sprechstunden-go/repositories/course.go

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package repositories
import (
"database/sql"
"errors"
"fmt"
"log"
"officeHours/models"
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)
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// A struct to hold the db connection
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type CourseRepo struct {
db *sql.DB
}
func NewCourseRepo(db *sql.DB) *CourseRepo {
return &CourseRepo{
db: db,
}
}
func (r *CourseRepo) FindByName(name string) (models.Course, error) {
return r.getFromRow(r.db.QueryRow("SELECT * FROM course WHERE name=?", name))
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}
func (r *CourseRepo) FindById(id int) (models.Course, error) {
return r.getFromRow(r.db.QueryRow("SELECT * FROM course WHERE id=?", id))
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}
func (r *CourseRepo) GetAll() ([]models.Course, error) {
rows, err := r.db.Query("SELECT * FROM course ORDER BY name ASC")
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if err != nil {
log.Printf("Error getting all courses: %s", err.Error())
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return nil, err
}
defer rows.Close()
return r.getFromRows(rows)
}
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// Helper function to get a course from multiple SQL result rows
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func (r *CourseRepo) getFromRows(rows *sql.Rows) ([]models.Course, error) {
var courses []models.Course
for rows.Next() {
var course models.Course
if err := rows.Scan(&course.Id, &course.Name); err != nil {
log.Printf("Error scanning course row: %s", err.Error())
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return courses, err
}
courses = append(courses, course)
}
return courses, nil
}
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// Helper function to get a course from an SQL result row
func (r *CourseRepo) getFromRow(row *sql.Row) (models.Course, error) {
var course models.Course
if err := row.Scan(&course.Id, &course.Name); err != nil {
err = fmt.Errorf("Error getting course row: %w", err)
if !errors.Is(err, sql.ErrNoRows) {
log.Printf(err.Error())
}
return models.Course{}, err
}
return course, nil
}