如何从SQL select的query_results中提取ansible中的值？

Question

这真的让我抓狂：我创建了一个简单的选择来测试 ansible playbook 中 MySQL 安装的结果：

 - name: Simple select query to db playground
   community.mysql.mysql_query:
     login_db: {{ database name }}
     login_user: {{ login_user }}
     login_password: {{ login_password }}
     query: SELECT * FROM equipment;
   register: r_query

我将该任务的结果注册到变量中

r_query

。

当我调试此变量的 query_result 时，我得到以下信息：

ok: [db01] => {
    "msg": [
        [
            {
                "color": "white",
                "id": 2,
                "quant": 1,
                "type": "shark"
            },
            {
                "color": "grey",
                "id": 4,
                "quant": 2,
                "type": "whale"
            }
        ]
    ]
}
ok: [db02] => {
    "msg": [
        [
            {
                "color": "white",
                "id": 2,
                "quant": 1,
                "type": "shark"
            },
            {
                "color": "grey",
                "id": 4,
                "quant": 2,
                "type": "whale"
            }
        ]
    ]
}
ok: [db03] => {
    "msg": [
        [
            {
                "color": "white",
                "id": 2,
                "quant": 1,
                "type": "shark"
            },
            {
                "color": "grey",
                "id": 4,
                "quant": 2,
                "type": "whale"
            }
        ]
    ]
}

我已经检查了一些如何提取单个值的解释，但还没有任何效果。

如何获取第一台机器结果的第二个颜色值

db01

？

提前非常感谢
托马斯

Answer 1

让我们创建下面的库存，并将第二种颜色更改为red、green和blue进行测试

shell> cat hosts
all:
  hosts:
    db01:
      r_query:
        - - {color: white, id: 2, quant: 1, type: shark}
          - {color: red, id: 4, quant: 2, type: whale}
    db02:
      r_query:
        - - {color: white, id: 2, quant: 1, type: shark}
          - {color: green, id: 4, quant: 2, type: whale}
    db03:
      r_query:
        - - {color: white, id: 2, quant: 1, type: shark}
          - {color: blue, id: 4, quant: 2, type: whale}

请参阅主机变量。该字典保留所有主机的所有变量。例如，

    - debug:
        var: hostvars[inventory_hostname].r_query.0.1.color

给予

ok: [db01] => 
  hostvars[inventory_hostname].r_query.0.1.color: red
ok: [db02] => 
  hostvars[inventory_hostname].r_query.0.1.color: green
ok: [db03] => 
  hostvars[inventory_hostname].r_query.0.1.color: blue

到“访问第一台机器db01的结果的第二个颜色值”

    - debug:
        var: hostvars.db01.r_query.0.1.color

给予

ok: [db01] => 
  hostvars.db01.r_query.0.1.color: red
ok: [db02] => 
  hostvars.db01.r_query.0.1.color: red
ok: [db03] => 
  hostvars.db01.r_query.0.1.color: red

当然，主机不需要 hostvars 来访问其变量

    - debug:
        var: r_query.0.1.color

给予

ok: [db01] => 
  r_query.0.1.color: red
ok: [db02] => 
  r_query.0.1.color: green
ok: [db03] => 
  r_query.0.1.color: blue

---

用于测试的完整剧本示例

- hosts: all

  tasks:

    - debug:
        var: hostvars[inventory_hostname].r_query.0.1.color

    - debug:
        var: hostvars.db01.r_query.0.1.color

    - debug:
        var: r_query.0.1.color