better hierarchy and better way to make a CRUD

repository/post/post_mysql.go

@@ -0,0 +1,118 @@
+package post
+
+import (
+	"context"
+	"database/sql"
+
+	models "blog/models"
+	pRepo "blog/repository"
+)
+
+// NewSQLPostRepo ...
+func NewSQLPostRepo(Conn *sql.DB) pRepo.PostRepo {
+	return &mysqlPostRepo{
+		Conn: Conn,
+	}
+}
+
+type mysqlPostRepo struct {
+	Conn *sql.DB
+}
+
+// fetch ...
+func (m *mysqlPostRepo) fetch(ctx context.Context, query string, args ...interface{}) ([]*models.Post, error) {
+	rows, err := m.Conn.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	payload := make([]*models.Post, 0)
+	for rows.Next() {
+		data := new(models.Post)
+		err := rows.Scan(
+			&data.ID,
+			&data.Title,
+			&data.Content,
+		)
+		if err != nil {
+			return nil, err
+		}
+		payload = append(payload, data)
+	}
+	return payload, nil
+}
+
+func (m *mysqlPostRepo) Fetch(ctx context.Context, num int64) ([]*models.Post, error) {
+	query := "Select id, title, content From posts limit ?"
+
+	return m.fetch(ctx, query, num)
+}
+
+func (m *mysqlPostRepo) GetByID(ctx context.Context, id int64) (*models.Post, error) {
+	query := "Select id, title, content From posts where id=?"
+
+	rows, err := m.fetch(ctx, query, id)
+	if err != nil {
+		return nil, err
+	}
+	payload := &models.Post{}
+	if len(rows) > 0 {
+		payload = rows[0]
+	} else {
+		return nil, models.ErrNotFound
+	}
+	return payload, nil
+}
+
+func (m *mysqlPostRepo) Create(ctx context.Context, p *models.Post) (int64, error) {
+	query := "Insert posts SET title=?, content=?"
+
+	stmt, err := m.Conn.PrepareContext(ctx, query)
+	if err != nil {
+		return -1, err
+	}
+
+	res, err := stmt.ExecContext(ctx, p.Title, p.Content)
+	defer stmt.Close()
+
+	if err != nil {
+		return -1, err
+	}
+	return res.LastInsertId()
+}
+
+func (m *mysqlPostRepo) Update(ctx context.Context, p *models.Post) (*models.Post, error) {
+	query := "Update posts set title=?, content=? where id=?"
+
+	stmt, err := m.Conn.PrepareContext(ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	_, err = stmt.ExecContext(
+		ctx,
+		p.Title,
+		p.Content,
+		p.ID,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer stmt.Close()
+	return p, nil
+}
+
+func (m *mysqlPostRepo) Delete(ctx context.Context, id int64) (bool, error) {
+	query := "Delete From posts Where id=?"
+
+	stmt, err := m.Conn.PrepareContext(ctx, query)
+	if err != nil {
+		return false, err
+	}
+	_, err = stmt.ExecContext(ctx, id)
+	if err != nil {
+		return false, err
+	}
+	defer stmt.Close()
+	return true, nil
+}