fix golint issues, else blocks (#457)

tools/goctl/model/sql/parser/error.go

@@ -5,7 +5,7 @@ import (
 )
 
 var (
-	unSupportDDL        = errors.New("unexpected type")
-	tableBodyIsNotFound = errors.New("create table spec not found")
-	errPrimaryKey       = errors.New("unexpected join primary key")
+	errUnsupportDDL      = errors.New("unexpected type")
+	errTableBodyNotFound = errors.New("create table spec not found")
+	errPrimaryKey        = errors.New("unexpected join primary key")
 )

tools/goctl/model/sql/parser/parser.go

@@ -52,7 +52,7 @@ func Parse(ddl string) (*Table, error) {
 
 	ddlStmt, ok := stmt.(*sqlparser.DDL)
 	if !ok {
-		return nil, unSupportDDL
+		return nil, errUnsupportDDL
 	}
 
 	action := ddlStmt.Action
@@ -63,7 +63,7 @@ func Parse(ddl string) (*Table, error) {
 	tableName := ddlStmt.NewName.Name.String()
 	tableSpec := ddlStmt.TableSpec
 	if tableSpec == nil {
-		return nil, tableBodyIsNotFound
+		return nil, errTableBodyNotFound
 	}
 
 	columns := tableSpec.Columns

tools/goctl/model/sql/parser/parser_test.go

@@ -14,7 +14,7 @@ func TestParsePlainText(t *testing.T) {
 
 func TestParseSelect(t *testing.T) {
 	_, err := Parse("select * from user")
-	assert.Equal(t, unSupportDDL, err)
+	assert.Equal(t, errUnsupportDDL, err)
 }
 
 func TestParseCreateTable(t *testing.T) {