Go：使用 tx.MustExec 创建新记录后出现恐慌错误

Question

当我使用 db.Exec 时，它工作正常并且也在创建记录，但它会引起恐慌。我不知道为什么。我是 golang 的初学者，所以我不确定这个错误是什么意思以及如何解决。如果我注释掉 panic 部分，我的整个应用程序都可以正常工作。

tx := db.MustBegin()
// _,err := db.Exec(queries.QueryInsertUserData, user.ID, user.Username, user.FirstName, user.LastName, user.Phone)
err := tx.MustExec("INSERT INTO users (id, created_at, updated_at, deleted_at, username, password, first_name, last_name, phone, status) VALUES(, now(), now(), NULL, , NULL, , , , true)", user.ID, user.Username, user.FirstName, user.LastName, user.Phone)
tx.Commit()

if err != nil {
  panic(err) // Giving error
}

错误：

2022/05/28 09:57:17 http: panic serving [::1]:53468: {0xc0001b6000 1}
goroutine 35 [running]:
net/http.(*conn).serve.func1(0xc0001b2280)
        /usr/local/go/src/net/http/server.go:1772 +0x139
panic(0x13538e0, 0xc0000a8780)
        /usr/local/go/src/runtime/panic.go:975 +0x3e3
GO_APP/app/handler.CreateUser(0xc00009aea0, 0x13ff7c0, 0xc00018e1c0, 0xc0001d0000)
        /Users/kritisahu/Desktop/go_app/app/handler/users.go:61 +0x7ec
GO_APP/app.(*App).CreateUser(...)
        /Users/kritisahu/Desktop/go_app/app/app.go:47
github.com/julienschmidt/httprouter.(*Router).ServeHTTP(0xc000182420, 0x13ff7c0, 0xc00018e1c0, 0xc0001d0000)
        /Users/kritisahu/go/pkg/mod/github.com/julienschmidt/httprouter@v1.3.0/router.go:387 +0xc37
net/http.serverHandler.ServeHTTP(0xc00018e0e0, 0x13ff7c0, 0xc00018e1c0, 0xc0001d0000)
        /usr/local/go/src/net/http/server.go:2807 +0xa3
net/http.(*conn).serve(0xc0001b2280, 0x14000c0, 0xc0001ba040)
        /usr/local/go/src/net/http/server.go:1895 +0x86c
created by net/http.(*Server).Serve
        /usr/local/go/src/net/http/server.go:2933 +0x35c

Answer 1

你得到一个错误，因为 Tx.MustExec 不是 return 一个错误，而是 return 一个接口

type Result interface {
    // LastInsertId returns the integer generated by the database
    // in response to a command. Typically this will be from an
    // "auto increment" column when inserting a new row. Not all
    // databases support this feature, and the syntax of such
    // statements varies.
    LastInsertId() (int64, error)

    // RowsAffected returns the number of rows affected by an
    // update, insert, or delete. Not every database or database
    // driver may support this.
    RowsAffected() (int64, error)
}

所以在你的代码中 err 存储结果接口值。而不是这样写

result := tx.MustExec("INSERT INTO users (id, created_at, updated_at, deleted_at, username, password, first_name, last_name, phone, status) VALUES(, now(), now(), NULL, , NULL, , , , true)", user.ID, user.Username, user.FirstName, user.LastName, user.Phone)

fmt.Println(result.RowsAffected())

Go：使用 tx.MustExec 创建新记录后出现恐慌错误

Go: panic error after creating a new record with tx.MustExec

transactions

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sqlx