args数量很大时，数据库/ sql无法选择查询 您正在使用哪个版本的Go$ go version go version go1.14 linux/amd64 ？此问题会在最新版本中重现吗？您正在使用什么操作系统和处理器体系结构$ go env GO111MODULE="on" GOARCH="amd64" GOBIN="/home/zabludovsky/go/bin" GOCACHE="/home/zabludovsk

编程问答 2022-08-13

问题描述

您正在使用哪个版本的Go（$ go version go version go1.14 linux/amd64 ）？

go env

此问题会在最新版本中重现吗？

是

您正在使用什么操作系统和处理器体系结构（$ go env GO111MODULE="on" GOARCH="amd64" GOBIN="/home/zabludovsky/go/bin" GOCACHE="/home/zabludovsky/.cache/go-build" GOENV="/home/zabludovsky/.config/go/env" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="linux" GOINSECURE="" GONOPROXY="gl.rosst.ru/backend/*" GONOSUMDB="gl.rosst.ru/backend/*" GOOS="linux" GOPATH="/home/zabludovsky/go" GOPRIVATE="gl.rosst.ru/backend/*" GOPROXY="https://proxy.golang.org,direct" GOROOT="/usr/local/go" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64" GCCGO="gccgo" AR="ar" CC="gcc" CXX="g++" CGO_ENABLED="1" GOMOD="/home/zabludovsky/go/src/awesomeProject1/go.mod" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build174435943=/tmp/go-build -gno-record-gcc-switches" ？

package main

import (
    "database/sql"
    "fmt"
    "strconv"

    _ "github.com/lib/pq"
)

func main()  {
    err := selectFromDb(65536)
    if err != nil{
        panic(err)
    }

    println("where was no errors!")
}

func selectFromDb(argsNumber int) (err error){
    //open connect to postgres database,put your database connection string below,instead of second argument
    db,err := sql.Open("postgres","postgres://mayber:password@localhost:5432/test?sslmode=disable")
    if err != nil {
        return
    }

    //preparing query,you can call this func with argsNumber = 10(or some not huge number)
    //to check that it is working correct
    var args []interface{}
    query := "SELECT id FROM test_tbl WHERE id IN ("
    for i := 0; i < argsNumber; i++ {
        args = append(args,strconv.Itoa(i))
        query = fmt.Sprintf("%s $%d,",query,i+1)
        fmt.Printf("preparing query,%d/%d \n",i,argsNumber)
    }
    query = fmt.Sprintf("%s);",query[:len(query)-2])
    fmt.Println("preparing finished:")

    //uncomment string bellow to see result query and check it
    //fmt.Println(query)


    //preparing query
    stmt,err := db.Prepare(query)
    if err != nil {
        return
    }

    //selecting
    rows,err := stmt.Query(args...)
    if err != nil{
        return
    }

    //closing db connection
    err = rows.Close()
    if err != nil{
        return
    }

    return
}

您做了什么？

preparing query,0/65536
preparing query,1/65536
...
preparing query,60535/65536
preparing finished:
where was no errors!

您期望看到什么？

preparing finished:
panic: sql: expected 0 arguments,got 65536

相反，您看到了什么？

    [HttpGet]
    [JWTAuthenticate]
    [CustomAttribute]
    [LogInfo]
    [LogException]
    [Route("Overview")]
    public string GetAccount()
    {
        return "Hello this is a sample api";
    }

    [HttpGet]
    [JWTAuthenticate]
    [CustomAttribute]
    [LogInfo]
    [LogException]
    [Route("GetMenu")]
    public ResponseStatus GetMainMenuSubmenu()
    {
        ResponseStatus objResponseStatus = new ResponseStatus();
        JObject obj = new JObject();
        MenuResponseModel objMMSMModel = new MenuResponseModel();
        string allowedMenus = "";
        try
        {
            allowedMenus = CommonUtility.GetConfigValue("AllowedMenuIDs");
            MainMenuViewModel objMainMenuViewModel = LoginBizModel.GetMainMenuSubmenu(Convert.ToString(System.Web.HttpContext.Current.Items["emailID"]));
            if (objMainMenuViewModel != null && objMainMenuViewModel.MainMenuDetails != null && objMainMenuViewModel.MainMenuDetails.Count > 0)
            {
                objMMSMModel.CustomerName = Convert.ToString(System.Web.HttpContext.Current.Items["CustomerName"]);
                objMMSMModel.UserName = Convert.ToString(System.Web.HttpContext.Current.Items["userName"]);
                objMMSMModel.emailID = Convert.ToString(System.Web.HttpContext.Current.Items["emailID"]);
                objMMSMModel.roleName = Convert.ToString(System.Web.HttpContext.Current.Items["RoleName"]);

                objMMSMModel.MenuDetails = new List<MenuSubMenuModel>();

                //Expose menu(s) only that are given in webconfig
                objMainMenuViewModel.MainMenuDetails = objMainMenuViewModel.MainMenuDetails.Where(x => allowedMenus.Contains(x.MainMenuName)).ToList();
                foreach (MenuModel mm in objMainMenuViewModel.MainMenuDetails)
                {
                    MenuSubMenuModel menu = new MenuSubMenuModel();
                    menu.MainMenuName = mm.MainMenuName;
                    menu.SubMenuName = mm.SubMenuName;
                    menu.SubMenuId = mm.SubMenuId;
                    objMMSMModel.MenuDetails.Add(menu);
                }
            }

            objResponseStatus = ResponseStatus.SetResponseStatus(objResponseStatus,1000,Constants.Success,objMMSMModel);
        }
        catch (Exception ex)
        {
            Common.LogError(System.Reflection.MethodBase.GetCurrentMethod().Name,ex,new System.Diagnostics.StackTrace(ex,true).GetFrame(0).GetFileLineNumber());
            ResponseStatus.SetExceptionResponseStatus(objResponseStatus,ex);
        }
        return objResponseStatus;
    }

了解更多详情，https://github.com/GlebZabl/golang_postgres_bug

解决方法

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