support enum type for mysql

Signed-off-by: 商讯在线 <swhbox@foxmail.com>

column.go

@@ -31,11 +31,30 @@ type Column struct {
 	IsVersion       bool
 	fieldPath       []string
 	DefaultIsEmpty  bool
+	EnumOptions     map[string]int
 }
 
 func NewColumn(name, fieldName string, sqlType SQLType, len1, len2 int, nullable bool) *Column {
-	return &Column{name, fieldName, sqlType, len1, len2, nullable, "", make(map[string]bool), false, false,
-		TWOSIDES, false, false, false, false, nil, false}
+	return &Column{
+		Name:            name,
+		FieldName:       fieldName,
+		SQLType:         sqlType,
+		Length:          len1,
+		Length2:         len2,
+		Nullable:        nullable,
+		Default:         "",
+		Indexes:         make(map[string]bool),
+		IsPrimaryKey:    false,
+		IsAutoIncrement: false,
+		MapType:         TWOSIDES,
+		IsCreated:       false,
+		IsUpdated:       false,
+		IsCascade:       false,
+		IsVersion:       false,
+		fieldPath:       nil,
+		DefaultIsEmpty:  false,
+		EnumOptions:     make(map[string]int),
+	}
 }
 
 // generate column description string according dialect

type.go

@@ -62,6 +62,7 @@ var (
 	Integer   = "INTEGER"
 	BigInt    = "BIGINT"
 
+	Enum       = "ENUM"
 	Char       = "CHAR"
 	Varchar    = "VARCHAR"
 	TinyText   = "TINYTEXT"
@@ -104,6 +105,7 @@ var (
 		Integer:   NUMERIC_TYPE,
 		BigInt:    NUMERIC_TYPE,
 
+		Enum:       TEXT_TYPE,
 		Char:       TEXT_TYPE,
 		Varchar:    TEXT_TYPE,
 		TinyText:   TEXT_TYPE,
@@ -293,7 +295,7 @@ func SQLType2Type(st SQLType) reflect.Type {
 		return reflect.TypeOf(float32(1))
 	case Double:
 		return reflect.TypeOf(float64(1))
-	case Char, Varchar, TinyText, Text, MediumText, LongText:
+	case Char, Varchar, TinyText, Text, MediumText, LongText, Enum:
 		return reflect.TypeOf("")
 	case TinyBlob, Blob, LongBlob, Bytea, Binary, MediumBlob, VarBinary:
 		return reflect.TypeOf([]byte{})