Question

我需要使用Go获得4列。当我在MySQL中运行查询时，我会得到所有4列，但是当我尝试使用Go进行操作时，我只会得到3列。转到代码为：

get() returned more than one Ledger1 -- it returned 2!

当我用Go运行它时，我会看到以下列：id，艺术家和图片。我无法找到song_name列。

当我在MySQL中运行它时，我得到：

{
  "responseId": "a89123c6-42e5-45fa-ab2d-153a9d7e3692",
  "queryResult": {
    "queryText": "I need to make an appointment at 3 PM today.",
    "parameters": {
      "time": "",
      "date": ""
    },
    "allRequiredParamsPresent": true,
    "fulfillmentMessages": [
      {
        "text": {
          "text": [
            ""
          ]
        }
      }
    ],
    "intent": {
      "name": "projects/newagent-b231a/agent/intents/f6477cf2-cd73-4dc3-a8bd-614d45998754",
      "displayName": "Make Appointment"
    },
    "intentDetectionConfidence": 1,
    "diagnosticInfo": {
      "webhook_latency_ms": 142
    },
    "languageCode": "zh-tw"
  },
  "webhookStatus": {
    "code": 13,
    "message": "Webhook call failed. Error: 500 Internal Server Error"
  }
}

Answer 1

我不知道如何以及为什么，但是这段代码有效：

    type song struct {
        Id      int64
        Artist  string
        Name    string
        Picture string
    }

    type data struct {
        Songs []song
    }


    // Open database
    db, err := sql.Open(sqlServer, sqlData)
    checkErr(err)

    rows, err := db.Query("SELECT s.id, s.song_name, a.name, al.picture as artistName FROM music_songs s JOIN music_albums al ON s.album_id = al.id JOIN music_artists a ON a.id = s.artist_id WHERE s.artist_id = ? ORDER BY s.id ASC, al.id ASC", ar)
    checkErr(err)

    var id int64
    var songName string
    var artistName string
    var albumPicture string

    var songs []song
    for rows.Next() {

        err = rows.Scan(&id, &songName, &artistName, &albumPicture)
        songs = append(songs, song{id, songName, artistName, albumPicture})

    }

去和MySQL，不会拉所有列

1 个答案: