* Add BeforeConnect callback to pgxpool.Config (Robert Froehlich)
* Add Ping method to pgxpool.Conn (davidsbond)
* Added a kitlog level log adapter (Fabrice Aneche)
* Make ScanArgError public to allow identification of offending column (Pau Sanchez)
* Add *pgxpool.AcquireFunc
* Add BeginFunc and BeginTxFunc
* Add prefer_simple_protocol to connection string
* Add logging on CopyFrom (Patrick Hemmer)
* Add comment support when sanitizing SQL queries (Rusakow Andrew)
* Do not panic on double close of pgxpool.Pool (Matt Schultz)
* Avoid panic on SendBatch on closed Tx (Matt Schultz)
* Update pgconn to v1.8.1
* Update pgtype to v1.7.0
# 4.10.1 (December 19, 2020)
* Fix panic on Query error with nil stmtcache.
# 4.10.0 (December 3, 2020)
* Add CopyFromSlice to simplify CopyFrom usage (Egon Elbre)
* Remove broken prepared statements from stmtcache (Ethan Pailes)
* stdlib: consider any Ping error as fatal
* Update puddle to v1.1.3 - this fixes an issue where concurrent Acquires can hang when a connection cannot be established
* Update pgtype to v1.6.2
# 4.9.2 (November 3, 2020)
The underlying library updates fix an issue where appending to a scanned slice could corrupt other data.
* Update pgconn to v1.7.2
* Update pgproto3 to v2.0.6
# 4.9.1 (October 31, 2020)
* Update pgconn to v1.7.1
* Update pgtype to v1.6.1
* Fix SendBatch of all prepared statements with statement cache disabled
# 4.9.0 (September 26, 2020)
* pgxpool now waits for connection cleanup to finish before making room in pool for another connection. This prevents temporarily exceeding max pool size.
* Fix when scanning a column to nil to skip it on the first row but scanning it to a real value on a subsequent row.
* Fix prefer simple protocol with prepared statements. (Jinzhu)
* Fix FieldDescriptions not being available on Rows before calling Next the first time.
* Various minor fixes in updated versions of pgconn, pgtype, and puddle.
# 4.8.1 (July 29, 2020)
* Update pgconn to v1.6.4
* Fix deadlock on error after CommandComplete but before ReadyForQuery
* Fix panic on parsing DSN with trailing '='
# 4.8.0 (July 22, 2020)
* All argument types supported by native pgx should now also work through database/sql
* Update pgconn to v1.6.3
* Update pgtype to v1.4.2
# 4.7.2 (July 14, 2020)
* Improve performance of Columns() (zikaeroh)
* Fix fatal Commit() failure not being considered fatal
* Update pgconn to v1.6.2
* Update pgtype to v1.4.1
# 4.7.1 (June 29, 2020)
* Fix stdlib decoding error with certain order and combination of fields
# 4.7.0 (June 27, 2020)
* Update pgtype to v1.4.0
* Update pgconn to v1.6.1
* Update puddle to v1.1.1
* Fix context propagation with Tx commit and Rollback (georgysavva)
* Add lazy connect option to pgxpool (georgysavva)
* Fix connection leak if pgxpool.BeginTx() fail (Jean-Baptiste Bronisz)
* Add native Go slice support for strings and numbers to simple protocol
* stdlib add default timeouts for Conn.Close() and Stmt.Close() (georgysavva)
* Assorted performance improvements especially with large result sets
* Fix close pool on not lazy connect failure (Yegor Myskin)
* Add Config copy (georgysavva)
* Support SendBatch with Simple Protocol (Jordan Lewis)
* Better error logging on rows close (Igor V. Kozinov)
* Expose stdlib.Conn.Conn() to enable database/sql.Conn.Raw()
Technically, two changes are breaking changes, but in practice these are extremely unlikely to break existing code.
* Conn.Begin and Conn.BeginTx return a Tx interface instead of the internal dbTx struct. This is necessary for the Conn.Begin method to signature as other methods that begin a transaction.
* Add Conn() to Tx interface. This is necessary to allow code using a Tx to access the *Conn (and pgconn.PgConn) on which the Tx is executing.
## Fixes
* Releasing a busy connection closes the connection instead of returning an unusable connection to the pool
* Do not mutate config.Config.OnNotification in connect
# 4.0.1 (September 19, 2019)
* Fix statement cache cleanup.
* Corrected daterange OID.
* Fix Tx when committing or rolling back multiple times in certain cases.
* Improve documentation.
# 4.0.0 (September 14, 2019)
v4 is a major release with many significant changes some of which are breaking changes. The most significant are
included below.
* Simplified establishing a connection with a connection string.
* All potentially blocking operations now require a context.Context. The non-context aware functions have been removed.
* OIDs are hard-coded for known types. This saves the query on connection.
* Context cancellations while network activity is in progress is now always fatal. Previously, it was sometimes recoverable. This led to increased complexity in pgx itself and in application code.
* Go modules are required.
* Errors are now implemented in the Go 1.13 style.
*`Rows` and `Tx` are now interfaces.
* The connection pool as been decoupled from pgx and is now a separate, included package (github.com/jackc/pgx/v4/pgxpool).
* pgtype has been spun off to a separate package (github.com/jackc/pgtype).
* pgproto3 has been spun off to a separate package (github.com/jackc/pgproto3/v2).
* Logical replication support has been spun off to a separate package (github.com/jackc/pglogrepl).
* Lower level PostgreSQL functionality is now implemented in a separate package (github.com/jackc/pgconn).
* Tests are now configured with environment variables.
* Conn has an automatic statement cache by default.
