使用go語言操作db2

操作系統 ： CentOS7.3.1611_x64

go語言版本：1.8.3 linux/amd64

db2版本： db2_v101_linuxx64_expc

問題描述

怎么使用go語言在CentOS環境下操作db2數據庫？

解決方案

go語言操作數據庫相關信息可以參考如下鏈接：

https://github.com/golang/go/wiki/SQLDrivers

使用db2cli

db2cli地址： https://bitbucket.org/phiggins/go-db2-cli/src

下載源碼，並將源碼放到如下路徑：

/usr/local/go/src/bitbucket.org/phiggins/go-db2-cli

[root@localhost go-db2-cli]# pwd
/usr/local/go/src/bitbucket.org/phiggins/go-db2-cli
[root@localhost go-db2-cli]# ls
LICENSE  mgodbc.go  README.md
[root@localhost go-db2-cli]#

這里直接使用bitbucket提供的示例代碼 (db2test.go)：

package main
// E-Mail : [e-mail]
import (
    _ "bitbucket.org/phiggins/go-db2-cli"
    "database/sql"
    "flag"
    "fmt"
    "os"
    "time"
)

var (
    connStr = flag.String("conn", "", "connection string to use")
    repeat  = flag.Uint("repeat", 1, "number of times to repeat query")
)

func usage() {
    fmt.Fprintf(os.Stderr, `usage: %s [options]

%s connects to DB2 and executes a simple SQL statement a configurable
number of times.

Here is a sample connection string:

DATABASE=MYDBNAME; HOSTNAME=localhost; PORT=60000; PROTOCOL=TCPIP; UID=username; PWD=password;
`, os.Args[0], os.Args[0])
    flag.PrintDefaults()
    os.Exit(1)
}

func execQuery(st *sql.Stmt) error {
    rows, err := st.Query()
    if err != nil {
        return err
    }
    defer rows.Close()
    for rows.Next() {
        var t time.Time
        err = rows.Scan(&t)
        if err != nil {
            return err
        }
        fmt.Printf("Time: %v\n", t)
    }
    return rows.Err()
}

func dbOperations() error {
    db, err := sql.Open("db2-cli", *connStr)
    if err != nil {
        return err
    }
    defer db.Close()
    st, err := db.Prepare("select current timestamp from sysibm.sysdummy1")
    if err != nil {
        return err
    }
    defer st.Close()

    for i := 0; i < int(*repeat); i++ {
        err = execQuery(st)
        if err != nil {
            return err
        }
    }
    return nil
}

func main() {
    flag.Usage = usage
    flag.Parse()
    if *connStr == "" {
        fmt.Fprintln(os.Stderr, "-conn is required")
        flag.Usage()
    }

    if err := dbOperations(); err != nil {
        fmt.Fprintln(os.Stderr, err)
    }
}

[root@localhost db2Test]# ls
build.sh  db2Test.go  run.sh
[root@localhost db2Test]# ./build.sh
[root@localhost db2Test]# ./run.sh
Time: 2017-09-25 22:41:21.701142 +0000 UTC
[root@localhost db2Test]#

build.sh :

#!/bin/bash

DB2HOME=/home/db2inst1/sqllib
export CGO_LDFLAGS=-L$DB2HOME/lib
export CGO_CFLAGS=-I$DB2HOME/include

go build db2Test.go

run.sh :

#! /bin/bash

DB2HOME=/home/db2inst1/sqllib
export LD_LIBRARY_PATH=$DB2HOME/lib

./db2Test -conn 'DATABASE=testdb; HOSTNAME=127.0.0.1; PORT=50000; PROTOCOL=TCPIP; UID=db2inst1; PWD=123456;'

好，就這些了，希望對你有幫助。

本文github地址：

https://github.com/mike-zhang/mikeBlogEssays/blob/master/2017/20171202_使用go語言操作db2.rst

歡迎補充