三、odataproducer代码改写

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这两周导师一直在美国，所以联系起来很不方便，加上现有的资料很少，所以只能自己摸索，上周确定了思路，导师也说思路是正确的，那么这周就要对代码进行改写。

要改写的代码包括IDataServiceMetaDataProvider，IDataServiceQuery Provider，IDataServiceQueryProvider2，IServiceProvider ，IExpressionProvider，Metadata Mapping这几个部分，每一个部分的功能在上周的报告中已经说过，这里就不在赘述，那么我们一个个来。

首先是IDataServiceMetaDataProvider，用来描述实体集和实体的属性及实体间的联系，我们选择SugarCRM中的Contacts实体，首先定义Contacts实体,我们选取

id;   序号
first_name;    名
last_name;    姓
phone_mobile;手机
phone_fax; 传真
primary_address_street; 地址-街道
primary_address_city;地址-城市

primary_address_country;地址-国家
birthdate; 生日
其中id为主键，下面会用到

class Contacts{    //Key Edm.Int32    public $id;    //Edm.String    public $first_name;    //Edm.String    public $last_name;    //Edm.String    public $phone_mobile;    //Edm.String    public $phone_fax;    //Edm.String    public $primary_address_street;    //Edm.String    public $primary_address_city;    //Edm.String    public $primary_address_country;    //Edm.String    public $birthdate;    //Edm.String}

然后创建元数据类class CreateSugarCRMMetadata

    public static function create()    {        $metadata = new ServiceBaseMetadata('SugarCRMEntities', 'SugarCRM');            //Register the entity (resource) type 'Contacts'        $ContactsEntityType = $metadata->addEntityType(new ReflectionClass('Contacts'), 'Contacts', 'SugarCRM');        $metadata->addKeyProperty($ContactsEntityType, 'id', EdmPrimitiveType::INT32);        $metadata->addPrimitiveProperty($ContactsEntityType, 'first_name', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'last_name', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'primary_address_street', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'primary_address_city', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'primary_address_country', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'phone_mobile', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'phone_fax', EdmPrimitiveType::STRING);        $metadata->addPrimitiveProperty($ContactsEntityType, 'birthdate', EdmPrimitiveType::DATETIME);            $ContactsResourceSet = $metadata->addResourceSet('Contacts', $ContactsEntityType);        return $metadata;    }

首先初始化了metadata对象，继承基类ServiceBaseMetadata，为其添加实体Contacts

然后为实体添加属性，分别为上面我们定义的属性，除了id使用添加主键的方法addKeyProperty，其他调用addPrimitiveProperty函数，最后将实体Contacts加入实体集

然后我们看IDataServiceQuery Provider和IDataServiceQuery Provider2这里我们直接用IDataServiceQuery Provider2

首先定义MySQL配置

/** The name of the database for WordPress */define('DB_NAME', 'SugarCRM');/** MySQL database username */define('DB_USER', 'root');/** MySQL database password */define('DB_PASSWORD', '');/** MySQL hostname */define('DB_HOST', 'localhost');

在构造函数中连接数据库

public function __construct()    {        $this->_connectionHandle = @mysql_connect(DB_HOST, DB_USER, DB_PASSWORD, true);        if ( $this->_connectionHandle ) {        } else {                          die(print_r(mysql_error(), true));        }         mysql_select_db(DB_NAME, $this->_connectionHandle);    }

IDataServiceQuery Provider2中有5个方法，这里我们只用到两个

第一个是getResourceSet(ResourceSet $resourceSet,$filter=null,$select=null,$orderby=null,$top=null,$skip=null)，这个函数返回经过过滤器筛选的结果

public function getResourceSet(ResourceSet $resourceSet,$filter=null,$select=null,$orderby=null,$top=null,$skip=null)    {    ODataException::createNotImplementedError($this->_message);        $resourceSetName =  $resourceSet->getName();        if ($resourceSetName !== 'Contacts'         ) {            die('(SugarCRMQueryProvider) Unknown resource set ' . $resourceSetName);        }               $returnResult = array();        switch ($resourceSetName) {        case 'Contacts':            $query = "SELECT * FROM `contacts`";            if ($filter !== null) {                $query .= " AND $filter";            }            $stmt = mysql_query($query);             $returnResult = $this->_serializeContacts($stmt);                 break;                           }        mysql_free_result($stmt);        return $returnResult;    }

