MySQL Connector/C++庫的使用

1、下載Connector/C++庫

官網地址：

https://dev.mysql.com/downloads/connector/cpp/

能夠下載源代碼本身編譯，也能夠根據不一樣的OS環境下載編譯好的包，這裏下來mysql-connector-c++-1.1.9-linux-ubuntu16.04-x86-64bit.tar.gz

2、解壓

這裏放在mysql的安裝目錄/opt/mysql下：

$ cd /opt/mysql/
$ sudo tar xzvf ~/mysql-connector-c++-1.1.9-linux-ubuntu16.04-x86-64bit.tar.gz
$ sudo ln -s mysql-connector-c++-1.1.9-linux-ubuntu16.04-x86-64bit mysql-connector-c++

把/opt/mysql/mysql-connector-c++/lib放到動態庫搜索路徑或用,-rpath=在編譯時指定路徑。

3、編譯運行

建庫腳本：

-- phpMyAdmin SQL Dump
-- version 4.6.4
-- https://www.phpmyadmin.net/
--
-- Host: localhost
-- Generation Time: 2017-12-30 08:49:43
-- 服務器版本： 5.7.14
-- PHP Version: 5.6.26

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Database: `mymotif`
--

-- --------------------------------------------------------

--
-- 表的結構 `users`
--

CREATE TABLE `users` (
  `id` int(11) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `fullname` varchar(40) DEFAULT NULL,
  `password` varchar(12) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- 轉存表中的數據 `users`
--

INSERT INTO `users` (`id`, `name`, `fullname`, `password`) VALUES
(1, 'ed', 'Ed Jones', 'edspassword'),
(2, 'wendy', 'Wendy Williams', 'foobar'),
(3, 'mary', 'Mary Contrary', 'xxg527'),
(4, 'lisa', 'lisa Contrary', 'ls123'),
(5, 'cred', 'cred Flinstone', 'bla123'),
(6, 'fred', 'Fred Flinstone', 'blah'),
(7, 'jack', 'Jack Bean', 'gjffdd'),
(8, 'ed', 'Ed Jones', 'edspassword'),
(14, 'jack', 'Jack Bean', 'gjffdd'),
(15, 'ed', 'Ed Jones', '888'),
(16, 'wendy', 'Wendy Williams', 'foobar'),
(17, 'mary', 'Mary Contrary', '123'),
(18, 'lisa', 'lisa Contrary', 'ls123'),
(19, 'cred', 'cred Flinstone', 'bla123'),
(20, 'fred', 'Fred Flinstone', 'blah'),
(21, 'jack', 'Jack Bean', 'gjffdd'),
(22, 'wxw01', 'Jack wxw', '123'),
(23, 'wxw02', 'Jack wxw2', '234');

--
-- Indexes for dumped tables
--

--
-- Indexes for table `users`
--
ALTER TABLE `users`
  ADD PRIMARY KEY (`id`);

--
-- 在導出的表使用AUTO_INCREMENT
--

--
-- 使用表AUTO_INCREMENT `users`
--
ALTER TABLE `users`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=24;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

c++代碼testcppconn.cpp 

#include<iostream>
#include <mysql_connection.h>
#include <mysql_driver.h>
#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>
#include <cppconn/prepared_statement.h>
using namespace std;

int main()
{
	sql::mysql::MySQL_Driver *driver;
	sql::Connection *conn;
	sql::Statement *state;
	sql::ResultSet *result;
	driver = sql::mysql::get_driver_instance();
	conn = driver->connect("localhost", "your-user", "your-passwd");
	state = conn->createStatement();
	state->execute("use test");
	result = state->executeQuery("select * from users");
	//// 輸出查詢  
	while (result->next()!=NULL)
	{
		cout<<result->getString("id")<<"	";
		cout<<result->getString("fullname")<<endl;
	}
	return 0;
}

編譯運行

$ g++ testcppconn.cpp -o testcppconn  -I/opt/mysql/mysql-connector-c++/include -L/opt/mysql/mysql-connector-c++/lib -lmysqlcppconn -Wl,-rpath=/opt/mysql/mysql-connector-c++/lib
$ ./testcppconn 
1	Ed Jones
2	Wendy Williams
3	Mary Contrary
4	lisa Contrary
5	cred Flinstone
6	Fred Flinstone
7	Jack Bean
8	Ed Jones
14	Jack Bean
15	Ed Jones
16	Wendy Williams
17	Mary Contrary
18	lisa Contrary
19	cred Flinstone
20	Fred Flinstone
21	Jack Bean
22	Jack wxw
23	Jack wxw2

pkg-config的使用，寫個mysqlconncpp.pc放在$PKG_CONFIG_PATH路徑裏：

prefix=/opt/mysql/mysql-connector-c++
includedir=${prefix}/include
libdir=${prefix}/lib

Name: mysqlcppconn 
Description: MySQL  Connector/C++ library
Version: 1.1.9
Cflags: -I${includedir} 
Libs: -L${libdir} -lmysqlcppconn
Libs.private: -lpthread -lm -lrt -ldl

這樣編譯命令就能夠變成這樣：

$ g++ -o testcppconn testcppconn.cpp `pkg-config --libs --cflags mysqlconncpp` -Wl,-rpath=/opt/mysql/mysql-connector-c++/lib