前言
隔壁组的云计算零零后女同事，后文简称 云女士 ，非说 Go 的 Gin 框架比 Springboot 更加的开箱即用，我心想在 Java 里面 Springboot 已经打遍天下无敌手，这份底蕴岂是 Gin 能比。
但是云女士突出一个执拗，非我要 PK 一把， PK 内容就是她使用 Gin，而我使用 Springboot 快速搭建一个简单的 Crud 工程，最后让其他同事来评判哪个更开箱即用。我毫不犹豫就答应了，作为搭建 Springboot 学习工程的资深 Crud 选手，咱这份底气还是有的。
云女士选择使用 Gin + Gorm 来搭建，而我原本想选择 Springboot + MyBatis，后面转念一想，这 MyBatis 要写 XML 文件，指不定就因为这个被云女士嘲笑了，所以我把 MyBatis 替换为了 MyBatis-Plus，这就足够的简洁了吧。
正文
准备事项
既然是 Crud 工程，自然要准备好操作的表，我和云女士通过如下语句在各自的数据库中创建好了如下两张表。
CREATE TABLE people (id INT(11) PRIMARY KEY AUTO_INCREMENT,p_name VARCHAR(255) NOT NULL,p_age INT(11) NOT NULL
)CREATE TABLE book (id INT(11) PRIMARY KEY AUTO_INCREMENT,b_name VARCHAR(255) NOT NULL,b_price FLOAT NOT NULL
)
Gin快速搭建Crud工程
云女士的工程结构如下所示。
云女士的 go.mod 文件内容如下所示。
module gobasego 1.17require (github.com/gin-gonic/gin v1.6.0github.com/jinzhu/gorm v1.9.16github.com/sirupsen/logrus v1.9.3github.com/spf13/cast v1.5.1
)
云女士定义了两个结构体作为模型（ Model ），book.go 文件内容如下所示。
package modelconst (BookTableName = "book"
)type Book struct {ID int64 `gorm:"column:id"`BookName string `gorm:"column:b_name"`BookPrice float64 `gorm:"column:b_price"`
}func (b *Book) TableName() string {return BookTableName
}
people.go 文件内容如下所示。
package modelconst (PeopleTableName = "people"
)type People struct {ID int64 `gorm:"column:id"`PeopleName string `gorm:"column:p_name"`PeopleAge int64 `gorm:"column:p_age"`
}func (p *People) TableName() string {return PeopleTableName
}
云女士补充道，TableName()方法是为模型指定对应的表名。
云女士为 book 表和 people 表分别定义了 Dao 接口，dao.go 文件内容如下所示。
package daoimport "gobase/model"type BookDao interface {AddBook(book *model.Book) errorUpdateBook(book *model.Book) errorDeleteBook(book *model.Book) errorListBookById(id uint) (*model.Book, error)
}type PeopleDao interface {AddPeople(book *model.People) errorUpdatePeople(book *model.People) errorDeletePeople(book *model.People) errorListPeopleById(id uint) (*model.People, error)
}
BookDao 接口对应的实现在book_dao_impl.go文件中，实现如下。
package daoimport ("github.com/jinzhu/gorm""gobase/model"
)type BookDaoImpl struct {DB *gorm.DB
}func (b *BookDaoImpl) AddBook(book *model.Book) error {if createResult := b.DB.Create(book); createResult.Error != nil {return createResult.Error}return nil
}func (b *BookDaoImpl) UpdateBook(book *model.Book) error {if saveResult := b.DB.Save(book); saveResult.Error != nil {return saveResult.Error}return nil
}func (b *BookDaoImpl) DeleteBook(book *model.Book) error {if deleteResult := b.DB.Delete(book); deleteResult.Error != nil {return deleteResult.Error}return nil
}func (b *BookDaoImpl) ListBookById(id uint) (*model.Book, error) {var book model.Bookif listResult := b.DB.Where("id = ?", id).First(&book); listResult.Error != nil {return nil, listResult.Error}return &book, nil
}
PeopleDao 接口对应的实现在people_dao_impl.go文件中，实现如下。
package daoimport ("github.com/jinzhu/gorm""gobase/model"
)type PeopleDaoImpl struct {DB *gorm.DB
}func (b *PeopleDaoImpl) AddPeople(people *model.People) error {if createResult := b.DB.Create(people); createResult.Error != nil {return createResult.Error}return nil
}func (b *PeopleDaoImpl) UpdatePeople(people *model.People) error {if saveResult := b.DB.Save(people); saveResult.Error != nil {return saveResult.Error}return nil
}func (b *PeopleDaoImpl) DeletePeople(people *model.People) error {if deleteResult := b.DB.Delete(people); deleteResult.Error != nil {return deleteResult.Error}return nil