这里stmt为执行sql语句返回的结果，作为_serializeContacts函数的参数，_serializeContacts参数用于将结果传入一个Contacts对象中

    private function _serializeContacts($record)    {        $contacts = new Contacts();        $contacts->id = $record['id'];        $contacts->first_name = $record['first_name'];        $contacts->last_name = $record['last_name'];        $contacts->phone_mobile = $record['phone_mobile'];        $contacts->phone_fax = $record['phone_fax'];        $contacts->primary_address_street = $record['primary_address_street'];        $contacts->primary_address_city = $record['primary_address_city'];        $contacts->primary_address_county = $record['primary_address_county'];                if (!is_null($record['birthdate'])) {            $dateTime = new DateTime($record['birthdate']);            $contacts->birthdate = $dateTime->format('Y-m-d\TH:i:s');        } else {            $contacts->birthdate = null;        }        return $contacts;    }

而getResourceFromResourceSet(ResourceSet $resourceSet, KeyDescriptor $keyDescriptor)则是带有关键字的查询

 public function getResourceFromResourceSet(ResourceSet $resourceSet, KeyDescriptor $keyDescriptor)    {    ODataException::createNotImplementedError($this->_message);        $resourceSetName =  $resourceSet->getName();        if ($resourceSetName !== 'Contacts'         ) {            die('(WordPressQueryProvider) Unknown resource set ' . $resourceSetName);        }        $namedKeyValues = $keyDescriptor->getValidatedNamedValues();        $condition = null;        foreach ($namedKeyValues as $key => $value) {        $condition .= $key . ' = ' . $value[0] . ' and ';        }        $len = strlen($condition);        $condition = substr($condition, 0, $len - 5);        $query = "SELECT * FROM [$resourceSetName] WHERE $condition";        $stmt = mysql_query($query);         if (!mysql_num_rows($stmt)) {                return null;            }        $data = mysql_fetch_assoc($stmt);        switch ($resourceSetName) {        case 'Contacts':            $result = $this->_serializeContacts($data);            break;        }                mysql_free_result($stmt);        return $result;        }

其中$keyDescriptor->getValidatedNamedValues()返回关键字数组，然后用循环取得关键字及对应的值

下面改写IDataService，分别改写

public function getService($serviceType)    {    if(($serviceType === 'IDataServiceMetadataProvider') ||     ($serviceType === 'IDataServiceQueryProvider2') ||    ($serviceType === 'IDataServiceStreamProvider')) {    if (is_null($this->_SugarCRMExpressionProvider)) {$this->_SugarCRMExpressionProvider = new SugarCRMDSExpressionProvider();        }        }        if ($serviceType === 'IDataServiceMetadataProvider') {            if (is_null($this->_SugarCRMMetadata)) {                $this->_SugarCRMMetadata = CreateSugarCRMMetadata::create();                // $this->_SugarCRMMetadata->mappedDetails = CreateSugarCRMMetadata::mappingInitialize();            }            return $this->_SugarCRMMetadata;        } else if ($serviceType === 'IDataServiceQueryProvider2') {            if (is_null($this->_SugarCRMQueryProvider)) {                $this->_SugarCRMQueryProvider = new SugarCRMQueryProvider();            }            return $this->_SugarCRMQueryProvider;        } else if ($serviceType === 'IDataServiceStreamProvider') {            return new SugarCRMStreamProvider();        }        return null;    }        // For testing we overridden the DataService::handleRequest method, one thing is the    // private memeber variable DataService::_dataServiceHost is not accessible in this class,    // so we are using getHost() below.    public function handleRequest()    {    try {    $this->createProviders();    $this->getHost()->validateQueryParameters();    $requestMethod = $this->getOperationContext()->incomingRequest()->getMethod();    if ($requestMethod !== ODataConstants::HTTP_METHOD_GET) {    ODataException::createNotImplementedError(Messages::dataServiceOnlyReadSupport($requestMethod));    }    } catch (\Exception $exception) {    throw $exception;    }        $uriProcessor = null;    try {    $uriProcessor = UriProcessor::process($this);    return $uriProcessor;    } catch (\Exception $exception) {    throw $exception;    }    }

这两个函数，将metadata，queryprovider连接起来。

下一步的测试还需要跟导师沟通，下周将进行初步的测试。

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