add bookstore example

example/bookstore/rpc/check/internal/svc/servicecontext.go

@@ -0,0 +1,20 @@
+package svc
+
+import (
+	"bookstore/rpc/check/internal/config"
+	"bookstore/rpc/model"
+
+	"github.com/tal-tech/go-zero/core/stores/sqlx"
+)
+
+type ServiceContext struct {
+	c     config.Config
+	Model *model.BookModel
+}
+
+func NewServiceContext(c config.Config) *ServiceContext {
+	return &ServiceContext{
+		c:             c,
+		Model: model.NewBookModel(sqlx.NewMysql(c.DataSource), c.Cache, c.Table),
+	}
+}