第12月第15天 mysqlx boost reswift

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INSTALL PLUGIN mysqlx SONAME 'mysqlx.so'

https://yq.aliyun.com/articles/38288

2. boost

        boost::shared_ptr< MySQL_Driver > newDriver;

        newDriver.reset(new MySQL_Driver(dummy));

        driver[dummy] = newDriver;

        return newDriver.get();

...

MySQL_Driver::MySQL_Driver(const ::sql::SQLString & clientLib)

{

    try {

        proxy.reset(::sql::mysql::NativeAPI::createNativeDriverWrapper(clientLib));

    }    catch(std::runtime_error & e)    {

        throw sql::InvalidArgumentException(e.what());

    }

}

...

/* {{{ createStMysqlWrapper() */

NativeDriverWrapper *

createNativeDriverWrapper(const SQLString & clientFileName)

{

    return new MySQL_NativeDriverWrapper(clientFileName);

}

/* }}} */

/* {{{ MySQL_NativeDriverWrapper::MySQL_NativeDriverWrapper() */

MySQL_NativeDriverWrapper::MySQL_NativeDriverWrapper(const ::sql::SQLString & clientFileName)

    : api(::sql::mysql::NativeAPI::getCApiHandle(clientFileName))

{

}

/* }}} */

...

boost::shared_ptr< IMySQLCAPI > getCApiHandle(const sql::SQLString & name)

{

#ifdef MYSQLCLIENT_STATIC_BINDING

    return LibmysqlStaticProxy::theInstance();

#else

https://codeload.github.com/mysql/mysql-connector-cpp/tar.gz/1.1.9

import UIKit

class ViewController: UIViewController {

    var finishedCallBack: ( (dataString: String) -> () )?

    override func viewDidLoad() {

        super.viewDidLoad()

        //解决方式三: [unowned self]  跟 _unsafe_unretained 类似

        loadData { [unowned self] (dataString) -> () in

            print("\(dataString) \(self.view)")

        }

    }

    func method2() {

        //解决方式二:  在swift中 有特殊的写法  [weak self]

        loadData { [weak self] (dataString) -> () in

            //以后在闭包中中 使用self 都是若引用的

            print("\(dataString) \(self?.view)")

        }

    }

    func method1() {

        // 解决方式一: weak , OC中类似方法__weak

        weak var weakSelf = self

        loadData { (dataString) -> () in

            print("\(dataString) \(weakSelf?.view)")

        }

    }