编译和使用 MySQL C++ Connector

记录编译 mysql C and C++ connector 和简单访问数据库.

环境: vs2012,  mysql 5.6.13, 基于x64

0. 软件包

mysql http://dev.mysql.com/downloads/mysql/

c connector  http://dev.mysql.com/downloads/connector/c/

c++ connector依赖C connector, mysql的binary里面有编译好的C connector lib, 如果你用的编译器和mysql 一样, 那么不用重新编译

c++ connector http://dev.mysql.com/downloads/connector/cpp/

boost http://sourceforge.net/projects/boost/files/boost/1.54.0/

c++ Connector 依赖boost. 本来还尝试过vs2013, 但是boost1.54在vs2013 preview下编译有问题, 我没有试低版本的boost.

cmake http://www.cmake.org/cmake/resources/software.html

mysql的project是基于cmake. cmake可以生成vc project, 使用起来挺方便

1. 环境bat vs2012x64env.bat

call "C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\vcvarsall.bat" amd64
set PATH=%PATH%;D:\mybin\cmake-2.8.11.1-win32-x86\bin
set MYSQL_DIR=D:\mybin\mysql-5.6.13-winx64
set BOOST_ROOT=D:\mybin\boost_1_54_0
cmd /K

2. Generate vc project

C connector
cmake -G "Visual Studio 11 Win64"
build project libmysql, 只需要一个lib, 不用编译所有, debug模式下, 自带trace

C++ connector

如果想要打开trace, 加-DMYSQLCPPCONN_TRACE_ENABLE:BOOL=1, 实际还没有结束, 大概是cmake生成project的错误, 需要手动添加预定义宏 CPPCONN_TRACE_ENABLED 
cmake -DMYSQLCPPCONN_TRACE_ENABLE:BOOL=1 -G "Visual Studio 11 Win64"
build project mysqlcppconn

把头文件copy在mysql下, 方便些, 不是必须
copy D:\mybin\mysql-connector-c++-1.1.3\cppconn  D:\mybin\mysql-5.6.13-winx64\include\cppconn

3.Demo, 贴代码了

#include <iostream>

#include <memory>
#include <string>
#include <cppconn\driver.h>
#include <cppconn\exception.h>
#include <cppconn\resultset.h>
#include <cppconn\statement.h>
#include <cppconn\prepared_statement.h>

static const char*  g_sqltrance = "";//"d:t:O,client.trace";
static const int    g_enable_debug_trace = 0;

int main()
try
{

std::cout << "connect db start ... \n";
    auto driver = get_driver_instance();

std::unique_ptr<sql::Connection> con(driver->connect("tcp://127.0.0.1:3306", "root", ""));
    con->setClientOption("libmysql_debug",  g_sqltrance);
    con->setClientOption("clientTrace",    &g_enable_debug_trace);
    con->setSchema("test");

// create table
    std::unique_ptr<sql::Statement> stmt(con->createStatement());
    stmt->execute("drop table if exists test");
    stmt->execute("create table test(id int, label char(1))");

// insert
    stmt->execute("insert into test(id, label) values (1, 'a')");
    stmt->execute("insert into test(id, label) values (2, 'b')");
    stmt->execute("insert into test(id, label) values (3, 'c')");

// update
    stmt->executeUpdate("update test set label='e' where id=2");

// prepared statement
    std::unique_ptr<sql::PreparedStatement> prep_stmt(con->prepareStatement("insert into test(id, label) values(?, ?)"));
    size_t n = 5;
    while (n++ < 30)
    {
        prep_stmt->setInt(1, n);
        prep_stmt->setString(2, sql::SQLString(std::string(1, 'A' + n)));
        prep_stmt->execute();
    }

// query
    std::unique_ptr<sql::ResultSet> res(stmt->executeQuery("select id, label from test order by id asc"));
    while (res->next())
    {
        std::cout << "id = " << res->getInt(1) << "  label = " << res->getString("label") << "\n";
    }

return 0;
}
catch (sql::SQLException & e)
{
    std::cout << "SQLException : \n    "
              << e.what() 
              << "\n    ErrorCode " << e.getErrorCode() << " "
              << "\n    SQLState " << e.getSQLState() << "\n";
}
catch (...)
{
    std::cout << "uncatch exception\n";
}

4. 如果想导入sample数据库

http://dev.mysql.com/doc/index-other.htmldownload world database InnoDB version
mysql -u root
create database world;
use world;
source c:\world_innodb.sqlshow tables;