MySQL connector c++使用笔记

MySQL的connector官方地址: http://dev.mysql.com/downloads/connector/

针对c++来说, 可以选择c或者c++的库.

c++的实现是参考了java的JDBC, 所以熟悉JDBC的人可以很快上手.

定义这样几个类

• Connection

• Driver

• PreparedStatement

• ResultSet

• ResultSetMetaData

• Statement

下载安装mysql connector c++, 启动mysql, 使用test database.

准备数据(使用官方提供的示例数据, 参考 MySQL手册 3.3.3 http://dev.mysql.com/doc/refman/5.1/zh/tutorial.html)

CREATE TABLE pet (
name VARCHAR(20),
owner VARCHAR(20),
species VARCHAR(20),
sex CHAR(1),
birth DATE,
death DATE
);

导入数据(路径可以为相对路径或绝对路径)

LOAD DATA LOCAL INFILE 'pet.txt' INTO TABLE pet;

pet.txt(修改中间的间隔为\t)

Fluffy	Harold	cat	f	1993-02-04	\N
Claws	Gwen	cat	m	1994-03-17	\N
Buffy	Harold	dog	f	1989-05-13	\N
Fang	Benny	dog	m	1990-08-27	\N
Bowser	Diane	dog	m	1979-08-31	1995-07-29
Chirpy	Gwen	bird	f	1998-09-11	\N
Whistler	Gwen	bird	\N	1997-12-09	\N
Slim	Benny	snake	m	1996-04-29	\N

示例代码

#include <iostream>
#include "mysql_driver.h"
#include "mysql_connection.h"
#include "cppconn/driver.h"
#include "cppconn/statement.h"
#include "cppconn/prepared_statement.h"
#include "cppconn/metadata.h"
#include "cppconn/exception.h"

int main() {
	const char* user = "root";
	const char* passwd = "";
	const char* host = "tcp://localhost:3306";
	const char* database = "test";
	try {
		sql::mysql::MySQL_Driver* driver =
		        sql::mysql::get_mysql_driver_instance();
		sql::Connection* conn = driver->connect(host, user, passwd);
		conn->setSchema(database);
		std::cout << "status: " << conn->isClosed() << std::endl;
		sql::Statement *stmt = conn->createStatement();
		sql::ResultSet *res = stmt->executeQuery("select 1;");
		while (res->next()) {
			std::cout << res->getInt(1) << std::endl;
		}

		res = stmt->executeQuery("select * from pet;");
		while (res->next()) {
			std::cout << res->getString(1) << ",";
			std::cout << res->getString(2) << ",";
			std::cout << res->getString(3) << ",";
			std::cout << res->getInt(4) << ",";
			std::cout << res->getString(5) << ",";
			std::cout << res->getString(6) << std::endl;
		}

		delete res;
		delete stmt;
		delete conn;
	} catch (sql::SQLException& e) {
		std::cout << "# ERR: SQLException in " << __FILE__;
		std::cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << std::endl;
		std::cout << "# ERR: " << e.what();
		std::cout << " (MySQL error code: " << e.getErrorCode();
		std::cout << ", SQLState: " << e.getSQLState() << " )" << std::endl;
	}
	return 0;
}

运行结果

status: 0
1
Fluffy,Harold,cat,0,1993-02-04,
Claws,Gwen,cat,0,1994-03-17,
Buffy,Harold,dog,0,1989-05-13,
Fang,Benny,dog,0,1990-08-27,
Bowser,Diane,dog,0,1979-08-31,1995-07-29
Chirpy,Gwen,bird,0,1998-09-11,
Whistler,Gwen,bird,0,1997-12-09,
Slim,Benny,snake,0,1996-04-29,

参考文档:

1. 官方手册: http://dev.mysql.com/doc/refman/5.6/en/connector-cpp.html
2. MySQL Connector/C++文档翻译: http://www.cnblogs.com/dvwei/archive/2013/04/18/3029464.html