Drop support of Go 1.12 (#1211)

* Drop support of Go 1.12

* bump Go version in go.mod

* remove nulltime_legacy

.github/workflows/test.yml

@@ -27,8 +27,6 @@ jobs:
               '1.15',
               '1.14',
               '1.13',
-              '1.12',
-              '1.11',
           ]
           mysql = [
               '8.0',

README.md

@@ -40,7 +40,7 @@ A MySQL-Driver for Go's [database/sql](https://golang.org/pkg/database/sql/) pac
   * Optional placeholder interpolation
 
 ## Requirements
-  * Go 1.10 or higher. We aim to support the 3 latest versions of Go.
+  * Go 1.13 or higher. We aim to support the 3 latest versions of Go.
   * MySQL (4.1+), MariaDB, Percona Server, Google CloudSQL or Sphinx (2.2.3+)
 
 ---------------------------------------

driver_test.go

@@ -2771,13 +2771,13 @@ func TestRowsColumnTypes(t *testing.T) {
 	nfNULL := sql.NullFloat64{Float64: 0.0, Valid: false}
 	nf0 := sql.NullFloat64{Float64: 0.0, Valid: true}
 	nf1337 := sql.NullFloat64{Float64: 13.37, Valid: true}
-	nt0 := nullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 0, time.UTC), Valid: true}
-	nt1 := nullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 100000000, time.UTC), Valid: true}
-	nt2 := nullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 110000000, time.UTC), Valid: true}
-	nt6 := nullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 111111000, time.UTC), Valid: true}
-	nd1 := nullTime{Time: time.Date(2006, 01, 02, 0, 0, 0, 0, time.UTC), Valid: true}
-	nd2 := nullTime{Time: time.Date(2006, 03, 04, 0, 0, 0, 0, time.UTC), Valid: true}
-	ndNULL := nullTime{Time: time.Time{}, Valid: false}
+	nt0 := sql.NullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 0, time.UTC), Valid: true}
+	nt1 := sql.NullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 100000000, time.UTC), Valid: true}
+	nt2 := sql.NullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 110000000, time.UTC), Valid: true}
+	nt6 := sql.NullTime{Time: time.Date(2006, 01, 02, 15, 04, 05, 111111000, time.UTC), Valid: true}
+	nd1 := sql.NullTime{Time: time.Date(2006, 01, 02, 0, 0, 0, 0, time.UTC), Valid: true}
+	nd2 := sql.NullTime{Time: time.Date(2006, 03, 04, 0, 0, 0, 0, time.UTC), Valid: true}
+	ndNULL := sql.NullTime{Time: time.Time{}, Valid: false}
 	rbNULL := sql.RawBytes(nil)
 	rb0 := sql.RawBytes("0")
 	rb42 := sql.RawBytes("42")

fields.go

@@ -106,7 +106,7 @@ var (
 	scanTypeInt64     = reflect.TypeOf(int64(0))
 	scanTypeNullFloat = reflect.TypeOf(sql.NullFloat64{})
 	scanTypeNullInt   = reflect.TypeOf(sql.NullInt64{})
-	scanTypeNullTime  = reflect.TypeOf(nullTime{})
+	scanTypeNullTime  = reflect.TypeOf(sql.NullTime{})
 	scanTypeUint8     = reflect.TypeOf(uint8(0))
 	scanTypeUint16    = reflect.TypeOf(uint16(0))
 	scanTypeUint32    = reflect.TypeOf(uint32(0))

go.mod

@@ -1,3 +1,3 @@
 module github.com/go-sql-driver/mysql
 
-go 1.10
+go 1.13

nulltime.go

@@ -9,11 +9,32 @@
 package mysql
 
 import (
+	"database/sql"
 	"database/sql/driver"
 	"fmt"
 	"time"
 )
 
+// NullTime represents a time.Time that may be NULL.
+// NullTime implements the Scanner interface so
+// it can be used as a scan destination:
+//
+//  var nt NullTime
+//  err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt)
+//  ...
+//  if nt.Valid {
+//     // use nt.Time
+//  } else {
+//     // NULL value
+//  }
+//
+// This NullTime implementation is not driver-specific
+//
+// Deprecated: NullTime doesn't honor the loc DSN parameter.
+// NullTime.Scan interprets a time as UTC, not the loc DSN parameter.
+// Use sql.NullTime instead.
+type NullTime sql.NullTime
+
 // Scan implements the Scanner interface.
 // The value type must be time.Time or string / []byte (formatted time-string),
 // otherwise Scan fails.