com.smartgwt.client.docs
Interface DataSourceDeclaration

public interface DataSourceDeclaration

Creating DataSources

DataSources can be specified in XML format, in which case the ISC server is used to load the DataSource in a JSP file, or DataSources can be directly created on the client via JavaScript.

Whether a DataSource is specified in XML or JS, identical requests will ultimately be submitted to the server, so the server integration pattern is the same. However, DataSources created in XML can be loaded and used by the Smart GWT Server, enabling many features including synchronized client-server validation, request bundling, file upload, and optional automatic SQL/Hibernate connectivity (see the Server Summary for details).

DataSources created on the client use the same style of creation as DataBound components:

    isc.DataSource.create({
        ID:"supplyItem",
        fields:[
           
 {name:"itemName", ... }
            ...
        ]
    });
 

Reference for all properties that can be set for DataSources, their fields and validators is given in the DataSource class reference.

XML DataSources use a direct analogue of this format:

     <DataSource
 ID="supplyItem">
         <fields>
             <field name="itemName" type="text"
 title="Item"/>
             <field name="SKU"      type="text" title="SKU">
                
 <validators>
                     <validator type="integerRange" ... />
                
 </validators>
             </field>
         </fields>
     </DataSource>

 

XML DataSources are loaded via a special JSP tag supported by the Smart GWT Server:

    
 <%@ taglib uri="/WEB-INF/iscTaglib.xml" prefix="isomorphic" %>
     ...
     <SCRIPT>
    
 <isomorphic:loadDS ID="supplyItem"/>
     </SCRIPT>
 

Alternatively, XML DataSources can be loaded by targeting a special servlet provided by the Smart GWT Server. This servlet yields exactly the same Javascript as the equivalent <isomorphic:loadDS/>, so the two methods are interchangeable. The servlet-based method is ideal in environments where JSP tags cannot be used (SmartGWT is one such environment). Example usage:

     <SCRIPT
 SRC=isomorphic/DataSourceLoader?dataSource=supplyItem,employees,worldDS</SCRIPT>
 

When loading an XML DataSource, by default, the ISC Server will look for a file named <dataSourceId>.ds.xml in the /shared/ds subdirectory under webroot. The location of this directory can be changed, or individual DataSources can be placed in arbitrary locations. For more information, see [webroot]/WEB-INF/classes/server.properties.