注册 登录  
 加关注
   显示下一条  |  关闭
温馨提示!由于新浪微博认证机制调整,您的新浪微博帐号绑定已过期,请重新绑定!立即重新绑定新浪微博》  |  关闭

NET START HERE

研究C/C++、网络/通信/协议编程、网络安全、软件安全

 
 
 

日志

 
 

Linux/windows c++使用mysql connector示例程序和异常处理  

2015-10-17 10:27:06|  分类: 默认分类 |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |
mysql connector是一个很好的mysql连接库,下面是一些使用示例,希望对大家有些帮助。
官方文档地址:http://dev.mysql.com/doc/connector-cpp/en/connector-cpp-getting-started-examples.html


1、 查询(select)
// ...
sql::Connection *con;
sql::Statement *stmt;
sql::ResultSet *res;
// ...
stmt = con->createStatement();
// ...

res = stmt->executeQuery("SELECT id, label FROM test ORDER BY id ASC");
while (res->next()) {
// You can use either numeric offsets...
cout << "id = " << res->getInt(1); // getInt(1) returns the first column
// ... or column names for accessing results.
// The latter is recommended.
cout << ", label = '" << res->getString("label") << "'" << endl;
}

//You must free sql::Statement, sql::Connection and sql::ResultSet objects explicitly using delete
delete res;//ResultSet每次使用完需要释放,否则会造成内存泄露
delete stmt;
delete con;

2、 更新(update/delete/insert/replace)
sql::mysql::MySQL_Driver *driver;
sql::Connection *con;
sql::Statement *stmt;

driver = sql::mysql::get_mysql_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "user", "password");

stmt = con->createStatement();
stmt->execute("USE " EXAMPLE_DB);
stmt->execute("DROP TABLE IF EXISTS test");
stmt->execute("CREATE TABLE test(id INT, label CHAR(1))");
stmt->execute("INSERT INTO test(id, label) VALUES (1, 'a')");

delete stmt;
delete con;

3、 使用try..catch...异常处理示例
try {
sql::Driver *driver;
sql::Connection *con;
sql::Statement *stmt;
sql::ResultSet *res;

/* Create a connection */
driver = get_driver_instance();
con = driver->connect("tcp://127.0.0.1:3306", "root", "root");
/* Connect to the MySQL test database */
con->setSchema("test");

stmt = con->createStatement();
res = stmt->executeQuery("SELECT 'Hello World!' AS _message");
while (res->next()) {
cout << "\t... MySQL replies: ";
/* Access column data by alias or column name */
cout << res->getString("_message") << endl;
cout << "\t... MySQL says it again: ";
/* Access column fata by numeric offset, 1 is the first column */
cout << res->getString(1) << endl;
}
delete res;
delete stmt;
delete con;

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

  评论这张
 
阅读(567)| 评论(0)
推荐 转载

历史上的今天

评论

<#--最新日志,群博日志--> <#--推荐日志--> <#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇,下一篇--> <#-- 热度 --> <#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->
 
 
 
 
 
 
 
 
 
 
 
 
 
 

页脚

网易公司版权所有 ©1997-2017