connect oracle database in linux

build go file in linux server ,test connect to oracle db

在linux server上，编译go代码，测试连接oracle数据库。

I am coding on mac os and I will deploy it to a linux server。 cross compile break down! so~。

安装golang 确保golang运行正常，可以跳过准备工作。

准备工作

打算下载下go-oci8发现报错

go get github.com/mattn/go-oci8

尝试了 curl,发现也报错

curl https://github.com/mattn/go-oci8
curl: (35) SSL connect error

yum安装nss发现404

yum update nss

更新 yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bac
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
yum clean all
yum makecache

再次更新nss,成功

yum update nss

再次安装go-oci8

go get github.com/mattn/go-oci8

下载instantclient

instantclient-basic-macos.x64-11.2.0.4.0
instantclient-sdk-macos.x64-11.2.0.4.0
download http://www.oracle.com/technetwork/topics/intel-macsoft-096467.html

解压instantclient

unzip instantclient-basic-linux.x64-11.2.0.4.0.zip
unzip instantclient-sdk-linux.x64-11.2.0.4.0.zip
[root@localhost instantclient_11_2]# pwd
/root/instantclient_11_2
[root@localhost instantclient_11_2]# ls -al
总用量 183540
drwxr-xr-x   3 root root      4096 7月  19 15:01 .
dr-xr-x---. 44 root root      4096 7月  19 15:01 ..
-rwxrwxr-x   1 root root     25420 8月  25 2013 adrci
-rw-rw-r--   1 root root       439 8月  25 2013 BASIC_README
-rwxrwxr-x   1 root root     47860 8月  25 2013 genezi
-rwxrwxr-x   1 root root  53865194 8月  25 2013 libclntsh.so.11.1
-r-xr-xr-x   1 root root   7996693 8月  25 2013 libnnz11.so
-rwxrwxr-x   1 root root   1973074 8月  25 2013 libocci.so.11.1
-rwxrwxr-x   1 root root 118738042 8月  25 2013 libociei.so
-r-xr-xr-x   1 root root    164942 8月  25 2013 libocijdbc11.so
-r--r--r--   1 root root   2091135 8月  25 2013 ojdbc5.jar
-r--r--r--   1 root root   2739616 8月  25 2013 ojdbc6.jar
drwxrwxr-x   4 root root      4096 8月  25 2013 sdk
-rwxrwxr-x   1 root root    192365 8月  25 2013 uidrvci
-rw-rw-r--   1 root root     66779 8月  25 2013 xstreams.jar
[root@localhost instantclient_11_2]#

[root@localhost instantclient_11_2]# cp libclntsh.so.11.1 libclntsh.so
[root@localhost instantclient_11_2]# ln libclntsh.so /usr/lib/libclntsh.so
[root@localhost instantclient_11_2]# ln libocci.so.11.1 /usr/lib/libocci.so
[root@localhost instantclient_11_2]# ln libociei.so /usr/lib/libociei.so
[root@localhost instantclient_11_2]# ln libnnz11.so /usr/lib/libnnz11.so

下载pkg-config

[root@localhost ~]# wget http://pkgconfig.freedesktop.org/releases/pkg-config-0.29.2.tar.gz
--2018-07-19 15:21:50--  http://pkgconfig.freedesktop.org/releases/pkg-config-0.29.2.tar.gz
正在解析主机 pkgconfig.freedesktop.org... 131.252.210.176, 2610:10:20:722:a800:ff:feda:470f
正在连接 pkgconfig.freedesktop.org|131.252.210.176|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 301 Moved Permanently
位置：https://pkg-config.freedesktop.org/releases/pkg-config-0.29.2.tar.gz [跟随至新的 URL]
--2018-07-19 15:21:51--  https://pkg-config.freedesktop.org/releases/pkg-config-0.29.2.tar.gz
正在解析主机 pkg-config.freedesktop.org... 131.252.210.176, 2610:10:20:722:a800:ff:feda:470f
正在连接 pkg-config.freedesktop.org|131.252.210.176|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：2016830 (1.9M) [application/x-gzip]
正在保存至: “pkg-config-0.29.2.tar.gz”

60% [==============================================================================>                                                     ] 1,212,416    389K/s eta(英国中部时64% [====================================================================================>                                               ] 1,310,720    393K/s eta(英国中部时70% [============================================================================================>                                       ] 1,425,408    401K/s eta(英国中部时76% [===================================================================================================>                                ] 1,540,096    408K/s eta(英国中部时82% [===========================================================================================================>                        ] 1,654,784    414K/s eta(英国中部时87% [==================================================================================================================>                 ] 1,769,472    419K/s eta(英国中部时93% [==========================================================================================================================>         ] 1,884,160    424K/s eta(英国中部时99% [=================================================================================================================================>  ] 1,998,848    428K/s eta(英国中部时100%[===================================================================================================================================>] 2,016,830    432K/s   in 4.6s

2018-07-19 15:21:58 (432 KB/s) - 已保存 “pkg-config-0.29.2.tar.gz” [2016830/2016830])

[root@localhost ~]# tar xvf pkg-config-0.29.2.tar.gz

[root@localhost ~]# cd pkg-config-0.29.2
[root@localhost pkg-config-0.29.2]# ./configure  --with-internal-glib
[root@localhost pkg-config-0.29.2]# make
[root@localhost pkg-config-0.29.2]# make install

新建oci8.pc

[root@localhost instantclient_11_2]# touch oci8.pc

设置环境变量

[root@localhost ~]# vi .bash_profile

增加如下内容

PKG_CONFIG_PATH=/root/instantclient_11_2
LD_LIBRARY_PATH=/root/instantclient_11_2
export PKG_CONFIG_PATH
export LD_LIBRARY_PATH

测试pkg-config oci8

[root@localhost instantclient_11_2]# source ~/.bash_profile
[root@localhost instantclient_11_2]# pkg-config --modversion oci8
12.2
[root@localhost instantclient_11_2]# pkg-config  oci8
[root@localhost instantclient_11_2]# pkg-config --libs oci8
-L/root/instantclient_11_2 -lclntsh

编写oracle_db.go

package main

import (
    "fmt"
    _ "github.com/mattn/go-oci8"
    "database/sql"
)

func main() {
    db, err := sql.Open("oci8", "username/pwd@ip:1521/dbname")
    if err != nil {
        fmt.Println("abc", 123, err)
        return
    }
    defer db.Close()

    if err = db.Ping(); err != nil {
        fmt.Printf("Error connecting to the database: %s\n", err)
        return
    }

    rows, err := db.Query("select 2+2 from dual")
    if err != nil {
        fmt.Println("Error fetching addition")
        fmt.Println(err)
        return
    }
    defer rows.Close()

    for rows.Next() {
        var sum int
        rows.Scan(&sum)
        fmt.Printf("2 + 2 always equals: %d\n", sum)
    }
}

直接运行go文件

[root@localhost ~]# go run oracle_db.go
2 + 2 always equals: 4

build,运行可执行文件

[root@localhost ~]# go build oracle_db.go
[root@localhost ~]# file oracle_db
oracle_db: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped
[root@localhost ~]# ./oracle_db
2 + 2 always equals: 4