Django中如何直接执行SQL语句

    try:
        connection = MySQLdb.connect(host=SQL_IP,
                                     user=SQL_USER,
                                     passwd=SQL_PASSWD,
                                     db=SQL_DB, charset='utf8')
        cursor = connection.cursor()
        cmd_query = query_data(request)
        data_sort = sort_data(request)
        cmd = "set session group_concat_max_len = 8000;"
        cursor.execute(cmd)
        ......

connection.cursor()
cursor.execute(sql, [params])
cursor.fetchone() or cursor.fetchall()

from django.db import connection
def my_custom_sql(self):
    with connection.cursor() as cursor:
        cursor.execute("UPDATE bar SET foo = 1 WHERE baz = %s", [self.baz])
        cursor.execute("SELECT foo FROM bar WHERE baz = %s", [self.baz])
        row = cursor.fetchone()
    return row

from django.db import connections
with connections['my_db_alias'].cursor() as cursor:
    # Your code here...

with connection.cursor() as c:
    c.execute(...)

c = connection.cursor()
try:
    c.execute(...)
finally:
    c.close()

from django.db.transaction import commit_on_success
@commit_on_success
def my_custom_sql_view(request, value):
    from django.db import connection, transaction
    cursor = connection.cursor()
    # Data modifying operation
    cursor.execute("UPDATE bar SET foo = 1 WHERE baz = %s", [value])
    # Since we modified data, mark the transaction as dirty
    transaction.set_dirty()
    # Data retrieval operation. This doesn't dirty the transaction,
    # so no call to set_dirty() is required.
    cursor.execute("SELECT foo FROM bar WHERE baz = %s", [value])
    row = cursor.fetchone()
    #transaction.commit_unless_managed()
    return render_to_response('template.html', {'row': row})

#导入原生sql模块
from django.db import connection
# 获取当前用户关注课程列表
def get_myflow(request):
    # 获取用户id
    uid = request.GET.get('id')
    # 建立游标对象
    cursor = connection.cursor()
    # 链表查询
    cursor.execute('select a.username,c.title from user a left join flows b on a.id=b.uid left join course c on b.cid=c.id where a.id = %s'% uid)
    # 获取结果集
    result = dictfetchall(cursor)
    print(result)
    # 返回结果
    return HttpResponse(json.dumps(result),content_type='application/json')