SQL拼接

todo

Field.Applay,Field.SetDelayApply,Field.SetScene 需要梳理重新定义，目前比较混乱现状: Field.Apply 立即执行 Field.SetDelayApply 构造SQL语句前执行 Field.sceneFns (Field.SceneInsert,Field.SceneSave,Field.SceneUpdate,Field.SceneSelect,Field.SceneInit,SceneFinal)获取值时执行

3个函数的入参签名完全一致，本质上是Field 需要支持分层设置(和value 分层设置类似)

Name		Name	Last commit message	Last commit date
Latest commit History 509 Commits
.gitignore		.gitignore
README.md		README.md
builder.go		builder.go
builder_sharded_table.go		builder_sharded_table.go
builder_test.go		builder_test.go
db.go		db.go
ddl.go		ddl.go
ddl_test.go		ddl_test.go
field.go		field.go
field_test.go		field_test.go
go.mod		go.mod
go.sum		go.sum
handler.go		handler.go
handler_db.go		handler_db.go
handler_test.go		handler_test.go
mesage.go		mesage.go
middleware.go		middleware.go
middleware_test.go		middleware_test.go
model_middleware.go		model_middleware.go
repository.go		repository.go
schema.go		schema.go
table.go		table.go

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