Dear MySQL users,

MySQL Connector/C++ 8.0.6-dmr is the next development milestone release
(dmr) 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++ applications using X DevAPI or plain C applications using
XAPI.

To learn more about how to write applications using X DevAPI, see
"X DevAPI User Guide"

https://dev.mysql.com/doc/x-devapi-userguide/en/

and "X DevAPI Reference" at

https://dev.mysql.com/doc/dev/connector-cpp/devapi_ref.html

For more information about using plain C XAPI see "XAPI 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/

Note

Connector/C++ 8.0 requires MySQL Server version 5.7.12 or higher with
X Plugin enabled. For general documentation about how to get started
using MySQL as a document store, see "Using MySQL as a Document Store"

https://dev.mysql.com/doc/refman/5.7/en/document-store.html

To download MySQL Connector/C++ 8.0.6-dmr, see the "Development Releases"
tab at

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


Changes in MySQL Connector/C++ 8.0.6-dmr (Not yet released, Development
Milestone)

Functionality Added or Changed

* A session now can acquire a lock for documents or rows
returned by find or select statements, to prevent the
returned values from being changed from other sessions
while the lock is held (provided that appropriate
isolation levels are used). Locks can be requested
several times for a given find or select statement. Only
the final request is acted upon. An acquired lock is held
until the end of the current transaction.
For X DevAPI, CollectionFind and TableSelect implement
.lockExclusive() and .lockShared() methods, which request
exclusive or shared locks, respectively, on returned
documents or rows. These methods can be called after
.bind() and before the final .execute().
For XAPI, the new mysqlx_set_locking(stmt, lock) function
can be called to request exclusive or shared locks on
returned documents or rows, or to release locks. The lock
parameter can be ROW_LOCK_EXCLUSIVE, ROW_LOCK_SHARED, or
ROW_LOCK_NONE. The first two values specify a type of
lock to be acquired. ROW_LOCK_NONE removes any row
locking request from the statement.

* For X DevAPI, a new auth option can be specified in
connection strings or URIs to indicate the authentiation
mechanism. Permitted values are PLAIN and MYSQL41. The
option name and value are not case sensitive. The
SessionSettings::Options object supports a new AUTH
enumeration, with the same permitted values.
For XAPI, a new auth setting can be specified in
connection strings or URIs to indicate the authentiation
mechanism. Permitted values are PLAIN and MYSQL41. The
option name and value are not case sensitive. A new
MYSQLX_OPT_AUTH constant is recognized by the
mysqlx_options_set() function, with permitted values
MYSQLX_AUTH_PLAIN and MYSQLX_AUTH_MYSQL41.
If the authentication mechanism is not specified, it
defaults to PLAIN for secure (TLS) connections, or
MYSQL41 for insecure connections. For Unix socket
connections, the default is PLAIN.

* These drop API changes were made:

+ Session::dropTable(schema, table) and
Session::dropCollection(schema, coll) were replaced
by Schema::dropTable(table) and
Schema::dropCollection(coll), respectively.

+ Schema::dropView() is now a direct-execute method
returning void rather than Executable.

+ All dropXXX() methods succeed if the dropped objects
do not exist.

* The following Collection methods were added:
addOrReplaceOne(), getOne(), replaceOne(), and
removeOne().
The addOrReplaceOne() and replaceOne() methods work only
with MySQL 8.0.3 and higher servers. For older servers,
they report an error.

* Boolean expressions used in queries and statements now
support a variant of the IN operator for which the right
hand side operand is any expression that evaluates to an
array or document.
X DevAPI example:
coll.find("'car' IN $.toys").execute();

XAPI example:
res = mysqlx_collection_find(coll, "'car' IN $.toys");

In this form, the IN operator is equivalent to the
JSON_CONTAINS() SQL function.

* On Unix and Unix-like systems, Unix domain socket files
are now supported as a connection transport for X DevAPI
or XAPI connections. The socket file can be given in a
connection string or in the session creation options.
X DevAPI examples:
XSession sess("mysqlx://user:password@(/path/to/mysql.sock)/schema");

XSession sess({ SessionSettings::USER, "user",
SessionSettings::PWD, "password,
SessionSettings::SOCKET, "/path/to/mysql.sock"
SessionSettings::DB, "schema" });

XAPI examples:
mysqlx_session_t *sess = mysqlx_get_session_from_url(
"mysqlx://user:password@(/path/to/mysql.sock)/schema",
err_buf, &err_code
);

mysqlx_opt_type_t *sess_opt = mysqlx_session_option_new();
mysqlx_session_option_set(sess_opt,
MYSQLX_OPT_SOCKET, "/path/to/mysql.sock",
MYSQLX_OPT_USER, "user",
MYSQLX_OPT_PWD, "password",
MYSQLX_OPT_DB, "schema");

mysqlx_session_t *sess = mysqlx_get_session_from_options(
sess_opt, err_buf, &err_code
);

Bugs Fixed

* Creating a TLS session with only the ssl-ca option
specified could succeed, although it should fail if
ssl-mode is not also specified. (Bug #26226502)

* mysqlx_get_node_session_from_options() could succeed even
when a preceding mysqlx_session_option_set() failed.
(Bug #26188740)

On Behalf of the MySQL/Oracle Release Engineering Team,
Daniel Horecki


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