A database MetaData query
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
* A database MetaData query
*
* @version $Id: JDBCMeta.java,v 1.7 2004/03/09 04:27:42 ian Exp $
*/
public class JDBCMeta {
public static void main(String[] av) {
int i;
try {
// Load the driver
Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver");
// Enable logging
// DriverManager.setLogStream(System.err);
System.out.println("Getting Connection");
Connection conn = DriverManager.getConnection (
"jdbc:odbc:Companies",
"ian", ""); // user, passwd
// Get a Database MetaData as a way of interrogating
// the names of the tables in this database.
DatabaseMetaData meta = conn.getMetaData();
System.out.println("We are using " + meta.getDatabaseProductName());
System.out
.println("Version is " + meta.getDatabaseProductVersion());
int txisolation = meta.getDefaultTransactionIsolation();
System.out.println("Database default transaction isolation is "
+ txisolation + " ("
+ transactionIsolationToString(txisolation) + ").");
conn.close();
System.out.println("All done!");
} catch (ClassNotFoundException e) {
System.out.println("Can't load driver " + e);
} catch (SQLException ex) {
System.out.println("Database access failed:");
System.out.println(ex);
}
}
/**
* Convert a TransactionIsolation int (defined in java.sql.Connection) to
* the corresponding printable string.
*/
public static String transactionIsolationToString(int txisolation) {
switch (txisolation) {
case Connection.TRANSACTION_NONE:
// transactions not supported.
return "TRANSACTION_NONE";
case Connection.TRANSACTION_READ_UNCOMMITTED:
// All three phenomena can occur
return "TRANSACTION_NONE";
case Connection.TRANSACTION_READ_COMMITTED:
// Dirty reads are prevented; non-repeatable reads and
// phantom reads can occur.
return "TRANSACTION_READ_COMMITTED";
case Connection.TRANSACTION_REPEATABLE_READ:
// Dirty reads and non-repeatable reads are prevented;
// phantom reads can occur.
return "TRANSACTION_REPEATABLE_READ";
case Connection.TRANSACTION_SERIALIZABLE:
// All three phenomena prvented; slowest!
return "TRANSACTION_SERIALIZABLE";
default:
throw new IllegalArgumentException(txisolation
+ " not a valid TX_ISOLATION");
}
}
}
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