mysql數據導出golang實現

正文

mysql數據導出爲excel文件，golang實現：

首先下載依賴到的三方庫：

Simple install the package to your $GOPATH with the go tool from shell:

$ go get -u github.com/go-sql-driver/mysql複製代碼

具體說明請看：庫地址wiki說明

代碼示例以下，用到了go的flag包的能力，傳入命令行參數。具體看helpInfo：

Usage of mysqldataexport:
  -port int
         the port for mysql,default:32085
  -addr string
        the address for mysql,default:10.146.145.67
  -user string
        the username for login mysql,default:dbuser

  -pwd     string
        the password for login mysql by the username,default:Admin@123
  -db     string
        the port for me to listen on,default:auditlogdb
  -tables string
        the tables will export data, multi tables separator by comma, default:op_log,sc_log,sys_log複製代碼

代碼：

package main

// 從Mysql中導出數據到CSV文件。

import (
    "database/sql"
    "encoding/csv"
    "fmt"
    "os"
    _ "github.com/go-sql-driver/mysql"
    "flag"
    "strings"
)

var (
    tables         = make([]string, 0)
    dataSourceName = ""
)

const (
    driverNameMysql = "mysql"

    helpInfo = `Usage of mysqldataexport:
  -port int
         the port for mysql,default:32085
  -addr string
        the address for mysql,default:10.146.145.67
  -user string
        the username for login mysql,default:dbuser

  -pwd     string
        the password for login mysql by the username,default:Admin@123
  -db     string
        the port for me to listen on,default:auditlogdb
  -tables string
        the tables will export data, multi tables separator by comma, default:op_log,sc_log,sys_log
    `
)

func init() {

    port := flag.Int("port", 32085, "the port for mysql,default:32085")
    addr := flag.String("addr", "10.146.145.67", "the address for mysql,default:10.146.145.67")
    user := flag.String("user", "dbuser", "the username for login mysql,default:dbuser")
    pwd := flag.String("pwd", "Admin@123", "the password for login mysql by the username,default:Admin@123")
    db := flag.String("db", "auditlogdb", "the port for me to listen on,default:auditlogdb")
    tabs := flag.String("tables", "op_log,sc_log,sys_log", "the tables will export data, multi tables separator by comma, default:op_log,sc_log,sys_log")

    flag.Usage = usage

    flag.Parse()

    tables = append(tables, strings.Split(*tabs, ",")...)

    dataSourceName = fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8", *user, *pwd, *addr, *port, *db)
}

func main() {

    count := len(tables)
    ch := make(chan bool, count)

    db, err := sql.Open(driverNameMysql, dataSourceName)
    defer db.Close()
    if err != nil {
        panic(err.Error())
    }

    // Open doesn't open a connection. Validate DSN data:
    err = db.Ping()
    if err != nil {
        panic(err.Error())
    }

    for _, table := range tables {
        go querySQL(db, table, ch)
    }

    for i := 0; i < count; i++ {
        <-ch
    }
    fmt.Println("Done!")
}

func querySQL(db *sql.DB, table string, ch chan bool) {
    fmt.Println("開始處理：", table)
    rows, err := db.Query(fmt.Sprintf("SELECT * from %s", table))

    if err != nil {
        panic(err)
    }

    columns, err := rows.Columns()
    if err != nil {
        panic(err.Error())
    }

    //values：一行的全部值,把每一行的各個字段放到values中，values長度==列數
    values := make([]sql.RawBytes, len(columns))
    // print(len(values))

    scanArgs := make([]interface{}, len(values))
    for i := range values {
        scanArgs[i] = &values[i]
    }

    //存全部行的內容totalValues
    totalValues := make([][]string, 0)
    for rows.Next() {

        //存每一行的內容
        var s []string

        //把每行的內容添加到scanArgs，也添加到了values
        err = rows.Scan(scanArgs...)
        if err != nil {
            panic(err.Error())
        }

        for _, v := range values {
            s = append(s, string(v))
            // print(len(s))
        }
        totalValues = append(totalValues, s)
    }

    if err = rows.Err(); err != nil {
        panic(err.Error())
    }
    writeToCSV(table+".csv", columns, totalValues)
    ch <- true
}

//writeToCSV
func writeToCSV(file string, columns []string, totalValues [][]string) {
    f, err := os.Create(file)
    // fmt.Println(columns)
    defer f.Close()
    if err != nil {
        panic(err)
    }
    //f.WriteString("\xEF\xBB\xBF")
    w := csv.NewWriter(f)
    for i, row := range totalValues {
        //第一次寫列名+第一行數據
        if i == 0 {
            w.Write(columns)
            w.Write(row)
        } else {
            w.Write(row)
        }
    }
    w.Flush()
    fmt.Println("處理完畢：", file)
}

func usage() {
    fmt.Fprint(os.Stderr, helpInfo)
    flag.PrintDefaults()
}
複製代碼

操做示例：

編譯代碼生成可執行文件：

go build mysqldataexport.go複製代碼

數據庫中有test2庫下的test表：

導出其中的數據：

.\mysqldataexport.exe -port=3306 -addr="localhost" -user="root" -pwd="mysql" -db="test2" -tables="test"複製代碼

導出結果以下：

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