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JDBC Driver Does Not Exist

I’m trying to connect a Java program to a remote Oracle DB. After doing some research online, I decided that the easiest way to do this was with the Oracle JDBC driver. I downloaded and ran the jar file and got the message “***** JCE UNLIMITED STRENGTH IS INSTALLED *****.” The problem is that when I try to add the driver to my classpath (javac -classpath ojdbc8.jar Connect.java), I keep getting an error message saying “package oracle.jdbc.driver does not exist.” I’ve been researching how to fix this online, but I’m only getting confused. Any ideas on what I did wrong?
import java.sql.*;
public class Class1 {
public static void main (String args [])
throws SQLException
{
// Load the Oracle JDBC driver
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
// Connect to the database
// You must put a database name after the # sign in the connection URL.
// You can use either the fully specified SQL*net syntax or a short cut
// syntax as `<host>`:`<port>`:`<sid>`. The example uses the short cut syntax.
Connection conn =
DriverManager.getConnection ("jdbc:oracle:thin:hr/hr#myhostname:1521:orcl",
"myUsername", "myPassword");
// Create a Statement
Statement stmt = conn.createStatement ();
// Select the ENAME column from the EMP table
ResultSet rset = stmt.executeQuery ("select ENAME from EMP");
// Iterate through the result and print the employee names
while (rset.next ())
System.out.println (rset.getString (1));
conn.close(); // ** IMPORTANT : Close connections when done **
}
}
The error is:
java: package oracle.jdbc.driver does not exist

Can you try to run the sample DataSourceSample.java? Make sure you have the JDBC driver in the classpath. You can also refer to this quickstart for detailed instructions.

When I run SQL query from RIDE it gives error

I am having this problem,
When I send an SQL query as an argument it gives error
when I use the same query directly in my java program it works fine.
MY SQL query when I send as an argument is as follow
Select RATINGPERIOD from INVESTMENT.I1INVE Where INVESTMENTID = 100
rs = stmt.executeQuery(sqlQery); // Select RATINGPERIOD from INVESTMENT.I1INVE Where INVESTMENTID = 100
and when I use it directly into my java program is as follow
try
{
// Load the driver
Class.forName("com.ibm.db2.jcc.DB2Driver");
System.out.println("**** Loaded the JDBC driver");
// Create the connection using the IBM Data Server Driver for JDBC and SQLJ
con = DriverManager.getConnection (url, user, password);
// Create the Statement
stmt = con.createStatement();
System.out.println("**** Created JDBC Statement object");
// Execute a query and generate a ResultSet instance
rs = stmt.executeQuery("Select RATINGPERIOD from INVESTMENT.I1INVE where INVESTMENTID = 100");
while (rs.next()) {
delay = rs.getString("RATINGPERIOD");
System.out.println("size of list ="+delay);
}
}
Error log
com.ibm.db2.jcc.am.SqlException: [jcc][10103][10941][3.62.57] Method executeQuery cannot be used for update. ERRORCODE=-4476, SQLSTATE=null
at com.ibm.db2.jcc.am.fd.a(fd.java:660)
at com.ibm.db2.jcc.am.fd.a(fd.java:60)
at com.ibm.db2.jcc.am.fd.a(fd.java:120)
at com.ibm.db2.jcc.am.jn.a(jn.java:4129)
at com.ibm.db2.jcc.am.jn.a(jn.java:2875)
at com.ibm.db2.jcc.am.jn.a(jn.java:679)
at com.ibm.db2.jcc.am.jn.executeQuery(jn.java:663)
at com.profitsoftware.testing.utils.keywords.date.DatabaseSQL.sqlQuery(DatabaseSQL.java:46)
at com.profitsoftware.testing.utils.keywords.date.DatabaseSQLKeywords.executeSqlQuery(DatabaseSQLKeywords.java:18)com.
ok some more information, I have assigned sql query to a string in Java program and then compared it to the query(String) I was getting as argument in my java program and it gives false. which explain maybe when query is passed from RIDE to Java programm it changes somehow. any idea what happens there ?
Thanks in advance and sorry if it sounds a stupid question, I a new to this programming world.
oK, It started to work, actually I was missing something there, so type. My logic itself was good but it was typo that created the problem
--Sara

Can you use JDBC to connect to just an instance without specifying a database?

