pass unsigned int as it is without converting it to string

connection_test.go

@@ -75,7 +75,7 @@ func TestCheckNamedValue(t *testing.T) {
 		t.Fatal("uint64 high-bit not convertible", err)
 	}
 
-	if value.Value != "18446744073709551615" {
-		t.Fatalf("uint64 high-bit not converted, got %#v %T", value.Value, value.Value)
+	if value.Value != ^uint64(0) {
+		t.Fatalf("uint64 high-bit converted, got %#v %T", value.Value, value.Value)
 	}
 }

packets.go

@@ -999,6 +999,22 @@ func (stmt *mysqlStmt) writeExecutePacket(args []driver.Value) error {
 					)
 				}
 
+			case uint64:
+				paramTypes[i+i] = byte(fieldTypeLongLong)
+				paramTypes[i+i+1] = 0x80 // type is unsigned
+
+				if cap(paramValues)-len(paramValues)-8 >= 0 {
+					paramValues = paramValues[:len(paramValues)+8]
+					binary.LittleEndian.PutUint64(
+						paramValues[len(paramValues)-8:],
+						uint64(v),
+					)
+				} else {
+					paramValues = append(paramValues,
+						uint64ToBytes(uint64(v))...,
+					)
+				}
+
 			case float64:
 				paramTypes[i+i] = byte(fieldTypeDouble)
 				paramTypes[i+i+1] = 0x00

statement.go

@@ -13,7 +13,6 @@ import (
 	"fmt"
 	"io"
 	"reflect"
-	"strconv"
 )
 
 type mysqlStmt struct {
@@ -169,7 +168,7 @@ func (c converter) ConvertValue(v interface{}) (driver.Value, error) {
 	case reflect.Uint64:
 		u64 := rv.Uint()
 		if u64 >= 1<<63 {
-			return strconv.FormatUint(u64, 10), nil
+			return u64, nil
 		}
 		return int64(u64), nil
 	case reflect.Float32, reflect.Float64:

statement_test.go

@@ -120,7 +120,7 @@ func TestConvertUnsignedIntegers(t *testing.T) {
 		t.Fatal("uint64 high-bit not convertible", err)
 	}
 
-	if output != "18446744073709551615" {
-		t.Fatalf("uint64 high-bit not converted, got %#v %T", output, output)
+	if output != ^uint64(0) {
+		t.Fatalf("uint64 high-bit converted, got %#v %T", output, output)
 	}
 }