Django制作查询原始SQL

Question

model

class Member(models.Model):
   id_unit = models.ForeignKey(Unit)
   id_fleet = models.ForeignKey(Fleet)

   def __str__(self):
       return str(self.id_fleet)

views.py

    def fleet_member_view(request):
        cursor = connection.cursor()
        cursor.execute("select fleet_member.id_fleet_id, array_to_string(array_agg(fleet_member.id_unit_id),',') as id_unit 
            from fleet_member, setup_unit 
            where fleet_member.id_unit_id = setup_unit.id group by fleet_member.id_fleet_id")
        row = cursor.fetchone()
        return render(request,'fleet_member_view.html',{'row': row}, context_instance= RequestContext(request))

i want to show data in my template

{% for post in row %}
    <tr class="odd gradeX">
       <td>{{ post.id_fleet }}</td>
       <td>{{ post.id_unit }}</td>
    </tr>
{% endfor %}

but data cannot show anything, i try query SQL in command line data show well. why data cannot show in template?

Answer 1

cursor.fetchone() retrieves the next row of a query result set and returns a single sequence, or None .

{% ifnotequal row None %}
    <tr class="odd gradeX">
       <td>{{ row.0 }}</td>
       <td>{{ row.1 }}</td>
    </tr>
{% endifnotequal %}

You want to list all results, you should use cursor.fetchall()

View

def fleet_member_view(request):
    cursor = connection.cursor()
    cursor.execute("select fleet_member.id_fleet_id, array_to_string(array_agg(fleet_member.id_unit_id),',') as id_unit 
        from fleet_member, setup_unit 
        where fleet_member.id_unit_id = setup_unit.id group by fleet_member.id_fleet_id")
    row = cursor.fetchall()
    return render(request,'fleet_member_view.html',{'row': row}, context_instance= RequestContext(request))

Template

{% for post in row %}
    <tr class="odd gradeX">
       <td>{{ post.0 }}</td>
       <td>{{ post.1 }}</td>
    </tr>
{% endfor %}