barcode generator in vb.net code project Understand the SQL Security Model in Software

Generator Code39 in Software Understand the SQL Security Model

Understand the SQL Security Model
Decode Code 3 Of 9 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing Code 3 Of 9 In None
Using Barcode encoder for Software Control to generate, create Code 3/9 image in Software applications.
Authorization identifiers provide the foundation for your database s security. Access to all objects is permitted through these identifiers. If the authorization identifier doesn t have the appropriate privileges to access a specific object, such as a table, the data within that table is unavailable to that user. In addition, each authorization identifier can be configured with different types of privileges. For example, you can permit some authorization identifiers to view the data within a specific table, while permitting other authorization identifiers to both view and modify that data. SQL supports two types of authorization identifiers: user identifiers (or users) and role names (or roles). A user identifier is an individual security account that can represent an individual, an application, or a system service (all of which are considered database users). The SQL standard does not specify how an SQL implementation should create a user identifier. The identifier might be tied to the operating system on which the relational database management system (RDBMS) is running, or it might be explicitly created within the RDBMS environment.
Reading Code 3 Of 9 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Code 39 Full ASCII Generation In C#.NET
Using Barcode drawer for VS .NET Control to generate, create Code 39 Extended image in .NET applications.
6:
Code 39 Generator In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create ANSI/AIM Code 39 image in ASP.NET applications.
Generate Code 3 Of 9 In .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code 39 Extended image in VS .NET applications.
Managing Database Security
Code 39 Full ASCII Maker In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create Code 3 of 9 image in .NET applications.
Encode UPC A In None
Using Barcode maker for Software Control to generate, create UPC-A Supplement 2 image in Software applications.
A role name is a defined set of privileges that can be assigned to a user or to another role. If a role name is granted access to a schema object, then all user identifiers and role names that have been assigned the specified role name are granted the same access to that object whenever the role name is the current authorization identifier. For example, in Figure 6-1 the MRKT_DEPT role name has been assigned to the ACCT_DEPT role name and to four user identifiers: Ethan, Max, Linda, and Emma. If the MRKT_DEPT role name is the current authorization identifier and it has been granted access to the PERFORMERS table, the ACCT_DEPT role name and all four user identifiers have access to the PERFORMERS table. Note that, unlike a user identifier, SQL does specify how to create a role name, which I discuss in the Create and Delete Roles section later in this chapter. Role names are commonly used as a mechanism for granting a uniform set of privileges to authorization identifiers that should have the same privileges, such as people who work in the same department. They also have the distinct advantage of existence independent of user identifiers, which means they can be created prior to the user identifiers, and they persist even after the user identifiers referencing them are deleted. This is very helpful when administering privileges for a fluid workforce. In addition to user identifiers and role names, SQL supports a special built-in authorization identifier named PUBLIC, which includes everyone who uses the database. Just as with any other authorization identifier, you can grant access privileges to the PUBLIC account. For example, suppose you wanted all potential customers to be able to view your list of CDs.
UCC.EAN - 128 Creator In None
Using Barcode encoder for Software Control to generate, create GS1 128 image in Software applications.
Barcode Creation In None
Using Barcode encoder for Software Control to generate, create barcode image in Software applications.
PERFORMERS PERFORMER_ID: FULL_NAME: VARCHAR(60) INT 10001 10002 10005 10006 10008 10009 Jennifer Warnes Joni Mitchell Bing Crosby Patsy Cline Placido Domingo Luciano Pavarotti Authorization identifier (MRKT_DEPT role name) User identifier (Emma) Role name (ACCT_DEPT)
Code 128B Generation In None
Using Barcode creator for Software Control to generate, create USS Code 128 image in Software applications.
Encode EAN13 In None
Using Barcode generator for Software Control to generate, create GS1 - 13 image in Software applications.
User identifier (Linda) User identifier (Ethan) User identifier (Max)
Encode USD-4 In None
Using Barcode encoder for Software Control to generate, create ABC Codabar image in Software applications.
Code 128C Encoder In None
Using Barcode creation for Font Control to generate, create Code 128 Code Set A image in Font applications.
Figure 6-1
Bar Code Creation In None
Using Barcode generation for Font Control to generate, create bar code image in Font applications.
Draw Linear In Visual C#
Using Barcode printer for VS .NET Control to generate, create 1D image in .NET applications.
The MRKT_DEPT role assigned to four user identifiers and one role
Code 39 Full ASCII Creation In Java
Using Barcode drawer for Java Control to generate, create Code 39 Full ASCII image in Java applications.
Encode Code 39 Full ASCII In None
Using Barcode drawer for Microsoft Excel Control to generate, create Code 39 Extended image in Excel applications.
SQL: A Beginner s Guide
GS1 - 13 Drawer In None
Using Barcode generator for Microsoft Excel Control to generate, create EAN-13 image in Excel applications.
Code 128C Decoder In Visual Basic .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
You could grant the necessary privileges to the PUBLIC account for the appropriate tables and columns. Obviously, PUBLIC should be used with great care because it can open the door for people with ill intentions. In fact, many organizations ban its use completely.
SQL Sessions
Each SQL session is associated with a user identifier and role name. An SQL session is the connection between some sort of client application and the database. The session provides the context in which the authorization identifier executes SQL statements during a single connection. Throughout this connection, the SQL session maintains its association with a user identifier/role name pair. Let s take a look at Figure 6-2, which shows the user identifier/role name pair associated with a session. When a session is first established, the user identifier is always the SQL session user identifier, which is a special type of user identifier that remains associated with the session throughout the connection. It is up to the SQL implementation to determine how a specific account becomes the SQL session user identifier, although it can be an operating system user account or an account specific to the RDBMS. Whatever method is used to associate an account with the SQL session user identifier, it is this account that acts as the current user identifier. As you can also see in Figure 6-2, the role name is a null value. The role name is always null when a session is first established. In other words, whenever you log onto an SQL database and establish a session, the initial user identifier will always be the SQL session user identifier and the role name will always be a null value.
Copyright © OnBarcode.com . All rights reserved.