C++ VS2019连接数据库记录

记录使用Connector C++及VS2019连接数据库的过程 Step1：下载Mysql 8.0.29 Mysql官网下载地址，建议下载MSI安装程序同时，下载SourceCode,方便查看API的用法

Ps:官方Connector C++说明截取如下
On Windows platforms, Commercial and Community Connector/C++distributions require the Visual C++ Redistributable for VisualStudio. The Redistributable is available at the Visual Studio DownloadCenter; install it before installing Connector/C++. Theacceptable Redistributable versions depend on your Connector/C++version:
•Connector/C++ 8.0.19 and higher: VC++ Redistributable 2017 orhigher.
•Connector/C++ 8.0.14 to 8.0.18: VC++ Redistributable 2015 orhigher.

Step2:安装Mysql 8.0.29（安装之前需要安装python-3.10.4-amd64） Step3:新建自己的工程 Step4:将Connector C++ 8.0include目录下面的三个文件夹copy到自己的工程路径下面去，同时将Connector C++ 8.0lib64目录下面所有的静态库以及动态库copy到自己工程路径下

Step5:配置工程属性，添加头文件包含，附加依赖项

Step6:直接上范例代码（这部分代码是网上查的直接用的别人的）

#include 
#include "jdbc/mysql_connection.h"
#include "jdbc/mysql_driver.h"
#include "jdbc/cppconn/statement.h"
#include "jdbc/cppconn/prepared_statement.h"


using namespace std;
using namespace sql;

int main()
{
	sql::PreparedStatement* prep_stmt;
	int updatecount = 0;

    std::cout << "Hello World!n";
    std::cout << "test mysqln";

	sql::mysql::MySQL_Driver* driver = NULL;
	sql::Connection* conn = NULL;
	driver = sql::mysql::get_mysql_driver_instance();
	if (driver == NULL)
	{
		std::cout <<"driver is null" << std::endl;
	}

	conn = driver->connect("tcp://localhost:3306", "root", "123456");
	if (conn == NULL)
	{
		std::cout << "conn is null" << std::endl;
	}
	std::cout << "connect suceess" << std::endl;


	//查询
	int flag = 0;
	sql::Statement* stmt = conn->createStatement();
	sql::ResultSet* res;
	res = stmt->executeQuery("SELECT * FROM cms_device");
	while (res->next())
	{
		cout << res->getInt("id") << endl;
		cout << res->getString("phone").c_str() << endl;
		cout << res->getString("imsi").c_str() << endl;
	}
	//插入
	conn->setAutoCommit(0);//关闭自动提交
	res->first();
	flag = 0;
	while (res->next())
	{
		if (strcmp(res->getString("imsi").c_str(), "460010010000100") == 0)
		{
			flag = 1;
			break;
		}
	}
	if (flag == 0) {
		prep_stmt = conn->prepareStatement("INSERT INTO cms_device (id,phone,imsi) VALUES (111,?,?)");
		prep_stmt->setString(1, "15043214321");
		prep_stmt->setString(2, "460010010000100");
		updatecount = prep_stmt->executeUpdate();
	}
	Savepoint* savept;
	savept = conn->setSavepoint("SAVEPT1");
	res->first();
	flag = 0;
	while (res->next())
	{
		if (strcmp(res->getString("imsi").c_str(), "460010010000101") == 0)
		{
			flag = 1;
			break;
		}
	}
	if (flag == 0) {
		prep_stmt = conn->prepareStatement("INSERT INTO cms_device (phone,imsi) VALUES (?,?)");
		prep_stmt->setString(1, "15043214321");
		prep_stmt->setString(2, "460010010000101");
		updatecount = prep_stmt->executeUpdate();
	}
	conn->rollback(savept);
	conn->releaseSavepoint(savept);
	conn->commit();
	//更新
	conn->setAutoCommit(1);//打开自动提交
	prep_stmt = conn->prepareStatement("update cms_device set phone=? where phone=?");
	prep_stmt->setString(1, "15011111111");
	prep_stmt->setString(2, "15043214321");
	updatecount = prep_stmt->executeUpdate();


	system("pause");

}