[轉]區塊鍊 blockshain bitcoin ethereum

非常好的說明 Block
https://www.youtube.com/watch?v=_160oMzblY8
https://anders.com/blockchain/


https://www.inside.com.tw/2018/05/16/monero-hard-fork-success

[轉]Golang 交叉编译跨平台的可执行程序 (Mac、Linux、Windows )

https://www.jisec.com/application-development/753.html

OS ARCH OS version
linux 386 / amd64 / arm >= Linux 2.6
darwin 386 / amd64 OS X (Snow Leopard + Lion)
freebsd 386 / amd64 >= FreeBSD 7
windows 386 / amd64 >= Windows 2000

 go env


Mac 下编译 Linux 和 Windows 64位可执行程序

CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build main.go
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build main.go



Linux 下编译 Mac 和 Windows 64位可执行程序

CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build main.go
CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build main.go

Windows 下编译 Mac 和 Linux 64位可执行程序

SET CGO_ENABLED=0
SET GOOS=darwin
SET GOARCH=amd64
go build main.go

SET CGO_ENABLED=0
SET GOOS=linux
SET GOARCH=amd64
go build main.go

golang []map[string]interface{} sqlx BUT

Golang often us []interface{} or map[string]interface{}

sqlx.Queryx Alternate Scan Types



rows, err := db.Queryx("SELECT * FROM place")
for rows.Next() {
  // cols is an []interface{} of all of the column results
  cols, err := rows.SliceScan()
}

rows, err := db.Queryx("SELECT * FROM place")
for rows.Next() {
  results := make(map[string]interface{})
  err = rows.MapScan(results)
}

So
func Sqlselectall(db1 *sqlx.DB, table string) []map[string]interface{} {

  rows, err := db1.Queryx("SELECT * FROM  " + table)
  if err != nil { }

  results := []map[string]interface{}{}
  for rows.Next() {
    result := make(map[string]interface{})
    err = rows.MapScan(result)
    results = append(results, result)
  }

  return results
}


BUT  results to json use c.JSON(http.StatusOK, results) get warning value


https://stackoverflow.com/questions/39391437/merge-two-or-more-mapstringinterface-types-into-one-in-golang