Develop Reference

Connection between a Java application and a database on Cloudera

as the title, I have a problem with the connection between a Java application and the database created on a virtual machine Cloudera.
A sample project application, which I placed, contains files with the extension .jar needed to connect.
Virtual machine network card is set to Host-Only.
Ip this virtual machine: 192.168.56.1.
I have no idea what to do next in order to be able to perform queries to the database.
Please help and sorry for my English.
Java Code:
package p;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
import java.util.Scanner;
public class p{
static Connection connection = null;
static Statement statement = null;
public static void main(String[] args) throws SQLException, ClassNotFoundException {
Class.forName("com.cloudera.hive.jdbc4.HS2Driver");
connection = DriverManager.getConnection("jdbc:hive2://192.168.56.1:10000/przychodnia", "cloudera", "cloudera");
statement = connection.createStatement();
System.out.println("Wybierz");
System.out.println("0 aby dodać do istniejącej tabeli wiersz");
System.out.println("1 aby usunąć z istniejącej tabeli wiersz");
String SQL = "SELECT * FROM pacjenci";
ResultSet rs = statement.executeQuery(SQL);
while (rs.next()){
String imie = rs.getString("imie");
String p = imie;
System.out.println(p);
}
}
}
Warnings:
log4j:WARN No appenders could be found for logger (org.apache.thrift.transport.TSaslTransport).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.sql.SQLException: [Simba][HiveJDBCDriver](500310) Invalid operation: java.net.ConnectException: Connection refused: connect;
at com.cloudera.hive.hivecommon.api.HiveServer2ClientFactory.createTransport(HiveServer2ClientFactory.java:224)
at com.cloudera.hive.hive.api.ExtendedHS2Factory.createClient(ExtendedHS2Factory.java:38)
at com.cloudera.hive.hivecommon.core.HiveJDBCConnection.connect(HiveJDBCConnection.java:597)
at com.cloudera.hive.jdbc.common.BaseConnectionFactory.doConnect(BaseConnectionFactory.java:219)
at com.cloudera.hive.jdbc.common.AbstractDriver.connect(AbstractDriver.java:216)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
Caused by: com.cloudera.hive.support.exceptions.GeneralException: [Simba][HiveJDBCDriver](500310) Invalid operation: java.net.ConnectException: Connection refused: connect;
... 7 more
Caused by: org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused: connect
at org.apache.thrift.transport.TSocket.open(TSocket.java:185)
at org.apache.thrift.transport.TSaslTransport.open(TSaslTransport.java:248)
at org.apache.thrift.transport.TSaslClientTransport.open(TSaslClientTransport.java:37)
at com.cloudera.hive.hivecommon.api.HiveServer2ClientFactory.createTransport(HiveServer2ClientFactory.java:210)
at com.cloudera.hive.hive.api.ExtendedHS2Factory.createClient(ExtendedHS2Factory.java:38)
at com.cloudera.hive.hivecommon.core.HiveJDBCConnection.connect(HiveJDBCConnection.java:597)
at com.cloudera.hive.jdbc.common.BaseConnectionFactory.doConnect(BaseConnectionFactory.java:219)
at com.cloudera.hive.jdbc.common.AbstractDriver.connect(AbstractDriver.java:216)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at p.p.main(p.java:15)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at org.apache.thrift.transport.TSocket.open(TSocket.java:180)
... 10 more

Ip this virtual machine: 192.168.56.1.
Your image that says "Column name not found" is using IP 192.168.56.101

Error in connecting to AS400 DB2 server JDBC

I am trying to connect to the AS400 DB2 database using the JDBC in a java program but I am unable to connect as it is giving a SQLException stating No suitable driver found for ​jdbc:as400://192.168.1.11
Whereas I added No suitable driver found for ​jdbc:as400://192.168.1.11
I added the following libraries to my project: db2jcc_licence_cu.jar, db2jcc4.jar, jt400-6.4.jar.
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
public class ReadAllTables {
public static void main(String args[]) throws Exception {
//Class.forName ("com.ibm.as400.access.AS400JDBCDriver");
DriverManager.registerDriver(new com.ibm.as400.access.AS400JDBCDriver());
// Enable logging
// DriverManager.setLogStream(System.err);
System.out.println("Getting Connection");
Connection c = DriverManager.getConnection ("​jdbc:as400://ipaddress","username","password");
DatabaseMetaData md = c.getMetaData();
ResultSet rs = md.getTables(null, null, "%", null);
while (rs.next()) {
System.out.println(rs.getString(3));
}
}
}
This is what the error I am getting:
Getting Connection
Exception in thread "main" java.sql.SQLException: No suitable driver found for ​jdbc:as400://192.168.1.11
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.test.ReadAllTables.main(ReadAllTables.java:18)
Thanks in advance

You must have jt400.jar in your classpath for the AS/400 JDBC driver to work.
Version 7.10 is in Maven or download the latest from https://sourceforge.net/projects/jt400/ or copy it from IFS. The native CC driver is only used when running locally on the AS/400.
Given your current list of jars it sounds like your CLASSPATH variable is incorrect (or if you use a runnable jar, your Class-Path line in the manifest file is wrong). If you launch with RUNJVA the mechanism is different.

