Question

试图从数据库获取项目，对其进行更新，然后使用GORM将其保存回数据库。但是执行保存后，该过程将挂起。

我还尝试将这些命令包装在事务中，但仍然看到该过程在保存时挂起。

但是我注意到，如果我只是执行“首先”操作来获取项目，然后执行“保存”来保存项目，则该过程将成功完成。

这真的使我感到困惑，因为显然在GORM文档中，更新的示例正是我要在此处实现的。

文档示例

db.First(&user)

user.Name = "jinzhu 2"
user.Age = 100
db.Save(&user)

我的代码

type Item struct {
    PK              int     `json:"-" gorm:"index;primary_key"`
    ID              string  `json:"id" gorm:"index" external_reference_key:"true"`
    MEMO            string  `json:"MEMO"`
}

func main() {

    db, err := gorm.Open("postgres", "host=localHost port=5432 user=postgres password=5206 dbname=item sslmode=disable")
    if err != nil {
        panic(err)
    }
    db.LogMode(true)

    item := Item{}
    db.First(&item) //Gets the item
    item.MEMO = "[hpapaapodfiso]" //Change the field
    db.Save(&item) //Save back to db
    fmt.Printf("%v",item) //never executed, process stops at Save
}

谁能解释给我带来什么改变？是什么导致进程停止/挂起？

非常感谢。

使用postgres日志更新：

2019-06-22 15:39:07 PDT LOG:  database system is ready to accept connections
2019-06-22 15:39:08 PDT LOG:  autovacuum launcher started
2019-06-22 15:40:08 PDT FATAL:  canceling authentication due to timeout
2019-06-22 15:49:23 PDT LOG:  could not receive data from client: No connection could be made because the target machine actively refused it.


2019-06-22 15:53:22 PDT LOG:  could not receive data from client: No connection could be made because the target machine actively refused it.


2019-06-22 15:53:31 PDT LOG:  could not receive data from client: No connection could be made because the target machine actively refused it.


2019-06-22 15:53:46 PDT LOG:  could not receive data from client: No connection could be made because the target machine actively refused it.


2019-06-22 16:05:42 PDT ERROR:  role "username" does not exist
2019-06-22 16:05:42 PDT STATEMENT:  REVOKE CONNECT ON DATABASE triggers FROM PUBLIC, username;

2019-06-22 16:06:14 PDT FATAL:  terminating connection due to administrator command
2019-06-22 16:06:14 PDT FATAL:  terminating connection due to administrator command
2019-06-22 16:06:14 PDT LOG:  could not send data to client: No connection could be made because the target machine actively refused it.


2019-06-22 16:06:14 PDT FATAL:  terminating connection due to administrator command
2019-06-22 16:06:14 PDT LOG:  could not send data to client: No connection could be made because the target machine actively refused it.


2019-06-22 16:06:14 PDT FATAL:  terminating connection due to administrator command
2019-06-22 16:06:14 PDT LOG:  could not send data to client: No connection could be made because the target machine actively refused it.


2019-06-22 16:06:14 PDT LOG:  could not send data to client: No connection could be made because the target machine actively refused it.

为什么执行保存后GORM挂起

0 个答案: