I'm trying to compile this small piece of code, to help me connect to my db and retrieve some information to test it. I am using Netbeans on a Windows 7 x64 machine. This is the code:
package passwordprotector;
import java.sql.*;
public class PasswordProtector {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
String host = "jdbc:derby://localhost:1527/PasswordProtector DB";
String dbUsername = "john";
String dbPassword = "arsenal";
/*try{
Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
}catch(ClassNotFoundException e){
System.out.println(e);
}*/
try{
Connection con = DriverManager.getConnection(host, dbUsername, dbPassword);
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM APP.PERSON");
while (rs.next()) {
String uName = rs.getString("uname");
String uPass = rs.getString("upass");
System.out.println("Username: " + uName + "/n" + "Password: " + uPass);
}
}catch(SQLException e){
System.err.println(e);
}
}
}
When I compile and run I receive this error:
java.sql.SQLException: No suitable driver found for jdbc:derby://localhost:1527/PasswordProtector DB
BUILD SUCCESSFUL (total time: 0 seconds)
When I right click on my db and select properties I can see it's location, like so:
Database URL: jdbc:derby://localhost:1527/PasswordProtector
I've checked with others who have posted about this and it seems they had an incorrect URL as the issue, but I can't see any other URL which I can use apart from the one posted.
I've tried with and without the ending ' DB' for the String host, neither works.
I've also already read from here and still couldn't figure out why the URl is incorrect:
Not sure the problem with the database URL connection, but in the usage of the correct driver. If the database is embedded you should use the driver commented in your post and example from my answer, there's also tutorial embedded derby.
if not then use
Class.forName("org.apache.derby.jdbc.ClientDriver");
It's a different driver to connect to the database running standalone. In this case see derby network client documentation how to configure and run derby network client.
Make sure derbyrun.jar is in your classpath. It resides in the db/lib directory of your JDK.
Doing a quick search on Maven and Derby, included the following in my pom:
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>10.10.2.0</version>
</dependency>
and everything worked afterwards, so it may be a library reference issue if the previous solution did not work.
Related
This question already has answers here:
Connect Java to a MySQL database
(14 answers)
Closed 1 year ago.
I am currently making a backend reporting system (for a voting system assignment) using Java on VS Code, I am connecting to a MySQL database using the JDBC library in order to do calculations and stats and so on. So what happens is that once I create a project file and include the mysql-connector-java-8.0.25.jar in the referenced libraries, I can connect to the DB and retrieve data from the tables just fine, but after a few executions I no longer get output and it shows me the error "java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver".
Can anyone tell me why this is happening and how to fix this? There are no changes that I know of taking place in the Environment Variables (at least from what I can see in Windows path list) unless something is being overwritten somewhere or that it's a bug of some sort. Any advice would be greatly helpful, I've been unable to figure this out all day
This is what my ReportSystem.java looks like...
import java.sql.*;
public class ReportSystem
{
public static void main(String[] args)
{
//Test driver connection/registration
try
{
Class.forName("com.mysql.cj.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ElectionDB","<username>","<password>");
Statement stmt = conn.createStatement();
ResultSet result = stmt.executeQuery("SELECT * FROM ElectionDB.Votes");
int typeColumn = 1;
int districtColumn = 2;
//Output results line by line
while(result.next())
{
System.out.println(result.getString(typeColumn));
System.out.println(result.getString(districtColumn));
}
//Remember to close the connection
conn.close();
}
catch (Exception e)
{
System.out.println(e);
}
}
}
My file structure as in the directory is as follows:
ReportSystem
>src > ReportSystem.java
> ReportSystem.class
>lib
>.vscode > settings.json
The JRE system library used is: [jdk-16.0.1]
The Referenced Libraries contains: [mysql-connector-java-8.0.25.jar]
Screenshot for context Project Setup in VS Code
I'm able to get result after running code 20 times continuously by clicking the run button. The only difference is the JDBC connection string, which is copied directly by right clicking the MYSQL connection:
So in my project, the connection string is like:
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/?user=username","<username>","<password>");
OR
You could try
String url="jdbc:mysql://localhost:3306/ElectionDB?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC"
For your reference, OS Infomation:
MySQL: 8.0 // mysql-connector-java-8.0.25.jar
VSCode: 1.56.2 //
java.home: JDK16 // Debugger for Java: 0.33.1
This question already has answers here:
Getting the following error - No suitable driver found for jdbc:postgresql://localhost: 5432/testDBMS
(4 answers)
Closed 3 years ago.
