Grafana 未知列问题

Posted 2023-02-16

【中文标题】Grafana 未知列问题

【英文标题】：Grafana unknown column issue

【发布时间】：2021-11-15 16:42:40

【问题描述】：

我正在使用 grafana 仪表板版本 Grafana v8.1.3 (a61f38238c) 。我正在尝试使用 apanel 保存仪表板。当我尝试保存仪表板时，出现以下错误。

db 查询错误：错误 1054：“字段列表”中的“时间”列未知

  "id": 2,
  "gridPos": 
    "h": 8,
    "w": 12,
    "x": 0,
    "y": 0
  ,
  "type": "gauge",
  "title": "Panel Title",
  "datasource": "mysql-test",
  "pluginVersion": "8.1.3",
  "fieldConfig": 
    "defaults": 
      "thresholds": 
        "mode": "absolute",
        "steps": [
          
            "color": "green",
            "value": null
          ,
          
            "color": "red",
            "value": 80
          
        ]
      ,
      "mappings": [],
      "color": 
        "mode": "thresholds"
      
    ,
    "overrides": []
  ,
  "options": 
    "reduceOptions": 
      "values": false,
      "calcs": [
        "lastNotNull"
      ],
      "fields": ""
    ,
    "showThresholdLabels": false,
    "showThresholdMarkers": true,
    "text": 
  ,
  "targets": [
    
      "format": "time_series",
      "group": [],
      "metricColumn": "none",
      "rawQuery": false,
      "rawSql": "SELECT \r\n NOW() AS \"time\", \r\n name AS metric, \r\n salary as value \r\nFROM demosales \r\nORDER BY empid\r\n",
      "refId": "A",
      "select": [
        [
          
            "params": [
              "empid"
            ],
            "type": "column"
          
        ]
      ],
      "table": "demosales",
      "timeColumn": "time",
      "where": []
    
  ]

是否需要任何特殊的字符串转义？错误是在保存仪表板时。

【参考方案1】：

在 mysql 中Time 是保留字所以尝试更改列名

 "SELECT \r\n NOW() AS \"mytime\", \r\n name AS metric, \r\n salary as value \r\nFROM demosales \r\nORDER BY empid\r\n",