}func (b *PeopleDaoImpl) ListPeopleById(id uint) (*model.People, error) {var people model.Peopleif listResult := b.DB.Where("id = ?", id).First(&people); listResult.Error != nil {return nil, listResult.Error}return &people, nil
}
要操作数据库，肯定需要数据库连接，云女士将数据库连接的管理实现在了mysql_connection_pool.go文件中，内容如下所示。
package mysqlimport ("fmt""github.com/jinzhu/gorm""gobase/dao""log""time"
)const (UserName = "root"PassWord = "root"Host = "192.168.101.8"Port = 3306Database = "gotest"MaxLifetime = 60 * time.SecondMaxIdletime = 30 * time.SecondMaxOpenconns = 6MaxIdleconns = 2Dialect = "mysql"
)type DataSouce struct {db *gorm.DB
}func NewDataSource() *DataSouce {var db *gorm.DBdsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8&parseTime=True&loc=Asia%%2FShanghai",UserName, PassWord, Host, Port, Database)db, err := gorm.Open(Dialect, dsn)if err != nil {log.Fatal(err.Error())}db.DB().SetConnMaxLifetime(MaxLifetime)db.DB().SetConnMaxIdleTime(MaxIdletime)db.DB().SetMaxOpenConns(MaxOpenconns)db.DB().SetMaxOpenConns(MaxIdleconns)return &DataSouce{db: db,}
}// BookDao 操作book表
func (d *DataSouce) BookDao() dao.BookDao {return &dao.BookDaoImpl{DB: d.db,}
}// PeopleDao 操作people表
func (d *DataSouce) PeopleDao() dao.PeopleDao {return &dao.PeopleDaoImpl{DB: d.db,}
}
云女士将路由写在了webservice.go文件中，内容如下。
package adapterimport ("github.com/gin-gonic/gin""gobase/mysql"
)func Init() error {dataSouce := mysql.NewDataSource()bookController := NewBookController(dataSouce)propleController := NewPropleController(dataSouce)engine := gin.Default()routerGroupBook := engine.Group("/book")routerGroupBook.POST("/add", bookController.AddBook)routerGroupBook.POST("/update", bookController.UpdateBook)routerGroupBook.POST("/delete", bookController.DeleteBook)routerGroupBook.POST("/list", bookController.ListBookById)routerGroupPeople := engine.Group("/people")routerGroupPeople.POST("/add", propleController.AddPeople)routerGroupPeople.POST("/update", propleController.UpdatePeople)routerGroupPeople.POST("/delete", propleController.DeletePeople)routerGroupPeople.POST("/list", propleController.ListPeopleById)return engine.Run()
}
其实除了绑定路由，云女士还在Init()函数中进行了简单的服务注入，也就是创建数据库连接池，然后将数据库连接池给到对应的 web 服务。
云女士将操作 book 表对应的 web 服务写在了book_controller.go文件中，其实现如下所示。
package adapterimport ("github.com/gin-gonic/gin""github.com/sirupsen/logrus""github.com/spf13/cast""gobase/model""gobase/mysql""net/http"
)type BookController struct {dataSource *mysql.DataSouce
}func NewBookController(dataSource *mysql.DataSouce) BookController {return BookController{dataSource: dataSource,}
}func (b *BookController) AddBook(ctx *gin.Context) {var book model.Bookif err := ctx.ShouldBind(&book); err != nil {logrus.Error("读取Book信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}bookDao := b.dataSource.BookDao()err := bookDao.AddBook(&book)if err != nil {logrus.Error("添加Book失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (b *BookController) UpdateBook(ctx *gin.Context) {var book model.Bookif err := ctx.ShouldBind(&book); err != nil {logrus.Error("读取Book信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}bookDao := b.dataSource.BookDao()err := bookDao.UpdateBook(&book)if err != nil {logrus.Error("更新Book失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (b *BookController) DeleteBook(ctx *gin.Context) {var book model.Bookif err := ctx.ShouldBind(&book); err != nil {logrus.Error("读取Book信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}bookDao := b.dataSource.BookDao()err := bookDao.DeleteBook(&book)if err != nil {logrus.Error("删除Book失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (b *BookController) ListBookById(ctx *gin.Context) {id := cast.ToUint(ctx.Query("id"))bookDao := b.dataSource.BookDao()book, err := bookDao.ListBookById(id)if err != nil {logrus.Error("查询Book失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, book)
}
云女士将操作 people 表对应的 web 服务写在了people_controller.go文件中，其实现如下所示。
package adapterimport ("github.com/gin-gonic/gin""github.com/sirupsen/logrus""github.com/spf13/cast""gobase/model""gobase/mysql""net/http"
)type PeopleController struct {dataSource *mysql.DataSouce
}func NewPropleController(dataSource *mysql.DataSouce) PeopleController {return PeopleController{dataSource: dataSource,}
}func (p *PeopleController) AddPeople(ctx *gin.Context) {var people model.Peopleif err := ctx.ShouldBind(&people); err != nil {logrus.Error("读取People信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}peopleDao := p.dataSource.PeopleDao()err := peopleDao.AddPeople(&people)if err != nil {logrus.Error("添加People失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (p *PeopleController) UpdatePeople(ctx *gin.Context) {var people model.Peopleif err := ctx.ShouldBind(&people); err != nil {logrus.Error("读取People信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}peopleDao := p.dataSource.PeopleDao()err := peopleDao.UpdatePeople(&people)if err != nil {logrus.Error("更新People失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (p *PeopleController) DeletePeople(ctx *gin.Context) {var people model.Peopleif err := ctx.ShouldBind(&people); err != nil {logrus.Error("读取People信息失败")ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}peopleDao := p.dataSource.PeopleDao()err := peopleDao.DeletePeople(&people)if err != nil {logrus.Error("删除People失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, gin.H{"message": "success",})
}func (p *PeopleController) ListPeopleById(ctx *gin.Context) {id := cast.ToUint(ctx.Query("id"))peopleDao := p.dataSource.PeopleDao()people, err := peopleDao.ListPeopleById(id)if err != nil {logrus.Error("查询People失败", err)ctx.JSON(http.StatusInternalServerError, gin.H{"message": "failed",})return}ctx.JSON(http.StatusOK, people)
}
最后，云女士简单的展示了一下对 book 表和 prople 表的 Crud 操作。
book 表和 people 表的增删改成功时返回内容如下所示。
book 表和 people 表的查询成功时返回内容如下所示。
Spring boot 快速搭建Crud工程
Spring Boot 基础就不介绍了
云女士基于 Gin 和 Gorm 搭建的 Crud 工程，我看完后内心扑哧一笑：不过如此。
那现在该轮到我表演了。首先给出整个工程结构图如下所示。
POM 文件内容如下所示。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.1</version></parent><groupId>com.lee.javabase</groupId><artifactId>javabase</artifactId><version>1.0-SNAPSHOT</version><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.1.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.16</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies></project>
同样，定义 book 表和 people 表对应的实体类 Book 和 People，如下所示。
@Getter
@Setter
public class Book {@TableField("id")private int id;@TableField("b_name")private String bookName;@TableField("b_price")private float bookPrice;}@Getter
@Setter
