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If Request.Files(0).FileName.Length > 0 Then ... The Request.Files property contains the list of uploaded files. You can t just use its Count property because of the way the HTML File Field control works: there will always be an item in this collection for each of these controls on a page, and you can know if an actual file was submitted only by checking for the FileName property of each element in this collection. As you know, there will be only one element, so you directly check that against the first element in the collection. The Files collection itself contains a single HttpPostedFile object (Request.Files(0)) that represents the uploaded file, and it contains a number of useful subproperties that describe the file being uploaded (ContentLength, ContentType, and FileName, for example). Next, you see one of the reader implementations of the System.IO namespace in action, the StreamReader: Dim stm As New StreamReader(Request.Files(0).InputStream) Its constructor requires an object of type Stream, which you get from the InputStream property of the posted file. This Stream contains the uploaded content. The Imports construct ensures this reader will be properly disposed of as soon as you leave the block. You put of all the file content returned by the reader into a Session item called xml. You also hold the original file name in a second Session variable, called file: Session("xml") = stm.ReadToEnd() Session("file") = Request.Files(0).FileName The ReadToEnd() method returns the whole file the XML document as a single string.

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Besides specifying the font, color, and pattern to use when rendering the chart value using the <valueDisplay> tag options, this plot also allows suppressing the lines on the thermometer or changing the color of the liquid.

Note It is an interesting point that the optimizer can use the density from user_tab_columns instead of 1/num_distinct when applying filter predicates but doesn t seem to do so when applying join predicates (at least not directly; it is possible that the join selectivity is derived from the density in some way that I haven t yet worked out).

It s a difficult problem to address essentially it comes down to knowing your data, recognizing the few critical cases, and tailoring a specific mechanism to each of them.

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The XmlValidatingReader class that you will use derives from XmlReader, so it shares many properties and methods with that class. It also adds a set of new properties (that is, it extends the base class) to set options required for validation. In this book, we ll use the term validator to refer to an instance of this class. Once the validator is configured, you can start reading an XML file and taking values from it, just as you would with a regular XmlReader object. Behind the scenes, though, the object ensures that the file is valid as it is read, according to the settings you have made and to the schema you have configured. You can configure the validator to react when validation errors are found in the XML source in two ways: The validator can throw exceptions. This is the default mode. When an error is found, processing is aborted and an XmlSchemaException is thrown. The validator can fire the event handler attached to the ValidationEventHandler event of the XmlValidatingReader class. When a handler is specified for this event, the validator won t throw an exception when an error appears; instead, it will call the handler. It is up to the developer to collect information inside the handler and respond accordingly. Clearly, the second approach allows more complete reporting of any failures found in an XML file, and it also allows you to continue through the document and process all elements, whenever it makes sense.

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It doesn t matter how much you know, there are always new examples that need further investigation. What happens if your query includes an extra predicate against the join columns, such as the following example

Try It Out: Set Up Validation You re now ready to handle the second step for receiving the uploaded file: setting up the reader. You ll write the code to set up the XmlValidatingReader object. 1. Declare the following private member at class level, before the Page_Load() event handler: Dim _errors As New StringBuilder

This plot is for Multi-axis charts. It groups all the common plot options shared by the charts inside the Multi-axis chart. The JRXML syntax for this type of plot is given in Listing 13-26. Listing 13-26. JRXML Syntax <!ELEMENT multiAxisPlot (plot, axis+)> <!ELEMENT axis (barChart | bar3DChart | xyBarChart | stackedBarChart | stackedBar3DChart| lineChart | xyLineChart | areaChart | xyAreaChart | scatterChart | bubbleChart | timeSeriesChart | highLowChart | candlestickChart | stackedAreaChart)> <!ATTLIST axis position (leftOrTop | rightOrBottom) "leftOrTop" > The nested charts are specified via the <axis> tags. All nested charts must share the same type of domain axis: category, numeric (XY), or time based.

select t1.v1, t2.v1 from t1, t2 where and and ; t1.join1 = 20 t2.join1 = t1.join1 t2.join2 = t1.join2 -- 30 distinct values -- 40 / 30 distinct values -- 40 / 50 distinct values

Note As a naming convention, we prefix class-level variables with an underscore so that we can easily

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