goctl model reactor (#15)

* reactor sql generation

* reactor sql generation

* add console & example

* optimize unit test & add document

* modify default config

* remove test file

* Revert "remove test file"

This reverts commit 81041f9e

* fix stringx.go & optimize example

* remove unused code

tools/goctl/model/sql/command/command.go

@@ -0,0 +1,26 @@
+package command
+
+import (
+	"github.com/tal-tech/go-zero/tools/goctl/model/sql/gen"
+	"github.com/tal-tech/go-zero/tools/goctl/util/console"
+	"github.com/urfave/cli"
+)
+
+func Mysql(ctx *cli.Context) error {
+	src := ctx.String("src")
+	dir := ctx.String("dir")
+	cache := ctx.Bool("cache")
+	idea := ctx.Bool("idea")
+	var log console.Console
+	if idea {
+		log = console.NewIdeaConsole()
+	} else {
+		log = console.NewColorConsole()
+	}
+	generator := gen.NewDefaultGenerator(src, dir, gen.WithConsoleOption(log))
+	err := generator.Start(cache)
+	if err != nil {
+		log.Error("%v", err)
+	}
+	return nil
+}