1：参考：https://github.com/jinzhu/gorm

2：数据库脚本（pg）

--create table posts(    id            serial primary key,    content        text,    author        varchar(100),    create_time    timestamptz);create table comments(    id            serial primary key,    content        text,    author        varchar(100),    post_id        int references posts(id),    create_time    timestamptz);

3：posts.go

package postsimport(	"fmt"	"github.com/jinzhu/gorm"	_"github.com/lib/pq"	"time")type Comment struct{	ID			int 			Content		string		`sql:"not null"`	Author		string		`sql:"not null"`	PostId		int 		`sql:"post_id"`	CreateTime	time.Time	`sql:"create_time"`}type Post struct{	ID			int 			Content		string		`sql:"not null"`	Author		string		`sql:"not null"`	CreateTime	time.Time	`sql:"create_time"`	Comments	[]Comment}const(    host = "192.168.72.128"    port = 5432    user = "test"    password = "test"    dbname = "testdb")var Db *gorm.DBfunc init(){	var err error		psqlInfo := fmt.Sprintf("host=%s port=%d user=%s "+		"password=%s dbname=%s sslmode=disable",host, port, user, password, dbname)	Db, err = gorm.Open("postgres", psqlInfo)	if err != nil{		panic(err)	}	Db.AutoMigrate(&Post{}, &Comment{})}func (post *Post) CreatePost() error{	return Db.Create(post).Error}func (comment *Comment) CreateComment(post *Post) error{	return Db.Model(post).Association("Comments").Append(comment).Error}func (post *Post) GetComments() (comments []Comment, err error){	Db.Where("author=$1", "王五").First(post)	err = Db.Model(&post).Related(&comments).Error	return}

　4：main.go

package mainimport(	"fmt"	"time"	"Chapter02/posts")func main(){	post := posts.Post{		Content:"Hello go!",		Author:"王五",		CreateTime:	time.Now(),	}	fmt.Println(post)	err := post.CreatePost()	if err!=nil{		panic(err)	}	fmt.Println(post)	comment := posts.Comment{		Content:"不错哟",		Author:"小二",		CreateTime:	time.Now(),	}	err = comment.CreateComment(&post)	if err != nil{		panic(err)	}	post = posts.Post{}	comments, err := post.GetComments()	if err != nil{		panic(err)	}	for _,p :=  range comments{		fmt.Printf("%s-%s\n", p.Author,p.Content)	}}