I am working on an JAVA app that evaluates the data and log sizes of all databases on an instance and mails a monthly report. I am currently working with SQLServer2014. I am using an SQL query that calculates the size of all databases by querying sys.master_files.
The problem is that when using JDBC to make the query, it returns the error:
java.sql.SQLException: No suitable driver found for jdbc:microsoft:sqlserver://localhost"
I have tried connecting to particular databases and that works fine. Is there any way to do this query directly to sys.master_files using JDBC? Or is there a smarter way altogether to accomplish the same result?
Thanks

Your "No suitable driver found" error is simply due to a malformed connection URL. jdbc:microsoft:sqlserver is not valid.
As for connecting to an instance without specifying a particular database, this works fine for me:
// NB: no databaseName specified in the following
String connectionUrl = "jdbc:sqlserver://localhost;instanceName=SQLEXPRESS;integratedSecurity=true";
try (Connection conn = DriverManager.getConnection(connectionUrl)) {
String sql = "SELECT name FROM sys.master_files WHERE type_desc='ROWS' ORDER BY database_id";
try (
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql)) {
while (rs.next()) {
System.out.println(rs.getString(1));
}
}
} catch (Exception e) {
e.printStackTrace(System.err);
}
Note that sys.master_files is a system view that is available in all databases, so AFAIK it doesn't matter what the current database (catalog) is when you call it.

No suitable driver found when making SQL connection to MS Access Database in java

I have a Jbutton (GetDataFromDB) in a simple java application that is suppose to load the data from the database depicted in the path in the code below into a Jtable in the application.
Edited answer into code:
private void GetDataFromDBActionPerformed(java.awt.event.ActionEvent evt) {
Connection con;
ResultSet rs = null;
Statement stmt;
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:Driver={MS Access Driver (*.mdb, *.accdb)};Dbq=C:\\Users\\Bruger\\Documents\\Database11.accdb");
stmt = con.createStatement();
String query = null;
query = "select * from cost";
rs = stmt.executeQuery(query);
i = 0;
while (rs.next()){
i = i + 1;
jTable.getModel().setValueAt(rs.getString(1), i, 1);
jTable.getModel().setValueAt(rs.getString(2), i, 2);
}
rs.close();
stmt.close();
con.close();
} catch(Exception err){
System.out.println(err.getMessage());
}
}
When I press the button I get the following message in the run output window:
No suitable driver found for jdbc:odbc:Driver={Microsoft Access Driver (.mdb, .accdb)};Dbq=C:\Users\Bruger\Documents\Database11.accdb
I have at the top of my code the import:
import java.sql.*;
I have also tried changing from "Microsoft Access Driver" to "MS Access Driver" but I get the same message in the run output window i.e.
No suitable driver found for jdbc:odbc:Driver={MS Access Driver (.mdb, .accdb)};Dbq=C:\Users\Bruger\Documents\Database11.accdb
I'm really thankful for all your help, input and feedback.

Depending on the driver and If you are pre JDK 6**!
You need to register the driver.
Try adding:
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
So:
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)};Dbq=C:\\Users\\Bruger\\Documents\\Database11.accdb");
It's also worth mentioning you don't need to do this every time you get a connection, just once to make sure the class is loaded.
There are a lot of stackoverflow questions relating to this, but the reason for it is below:
Source - From The Java Tutorial:
In previous versions of JDBC, to obtain a connection, you first had to
initialize your JDBC driver by calling the method Class.forName. This
methods required an object of type java.sql.Driver. Each JDBC driver
contains one or more classes that implements the interface
java.sql.Driver. ... Any JDBC 4.0 drivers that are found in your class
path are automatically loaded. (However, you must manually load any
drivers prior to JDBC 4.0 with the method Class.forName.)
On a related and very important note.
I would also recommend looking up how to handle connections. External Resources like database connections and cursors are easy to leak if you are not familiar with them. Look up 'try finally blocks', or more recently in java 7+ 'try-with-resources'.

SQLException: Unsupported feature

I am trying to get Generated key from sequnce.(Using Servlets & Oracle10)
Following is my code:
query ="insert into TABLE_NAME(COL1,COL2,COL3) values(sysdate,?,SEQ_NAME.nextval)";
PreparedStatement pstmt = con.prepareStatement(query,new String[]{"COL3"}); //Getting error on this line
pstmt.setString(1,Str2);
pstmt.executeUpdate();
ResultSet keyset = pstmt.getGeneratedKeys();
if(keyset.next())
{
genKey = keyset.getString(1);
}
But I am getting the Exception:
java.sql.SQLException: Unsupported feature
Few days ago this code was working fine. So what might be the reason that this code is not working now? (I haven't changed the JDBC driver war file)
Thanks in advance.
Is there another way of getting the value generated by sequence in the query?

Download the latest JDBC drivers, I think you need at least the 10.2.0.1 drivers and the db also need to be 10.2+
http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/htdocs/jdbc101040.html
or first get the sequence value
String sqlForSeq = "select SEQ_NAME.NEXTVAL from dual";
ResultSet rs = stmt.executeQuery(sqlForSeq);
if (rs.next()) {
logSeq = rs.getString("NEXTVAL");
}