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From the JDBC view of a database: A database server has several catalogs (such as database partitions and databases). A catalog has several schemas (these are user-specific namespaces). A schema has several database objects (tables, views, triggers, indexes, stored procedures, etc.). The java.sql.DatabaseMetaData interface has methods for discovering all the catalogs, schemas, tables, views, indexes, and stored procedures in the database server. These methods return a ResultSet, which can be traversed for getting the desired information. public static void main(String[] args) throws Exception { // Load the database driver - in this case, we // use the Jdbc/Odbc bridge driver. Connection conn = null; try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); // Open a connection to the database conn = DriverManager.getConnection( "[jdbcURL]", "[login]", "[passwd]"); // Get DatabaseMetaData DatabaseMetaData dbmd = conn.getMetaData(); // Get all Catalogs System.out.println("\nCatalogs are called '" + dbmd.getCatalogTerm() + "' in this RDBMS."); processResultSet(dbmd.getCatalogTerm(), dbmd.getCatalogs());

If it is true, then everything continues. If it s false, then the program will halt in the debugger (usually by forcing a crash). NOTE: Objective-C provides two assert methods: NSAssert and NSCAssert. NSAssert should be used only in Objective-C methods, while NSCAssert can be used only in C methods. Both can be removed from code by defining NS_BLOCK_ASSERTIONS as a preprocessor macro. The problem with using the built-in C++ assert call is that ideally you want your asserts to be active only while you re debugging. You want a way to disable all of your asserts when you go to ship your app. Asserts are invaluable in helping you track down variables that are out of bounds and other common problems, but in your shipped product, they re just taking up valuable CPU cycles, because your app should be bugfree by that point. Right

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Listing 8-2. Connection String Examples for Various Databases VB .NET, SQL Server Connection Imports System.Data.SQLClient Dim nwindConn As SqlConnection = New SqlConnection _ ("Data Source=localhost;Integrated Security=SSPI;Initial Catalog=northwind") nwindConn.Open() VB .NET, Oracle Connection Dim nwindConn As OracleConnection = _ New OracleConnection("Data Source=MyOracleServer;Integrated Security=yes;") nwindConn.Open() VB .NET, ODBC Connection Dim nwindConn As OdbcConnection = New OdbcConnection _ ("Driver={SQL Server};Server=localhost; Trusted_Connection=yes;Database=northwind") nwindConn.Open() C#, SQL Server Connection using System.Data.SQLClient; SqlConnection nwindConn = new SqlConnection("Data Source=localhost; Integrated Security=SSPI;" + "Initial Catalog=northwind"); nwindConn.Open(); C#, Oracle Connection using System.Data.OracleClient OracleConnection nwindConn = new OracleConnection("Data Source=MyOracleServer;Integrated Security=yes;"); nwindConn.Open(); C#, ODBC Connection using System.Data.Odbc OdbcConnection nwdCn = new OdbcConnection("Driver={SQL Server};Server=localhost;" + "Trusted_Connection=yes;Database=northwind"); nwdCn.Open(); Although the ODBC connections shown in Listing 8-2 access a SQL Server database, they use a format that can be used with any ODBC-compliant database.

// Get all Schemas System.out.println("\nSchemas are called '" + dbmd.getSchemaTerm() + "' in this RDBMS."); processResultSet(dbmd.getSchemaTerm(), dbmd.getSchemas()); // Get all Table-like types System.out.println("\nAll table types supported in this RDBMS:"); processResultSet("Table type", dbmd.getTableTypes()); } finally { // Close the Connection object } } public static void processResultSet(String preamble, ResultSet rs) throws SQLException { // Printout table data while(rs.next()) { // Printout System.out.println(preamble + ": " + rs.getString(1)); } // Close database resources rs.close(); }

The best way to deal with this is to create custom assert code. In this section, you ll create a custom assert macro that can be disabled via a build-time preprocessor define. First, create a header file that s going to hold the macros you re about to write. I m going to call mine MyDebug.h so that I know these are my debugging functions, but you can call it whatever you d like. Then you can include this header wherever you need it. Add the following code to the header file, and then I ll talk about what it s doing:

Wherever you see the words localhost or MyOracleServer in the connection strings in Listing 8-2, replace them with the name of your own server. All SQL Server connections are shown using Trusted_Connection=yes or Integrated Security=SSPI. Both of these will log onto the server using Windows Authentication, which means your Windows logon rather than using a username/password combination. This is a more secure way of coding so that you don t have to embed password information into your code, as long as your database administrator has created a logon for you that maps to your Windows account. Of course, in order for all of this to work, you must have the appropriate database either installed or accessible across a network. Your project s database administrator will need to create a logon and permissions for you to access the database using your Windows system account or provide a username and password.

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