albert85
Posts: 2
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| Posted: 12/26/2005, 8:49 PM |
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i have the problem of the connection java to MySQL
i oledi download the entire software:
-J2SE development kit 5.0 update6.0
-MySQL 4.1.16
-MySQL connector/j 3.1.12
is it enough for me to connect the java application to MySQL??
i oledi set the classpath like that:
my computer right click>properties >advanced >Environment Variables> System Variables>
create CLASSPATH and key in my .jar url which is:
C:\mysql-connector-java-3.1.12\mysql-connector-java-3.1.12-bin.jar
is it i inthe right path?
when i compile the source code, the error line come out:
Test.java:20: unreported exception java.lang.ClassNotFoundException; must be cau
ght or declared to be thrown
Class.forName ("JDBC_DRIVER");
^
1 error
And my source code is:::
import java.sql.Connection;
import java.sql.Statement;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
public class Test
{
static final String JDBC_DRIVER = "org.gjt.mm.mysql.driver";
static final String DATABASE_URL = "jdbc:mysql://localhost/test";
public static void main( String args[] )
{
Connection connection = null;
Statement statement = null;
try
{
Class.forName ("JDBC_DRIVER");
connection =
DriverManager.getConnection(DATABASE_URL,"root"," ");
statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(
"SELECT name,last_name FROM t");
ResultSetMetaData metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
System.out.println( " Name is:");
for ( int i=1; i <= numberOfColumns;i++)
System.out.printf( "%-8s\t",metaData.getColumnName(i));
System.out.println();
while (resultSet.next())
{
for(int i=1;i <= numberOfColumns; i++)
System.out.printf("%-8s\t",resultSet.getObject(i));
System.out.println();
}
}
catch ( SQLException sqlException )
{
sqlException.printStackTrace();
System.exit(1);
}
finally
{
try
{
statement.close();
connection.close();
}
catch (Exception exception)
{
exception.printStackTrace();
System.exit(1);
}
}
}
}
What the problem of me? can someone who can solve this problem guide me to the right path
thank you..
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matheus
Posts: 386
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| Posted: 12/27/2005, 7:56 AM |
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It's Class.forName(JDBC_DRIVER) to get the variable value, note "JDBC_DRIVER" like a string.
_________________
Matheus Trevizan
Dynamix Software Ltda.
Blumenau SC Brasil
www.dynamix.com.br |
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