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go-kratos 学习笔记(6) 数据库gorm使用

news 来源：原创 2024/9/20 23:41:48

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 dataimport ("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 clientdb  *gorm.DBlog *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 serviceimport ("context""xgs_kratos/app/users/internal/biz"pb "xgs_kratos/gen/users"
)type UserService struct {pb.UnimplementedUserServeruc *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 bizimport ("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 UserRepolog  *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 daltype UserMo struct {Id    int64Age   int32Name  stringEmail string
}func (u *UserMo) TableName() string {return "users"
}

data/user.go

package dataimport ("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 *Datalog  *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.UserMores := r.data.db.Find(&results)if res.Error != nil {return nil, res.Error}var userDatas []*users.UserDatafor _, 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