How to Implement Multi-Tenancy in Go Database Layer

Web Database
2026-04-17T12:05:42+00:00
Implement multi-tenancy in Go by adding a tenant_id column to your database and filtering all queries using a context value to ensure data isolation.

Implement multi-tenancy by adding a tenant_id column to your tables and filtering all queries with WHERE tenant_id = ? using a context value.

func GetUsers(ctx context.Context, db *sql.DB) ([]User, error) {
    tenantID := ctx.Value("tenant_id").(string)
    rows, err := db.QueryContext(ctx, "SELECT * FROM users WHERE tenant_id = ?", tenantID)
    if err != nil { return nil, err }
    defer rows.Close()
    var users []User
    for rows.Next() {
        var u User
        if err := rows.Scan(&u.ID, &u.Name, &u.TenantID); err != nil { return nil, err }
        users = append(users, u)
    }
    return users, nil
}
  1. Add a tenant_id column to your database schema for every table that holds tenant data.
  2. Store the tenant identifier in the request context at the entry point of your application.
  3. Pass the context to your database queries and enforce the tenant_id filter in every SQL statement.
  4. Use a middleware or wrapper function to automatically inject the tenant ID into the context for every incoming request.