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DECLARE @sql AS VARCHAR(500) = 'DECLARE @result AS INT = 42; DECLARE @ci AS VARBINARY(128) = CAST(@result AS BINARY(4)) + COALESCE(SUBSTRING(CONTEXT_INFO(), 5, 124), 0x); SET CONTEXT_INFO @ci;'; EXEC(@sql); DECLARE @myresult AS INT = CAST(SUBSTRING(CONTEXT_INFO(), 1, 4) AS INT); SELECT @myresult AS result;

Access other services, such as games and alerts. Handwrite messages to your contacts, if you re using a Tablet PC.

In SQL Server 2008 you can store a dynamic batch of code in a local variable of large object type and then invoke it as code with EXEC or sp_executesql . Such support was introduced for the first time in SQL Server 2005 . In older versions of SQL Server you couldn t define local variables longer than 8,000 bytes . This could pose a problem if you needed to construct large dynamic batches . Even though technically sp_executesql s input code string was of an NTEXT data type, you typically wanted to construct the code string in a local variable . However, you couldn t declare a local variable with a large object type, so practically

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Properties prop = new Properties(); Configures prop.put( Context.INITIAL_CONTEXT_FACTORY, WebLogic SOAP "weblogic.soap.http.SoapInitialContextFactory"); prop.put( "weblogic.soap.wsdl.interface", className ); prop.put( "weblogic.soap.verbose", "true" ); // Register encoding types CodecFactory cf = CodecFactory.newInstance(); cf.register( "http://schemas.xmlsoap.org/soap/encoding/", new SoapEncodingCodec() ); cf.register( "http://xml.apache.org/xml-soap/literalxml", new LiteralCodec() ); cf.register( "http://schemas.xmlsoap.org/soap/encoding/", new LiteralCodec() ); cf.register( "http://xml.apache.org/xml-soap/literalxml", new SoapEncodingCodec() ); prop.put( "weblogic.soap.encoding.factory", cf ); Context ctx = new InitialContext( prop ); CommonIssues webService = (CommonIssues)ctx.lookup ("http://localhost/issues/CommonIssues/CommonIssues.wsdl"); return webService; Looks up web service } catch (SoapFault fault) { System.out.println("Soap fault generated: " + fault); fault.printStackTrace(); } catch (Exception e) { System.out.println("Error in getWebService." + e.getMessage()); } return null;

speaking, query strings executed with sp_executesql were limited to the largest supported length of a Unicode character string (NVARCHAR), which was 4,000 characters . EXEC, on the other hand, supported a regular character (VARCHAR) input code string, allowing up to 8,000 characters . Furthermore, EXEC supports a special functionality that allows you to concatenate multiple variables within the parentheses, each up to the maximum supported size of 8,000 characters, like so:

DECLARE @sql1 AS VARCHAR(8000), @sql2 AS VARCHAR(8000), @sql3 AS VARCHAR(8000); SET @sql1 = <part 1>; SET @sql2 = <part 2>; SET @sql3 = <part 3>; EXEC(@sql1 + @sql2 + @sql3);

However, this technique is very awkward, and it requires some acrobatics to construct code strings longer than 8,000 characters . In SQL Server 2008, this technique is not needed because you can provide the EXEC command with a variable defined as VARCHAR(MAX) or NVARCHAR(MAX) as input . The input string can be up to 2 gigabytes (GB) in size, which is the maximum supported size for large objects in SQL Server 2008 . For example, the following code generates a large batch with more than 8,000 characters and executes it:

This code is called only once to cache the naming context in the instance of this class. It reads JNDI connection properties from a file named jndi.properties, which is found on the classpath. Tests the static variable that indicates whether an instance has already been created. If it has, then returns it. If not, creates an instance and then returns it to the caller.

DECLARE @sql AS VARCHAR(MAX) = 'PRINT ''This output was generated by' + REPLICATE(CAST('.' AS VARCHAR(MAX)), 100000) + '''' + CHAR(13) + CHAR(10) + 'PRINT ''a long batch.'''; EXEC(@sql); SELECT LEN(@sql) AS batch_length;

This code generates the following output, shown here in abbreviated form:

This output was generated by... a long batch. batch_length -------------------100059

This method is responsible for remote lookups of our bean homes It locates a named object using the specified parameter and, if such an object is found, returns a reference to it The CommonIssuesBean is responsible for receiving web service calls at Amaya and returning the latest information Important details about the ComponentLocator The getWebService method in the ComponentLocator class is the first piece of code that explicitly references WebLogic classes In chapter 4, section 431, we discussed the architecture of an RPC-style web service It involves using a stateless session bean to call a servlet that handles the SOAP communication with the web service In our implementation, WebLogic has provided an implementation of that servlet in the weblogicsoapservlet package It shields the developer from much of the detail requiring the simple calling code that is listed in our method.

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