Add support for sql null types

base.go

@@ -1,6 +1,7 @@
 package hood
 
 import (
+	"database/sql"
 	"fmt"
 	"reflect"
 	"strings"
@@ -67,6 +68,21 @@ func (d *base) SetModelValue(driverValue, fieldValue reflect.Value) error {
 			} else {
 				panic(fmt.Sprintf("cannot set created value %T", driverValue.Elem().Interface()))
 			}
+		} else if fieldType == reflect.TypeOf(sql.NullBool{}) {
+			if b, ok := driverValue.Elem().Interface().(bool); ok {
+				fieldValue.Set(reflect.ValueOf(sql.NullBool{b, true}))
+			}
+		} else if fieldType == reflect.TypeOf(sql.NullFloat64{}) {
+			if f, ok := driverValue.Elem().Interface().(float64); ok {
+				fieldValue.Set(reflect.ValueOf(sql.NullFloat64{f, true}))
+			}
+		} else if fieldType == reflect.TypeOf(sql.NullInt64{}) {
+			if i, ok := driverValue.Elem().Interface().(int64); ok {
+				fieldValue.Set(reflect.ValueOf(sql.NullInt64{i, true}))
+			}
+		} else if fieldType == reflect.TypeOf(sql.NullString{}) {
+			str := string(driverValue.Elem().Bytes())
+			fieldValue.Set(reflect.ValueOf(sql.NullString{str, true}))
 		}
 	}
 	return nil

mysql.go

@@ -1,6 +1,7 @@
 package hood
 
 import (
+	"database/sql"
 	"fmt"
 	"reflect"
 	"time"
@@ -38,20 +39,20 @@ func (d *mysql) SqlType(f interface{}, size int) string {
 		return "bigint"
 	case time.Time, Created, Updated:
 		return "timestamp"
-	case bool:
+	case bool, sql.NullBool:
 		return "boolean"
 	case int, int8, int16, int32, uint, uint8, uint16, uint32:
 		return "int"
-	case int64, uint64:
+	case int64, uint64, sql.NullInt64:
 		return "bigint"
-	case float32, float64:
+	case float32, float64, sql.NullFloat64:
 		return "double"
 	case []byte:
 		if size > 0 && size < 65532 {
 			return fmt.Sprintf("varbinary(%d)", size)
 		}
 		return "longblob"
-	case string:
+	case string, sql.NullString:
 		if size > 0 && size < 65532 {
 			return fmt.Sprintf("varchar(%d)", size)
 		}

postgres.go

@@ -1,6 +1,7 @@
 package hood
 
 import (
+	"database/sql"
 	"fmt"
 	_ "github.com/lib/pq"
 	"strings"
@@ -27,17 +28,17 @@ func (d *postgres) SqlType(f interface{}, size int) string {
 		return "bigserial"
 	case time.Time, Created, Updated:
 		return "timestamp with time zone"
-	case bool:
+	case bool, sql.NullBool:
 		return "boolean"
 	case int, int8, int16, int32, uint, uint8, uint16, uint32:
 		return "integer"
-	case int64, uint64:
+	case int64, uint64, sql.NullInt64:
 		return "bigint"
-	case float32, float64:
+	case float32, float64, sql.NullFloat64:
 		return "double precision"
 	case []byte:
 		return "bytea"
-	case string:
+	case string, sql.NullString:
 		if size > 0 && size < 65532 {
 			return fmt.Sprintf("varchar(%d)", size)
 		}