CSV file operation (go language)

This is a creation in Article, where the information may have evolved or changed.

The go language comes with a csv file reading module, it looks like a good, play today, is also part of the system learning go language ... ^_^

First, write a csv file

Function:

funcnewwriter (w io). Writer) *writer

func (w *writer) Flush ()

Func (w *writer) Write (record []string) (Err OS. Error)

Func (w *writer) Writeall (Records [][]string) (Err OS. Error)

For details, see official website: http://golang.org/pkg/csv/#NewWriter

In fact, write a csv file can not use these functions, directly according to the rules to write to the file, but here are the functions, or write a demo, it is also convenient for me to use later:

Package   main Import ("CSV"        "OS"        "bytes"        "FMT"        ) func Main () { fileName: =  "2.csv"          buf: =  new(bytes. Buffer)         r2: = csv. Newwriter (BUF)            for     0   ;i<  10   ;i++ {     s: =    make     ([]    string    ,  3   )     s[0] =  "User ID"                  s[1] =  "name"                  s[2] =  "Depart"                 R2. Write (s)                R2. Flush ()                }        FMT. Println (BUF)        fout,err: = os. Create (FileName)         defer  fout. Close ()          if  err! =  nil  {         FMT. Println (Filename,err)                return                }    Fout. WriteString (BUF. String ())    }

Second, read the csv file

Function:

Funcnewreader (R io. Reader) *reader

Func (R *reader) Read () (Record []string, Err OS. Error)

Func (R *reader) ReadAll () (Records [][]string, Err OS. Error)

For details, see official website: http://golang.org/pkg/csv/#Reader. Read

1, the first thing to solve is to read all the contents of the file and into a string, here is the ioutil module, the specific code is as follows:

Package   main Import ("Io/ioutil"        "FMT"        ) func Main () { B,err: = Ioutil. ReadFile ("1.csv")          if  err! =  nil  {          Panic(err. String ())                 }        //fmt. Println (b)         FMT. Printf ("%s",string(b))         }

2. Read the contents of the csv file:

Package   main Import ("FMT"        "CSV"        "Strings"        "Io/ioutil"        ) func Main () {//filename: = "1.csv"         FMT. Printf ("Input file name:")          var  fileName  string          FMT. SCANF ("%s", &filename)         Cntb,err: = Ioutil. ReadFile (FileName)         if  err! =  nil  {          Panic(err. String ())                 }         r2: = csv. Newreader (Strings. Newreader (string(CNTB)))         ss,_: = R2. ReadAll ()        //fmt. PRINTLN (ss)         sz: =  len(ss)         For    i:=0; i<sz;i++{         FMT. Println (Ss[i])                }        }

 Well, that's all, I hope it helps.