1. C++ Builder Tutorial
2. C++ Builder Embarcadero
3. C# Builder Pattern Example
4. C Builder Pattern

. Join C Product Manager David Millington and David Intersimone as they show how to bring the unique features of CBuilder to your C development tasks.

In earlier versions of ADO.NET, compile-time checking of connection strings with concatenated string values did not occur, so that at run time, an incorrect keyword generated an ArgumentException. Each of the .NET Framework data providers supported different syntax for connection string keywords, which made constructing valid connection strings difficult if done manually. To address this problem, ADO.NET 2.0 introduced new connection string builders for each .NET Framework data provider. Each data provider includes a strongly typed connection string builder class that inherits from DbConnectionStringBuilder. The following table lists the .NET Framework data providers and their associated connection string builder classes.

CBuilder Create and test code once to deploy all the apps with this powerful C IDE. Whether you prefer a clean text editor or fast UI design, C Builder has it. Embedded SQL Database. InterBase Ultrafast, scalable, embeddable SQL database with commercial-grade data security, disaster recovery and change synchronization. C Builder is the easiest and fastest C and C IDE for building simple or professional applications on the Windows, MacOS, iOS & Android operating systems.There is a free C Builder Community Edition for students, beginners and startups; it can be downloaded from here. This builder class provides an interface for constructing foo objects, allowing various combinations of parameters to be provided. This avoids having to define a large collection of constructors for foo. The foo::builder class implements a set of chainable functions for setting the construction parameters ( lines 21–24) and a build member. Access to dozens of professional and creative resume templates. Editing tools you can use directly on our platform. Ability to download and print resumes instantly. Downloads available in PDF, Word, RTF, and plain text formatting. Unlimited sharing over email and social media. 24/7/365 access to your resume through your resume.com account.

Connection String Injection Attacks

A connection string injection attack can occur when dynamic string concatenation is used to build connection strings that are based on user input. If the string is not validated and malicious text or characters not escaped, an attacker can potentially access sensitive data or other resources on the server. For example, an attacker could mount an attack by supplying a semicolon and appending an additional value. The connection string is parsed by using a 'last one wins' algorithm, and the hostile input is substituted for a legitimate value.

The connection string builder classes are designed to eliminate guesswork and protect against syntax errors and security vulnerabilities. They provide methods and properties corresponding to the known key/value pairs permitted by each data provider. Each class maintains a fixed collection of synonyms and can translate from a synonym to the corresponding well-known key name. Checks are performed for valid key/value pairs and an invalid pair throws an exception. In addition, injected values are handled in a safe manner.

The following example demonstrates how the SqlConnectionStringBuilder handles an inserted extra value for the Initial Catalog setting.

The output shows that the SqlConnectionStringBuilder handled this correctly by escaping the extra value in double quotation marks instead of appending it to the connection string as a new key/value pair.

C++ Builder Tutorial

Building Connection Strings from Configuration Files

C++ Builder Embarcadero

If certain elements of a connection string are known beforehand, they can be stored in a configuration file and retrieved at run time to construct a complete connection string. For example, the name of the database might be known in advance, but not the name of the server. Or you might want a user to supply a name and password at run time without being able to inject other values into the connection string.

One of the overloaded constructors for a connection string builder takes a String as an argument, which enables you to supply a partial connection string that can then be completed from user input. The partial connection string can be stored in a configuration file and retrieved at run time.

Note

The System.Configuration namespace allows programmatic access to configuration files that use the WebConfigurationManager for Web applications and the ConfigurationManager for Windows applications. For more information about working with connection strings and configuration files, see Connection Strings and Configuration Files.

Example

This example demonstrates retrieving a partial connection string from a configuration file and completing it by setting the DataSource, UserID, and Password properties of the SqlConnectionStringBuilder. The configuration file is defined as follows.

C# Builder Pattern Example

Note

You must set a reference to the System.Configuration.dll in your project for the code to run.

C Builder Pattern

See also