barcode generator project source code in vb.net SQL Demysti ed in Software

Printing PDF-417 2d barcode in Software SQL Demysti ed

SQL Demysti ed
Reading PDF-417 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
PDF 417 Generator In None
Using Barcode generation for Software Control to generate, create PDF 417 image in Software applications.
SQL Statements Used for Security Administration
Decode PDF-417 2d Barcode In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Create PDF417 In C#.NET
Using Barcode creator for .NET Control to generate, create PDF 417 image in VS .NET applications.
This topic describes the SQL statements used to administer data access security. Keep in mind that there is a lot of variation in the way that security is implemented in different SQL implementations, so as always, you should consult the documentation supplied by your database vendor.
Encode PDF417 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
PDF 417 Generation In .NET Framework
Using Barcode creation for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in .NET applications.
The CREATE USER Statement
Generate PDF417 In VB.NET
Using Barcode maker for .NET framework Control to generate, create PDF417 image in Visual Studio .NET applications.
USS-128 Encoder In None
Using Barcode creator for Software Control to generate, create UCC - 12 image in Software applications.
Many database vendors provide a GUI (graphical user interface) for security administration. However, the SQL standard contains a CREATE USER statement that can be used to de ne users in the database. The general syntax of the CREATE USER statement is
Code 128B Encoder In None
Using Barcode generation for Software Control to generate, create Code128 image in Software applications.
Barcode Maker In None
Using Barcode encoder for Software Control to generate, create bar code image in Software applications.
CREATE USER username [IDENTIFIED BY password] [options];
Making Code39 In None
Using Barcode printer for Software Control to generate, create Code 39 Extended image in Software applications.
Generating Barcode In None
Using Barcode drawer for Software Control to generate, create barcode image in Software applications.
N OTE : The IDENTIFIED BY CLAUSE is used for users that are authenticated by the DBMS. For users authenticated externally (that is, by the operating system), the syntax will vary. The options (if any apply) are DBMS speci c and may include such things as defaults for various database connection properties. Microsoft SQL Server and Sybase Adaptive Server do not support the CREATE USER statement. Instead, they use stored procedures supplied by the database vendor: sp_addlogin is used to add logins to the SQL Server, which gives users the ability to connect to the SQL Server, and sp_adduser is used to add users to a database, which associates a login with a user account to permit access to the particular database.
International Standard Serial Number Creator In None
Using Barcode generation for Software Control to generate, create ISSN - 13 image in Software applications.
Drawing EAN13 In C#.NET
Using Barcode creator for .NET Control to generate, create EAN 13 image in Visual Studio .NET applications.
The GRANT Statement
USS Code 39 Printer In Objective-C
Using Barcode creation for iPad Control to generate, create ANSI/AIM Code 39 image in iPad applications.
Data Matrix ECC200 Generator In Java
Using Barcode drawer for Java Control to generate, create DataMatrix image in Java applications.
The GRANT statement is used to bestow one or more privileges to a database user. The general syntax of the GRANT statement is
EAN / UCC - 13 Creation In Objective-C
Using Barcode creation for iPad Control to generate, create EAN13 image in iPad applications.
Create GTIN - 12 In Objective-C
Using Barcode maker for iPad Control to generate, create UPC A image in iPad applications.
GRANT privilege [,privilege ...] [ON object] TO grantee [,grantee ...] [WITH GRANT OPTION | WITH ADMIN OPTION];
Bar Code Generator In Objective-C
Using Barcode generation for iPhone Control to generate, create barcode image in iPhone applications.
Bar Code Scanner In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Applying Security Controls Using DCL
N OTE : The privilege list can be either one or more system privileges, or one or more object privileges. System and object privileges cannot be mixed in the same GRANT statement. The ON object clause applies only to object privileges. It speci es the object on which object privileges listed in the privilege list are being granted. The grantee list speci es one or more database users or roles that are to receive the privilege(s). Roles are discussed later in this chapter. The WITH GRANT OPTION or WITH ADMIN OPTION clause allows the grantee to then grant the privilege to others. The syntax and usage will vary some across different SQL implementations. As already mentioned, I don t recommend using these because they essentially give away control of database privileges. One example follows. You will nd more examples in the Simplifying Administration Using Roles section toward the end of this chapter. Grant the SELECT privilege on the MPAA_RATING table to PUBLIC. In most SQL implementations, PUBLIC is a keyword that is used to assign a privilege to all users of the database. In general, this is not a great idea, but the MPAA_RATING is just a code reference table, so allowing everyone to select from it is not much of a security exposure.
GRANT SELECT ON MPAA_RATING TO PUBLIC;
The REVOKE Statement
The general syntax of the REVOKE statement is shown here, along with some examples:
REVOKE privilege [,privilege ...] [ON object] FROM grantee [,grantee ...];
N OTE : The privilege list can be either one or more system privileges, or one or more object privileges. System and object privileges cannot be mixed in the same REVOKE statement.
SQL Demysti ed
The ON object clause applies only to object privileges. It speci es the object for which object privileges listed in the privilege list are being revoked. The grantee list speci es one or more database users or roles that are to lose the privilege(s). Roles are discussed later in this chapter. Here is an example it reverses the GRANT from the previous topic:
REVOKE SELECT ON MPAA_RATING FROM PUBLIC;
Copyright © OnBarcode.com . All rights reserved.