patch model&rpc (#207)

* change column to read from information_schema

* reactor generate mode from datasource

* reactor generate mode from datasource

* add primary key check logic

* resolve rebase conflicts

* add naming style

* add filename test case

* resolve rebase conflicts

* reactor test

* add test case

* change shell script to makefile

* update rpc new

* update gen_test.go

* format code

* format code

* update test

* generates alias

tools/goctl/util/stringx/string.go

@@ -29,9 +29,11 @@ func (s String) IsEmptyOrSpace() bool {
 func (s String) Lower() string {
 	return strings.ToLower(s.source)
 }
+
 func (s String) Upper() string {
 	return strings.ToUpper(s.source)
 }
+
 func (s String) Title() string {
 	if s.IsEmptyOrSpace() {
 		return s.source