go-kratos 学习笔记(6) 数据库gorm使用

news2024/9/21 10:59:36

数据库是项目的核心，数据库的链接数据是data层的操作，选择了比较简单好用的gorm作为数据库的工具；之前是PHP开发，各种框架都是orm的操作；gorm还是很相似的，使用起来比较顺手

go-kratos官网的实例是ent，功能是很强大，操作稍微复杂点

gorm的官方文档 https://gorm.io/zh_CN/docs/index.html

使用

go get -u gorm.io/gorm
go get -u gorm.io/driver/mysql

照葫芦画瓢先画起来再说

data.go 把数据库的链接放到NewData方法里面

package data

import (
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"xgs_kratos/gen/config/users"

	"github.com/go-kratos/kratos/v2/log"
	"github.com/google/wire"
)

// ProviderSet is data providers.
var ProviderSet = wire.NewSet(NewData, NewUserRepo, CreateRegister)

// Data .
type Data struct {
	// TODO wrapped database client
	db  *gorm.DB
	log *log.Helper
}

// NewData .
func NewData(c *conf.Data, logger log.Logger) (*Data, func(), error) {
	cleanup := func() {
		log.NewHelper(logger).Info("closing the data resources")
	}
	db, err := gorm.Open(mysql.Open(c.Database.Source), &gorm.Config{})
	if err != nil {
		log.Fatalf("failed to connect database: %v", err)
		panic(err)
	}
	return &Data{
		db:  db,
		log: log.NewHelper(logger),
	}, cleanup, nil
}

user.proto加2个http的方法 ListUser 和 CreateUser

syntax = "proto3";

package gen.users;
import "google/api/annotations.proto";

option go_package = "xgs_kratos/gen/users;users";
option java_multiple_files = true;
option java_package = "api.users";

service User {
	rpc CreateUser (CreateUserRequest) returns (CreateUserReply){
		option (google.api.http) = {
			post: "/CreateUser",
			body: "*",
		};
	};
	rpc UpdateUser (UpdateUserRequest) returns (UpdateUserReply);
	rpc DeleteUser (DeleteUserRequest) returns (DeleteUserReply);
	rpc GetUser (GetUserRequest) returns (GetUserReply);
	rpc ListUser (ListUserRequest) returns (ListUserReply){
		option (google.api.http) = {
			get: "/ListUser",
		};
	};
}

message CreateUserRequest {
	string name = 1;
	string email = 2;
	int32 age = 3;
}
message CreateUserReply {
	int64 id = 1;
}

message UpdateUserRequest {}
message UpdateUserReply {}

message DeleteUserRequest {}
message DeleteUserReply {}

message GetUserRequest {}
message GetUserReply {}

message ListUserRequest {}
message UserData {
	int64 id = 1;
	string name = 2;
	string email = 3;
	int32 age = 4;
}
message ListUserReply {
	repeated UserData users = 1;
}

需要再biz业务层和data数据层实现

service/user.go

package service

import (
	"context"
	"xgs_kratos/app/users/internal/biz"

	pb "xgs_kratos/gen/users"
)

type UserService struct {
	pb.UnimplementedUserServer
	uc *biz.UserUsecase
}

func NewUserService(uc *biz.UserUsecase) *UserService {
	return &UserService{
		uc: uc,
	}
}

func (s *UserService) CreateUser(ctx context.Context, req *pb.CreateUserRequest) (*pb.CreateUserReply, error) {
	user, err := s.uc.CreateUser(ctx, req)
	if err != nil {
		return nil, err

	}
	return user, nil
}

//	func (s *UserService) UpdateUser(ctx context.Context, req *pb.UpdateUserRequest) (*pb.UpdateUserReply, error) {
//		return &pb.UpdateUserReply{}, nil
//	}
//
//	func (s *UserService) DeleteUser(ctx context.Context, req *pb.DeleteUserRequest) (*pb.DeleteUserReply, error) {
//		return &pb.DeleteUserReply{}, nil
//	}
//
//	func (s *UserService) GetUser(ctx context.Context, req *pb.GetUserRequest) (*pb.GetUserReply, error) {
//		return &pb.GetUserReply{}, nil
//	}
func (s *UserService) ListUser(ctx context.Context, req *pb.ListUserRequest) (*pb.ListUserReply, error) {
	user, err := s.uc.ListUser(ctx, req)
	if err != nil {
		return nil, err

	}
	return &pb.ListUserReply{
		Users: user,
	}, nil
}

biz/user.go

package biz

import (
	"context"
	"github.com/go-kratos/kratos/v2/log"
	"xgs_kratos/gen/users"
)

type User struct {
}

// UserRepo 定义数据仓库接口
type UserRepo interface {
	CreateUser(ctx context.Context, req *users.CreateUserRequest) (*users.CreateUserReply, error)
	ListUser(ctx context.Context, req *users.ListUserRequest) ([]*users.UserData, error)
}

// UserUsecase 定义业务逻辑
type UserUsecase struct {
	repo UserRepo
	log  *log.Helper
}

// NewUsecase 创建Usecase
func NewUserUsecase(repo UserRepo, logger log.Logger) *UserUsecase {
	return &UserUsecase{repo: repo, log: log.NewHelper(logger)}
}

// CreateUser 创建用户
func (uc *UserUsecase) CreateUser(ctx context.Context, req *users.CreateUserRequest) (*users.CreateUserReply, error) {
	return uc.repo.CreateUser(ctx, req)
}

// ListUser 获取用户列表
func (uc *UserUsecase) ListUser(ctx context.Context, req *users.ListUserRequest) ([]*users.UserData, error) {
	return uc.repo.ListUser(ctx, req)
}

我把数据表的模型放到了data/dal目录下了 app/users/internal/data/dal/user.go

package dal

type UserMo struct {
	Id    int64
	Age   int32
	Name  string
	Email string
}

func (u *UserMo) TableName() string {
	return "users"
}

data/user.go

package data

import (
	"context"
	"github.com/go-kratos/kratos/v2/log"
	"xgs_kratos/app/users/internal/biz"
	"xgs_kratos/app/users/internal/data/dal"
	"xgs_kratos/gen/users"
)

//data 层处理数据的存储和读取

type userRepo struct {
	data *Data
	log  *log.Helper
}

// NewUserRepo .
func NewUserRepo(data *Data, logger log.Logger) biz.UserRepo {
	return &userRepo{
		data: data,
		log:  log.NewHelper(logger),
	}
}

// CreateUser 创建用户
func (r *userRepo) CreateUser(ctx context.Context, req *users.CreateUserRequest) (*users.CreateUserReply, error) {
	user := dal.UserMo{
		Age:   req.Age,
		Name:  req.Name,
		Email: req.Email,
	}
	result := r.data.db.Create(&user)
	if result.Error != nil {
		return nil, result.Error
	}
	return &users.CreateUserReply{
		Id: user.Id,
	}, nil
}

func (r *userRepo) ListUser(ctx context.Context, req *users.ListUserRequest) ([]*users.UserData, error) {
	var results []dal.UserMo
	res := r.data.db.Find(&results)
	if res.Error != nil {
		return nil, res.Error
	}

	var userDatas []*users.UserData
	for _, result := range results {
		userDatas = append(userDatas, &users.UserData{
			Id:    result.Id,
			Name:  result.Name,
			Age:   result.Age,
			Email: result.Email,
		})
	}
	return userDatas, nil
}

根目录下执行 buf generate