add bookstore example

example/bookstore/rpc/check/internal/logic/checklogic.go

@@ -0,0 +1,35 @@
+package logic
+
+import (
+	"bookstore/rpc/check/internal/svc"
+	check "bookstore/rpc/check/pb"
+	"context"
+
+	"github.com/tal-tech/go-zero/core/logx"
+)
+
+type CheckLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewCheckLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CheckLogic {
+	return &CheckLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *CheckLogic) Check(in *check.CheckReq) (*check.CheckResp, error) {
+	resp, err := l.svcCtx.Model.FindOne(in.Book)
+	if err != nil {
+		return nil, err
+	}
+
+	return &check.CheckResp{
+		Found: true,
+		Price: resp.Price,
+	}, nil
+}