ORA-12505, TNS:listener does not currently know of SID

I'm new to java oracle database coding and I'm getting this error when running the code below (eclipse kepler):
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class main {
public static void main(String[] args) {
try {
Class.forName("oracle.jdbc.OracleDriver");
} catch (ClassNotFoundException e) {
e.printStackTrace();
return;
}
Connection connection = null;
try {
connection = DriverManager.getConnection(
"jdbc:oracle:thin:#10.0.32.166:1521:orcl", "username", "password");
} catch (SQLException e) {
e.printStackTrace();
return;
}
}
}
Error is for ojdbc14.jar:
java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:113)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:263)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:389)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:454)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:802)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at oracle.main.main(main.java:18)
While I tried to change ojdbc6.jar but a different error shows up:
java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:199)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:480)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:413)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:508)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:203)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:33)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:510)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at oracle.main.main(main.java:18)
Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:361)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:966)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:292)
... 7 more
Reason I'm experimenting on the 2 jar is I'm not sure which is compatible to jdk 1.6 as this is were I'm gonna deploy (linux env) the executable jar once completed. Need help to identify what these errors are and ideas to fix them? thank you

You do not have a database "called" orcl on the database server 10.0.32.166 with an oracle listener running on port 1521.
Do lsnrctl statusfrom the console on server 10.0.32.166 and see if you have a line like Service "ORCL" has X instance(s). If you don't have that make sure the database is up and you have the correct SID and it is using the listener on port 1521.

Unable to connect to Oracle 11g using jdbc

I'm trying to connect to Oracle 11g using jdbc as below but its giving me error. I had downloaded and kept jars in eclipse (ojdbc6dms.jar and ojdbc6dms_g.jar), but still its giving error
public static Connection getDatabaseConnection() throws SQLException,
InstantiationException, IllegalAccessException,
ClassNotFoundException {
Connection con = null;
// initialising drive
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
// load driver
con = DriverManager.getConnection(
"jdbc:oracle:thin:#10.16.52.79:1521:TST", "rep",
"Appe");
String dbName = con.getMetaData().getDatabaseProductName();
System.out.println(" Conected to DB " + dbName);
return con;
} // insertRecordsToDB
Exception in thread "main" java.lang.NoClassDefFoundError: oracle/dms/console/DMSConsole
at oracle.jdbc.driver.DMSFactory.<clinit>(DMSFactory.java:45)
at oracle.jdbc.driver.PhysicalConnection.createDMSSensors(PhysicalConnection.java:4203)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:629)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:218)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:29)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:538)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at
Just wondering in which jar has class oracle/dms/console/DMSConsole . Because when i checked those jars, this class is not available

The JDBC driver download page for Oracle 11g has the file ojdbc6dms.jar which contains oracle.jdbc.driver.DMSFactory.
EDIT: As per #JavaGeek's comment below, this jar does not actually contain the DMSConsole class. The required class is available in the Oracle Server installation, in the location $ORACLE_HOME/oc4j/lib/dms.jar. Server downloads are also available at Oracle TechNetwork

MySQL jdbc driver and Eclipse problems

I am having problems loading the MySQL JDBC driver. I have tried everything mentioned here, but am still running into problems.
The error I get is this:
Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at Main.main(Main.java:12)
My code is as follows:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Main {
public static void main(String args[]) throws Exception {
//accessing the driver
Class.forName("com.mysql.jdbc.driver");
// creating variable to pass the connection information into
Connection dbcon = DriverManager.getConnection(
"jdbc:mysql//localhost:3306/test", "root", "root");
PreparedStatement statement = dbcon
.prepareStatement("select * from names");
ResultSet result = statement.executeQuery();
while (result.next()) {
System.out.println(result.getString(2));
}
}
}
As you can see above I have placed the driver in the lib folder and I have also put it into the Apache tomcat lib folder, because that was suggested as well.
Thank you for any help you can give me.
Andrew

The class name inside the MySql connectorJ JAR file is Driver. so you need to change
Class.forName("com.mysql.jdbc.driver");
to
Class.forName("com.mysql.jdbc.Driver");

It tells you the problem on the first line of your stacktrace:
Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.driver
The driver name is com.mysql.jdbc.Driver (capital D).

problem in loading the mysql connection library.please check the proper mysql library is load successfully.because when library load successfully then the library package display all the external loaded library.