Ola td bem?
Eu to tentando trabalhar com base de dados em java, mas eu não consigo. Ele acha o driver jdbc
correctamente, mas qdo chega na parte da conexão com a base de dados da erro. Por favor se poder me
ajude.
O programa em java é:
import java.sql.Connection;
import java.sql.Statement;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Driver;
public class testemain{
final String JDBC_DRIVER = “com.mysql.jdbc.Driver”;
final String DATABASE_URL = “jdbc:mysql://localhost/books”;
final String pass=null;
public testemain() {
Connection connection=null;
Statement statement=null;
try{
Class.forName(JDBC_DRIVER);
connection=DriverManager.getConnection(DATABASE_URL,"mysql",pass);
statement = connection.createStatement();
ResultSet resultSet=statement.executeQuery("select * from titles");
while (resultSet.next()){
String campo= resultSet.getString("title");
System.out.println(campo);
}
statement.close();
connection.close();
}
catch (SQLException exb){
exb.printStackTrace();
System.out.println("Erro de Excecção");
System.exit(1);
}
catch (ClassNotFoundException ex) {
ex.printStackTrace();
System.out.println("Erro de Ligação");
System.exit(1);
}
}
}
O erro mandado é:
C:\Programas\Java\jdk1.5.0_04\bin\javaw -classpath “C:\Documents and Settings\Filipe\jbproject\teste\classes;C:\Programas\Java\jdk1.5.0_04\demo\jfc\CodePointIM\CodePointIM.jar;C:\Programas\Java\jdk1.5.0_04\demo\jfc\Java2D\Java2Demo.jar;C:\Programas\Java\jdk1.5.0_04\demo\plugin\jfc\CodePointIM\CodePointIM.jar;C:\Programas\Java\jdk1.5.0_04\demo\plugin\jfc\Java2D\Java2Demo.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\charsets.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\deploy.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\ext\dnsns.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\ext\localedata.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\ext\mysql-connector-java-3.0.14-production-bin.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\ext\sunjce_provider.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\ext\sunpkcs11.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\im\indicim.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\im\thaiim.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\javaws.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\jce.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\jsse.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\plugin.jar;C:\Programas\Java\jdk1.5.0_04\jre\lib\rt.jar;C:\Programas\Java\jdk1.5.0_04\lib\dt.jar;C:\Programas\Java\jdk1.5.0_04\lib\htmlconverter.jar;C:\Programas\Java\jdk1.5.0_04\lib\jconsole.jar;C:\Programas\Java\jdk1.5.0_04\lib\tools.jar;C:\Programas\Java\jdk1.5.0_04\sample\jnlp\servlet\jardiff.jar;C:\Programas\Java\jdk1.5.0_04\sample\jnlp\servlet\jnlp-servlet.jar;C:\Programas\Java\jdk1.5.0_04\sample\jnlp\servlet\jnlp.jar” -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=filipebasilio:1105,suspend=y mae
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.UnknownHostException
MESSAGE: localhost: localhost
STACKTRACE:
java.net.UnknownHostException: localhost: localhost
at java.net.InetAddress.getAllByName0(InetAddress.java:1128)
at java.net.InetAddress.getAllByName0(InetAddress.java:1098)
at java.net.InetAddress.getAllByName(InetAddress.java:1061)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:137)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2555)
at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at testemain.<init>(testemain.java:30)
at mae.main(mae.java:16)
** END NESTED EXCEPTION **
Last packet sent to the server was 47 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2621)
at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at testemain.<init>(testemain.java:30)
at mae.main(mae.java:16)
Erro de Excecção
