... 2.19 Replacing Null Values in a StronglyTypedDataSet Problem When a column in a database has a null value, you want the value in the DataSet to be a string indicating that no value is available. ... The sample code creates a stronglytypedDataSet based on the Categories table in Northwind. The user specifies whether the one based on the default or annotated schema file is used. In either ... C# code is shown in Example 2-26. Example 2-26. File: TypedDataSetNullsForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Text; using...
... The sample code creates a stronglytypedDataSet based on the Categories table in Northwind. The user specifies whether the one based on the default or annotated schema file is used. In either ... different objects in a stronglytypedDataSet and the default names and available annotations for each. Table 2-18. Default values and available annotations for elements of stronglytyped DataSet objects ... Example 2-24. File: TypedDataSetNamesForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Text; using System.Data; using System.Data.SqlClient;...
... the example form. Modifying Data Using a StronglyTypedDataSet In Chapter 10, you saw how to create and use a stronglytypedDataSet class named MyDataSet. You can use objects of ... find a completed VS .NET example project for this section in the StronglyTypedDataSet2 directory. You can open this project in VS .NET by selecting File ➣ Open ➣ Project and opening the WindowsApplication4.csproj ... from that table. In this section, you'll see how to modify data using a stronglytyped object of the MyDataSet class. Note One of the features of a stronglytypedDataSet object allows...
... value using methods such as IsContactNameNull(), and you can set a column to null using methods such as Reading a Column Value Using StronglyTypedDataSet Classes A stronglytypedDataSet ... Creating a StronglyTypedDataSet Class In this section, you'll create a stronglytypedDataSet class that is used to access the Customers table. If you're following along with these instructions, ... Northwind database. You can also follow along with the instructions in this section by copying the DataReader directory to another directory and using that project as your starting point. Creating...
... functionality in classes from which the stronglytyped classes inherit in the same way as with untyped classes. A stronglytypedDataSet class contains, in addition to a single class extending the DataSet ... Generate (DataSet dataSet, CodeNamespace codeNamespace, ICodeGenerator codeGenerator); The arguments of the method are: DataSet The DataSet used to specify the schema for the typed DataSet. codeNamespace ... the typed DataSet. codeGenerator A class capable of dynamically rendering source codein a specific language and used to create the typed DataSet. Using an XSD schema file to generate a typed...
... public String getCode( ) { return m _code; } public void setCode(String code) { m _code = code; } public String getName( ) { return m_name; } public void setName(String name) ... oracle.jdbc.driver.OracleDriver. -encoding= encoding_character_set Controls the character set encoding used when writing the class files. The default is the value in the system property file.encoding. -input= input_filename ... appropriate INSERT statement will contain one placeholder in the INSERT statement's VALUES clause: insert into person_ot values ( ? ) Here, we've formulated an INSERT statement to insert...
... unitsInStock); Console.WriteLine("discontinued = " + discontinued); } This code results in the same output as Listing 9.1. All I did in Listing 9.1 is to explicitly show that a DataReader ... Console.WriteLine("productName = " + productName); Console.WriteLine("unitPrice = " + unitPrice); Console.WriteLine("unitsInStock = " + unitsInStock); Console.WriteLine("discontinued ... productsSqlDataReader[unitPriceColPos]; object unitsInStock = productsSqlDataReader[unitsInStockColPos]; object discontinued = productsSqlDataReader[discontinuedColPos]; Console.WriteLine("productID = "...
... launching the code. Good practices include making certain that administrative accounts are kept to a minimum, that administrators use a regular account as much as possible instead of logging in ... registry key of interest. The resulting .reg file can be merged into the registry on another machine by simply double-clicking it in Windows Explorer or calling it from a .bat file. Running regedit.exe ... it has already infected a machine. It does this by looking in the download directory for WIN-BUGFIX.exe. If this file can be found, the malicious code sets a Run key to invoke WIN-BUGFIX.exe...
... containing Val favours reduction in tonic dopamine butincreases in phasic dopamine, giving rise to decreased cognitive stability butincreased cognitive flexibility. For the enzyme containing ... gene–environmentinteraction are useful in designing studies of the person-environment interactionsthat may cause continuous variation on the psychosis continuum.REFERENCESBebbington, P., Wilkins, S., ... stress in psychosisis dopamine sensitisation resulting in alterations in dopamine transmission. Thatis, prolonged or severe stress may lead to hyper-reactivity of dopamine (DA)neurons in response...
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