let record = DB.create("todo").await?; Ok(record) } 型这是一个新的错误: Err(Api(FromValue { value: Array(Array([Object(Object({"id": Thing(Thing { tb: "todo", id: String("08kipc79181usjbuxlnu") })}))])), error: "invalid type: map, expected a string" })) ...
ErrorKind::NotFound => File::create("hello.tx").unwrap_or_else(|error| {panic!("Problem creating the file: {:?}", error); }),// 匹配错误原因, 对于文件不存在的错误处理为创建文件other_error_kind =>panic!("Problem opening the file: {:?}", other_error_kind) } });println!("{:...
use std::fs::File; use std::io::ErrorKind; fn main() { let greeting_file = File::open("hello.txt").unwrap_or_else(|error| { if error.kind() == ErrorKind::NotFound { File::create("hello.txt").unwrap_or_else(|error| { panic!("Problem creating the file: {:?}", error);...
fndangle()->&String{// error[E0106]: missing lifetime specifierlets=String::from("hello");&s...
Err(error) =>matcherror.kind() {// 如果打开失败则创建文件 ErrorKind::NotFound =>matchFile::create("test.txt") {// 创建也可能失败,所以需要继续match Ok(fc) => fc, Err(e) =>panic!("Err creat file: {:?}", e), }, other_err =>panic!("Err open file: {:?}", other_err), ...
usestd::fs;usestd::io::ErrorKind;fnread_a_file()->Result<usize,std::io::Error>{letcontent=fs::read_to_string("./input.txt")?;returnOk(content.len());}fnmain(){letsize=matchread_a_file(){Ok(val)=>val,Err(err)=>{matcherr.kind(){ErrorKind::NotFound=>{fs::File::create("...
当被调用函数体中出现错误时,与其在该函数中处理错误,更常见的方式是把把错误返回给调用函数以更好控制代码的流程,这被称为传播错误(propagating error)。 usestd::fs::File;usestd::io::{self, Read};fnread_username_from_file()->Result<String, io::Error> {letusername_file_result= File::open("hel...
当被调用函数体中出现错误时,与其在该函数中处理错误,更常见的方式是把把错误返回给调用函数以更好控制代码的流程,这被称为传播错误(propagating error)。 use std::fs::File; use std::io::{self, Read}; fn read_username_from_file() -> Result<String, io::Error> { ...
1usestd::fs::File;2usestd::io::ErrorKind;34fnmain() {5letf=File::open("hello.txt").unwrap_or_else(|err|{6matcherr.kind() {7ErrorKind::NotFound=>File::create("hello.tx").unwrap_or_else(|error|{8panic!("Problem creating the file:{:?}", error);9}),// 匹配错误原因, 对于...
我们希望在内层match中检查的条件是error.kind()的返回值是否为ErrorKind的NotFound成员。如果是,则尝试通过File::create创建文件。然而因为File::create也可能会失败,还需要增加一个内层match语句。当文件不能被打开,会打印出一个不同的错误信息。外层match的最后一个分支保持不变,这样对任何除了文件不存在的错误会使...