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/gen/imports.go

@@ -1,23 +1,13 @@
 package gen
 
 import (
-	"bytes"
-	"text/template"
-
-	sqltemplate "github.com/tal-tech/go-zero/tools/goctl/model/sql/template"
+	"github.com/tal-tech/go-zero/tools/goctl/model/sql/template"
 )
 
-func genImports(table *InnerTable) (string, error) {
-	t, err := template.New("imports").Parse(sqltemplate.Imports)
-	if err != nil {
-		return "", err
+func genImports(withCache bool) string {
+	if withCache {
+		return template.Imports
+	} else {
+		return template.ImportsNoCache
 	}
-	importBuffer := new(bytes.Buffer)
-	err = t.Execute(importBuffer, map[string]interface{}{
-		"containsCache": table.ContainsCache,
-	})
-	if err != nil {
-		return "", err
-	}
-	return importBuffer.String(), nil
 }