How do I use ORM features like associations using pgx?

When working with Go and PostgreSQL using the pgx library, you can implement ORM-like features such as associations by manually managing the relationships between your structs. While pgx does not come with built-in ORM features like some other libraries, you can create your own associations through struct embedding and custom queries. Below is an example to illustrate how you can achieve this.

Learn how to implement ORM-like features with pgx in Go, including establishing associations between different models.

Go, pgx, ORM, PostgreSQL, associations, database models


        package main
        
        import (
            "context"
            "github.com/jackc/pgx/v4"
            "log"
            "time"
        )

        type User struct {
            ID   int
            Name string
        }

        type Post struct {
            ID     int
            Title  string
            UserID int
        }

        func main() {
            ctx := context.Background()
            conn, err := pgx.Connect(ctx, "postgres://user:password@localhost:5432/mydb")
            if err != nil {
                log.Fatal(err)
            }
            defer conn.Close(ctx)

            var user User
            var posts []Post
        
            // Fetch user with associated posts
            userID := 1
            err = conn.QueryRow(ctx, "SELECT id, name FROM users WHERE id=$1", userID).Scan(&user.ID, &user.Name)
            if err != nil {
                log.Fatal(err)
            }
        
            rows, err := conn.Query(ctx, "SELECT id, title FROM posts WHERE user_id=$1", userID)
            if err != nil {
                log.Fatal(err)
            }
            defer rows.Close()

            for rows.Next() {
                var post Post
                if err := rows.Scan(&post.ID, &post.Title); err != nil {
                    log.Fatal(err)
                }
                post.UserID = user.ID
                posts = append(posts, post)
            }
        
            // Output the user and their posts
            log.Println(user)
            log.Println(posts)
        }

Go pgx ORM PostgreSQL associations database models

How do I use ORM features like associations using pgx?

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How do I use ORM features like associations using pgx?

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