go

[]string to jsonb with Gorm and postgres

大兔子大兔子 提交于 2020-11-29 03:12:31
问题 I have a Go struct which contains a slice of strings which I'd like to save as a jsonB object in Postgres with GORM. I've come accross a solution which requires to use the GORM specific type (postgres.Jsonb) which I'd like to avoid. When I try to run the AutoMigrate with a slice in my model, it panics and won't start although when I wrap this slice in a struct (which I'm okay doing) it will run without error but won't create the column in postgres. type User struct { gorm.Model Data []string

卸载RabbitMQ和Erlang

这一生的挚爱 提交于 2020-11-29 00:41:42
如何把RabbitMQ卸载干净 原文转载至:https://blog.csdn.net/w893932747/article/details/81018191 To uninstall RabbitMQ and Erlang from the machine completely, do the following: Open the Windows Control Panel. Double-click Programs and Features. In the list of currently installed programs, right-click RabbitMQ Server, and then click Uninstall. In the list of currently installed programs, right-click Erlang OTP, and then click Uninstall. Open the Windows Task Manager. In the Task Manager, look for the process epmd.exe. If this process is still running, right-click it and then click End Process. Delete all the

Generating random numbers over a range in Go

江枫思渺然 提交于 2020-11-28 03:56:11
问题 All the integer functions in math/rand generate non-negative numbers. rand.Int() int // [0, MaxInt] rand.Int31() int32 // [0, MaxInt32] rand.Int31n(n int32) int32 // [0, n) rand.Int63() int64 // [0, MaxInt64] rand.Int63n(n int64) int64 // [0, n) rand.Intn(n int) int // [0, n) I would like to generate random numbers in the range [-m, n) . In other words, I would like to generate a mix of positive and negative numbers. 回答1: I found this example at Go Cookbook, which is equivalent to rand.Range

Generating random numbers over a range in Go

核能气质少年 提交于 2020-11-28 03:51:12
问题 All the integer functions in math/rand generate non-negative numbers. rand.Int() int // [0, MaxInt] rand.Int31() int32 // [0, MaxInt32] rand.Int31n(n int32) int32 // [0, n) rand.Int63() int64 // [0, MaxInt64] rand.Int63n(n int64) int64 // [0, n) rand.Intn(n int) int // [0, n) I would like to generate random numbers in the range [-m, n) . In other words, I would like to generate a mix of positive and negative numbers. 回答1: I found this example at Go Cookbook, which is equivalent to rand.Range

深度剖析,为何C语言在开发领域的地位如此稳固

心不动则不痛 提交于 2020-11-27 20:52:55
C语言 在这过去的五十年间, 已经 逐渐发展 成为 极其 重要的软件开发语言。这里 简要讲述一下在现在, 它 将 如何与C++、Java、C#、Go、Rust和Python进行竞争 并保持一定优势 。 对于计算机编程语言来说,没有什么技术能 沿 用 半个世纪 年,除非它比其他的都好用。C语言于 上世纪七十年代初 年面世,如今在软件世界仍保持着底层 基础 开发的主流语言的地位。 有时 , 一个技术能被长久的流传使用,是因为人们还没有找到一个更好的替代品。在过去的几十年,涌现了大量的语言—— 甚至出现 专门为了挑战C语言的统治地位而设计 的新语言 。 C真的很难被替代。编程语言调查和软件开发实例都印证了可以用远比 使用 C 语言更好 的方式来做 开发 。但C的地位仍岿然不动, 因为 它的背后是几十年的 积淀和进步 。几乎没有语言可以在性能 、 逻辑、 或者普遍性上打败它。 C vs. C++ 很自然地, 人们会拿 C与C++做对比, 顾名思义 出,C++是从C发展而来的。两者之间的不同就在于易扩展性,或者易用性。 语法和方式上,C++与C语言比较接近,但C++提供了很多原生C没有的有用特性:命名空间、模板、异常、内存管理。项目如果对于性能比较敏感,例如数据库和机器学习,通常使用C++编写 会对提供 系统提高性能 更有帮助 。 除此之外,C++比C更容易扩展。C+

No test coverage when tests are in a different package

怎甘沉沦 提交于 2020-11-27 17:45:40
问题 I have integration tests which are located in a separate directory. Those tests run my http server in the same process via net/http/httptest. My tests run but I get no coverage. Here is a very simplified example not using http for brevity. Directory layout: $GOPATH/src/go-test hello hello.go itest integration_test.go hello.go package hello func Hello() string { return "hello" } integration_test.go package itest import ( "go-test/hello" "testing" ) func TestHello(t *testing.T) { s := hello

No test coverage when tests are in a different package

被刻印的时光 ゝ 提交于 2020-11-27 17:22:17
问题 I have integration tests which are located in a separate directory. Those tests run my http server in the same process via net/http/httptest. My tests run but I get no coverage. Here is a very simplified example not using http for brevity. Directory layout: $GOPATH/src/go-test hello hello.go itest integration_test.go hello.go package hello func Hello() string { return "hello" } integration_test.go package itest import ( "go-test/hello" "testing" ) func TestHello(t *testing.T) { s := hello

No test coverage when tests are in a different package

a 夏天 提交于 2020-11-27 17:21:12
问题 I have integration tests which are located in a separate directory. Those tests run my http server in the same process via net/http/httptest. My tests run but I get no coverage. Here is a very simplified example not using http for brevity. Directory layout: $GOPATH/src/go-test hello hello.go itest integration_test.go hello.go package hello func Hello() string { return "hello" } integration_test.go package itest import ( "go-test/hello" "testing" ) func TestHello(t *testing.T) { s := hello

No test coverage when tests are in a different package

眉间皱痕 提交于 2020-11-27 17:19:37
问题 I have integration tests which are located in a separate directory. Those tests run my http server in the same process via net/http/httptest. My tests run but I get no coverage. Here is a very simplified example not using http for brevity. Directory layout: $GOPATH/src/go-test hello hello.go itest integration_test.go hello.go package hello func Hello() string { return "hello" } integration_test.go package itest import ( "go-test/hello" "testing" ) func TestHello(t *testing.T) { s := hello

No test coverage when tests are in a different package

主宰稳场 提交于 2020-11-27 17:17:13
问题 I have integration tests which are located in a separate directory. Those tests run my http server in the same process via net/http/httptest. My tests run but I get no coverage. Here is a very simplified example not using http for brevity. Directory layout: $GOPATH/src/go-test hello hello.go itest integration_test.go hello.go package hello func Hello() string { return "hello" } integration_test.go package itest import ( "go-test/hello" "testing" ) func TestHello(t *testing.T) { s := hello