally Available (GA)
Releases" tab at

  https://dev.mysql.com/downloads/connector/cpp/

==================================================

Changes in MySQL Connector/C++ 8.0.17 (2019-07-22, General
Availability)


     * Character Set Support

     * Compilation Notes

     * Configuration Notes

     * Function and Operator Notes

     * X DevAPI Notes

     * Functionality Added or Changed

     * Bugs Fixed

Character Set Support


     * Connector/C++ now supports the new utf8mb4_0900_bin
       collation added for the utf8mb4 Unicode character set in
       MySQL 8.0.17. For more information about this collation,
       see Unicode Character Sets
(https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html).

Compilation Notes


     * Connector/C++ now compiles cleanly using the C++14
       compiler. This includes MSVC 2017. Binary distributions
       from Oracle are still built in C++11 mode using MSVC 2015
       for compatibility reasons.

Configuration Notes


     * The maximum permitted length of host names throughout
       Connector/C++ has been raised to 255 ASCII characters, up
       from the previous limit of 60 characters. Applications
       that expect host names to be a maximum of 60 characters
       should be adjusted to account for this change.

Function and Operator Notes


     * Connector/C++ now supports the OVERLAPS and NOT OVERLAPS
       operators for expressions on JSON arrays or objects:
expr OVERLAPS expr
expr NOT OVERLAPS expr

       Suppose that a collection has these contents:
[{
   "_id": "1",
   "list": [1, 4]
 }, {
   "_id": "2",
   "list": [4, 7]
}]

       This operation:
auto res = collection.find("[1, 2, 3] OVERLAPS $.list").fields("_id").
execute();
res.fetchAll();

       Should return:
[{ "_id": "1" }]

       This operation:
auto res = collection.find("$.list OVERLAPS [4]").fields("_id").execut
e();
res.fetchAll();

       Should return:
[{ "_id": "1" }, { "_id": "2" }]

       An error occurs if an application uses either operator
       and the server does not support it.

X DevAPI Notes


     * For index specifications passed to the
       Collection::createIndex() method (for X DevAPI
       applications) or the mysqlx_collection_create_index()
       function (for X DevAPI for C applications), Connector/C++
       now supports indexing array fields. A single index field
       description can contain a new member name array that
       takes a Boolean value. If set to true, the field is
       assumed to contain arrays of elements of the given type.
       For example:
coll.createIndex("idx",
  R"({ "fields": [{ "field": "foo", "type": "INT", "array": true }] })
"
);

       In addition, the set of possible index field data types
       (used as values of member type in index field
       descriptions) is extended with type CHAR(N), where the
       length N is mandatory. For example:
coll.createIndex("idx",
  R"({ "fields": [{ "field": "foo", "type": "CHAR(10)" }] })"
);

Functionality Added or Changed


     * Previously, Connector/C++ reported INT in result set
       metadata for all integer result set columns, which
       required applications to check column lengths to
       determine particular integer types. The metadata now
       reports the more-specific TINYINT, SMALLINT, MEDIUMINT,
       INT, and or BIGINT types for integer columns. (Bug
       #29525077)

Bugs Fixed


     * Calling a method such as .fields() or .sort() on existing
       objects did not overwrite the effects of any previous
       call. (Bug #29402358)

     * When Connector/C++ applications reported connection
       attributes to the server upon establishing a new
       connection, some attributes were taken from the host on
       which Connector/C++ was built, not the host on which the
       application was being run. Now application host
       attributes are sent. (Bug #29394723)

     * Assignments of the following form on CollectionFind
       objects invoked a copy assignment operator, which was
       nonoptimal and prevented potential re-execution of
       statements using prepared statements:
find = find.limit(1);

       (Bug #29390170)

     * Legal constructs of this form failed to compile:
for (string id : res.getGeneratedIds()) { ... }

       (Bug #29355100)

     * During build configuration, CMake could report an
       incorrect OpenSSL version. (Bug #29282948)

Enjoy and thanks for the support!

On Behalf of Oracle/MySQL Release Engineering Team,
Piotr Obrzut

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