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  • djang4o查询某个字段的值

    # -*- coding:utf-8 -*-
    import os,sys
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    sys.path.append(BASE_DIR)
    os.environ['DJANGO_SETTINGS_MODULE'] = 'dbtest.settings'

    import django
    django.setup()


    from db.models import asset,server

    #获取标的某个字段的值
    ret = asset.objects.all() # 不会去连接数据库

    # 当真正用的时候才去连接数据库
    for r in ret:
    print(r.sn)
    # 建立了一个tcp连接,执行的sql语句:
    # SELECT `db_asset`.`id`, `db_asset`.`sn`, `db_asset`.`money`, `db_asset`.`addtime` FROM `db_asset`; args=()


    ret1 = asset.objects.values('sn','money').get(sn='cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3')
    print(ret1)
    # (0.001) SELECT `db_asset`.`sn`, `db_asset`.`money` FROM `db_asset` WHERE `db_asset`.`sn` = 'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3'; args=('cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3',)
    # {'money': 5000.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3'}


    # ret2 = asset.objects.get(sn='cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3').values('sn','money') # 错误
    # print(ret2)

    ret3 = asset.objects.values('sn','money').filter(money=5000)
    print(ret3)
    # (0.001) SELECT `db_asset`.`sn`, `db_asset`.`money` FROM `db_asset` WHERE `db_asset`.`money` = 5000 LIMIT 21; args=(5000.0,)
    # <QuerySet [{'money': 5000.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3'}]>

    ret4 = asset.objects.values('sn','money')
    print(ret4)
    # (0.001) SELECT `db_asset`.`sn`, `db_asset`.`money` FROM `db_asset` LIMIT 21; args=()
    # <QuerySet [{'money': 1000.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c8'}, {'money': 2000.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c1'}, {'money': 1500.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c2'}, {'mo
    # ney': 5000.0, 'sn': u'cb984b6b-0ef9-46ea-b7be-dbe68eb4f2c3'}]>
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  • 原文地址:https://www.cnblogs.com/owasp/p/5981351.html
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