执行mongoexport命令的时候 mongoexport --csv -f externalSeqNum,paymentId --host 127.0.0.1:27017 -d liveX -c consume_history -o 0531bill.csv -q '{"consumeStatus":"SUCCESS","externalSeqNum":/^201705/}' 报了异常 is not valid JSON: json: can…

原文:https://blog.csdn.net/Nick_666/article/details/79801914 map记得分配内存 解析出来的int类型会变成float64类型 注意判断不为nil后再转换类型 package main import ( "fmt" "encoding/json" ) func main() { var m map[string]interface{} //声明变量,不分配内存 m = make(map[string]inter…

This sample is for changing from “float64” to “int” for values did unmarshal using map[string]interface{}. When it did unmarshal using map[string]interface{}, a number with “int” was changed to “float64”. And it shows an error as follows. Error : pan…

// *sql.Rows 转换为 []map[string]interface{}类型 func rows2maps(rows *sql.Rows) (res []map[string]interface{}) { defer rows.Close() cols, _ := rows.Columns() cache := make([]interface{}, len(cols)) // 为每一列初始化一个指针 for index, _ := range cache { var a interf…

package main import ( "encoding/json" "fmt" "reflect" ) func demo1() { txt := `{"a":,"b":,"c":[{"name":"","group":""},{"name":"","…

结构体转map[string]interface{}的若干方法 本文介绍了Go语言中将结构体转成map[string]interface{}时你需要了解的"坑",也有你需要知道的若干方法. 我们在Go语言中通常使用结构体来保存我们的数据,例如要存储用户信息,我们可能会定义如下结构体: // UserInfo 用户信息 type UserInfo struct { Name string `json:"name"` Age int `json:"age&qu…

原文:https://www.az1314.cn/art/69 ------------------------------------------ mapA := make([string]interface{})   mapB := make([string]interface{})   mapA["name"] = "小文"    mapA["age"]  = 25   mapB["mapA"] = mapA   for…

package main import ( "encoding/json" "errors" "fmt" "reflect" "strconv" "time" ) type User struct { a string b string } type S struct { User Name string Age int Address string } //结构体转map方法1 fun…

方法compareTo()比较此对象与指定对象的顺序.如果该对象小于.等于或大于指定对象,则分别返回负整数.零或正整数.返回整数,1,-1,0:返回1表示大于,返回-1表示小于,返回0表示相等. 普通的Integer 类型key进行比较: public class java_ListMapSort { public static void main(String[] args) { List<Map<String, Object>> list = new ArrayList<…

Shuffle'm Up Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14471 Accepted: 6633 Description A common pastime for poker players at a poker table is to shuffle stacks of chips. Shuffling chips is performed by starting with two stacks of po…