我正在尝试使用反射来设置指针。elasticbeanstalk.CreateEnvironmentInput有一个SolutionStackName类型为 的字段*string。当我尝试设置任何值时出现以下错误：
panic: reflect: call of reflect.Value.SetPointer on ptr Value
这是我的代码：
...
newEnvCnf := new(elasticbeanstalk.CreateEnvironmentInput)
checkConfig2(newEnvCnf, "SolutionStackName", "teststring")
...
func checkConfig2(cnf interface{}, key string, value string) bool {
log.Infof("key %v, value %s", key, value)
v := reflect.ValueOf(cnf).Elem()
fld := v.FieldByName(key)
if fld.IsValid() {
if fld.IsNil() && fld.CanSet() {
fld.SetPointer(unsafe.Pointer(aws.String(value)))
//aws.String returns a pointer
...
这是日志输出
time="2016-02-20T23:54:52-08:00" level=info msg="key [SolutionStackName], value teststring"
panic: reflect: call of reflect.Value.SetPointer on ptr Value [recovered]
panic: reflect: call of …我正在尝试读取 Spring Boot 控制台应用程序的资源文件夹中的文件，但出现文件未找到异常。
这是我的 pom
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.*</include>
</includes>
</resource>
这是例外：
java.io.FileNotFoundException: class path resource [9.txt] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/Users/abc/Documents/workspace-sts-3.8.4.RELEASE/xyz/target/xyz-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/9.txt
我打开了 xyz-0.0.1-SNAPSHOT.jar 文件，9.txt 位于 BOOT-INF/classes 文件夹中。
谢谢，-dj
我是Go的新手,想知道为什么Go认为我没有使用vpcGrp？你会怎么编码？
这是我的代码:
var vpcGrp *ec2.SecurityGroup
grpExists := false
resp, err := svc.DescribeSecurityGroups(params)
if err != nil {
log.Error(err)
} else {
for _, v := range resp.SecurityGroups {
if *v.GroupName == grpName {
log.Debug("VPC Security Group Found [", grpName, "]")
vpcGrp = v
grpExists = true
}
}
}
if !grpExists {
vpcGrp, err := createDbSecurityGrp(grpName, vpcId, region)
if err != nil {
log.Error(err)
return nil, err
}
}
return vpcGrp, nil
我正在尝试编写一个Go程序来遍历目录并找到某个文件并将该信息存储在Map中.这是我到目前为止所拥有的.我不知道如何将Map传递给访问函数,因为它是一个回调函数.
..
type MyFile struct {
Name string
FilePath string
FileMD5Hash [16]byte
}
func visit(path string, f os.FileInfo, err error) error {
fileName := f.Name()
if !f.IsDir() && strings.Contains(strings.ToLower(fileName), "myfile") {
df := parseFile(path)
fmt.Printf("Visited: %s [%x], %s, %s\n", df.FilePath)
}
return nil
}
func parseFile(path string)...
func check(e error) ...
func WalkDir(path string) {
err := filepath.Walk(path, visit)
fmt.Printf("filepath.Walk() returned %v\n", err)
}
我正在尝试运行条件插入语句，但遇到问题。声明如下：
insert into category_content (category_id, content_id, content_type_id, priority) (select 29, id, 1, 1 from article where blog_id = 80)
where not exists(
select * from category_content where category_id = 29 and firstname in (select id from article where blog_id = 80)
);
这是我得到的错误：
insert into category_content (category_id, content_id, content_type_id, priority) (select 29, id, 1, 1 from article where blog_id = 80)
where not exists(
select * from category_content where category_id = 29 and firstname in (select id from article where …