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[Nguyen Minh Hoang]_Create db_to_gorm.go_Week 2 #27

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Create db_to_gorm.go
NemCaBong Jun 5, 2023
f3c68ab
Create redis_gin_go_ex.go
NemCaBong Jun 5, 2023
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214 changes: 214 additions & 0 deletions db_to_gorm.go
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Original file line number Diff line number Diff line change
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package main

import (
"encoding/json"
"fmt"
"log"

"gorm.io/driver/mysql"
"gorm.io/gorm"
)

type Student struct {
// if used gorm.Model
// auto include created_at, deleted_at, id, ...
StudID uint `gorm:"column:stud_id;primaryKey;autoIncrement"`
StudFName string `gorm:"column:stud_fname;type:varchar(50);not null"`
StudLName string `gorm:"column:stud_lname;type:varchar(50);not null"`
StudStreet string `gorm:"column:stud_street;type:varchar(255)"`
StudZip string `gorm:"column:stud_zip;type:varchar(10)"`
StudCity string `gorm:"column:stud_city;type:varchar(50)"`
}
type Professor struct {
profID uint `gorm:"column:prof_id;primaryKey;autoIncrement"`
profLName string `gorm:"column:prof_lname;not null;type:varchar(50)"`
profFName string `gorm:"column:prof_fname;not null;type:varchar(50)`
Classes []Class `gorm:"foreignKey:ProfessorID"`
}
type Room struct {
roomID uint `gorm:"column:room_id;primaryKey;autoIncrement"`
roomLOC string `gorm:"column:room_loc;not null;type:varchar(50)"`
roomCAP string `gorm:"column:room_cap;type:varchar(50)"`
ClassID uint `gorm:"column:class_id"`
Classes []Class `gorm:"foreignKey:RoomID"`
}
type Course struct {
courseID uint `gorm:"column:course_id;primaryKey;autoIncrement"`
courseName string `gorm:"column:course_name;type:varchar(255);not null`
Classes []Class `gorm:"foreignKey:CourseID"`
}
type Class struct {
classID uint `gorm:"column:class_id;primaryKey;autoIncrement"`
className string `gorm:"column:class_name;type:varchar(255);not null`
ProfessorID uint `gorm:"column:prof_id;not null"`
CourseID uint `gorm:"column:course_id;not null"`
RoomID uint `gorm:"column:room_id;not null"`
Enrolls []Enroll `gorm:"foreignKey:ClassID"`
}
type Enroll struct {
StudentID uint `gorm:"column:stud_id;primaryKey"`
ClassID uint `gorm:"column:class_id;primaryKey"`
grade string `gorm:"column:grade;varchar(3);not null"`
}

func (Student) TableName() string {
return "Student"
}
func (Professor) TableName() string {
return "Professor"
}
func (Enroll) TableName() string {
return "Enroll"
}
func (Class) TableName() string {
return "Class"
}
func (Course) TableName() string {
return "Course"
}
func (Room) TableName() string {
return "Room"
}

func main() {
dsn := "root:thobeogalaxy257@tcp(127.0.0.1:3307)/engineerpro?charset=utf8mb4&parseTime=True&loc=Local"
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
if err != nil {
log.Fatal(err)
}
var result1 []map[string]interface{}
var result2 []map[string]interface{}
var result3 []map[string]interface{}
var result4 []map[string]interface{}
var result5 []map[string]interface{}
var result6 []map[string]interface{}
var result7 []map[string]interface{}

// get the student and prof and class they are in
db.Table("Professor").
Select("Student.stud_id, CONCAT(stud_fname, ' ', stud_lname) as stud_fullname, CONCAT(prof_fname, ' ', prof_lname) as prof_fullname, class_name").
Joins("JOIN Class ON Professor.prof_id = Class.prof_id").
Joins("JOIN Enroll On Class.class_id = Enroll.class_id").
Joins("JOIN Student ON Enroll.stud_id = Student.stud_id").
Find(&result1)
jsonData, err := json.MarshalIndent(result1, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 1: ")
fmt.Println(string(jsonData))
// get the distinct class of professor
db.Table("Professor").
Distinct("course_name"). // distinct above select
Select("Professor.prof_id, CONCAT(prof_fname, ' ', prof_lname) as prof_fullname, course_name").
Joins("JOIN Class ON Professor.prof_id = Class.prof_id").
Joins("JOIN Course ON Course.course_id = Class.course_id").
Find(&result2)
jsonData, err = json.MarshalIndent(result2, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 2: ")
fmt.Println(string(jsonData))

// the distinct course that student study
db.Table("Student").
Distinct("course_name"). // distinct above select
Select("Student.stud_id, CONCAT(stud_fname, ' ', stud_lname) as stud_fullname, course_name").
Joins("JOIN Enroll ON Student.stud_id = Enroll.stud_id").
Joins("JOIN Class ON Class.class_id = Enroll.class_id").
Joins("JOIN Course ON Class.course_id = Course.course_id").
Find(&result3)
jsonData, err = json.MarshalIndent(result3, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 3: ")
fmt.Println(string(jsonData))

// make A,B,C,D,E,F as 10,8,6,4,2,0
db.Table("Enroll").
Select(`stud_id,
CASE
WHEN grade = 'A' THEN 10
WHEN grade = 'B' THEN 8
WHEN grade = 'C' THEN 6
WHEN grade = 'D' THEN 4
WHEN grade = 'E' THEN 2
WHEN grade = '7' THEN 0
END AS grade`).
Order("stud_id").
Find(&result4)
jsonData, err = json.MarshalIndent(result4, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 4: ")
fmt.Println(string(jsonData))

// academic ability from AVG(grade)
db.Table("Enroll").
Select(`stud_id,
AVG(CASE
WHEN grade = 'A' THEN 10
WHEN grade = 'B' THEN 8
WHEN grade = 'C' THEN 6
WHEN grade = 'D' THEN 4
WHEN grade = 'E' THEN 2
WHEN grade = '7' THEN 0
END) AS academic_ability`).
Order("stud_id").
Group("stud_id").
Find(&result5)
jsonData, err = json.MarshalIndent(result5, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 5: ")
fmt.Println(string(jsonData))

// điểm trung bình của các class
db.Table("Enroll").
Select(`class_id, class_name,
AVG(CASE
WHEN grade = 'A' THEN 10
WHEN grade = 'B' THEN 8
WHEN grade = 'C' THEN 6
WHEN grade = 'D' THEN 4
WHEN grade = 'E' THEN 2
WHEN grade = '7' THEN 0
END) AS avg_class_grade`).
Joins("JOIN Class ON Class.class_id = Enroll.class_id").
Order("class_id").
Group("class_id").
Find(&result6)
jsonData, err = json.MarshalIndent(result6, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 6: ")
fmt.Println(string(jsonData))

// avg_grade of courses
db.Table("Enroll").
Select(`Course.course_id, course_name,
AVG(CASE
WHEN grade = 'A' THEN 10
WHEN grade = 'B' THEN 8
WHEN grade = 'C' THEN 6
WHEN grade = 'D' THEN 4
WHEN grade = 'E' THEN 2
WHEN grade = '7' THEN 0
END) AS avg_course_grade`).
Joins("JOIN Class ON Class.class_id = Enroll.class_id").
Joins("JOIN Course On Course.course_id = Class.course_id").
Order("Course.course_id").
Group("Course.course_id").
Find(&result7)
jsonData, err = json.MarshalIndent(result7, " ", " ")
if err != nil {
log.Fatal(err)
}
fmt.Println("Query 7: ")
fmt.Println(string(jsonData))
}
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