go

问题 I'm having trouble figuring out the correct way to use interfaces in Go. My function needs to take a map of items that implement a certain method. It looks like this: type foo interface { bar() string } func doSomething(items map[string]foo) { } I'm trying to call this function with a type that implements the foo interface. type baz struct { } func (b baz) bar() string { return "hello" } items := map[string]baz{"a": baz{}} doSomething(items) But I get the following error: cannot use items

问题 I'm having trouble figuring out the correct way to use interfaces in Go. My function needs to take a map of items that implement a certain method. It looks like this: type foo interface { bar() string } func doSomething(items map[string]foo) { } I'm trying to call this function with a type that implements the foo interface. type baz struct { } func (b baz) bar() string { return "hello" } items := map[string]baz{"a": baz{}} doSomething(items) But I get the following error: cannot use items

问题 My input JSON, has a list of different elements. I have problems with the number of the first element of response. Simplified example: package main import ( "fmt" "log" "encoding/json" ) var j = ` { "response": [ 777, // problem here !!! { "id": 888, "from_id": 999, "to_id": 888, "text": "hello..." }, { "id": 999, "from_id": 888, "to_id": 999, "text": "goodbye..." } ] }` type D struct { Id int `json:"id"` FromId int `json:"from_id"` ToId int `json:"to_id"` Text string `json:"text"` } type R

问题 I have the following xml "file": <pinnacle_line_feed> <PinnacleFeedTime>1439954818555</PinnacleFeedTime> <lastContest>34317132</lastContest> <lastGame>218491030</lastGame> <events> <event> <event_datetimeGMT>2015-08-21 09:50</event_datetimeGMT> <gamenumber>483406220</gamenumber> <sporttype>Aussie Rules</sporttype> <league>AFL</league> <IsLive>No</IsLive> <participants> <participant> <participant_name>Hawthorn Hawks</participant_name> <contestantnum>1251</contestantnum> <rotnum>1251</rotnum>

问题 I have the following xml "file": <pinnacle_line_feed> <PinnacleFeedTime>1439954818555</PinnacleFeedTime> <lastContest>34317132</lastContest> <lastGame>218491030</lastGame> <events> <event> <event_datetimeGMT>2015-08-21 09:50</event_datetimeGMT> <gamenumber>483406220</gamenumber> <sporttype>Aussie Rules</sporttype> <league>AFL</league> <IsLive>No</IsLive> <participants> <participant> <participant_name>Hawthorn Hawks</participant_name> <contestantnum>1251</contestantnum> <rotnum>1251</rotnum>

问题 How can I prevent SQL injection attacks in Go while using "database/sql"? This solves the single value field problem because you can remove the quotes, but I can't do that filtering a JSON/JSONB field, like in the following because the $1 is considered a string: `SELECT * FROM foo WHERE bar @> '{"baz": "$1"}'` The following works but it's prone to SQL Injection: `SELECT * FROM foo WHERE bar @> '{"baz": "` + "qux" + `"}'` How do I solve this? EDITED after @mkopriva's comment: How would I build

问题 I'm using go's exec Run command to get command output, which works great when the command 'Stdout' field is set to os.Stdout , and the error is sent to os.Stderr . I want to display the output and the error output to the console, but I also want my program to see what the output was. I then made my own Writer type that did just that, wrote both to a buffer and printed to the terminal. Here's the problem—some applications change their output to something much less readable by humans when it

问题 I'm using go's exec Run command to get command output, which works great when the command 'Stdout' field is set to os.Stdout , and the error is sent to os.Stderr . I want to display the output and the error output to the console, but I also want my program to see what the output was. I then made my own Writer type that did just that, wrote both to a buffer and printed to the terminal. Here's the problem—some applications change their output to something much less readable by humans when it

问题 In my Cassandra config I have enabled user authentication and connect with cqlsh over ssl. I'm having trouble implementing the same with gocql, following is my code: cluster := gocql.NewCluster("127.0.0.1") cluster.Authenticator = gocql.PasswordAuthenticator{ Username: "myuser", Password: "mypassword", } cluster.SslOpts = &gocql.SslOptions { CertPath: "/path/to/cert.pem", } When I try to connect I get following error: gocql: unable to create session: connectionpool: unable to load X509 key

问题 I'm writing a library to deal with a binary format. I have a struct with array vars, that I would like to keep for documentation purposes. I need also to seek and tell from the input slice of bytes. Some pseudocode: type foo struct { boo [5]byte coo [3]byte } func main() { // input is a []byte full of datas, read from a file var bar foo // Here i need something that writes 5 bytes to bar.foo from input bar.foo = somefunc(input, numberOfFoo) // ??? // I need also tell() and seek() input.seek(n