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Listing 10-10 shows a sample program that puts together all the concepts of the preceding sections. The example first registers the Oracle thin driver and connects to the database using it. The program updates some rows in a table and uses the result set to print the data. Listing 10-10. A Complete Java Program Using JDBC /* import java packages */ import java.sql.*; public class accessDatabase{ public static void main(String[] args) throws SQLException { stringfirst_name,last_name ; number salary ; connection c = null;
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CHAPTER 10 CONNECTIVITY AND NETWORKING
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/* register the Oracle Driver */ try { class.forName("oracle.jdbc.driver.OracleDriver"); c = DriverManager.getConnection( "jdbc:oracle:thin:@prod1:1521:finprod", "user", "user_passwd"); /* create the statement object */ statement s = c.createStatement(); c.setAutoCommit(false); s.executeUpdate("CREATE TABLE employees " + "(first_name VARCHAR2(30), last_name VARCHAR2(20),salary NUMBER)"); s.executeUpdate("INSERT INTO employee VALUES " + "('nicholas', 'Alapati', 50000 )"); c.commit(); c.setAutoCommit(true); /* the result set */ resultSet rs = s.executeQuery("SELECT * FROM Employees"); while( rs.next() ){ first_name = rs.getString("first_name"); last_name = rs.getString("last_name"); salary = rs.getFloat("salary"); System.out.println(first_name + last_name + " works for " + Manager + " salary is:" + salary"); } /* exception handler */ } catch (ClassNotFoundException ex){ system.out.println(ex); } catch (SQLException ex){ if ( c != null ){ c.rollback(); c.setAutoCommit(true); } system.out.println("SQLException caught"); system.out.println("---"); while (ex != null){ system.out.println("Message : " + ex.getMessage()); system.out.println("SQLState : " + ex.getSQLState()); system.out.println("ErrorCode : " + ex.getErrorCode()); system.out.println("---"); ex = ex.getNextException(); } } } } As our focus is on Oracle database administration and not on programming, I presented the simple Java program here mainly to draw your attention to aspects of Oracle database connectivity.
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CHAPTER
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User Management and Database Security
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atabase security means different things to different people. The essential thing to remember, though, is that the underlying goal of database security is to prevent unauthorized use of the database or its components. Database security depends on system and network security as well, but this chapter mostly focuses on how you can provide solid security at the database level. The first thing you ll learn in this chapter is how to create and manage users in an Oracle database. Everything users can do within an Oracle database is based on explicit privileges granted to them. You can grant users system and object privileges directly, but it s far more common to grant these privileges to roles, and to then grant roles to users, so this chapter shows you how to work with roles. You ll also learn about Oracle profiles and how to manage them. Profiles let you set limits on the resources used by each user in the database and enforce a password policy for security purposes. The Oracle Database Resource Manager enables you to allocate scarce database and server resources among groups of users according to a resource plan. This chapter provides you with an introduction to this tool. While controlling database access through the use of grants and privileges is fairly common, you must also consider using Oracle s powerful fine-grained access control feature, which lets you control access at the row level. This chapter discusses Oracle s fine-grained access control feature, also known as a virtual private database, in detail. In a production database, it s always a good idea to audit database usage. You can audit both changes made to the data and database events, such as unsuccessful attempts to log into the database. Triggers based on system events can provide your database with a strong security layer, and this chapter explains how to use these special triggers. I also show how you can use Oracle s finegrained auditing polices. Data encryption is an important tool for most organizations today. Oracle offers several ways to encrypt your data, including special PL/SQL encryption packages and a new transparent dataencryption feature that lets you encrypt a table s columns. I cover these encryption features in this chapter. In short, these are the main aspects of Oracle database security management: Controlling access to data (authorization) Restricting access to legitimate users (authentication) Ensuring accountability on part of the users (auditing) Safeguarding key data in the database (encryption) Managing the security of the entire organizational information structure (enterprise security)
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