vb.net data matrix reader

vb.net data matrix reader

vb.net data matrix reader

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As we ve seen already within our application definition file, properties are used to add values to particular objects within our file. A method for a database needs two properties: RdbCommandText and RdbCommandType. RdbCommandType can have the possible values of Text, StoredProcedure, or TableDirect. RdbCommandText will have the value associated with the RdbCommandType for example, a stored procedure name, some SQL select statement, or the name of the table. You ll notice that, in our example, our SQL select statement has a number of parameters added in the where clause. These parameters need to be defined in the Parameters section, but if you want your users to have use of these parameters as filters, they also need to be described as filter descriptors.

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The BDC Data List Web Part and the entity data picker used with the Business Data column will execute whatever SQL statement or stored procedure is defined in the finder method s Properties section. This select statement could in theory return thousands of rows, which isn t generally good for users or the back-end data source or infrastructure. Allowing users to filter the data that they can view would be a better, more usable solution. To do this, a method generally needs three things for each column that you want to be able to filter: a FilterDescriptor, a Parameter, and also the SQL statement or stored procedure to make use of the parameter/filter, as shown in listing 2.8.

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An application is made up of multiple resources, each of which can be accessed with a unique URL The method used to access a resource determines the action that is to be taken on that resource

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<FilterDescriptors> <FilterDescriptor Type="Comparison" Name="ProductId" /> <FilterDescriptor Type="Wildcard" Name="Name"> <FilterDescriptor Type="Wildcard" Name="ProductNumber" /> </FilterDescriptors>

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You can see from our earlier SQL select statement that we have a FilterDescriptor defined for each part that makes up our where clause. The type of filter has a lot to do with how the user interface looks. If you choose the type to be Comparison, you re presented with the filter options in the Business Data Web Parts and the item picker control. In figure 2.2, you can see how the filters are used by the information workers. Figure 2.2 The use of the filter descriptor in a If you choose Wildcard, you re pre- Data List Web Part sented with a screen like the one shown in figure 2.3.

GET /api/items POST /api/items GET /api/items/25 PUT /api/items/15 DELETE /api/items/13

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You may think that choosing Wildcard for all string filters would make sense, but there seems to be a problem with using a wildcard filter and the general wildcard character. If you have your filter set to Contains and you enter the filter Figure 2.3 The effect of using a value to be %, you d expect it to return all the wildcard filter in your application data. This isn t the case, and you ll find that no definition file data is visible. If you do want this type of functionality, you should choose Comparison as the type of filter. With this filter for a string column, you ll find that the wildcard symbol will work as expected, with the small caveat still that % won t return all data.

Table 10-2 illustrates the typical URL routes for a REST-based service It should be clear from Table 10-2 that, under the REST model, existing HTTP verbs, such as GET (get data), POST (create data), PUT (update data), and DELETE (remove data), indicate the action to be taken on the specified resource Where required, a unique resource identifier is included with the request URL Any additional arguments, particularly when creating new resources or updating existing ones, are passed within the body of the POST or PUT request The Zend Framework includes a Zend_Rest_Route component that can automatically enable these standard REST routes for the entire application, for a specific module, or for a specific controller When matching URL requests, this component will automatically identify the request method, examine request arguments, and invoke one of the corresponding standard actions: indexAction(), getAction(), postAction(), putAction(), and deleteAction() These five standard actions are defined as abstract methods of the Zend_Rest_Controller class This controller, which itself extends the Zend_Controller_Action class, serves as the base for all REST-based controllers in the Zend Framework Here s a controller skeleton that illustrates this more clearly:

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