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/util/stringx/string_test.go

@@ -0,0 +1,42 @@
+package stringx
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestString_IsEmptyOrSpace(t *testing.T) {
+	ret := From("  ").IsEmptyOrSpace()
+	assert.Equal(t, true, ret)
+	ret2 := From("ll??").IsEmptyOrSpace()
+	assert.Equal(t, false, ret2)
+	ret3 := From(`
+   		`).IsEmptyOrSpace()
+	assert.Equal(t, true, ret3)
+}
+
+func TestString_Snake2Camel(t *testing.T) {
+	ret := From("____this_is_snake").Snake2Camel()
+	assert.Equal(t, "ThisIsSnake", ret)
+
+	ret2 := From("测试_test_Data").Snake2Camel()
+	assert.Equal(t, "测试TestData", ret2)
+
+	ret3 := From("___").Snake2Camel()
+	assert.Equal(t, "", ret3)
+
+	ret4 := From("testData_").Snake2Camel()
+	assert.Equal(t, "TestData", ret4)
+
+	ret5 := From("testDataTestData").Snake2Camel()
+	assert.Equal(t, "TestDataTestData", ret5)
+}
+
+func TestString_Camel2Snake(t *testing.T) {
+	ret := From("ThisIsCCCamel").Camel2Snake()
+	assert.Equal(t, "this_is_c_c_camel", ret)
+
+	ret2 := From("测试Test_Data_test_data").Camel2Snake()
+	assert.Equal(t, "测试_test__data_test_data", ret2)
+}