public class People {@TableField("id")private int id;@TableField("p_name")private String peopleName;@TableField("p_age")private int peopleAge;}
然后定义定义接口，如下所示。
@Mapper
public interface BookMapper extends BaseMapper<Book> {
}@Mapper
public interface PeopleMapper extends BaseMapper<People> {
}
最后是对应的 Controller 实现， BookController 实现如下。
@Slf4j
@RestController
@RequestMapping("/book")
public class BookController {@Autowiredprivate BookMapper bookMapper;@PostMapping("/add")public ResponseEntity<String> addBook(@RequestBody Book book) {try {bookMapper.insert(book);return new ResponseEntity<>("添加图书成功", HttpStatus.OK);} catch (Exception e) {log.error("添加图书失败", e);return new ResponseEntity<>("添加图书失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/update")public ResponseEntity<String> updateBook(@RequestBody Book book) {try {bookMapper.updateById(book);return new ResponseEntity<>("更新图书成功", HttpStatus.OK);} catch (Exception e) {log.error("更新图书失败", e);return new ResponseEntity<>("更新图书失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/delete")public ResponseEntity<String> deleteBook(@RequestParam("id") int id) {try {bookMapper.deleteById(id);return new ResponseEntity<>("删除图书成功", HttpStatus.OK);} catch (Exception e) {log.error("删除图书失败", e);return new ResponseEntity<>("删除图书失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/list")public ResponseEntity<Book> listBook(@RequestParam("id") int id) {try {Book book = bookMapper.selectById(id);return new ResponseEntity<>(book, HttpStatus.OK);} catch (Exception e) {log.error("查询图书失败", e);return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);}}
}
PeopleController 实现如下所示。
@Slf4j
@RestController
@RequestMapping("/people")
public class PeopleController {@Autowiredprivate PeopleMapper peopleMapper;@PostMapping("/add")public ResponseEntity<String> addPeople(@RequestBody People people) {try {peopleMapper.insert(people);return new ResponseEntity<>("添加人物成功", HttpStatus.OK);} catch (Exception e) {log.error("添加人物失败", e);return new ResponseEntity<>("添加人物失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/update")public ResponseEntity<String> updatePeople(@RequestBody People people) {try {peopleMapper.updateById(people);return new ResponseEntity<>("更新人物成功", HttpStatus.OK);} catch (Exception e) {log.error("更新人物失败", e);return new ResponseEntity<>("更新人物失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/delete")public ResponseEntity<String> deletePeople(@RequestParam("id") int id) {try {peopleMapper.deleteById(id);return new ResponseEntity<>("删除人物成功", HttpStatus.OK);} catch (Exception e) {log.error("删除人物失败", e);return new ResponseEntity<>("删除人物失败", HttpStatus.INTERNAL_SERVER_ERROR);}}@PostMapping("/list")public ResponseEntity<People> listPeople(@RequestParam("id") int id) {try {People people = peopleMapper.selectById(id);return new ResponseEntity<>(people, HttpStatus.OK);} catch (Exception e) {log.error("查询人物失败", e);return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);}}
}
启动应用程序， book 表的 Crud 操作结果如下所示。
prople 表的 Crud 操作结果如下所示。
总结
我宣布，Springboot 就是快速搭建 Crud 工程的神。
其实，在基于 Gin 和 Gorm 搭建 Crud 工程时，云女士还是写得复杂了一点，但是我有幸看过她们云平台的项目的代码，云女士写得也没毛病，虽然是个简化版，但也是严格遵从她们项目的代码结构来实现的。
说回 Springboot，毫无疑问，无论是天然自带 Tomcat 或 Jetty ，还是和三方框架整合的各种 Starter 包，Springboot 都将开箱即用做到了极致，但是转念又一想，其实 Springboot 和 Gin 严格来说做比较没啥意义，就像 Java 和 Go 的比较一样，我觉得也没啥意义，各自的优势区间不一样，并且各自也都在相关的领域叱咤风云。
各位看官，你们觉得呢。