use staticcheck

.github/workflows/test.yml

@@ -11,6 +11,12 @@ env:
   MYSQL_TEST_CONCURRENT: 1
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dominikh/staticcheck-action@v1.3.0
+
   list:
     runs-on: ubuntu-latest
     outputs:

auth.go

@@ -382,7 +382,7 @@ func (mc *mysqlConn) handleAuthResult(oldAuthData []byte, plugin string) error {
 						// parse public key
 						block, rest := pem.Decode(data[1:])
 						if block == nil {
-							return fmt.Errorf("No Pem data found, data: %s", rest)
+							return fmt.Errorf("no pem data found, data: %s", rest)
 						}
 						pkix, err := x509.ParsePKIXPublicKey(block.Bytes)
 						if err != nil {

driver.go

@@ -60,9 +60,7 @@ func DeregisterDialContext(net string) {
 	dialsLock.Lock()
 	defer dialsLock.Unlock()
 	if dials != nil {
-		if _, ok := dials[net]; ok {
-			delete(dials, net)
-		}
+		delete(dials, net)
 	}
 }
 

driver_test.go

@@ -347,8 +347,8 @@ func TestMultiQuery(t *testing.T) {
 		rows := dbt.mustQuery("SELECT value FROM test WHERE id=1;")
 		if rows.Next() {
 			rows.Scan(&out)
-			if 5 != out {
-				dbt.Errorf("5 != %d", out)
+			if out != 5 {
+				dbt.Errorf("expected 5, got %d", out)
 			}
 
 			if rows.Next() {
@@ -1402,6 +1402,7 @@ func TestReuseClosedConnection(t *testing.T) {
 	if err != nil {
 		t.Fatalf("error preparing statement: %s", err.Error())
 	}
+	//lint:ignore SA1019 this is a test
 	_, err = stmt.Exec(nil)
 	if err != nil {
 		t.Fatalf("error executing statement: %s", err.Error())
@@ -1416,6 +1417,7 @@ func TestReuseClosedConnection(t *testing.T) {
 			t.Errorf("panic after reusing a closed connection: %v", err)
 		}
 	}()
+	//lint:ignore SA1019 this is a test
 	_, err = stmt.Exec(nil)
 	if err != nil && err != driver.ErrBadConn {
 		t.Errorf("unexpected error '%s', expected '%s'",

errors.go

@@ -21,7 +21,7 @@ var (
 	ErrMalformPkt        = errors.New("malformed packet")
 	ErrNoTLS             = errors.New("TLS requested but server does not support TLS")
 	ErrCleartextPassword = errors.New("this user requires clear text authentication. If you still want to use it, please add 'allowCleartextPasswords=1' to your DSN")
-	ErrNativePassword    = errors.New("this user requires mysql native password authentication.")
+	ErrNativePassword    = errors.New("this user requires mysql native password authentication")
 	ErrOldPassword       = errors.New("this user requires old password authentication. If you still want to use it, please add 'allowOldPasswords=1' to your DSN. See also https://github.com/go-sql-driver/mysql/wiki/old_passwords")
 	ErrUnknownPlugin     = errors.New("this authentication plugin is not supported")
 	ErrOldProtocol       = errors.New("MySQL server does not support required protocol 41+")

infile.go

@@ -116,10 +116,10 @@ func (mc *mysqlConn) handleInFileRequest(name string) (err error) {
 					defer deferredClose(&err, cl)
 				}
 			} else {
-				err = fmt.Errorf("Reader '%s' is <nil>", name)
+				err = fmt.Errorf("reader '%s' is <nil>", name)
 			}
 		} else {
-			err = fmt.Errorf("Reader '%s' is not registered", name)
+			err = fmt.Errorf("reader '%s' is not registered", name)
 		}
 	} else { // File
 		name = strings.Trim(name, `"`)

nulltime.go

@@ -59,7 +59,7 @@ func (nt *NullTime) Scan(value interface{}) (err error) {
 	}
 
 	nt.Valid = false
-	return fmt.Errorf("Can't convert %T to time.Time", value)
+	return fmt.Errorf("can't convert %T to time.Time", value)
 }
 
 // Value implements the driver Valuer interface.