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/rpc/generator/naming.go

@@ -0,0 +1,24 @@
+package generator
+
+type NamingStyle = string
+
+const (
+	namingLower NamingStyle = "lower"
+	namingCamel NamingStyle = "camel"
+	namingSnake NamingStyle = "snake"
+)
+
+// IsNamingValid validates whether the namingStyle is valid or not,return
+// namingStyle and true if it is valid, or else return empty string
+// and false, and it is a valid value even namingStyle is empty string
+func IsNamingValid(namingStyle string) (NamingStyle, bool) {
+	if len(namingStyle) == 0 {
+		namingStyle = namingLower
+	}
+	switch namingStyle {
+	case namingLower, namingCamel, namingSnake:
+		return namingStyle, true
+	default:
+		return "", false
+	}
+}