sql：列索引 0 上的扫描错误，名称" "：不支持扫描，存储驱动程序。值类型 int64 转换为类型 *main。短信？

Question

我现在尝试RESTFUL API，其中column sequenceID不是自动插入，因为故意，当我像countSequenceId：= db.debug（）。（" smsblast2"）。count（＆amp; smsblast1），结果是sql：列索引上的扫描错误0，name'"：notupported扫描，存储驱动程序。

package main
import (
    "encoding/json"
    "fmt"
    "github.com/gorilla/mux"
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mssql"
    "log"
    "net/http"
    "strconv"
    "time"
)
type SMSBlast struct {
    SequenceID   int `gorm:"primary_key";column:"SequenceID"`
    MobilePhone string `gorm:"column:MobilePhone"`
    Output  string  `gorm:"column:Output"`
    WillBeSentDate *time.Time `gorm:"column:WillBeSentDate"`
    SentDate *time.Time `gorm:"column:SentDate"`
    Status *string `gorm:"column:Status"`
    DtmUpd time.Time `gorm:"column:DtmUpd"`
}
func (SMSBlast) TableName() string {
    return "SMSBlast2"
}

func insertSMSBlast(w http.ResponseWriter, r *http.Request){
    fmt.Println("New Insert Created")
    db, err := gorm.Open("mssql", "sqlserver://sa:@localhost:1433?database=CONFINS")
    if err != nil{
        panic("failed to connect database")
    }
    defer db.Close()

    vars := mux.Vars(r)
    mobilephone := vars["mobilephone"]
    output := vars["output"]
    var(
        smsblast1 SMSBlast
    )
    countSequenceId := db.Debug().Raw("SELECT COUNT (*) FROM SMSBlast2").Scan(&smsblast1)
    fmt.Println(countSequenceId)
    msg, err :=  json.Marshal(countSequenceId)
    if err != nil{
        fmt.Println(err.Error())
    }

    sequenceid1,_ := strconv.Atoi(string(msg))
    fmt.Println("SequenceID : " , sequenceid1)
    smsblasts := SMSBlast{SequenceID: sequenceid1,MobilePhone: mobilephone,Output:output, DtmUpd: time.Now()}
    prindata := db.Create(&smsblasts)
    fmt.Println(prindata)
}

func handleRequests(){
    myRouter := mux.NewRouter().StrictSlash(true)
    myRouter.HandleFunc("/smsblaststest",allSMSBlasts).Methods("POST")
    myRouter.HandleFunc("/smsblaststestInsert/{mobilephone}/{output}", insertSMSBlast).Methods("POST")
    log.Fatal(http.ListenAndServe(":8080",myRouter))
}
func main(){
    fmt.Println("SMSBLASTS ORM")
    handleRequests()
}

Answer 1

您似乎假设Gorm方法将为您返回结果。那不是它的工作方式。Gorm返回错误或零零，您将引用转到要存储结果的变量。因此，要在某些内容上使用count（），您会写

之类的东西

var count int
db.Model(&SMSBlast{}).Count(&count)
fmt.Printf("count: %dn", count)

也就是说，如果您只想确保每次都会获得新的序列ID，为什么不使用自动插入？

type SMSBlast struct {
    SequenceID   int `gorm:"primary_key";column:"SequenceID";"AUTO_INCREMENT"`
    ... 
}