What's Changed

• [1.9] test stability improvement. by @methane in #1699
• [1.9] Transaction Commit/Rollback returns conn's cached error by @methane in #1702
• backport benchmark_test by @methane in #1706
• [1.9] optimize readPacket (#1705) by @methane in #1707
• [1.9] fix PING on compressed connections by @methane in #1723
• release v1.9.3 by @methane in #1725

Full Changelog: v1.9.2...v1.9.3

What's Changed

v1.9.2 is a re-release of v1.9.1 due to a release process issue; no changes were made to the content.

Full Changelog: v1.9.1...v1.9.2

What's Changed

• add Charset() option by @methane in #1679
• Fix FormatDSN missing ConnectionAttributes by @bogcon in #1619
• go.mod: fix go version format by @methane in #1682
• release v1.9.1 by @methane in #1683

New Contributors

• @bogcon made their first contribution in #1619

Full Changelog: v1.9.0...v1.9.1

Major Changes

• Implement zlib compression. (#1487)
• Supported Go version is updated to Go 1.21+. (#1639)
• Add support for VECTOR type introduced in MySQL 9.0. (#1609)
• Config object can have custom dial function. (#1527)

Bugfixes

• Fix auth errors when username/password are too long. (#1625)
• Check if MySQL supports CLIENT_CONNECT_ATTRS before sending client attributes. (#1640)
• Fix auth switch request handling. (#1666)

Other changes

• Add "filename:line" prefix to log in go-mysql. Custom loggers now show it. (#1589)
• Improve error handling. It reduces the "busy buffer" errors. (#1595, #1601, #1641)
• Use strconv.Atoi to parse max_allowed_packet. (#1661)
• rejectReadOnly option now handles ER_READ_ONLY_MODE (1290) error too. (#1660)

Full Changelog: v1.8.1...v1.9.0

New Contributors

• @dbussink made their first contribution in #1609
• @yokonao made their first contribution in #1615
• @pengbanban made their first contribution in #1620
• @aaronjheng made their first contribution in #1527
• @kratkyzobak made their first contribution in #1625
• @raffertyyu made their first contribution in #1640
• @minhquang4334 made their first contribution in #1647
• @joe-mann made their first contribution in #1487
• @arturmelanchyk made their first contribution in #1653
• @kolbe made their first contribution in #1660
• @bdollma-te made their first contribution in #1667

What's Changed

Bugfixes:

• fix race condition when context is canceled in #1562 and #1570

Full Changelog: v1.8.0...v1.8.1

What's Changed

Major changes

• Use SET NAMES charset COLLATE collation. by @methane in #1437

  • Older go-mysql-driver used collation_id in the handshake packet. But it caused collation mismatch in some situation.
  • If you don't specify charset nor collation, go-mysql-driver sends SET NAMES utf8mb4 for new connection. This uses server's default collation for utf8mb4.
  • If you specify charset, go-mysql-driver sends SET NAMES <charset>. This uses the server's default collation for <charset>.
  • If you specify collation and/or charset, go-mysql-driver sends SET NAMES charset COLLATE collation.

• PathEscape dbname in DSN. by @methane in #1432

  • This is backward incompatible in rare case. Check your DSN.

• Drop Go 1.13-17 support by @methane in #1420

  • Use Go 1.18+

• Parse numbers on text protocol too by @methane in #1452

  • When text protocol is used, go-mysql-driver passed bare []byte to database/sql for avoid unnecessary allocation and conversion.
  • If user specified *any to Scan(), database/sql passed the []byte into the target variabe.
  • This confused users because most user doesn't know when text/binary protocol used.
  • go-mysql-driver 1.8 converts integer/float values into int64/double even in text protocol. This doesn't increase allocation compared to []byte and conversion cost is negilible.

• New options start using the Functional Option Pattern to avoid increasing technical debt in the Config object. Future version may introduce Functional Option for existing options, but not for now.

  • Make TimeTruncate functional option by @methane in #1552
  • Add BeforeConnect callback to configuration object by @ItalyPaleAle in #1469

Other changes

• Adding DeregisterDialContext to prevent memory leaks with dialers we don't need anymore by @jypelle in #1422

• Make logger configurable per connection by @frozenbonito in #1408

• Fix ColumnType.DatabaseTypeName for mediumint unsigned by @evanelias in #1428

• Add connection attributes by @Daemonxiao in #1389

• Stop ColumnTypeScanType() from returning sql.RawBytes by @methane in #1424

• Exec() now provides access to status of multiple statements. by @mherr-google in #1309

• Allow to change (or disable) the default driver name for registration by @dolmen in #1499

• Add default connection attribute '_server_host' by @oblitorum in #1506

• QueryUnescape DSN ConnectionAttribute value by @zhangyangyu in #1470

• Add client_ed25519 authentication by @Gusted in #1518

• Reduced allocation on connection.go by @EPuncker in #1421

• Avoid panic in TestRowsColumnTypes by @wayyoungboy in #1426

• Add benchmark to receive massive rows. by @methane in #1415

• README: Update multistatement by @methane in #1431

• all: replace ioutil pkg to new package by @uji in #1438

• chore: code optimization by @testwill in #1439

• Reduce map lookup in ColumnTypeDatabaseTypeName. by @methane in #1436

• doc: add link to NewConnector from FormatDSN by @dolmen in #1442

• Add fuzz test for ParseDSN / FormatDSN roundtrip by @dolmen in #1444

• TestDSNReformat: add more roundtrip checks by @dolmen in #1443

• tcp: handle errors returned by SetKeepAlive by @achille-roussel in #1448

• use staticcheck by @methane in #1449

• Add Daemonxiao to AUTHORS by @Daemonxiao in #1459

• Update link about LOAD DATA LOCAL in README.md by @i7a7467 in #1468

• Update README.md by @Netzer7 in #1464

• add Go 1.21 and MySQL 8.1 to the build matrix by @shogo82148 in #1472

• Improve DSN docstsrings by @golddranks in #1475

• Fix #1478 remove length check by @ShenFeng312 in #1481

• README: fix markup error by @methane in #1480

• Close connection on ErrPktSync and ErrPktSyncMul by @owbone in #1473

• Spelling, grammar, and link fixes by @scop in #1485

• Make use of strings.Cut by @scop in #1486

• move stale connection check to ResetSession() by @methane in #1496

• fix race condition of TestConcurrent by @shogo82148 in #1490

• mark fail, mustExec and mustQuery as test helpers by @shogo82148 in #1488

• Remove obsolete fuzz.go #1445 by @dolmen in #1498

• testing: expose testing.TB in DBTest instead of full *testing.T by @dolmen in #1500

• symbol removed from installation command by @panvalkar1994 in #1510

• fix issue 1361 by @keeplearning20221 in #1462

• fix fragile test by @methane in #1522

• Fix sql.RawBytes corruption issue by @shogo82148 in #1523

• fix for enum and set field type to column type identifying by @jennifersp in #1520

• Parallelize test by @shogo82148 in #1525

• Fix unsigned int overflow by @shiyuhang0 in #1530

• Introduce timeTruncate parameter for time.Time arguments by @PauliusLozys in #1541

• add TiDB support in README.md by @crazycs520 in #1333

• Update workflows by @methane in #1547

New Contributors

• @EPuncker made their first contribution in #1421
• @jypelle made their first contribution in #1422
• @frozenbonito made their first contribution in #1408
• @wayyoungboy made their first contribution in #1426
• @evanelias made their first contribution in #1428
• @Daemonxiao made their first contribution in #1389
• @uji made their first contribution in #1438
• @testwill made their first contribution in #1439
• @i7a7467 made their first contribution in #1468
• @Netzer7 made their first contribution in #1464
• @golddranks made their first contribution in #1475
• @ShenFeng312 made their first contribution in #1481
• @owbone made their first contribution in #1473
• @scop made their first contribution in #1485
• @panvalkar1994 made their first contribution in #1510
• @zhangyangyu made their first contribution in #1470
• @keeplearning20221 made their first contribution in #1462
• @oblitorum made their first contribution in #1506
• @Gusted made their first contribution in #1518
• @jennifersp made their first contribution in #1520
• @shiyuhang0 made their first contribution in #1530
• @PauliusLozys made their first contribution in #1541
• @crazycs520 made their first contribution in #1333
• @ItalyPaleAle made their first contribution in #1469

Full Changelog: v1.7.1...v1.8.0

What's Changed

• bump actions/checkout@v3 and actions/setup-go@v3 by @shogo82148 in #1375
• Use SET syntax as specified in the MySQL documentation by @beautifulentropy in #1402
• Add go1.20 and mariadb10.11 to the testing matrix by @pgporada in #1403
• Increase default maxAllowedPacket size. by @methane in #1411
• Correct maxAllowedPacket default value mentioned in docs to match the… by @sjmudd in #1412
• fix some comments by @cuishuang in #1417
• Update changelog for version 1.7.1 by @methane in #1418

New Contributors

• @beautifulentropy made their first contribution in #1402
• @pgporada made their first contribution in #1403

Full Changelog: v1.7.0...v1.7.1

Changes:

• Drop support of Go 1.12 (#1211)
• Refactoring (*textRows).readRow in a more clear way (#1230)
• util: Reduce boundary check in escape functions. (#1316)
• enhancement for mysqlConn handleAuthResult (#1250)

New Features:

• support Is comparison on MySQLError (#1210)
• return unsigned in database type name when necessary (#1238)
• Add API to express like a --ssl-mode=PREFERRED MySQL client (#1370)
• Add SQLState to MySQLError (#1321)

Bugfixes:

• Fix parsing 0 year. (#1257)

Major Release

• Migrate the CI service from travis-ci to GitHub Actions (#1176, #1183, #1190)
• NullTime is deprecated (#960, #1144)
• Reduce allocations when building SET command (#1111)
• Performance improvement for time formatting (#1118)
• Performance improvement for time parsing (#1098, #1113)

See CHANGELOG.md for full details

Major Release

• Added Go Module support
• Dropped support for Go 1.9 and lower
• Implemented Connector interface
• Improved buffering
• Added connection liveness check
• Improved marking of bad connnections
• Updated collations and made utf8mb4 default
• Made mysql.NullTime compatible with sql.NullTime
• Removed support for CloudSQL via appengine/cloudsql

See CHANGELOG.md for full details