I'm getting an error java.sql.SQLException No suitable driver for jdbc:derby:books when I try to run a file from command line. In Eclipse, everything works fine. I read a book "Java, How To Program" Deitel&Deitel and the file is an example from it. When I try to compile program from command line it shows no error, but the problem is with running. Please help
public class DisplayAuthors {
public static void main(String args[]) {
final String DATABASE_URL = "jdbc:derby:books";
final String SELECT_QUERY =
"SELECT authorID, firstName, lastName FROM authors";
String user="deitel";
String password="deitel";
try (
Connection connection = DriverManager.getConnection(
DATABASE_URL, user,password);
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(SELECT_QUERY)) {
ResultSetMetaData metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
System.out.printf("Table Authors database books:%n%n");
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();
}
}
}
Command line execution:
javac DisplayAuthors.java
java DisplayAuthors
You are running in the command line your class file without the dependencies.
In your eclipse IDE you maybe have a derby.jar or similar dependencies and eclipse adds all automatically to the execution. Is required to add all the dependencies when you are executing directly from the command line.
If you are note creating a runnable jar with dependencies in MANIFEST.MF and you are trying to execute the class directly is required to add the -cp parameter with the path to all the dependencies:
Example:
java -cp Derby.jar;. DisplayAuthors
Summing that the Derby.jar and your class are in the same place and there is no more dependencies to add.
More information about:
Java Command line (Oracle Java9 SE)
Differences between "java -cp" and "java -jar"?
java.sql.SQLException. No suitable driver for jdbc
The above error jumps when JDBC DriverManager can't find any suitable driver for the given connection URL. Either the JDBC driver isn't loaded at all before connecting the DB, or the connection URL is wrong.
The URL should be like this,
jdbc:derby://localhost:1527/dbname;create=true;
or
jdbc:derby:books;create=true;
Use create=true if you want the database to be created if it doesn't exist.
And finally, check that Derby JAR file is on the classpath. If you can't find it, then you can download the JAR from here and add to the project Library folder.
For Apache Derby, the driver class name is org.apache.derby.jdbc.ClientDriver. So put that as follows,
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection connection = DriverManager.getConnection(DATABASE_URL, user, password);
Make sure your URL, username and the password is correct, and try to run your code.
I am new to PostgreSQL (I normally use other database engines), and I also do not use Java often.
My Problem is that I get the following exception:
java.sql.SQLException: No suitable driver found for DATABASE_NAME
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:702)
at
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
I followed this tutorial: http://www.postgresqltutorial.com/postgresql-jdbc/connecting-to-postgresql-database/ and added postgresql-42.2.5.jar as a library.
The problem is that adding the driver as a library, as can be seen in the screenshot, has no effect.
So my question is: how do I connect to a PostgreSQL database using Java and the latest IntelliJ?
Any help would be appreciated.
UPDATE 1:
UPDATE 2:
Since the code has been requested: I have replaced the original code by a minimal code that will cause the error:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class IngestData
{
protected static String url;
protected static final String user = "user";
protected static final String password = "password";
public static void main(String[] args)
{
Connection connection = null;
url = args[args.length-1];
try
{
connection = DriverManager.getConnection(url, user, password);
System.out.println("SUCCESS");
} catch (SQLException e)
{
System.out.println("ERROR");
e.printStackTrace();
}
}
}
The console output is:
ERROR
java.sql.SQLException: No suitable driver found for http://127.0.0.1:10282/db01617792
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:702)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
at IngestData.main(IngestData.java:17)
Process finished with exit code 0
Here is the link to the git repository containing the code:
https://github.com/ka6555/StackOverflow-Postgresql-Problem.git
UPDATE 3:
I found the error:
I need to change
protected static String url;
to
protected static String url = "jdbc:postgresql://";
and
url = args[args.length-1];
to
url += args[args.length-1];
While this solves my original problem, the program is now stuck executing the following line:
connection = DriverManager.getConnection(url, user, password);
There is no error but the program will simply run like with an endless loop never going beyond this code line.
UPDATE 4:
I have fixed all problems now.
It seems like you are missing the postgres jar file in your project dependencies.
Open the Project Structure (Ctrl+Alt+Shift+S on Windows)
Select modules / dependencies tab
You should see something like the following:
If the postgres dependency is missing:
Klick on the + sign on the right side of the screenshot
Choose Library/Project Library and your postgres jar file
Your code should now run. Let me know if it helps.
Note: Please provide your minmal working code on GitHub for a quicker response.
The main problem was that I used a command line parameter as the database url without prefixing it with jdbc:postgresql://. Additionally, I had to reinstall postgresql because of some odd behavior I could not figure out the reason for.
This is the message you get when the URL syntax is incorrect.
This is the requirement.
I want to connect to the oracle DB using Play Framework 1.2.5. FOr this I have modified the application.conf file as follows:
db.url=jdbc:oracle:thin:#localhost:1521/orcl
db.driver=oracle.jdbc.OracleDriver
db.user=system
db.pass=tiger
Then I tried to add the driver i.e. classes12.jar/odbc5.jar but everytime when i try to run it, I am getting the exception:
Cannot connect to the database, Driver not found
For adding the jar file in Eclipse IDE, below are the steps I tried:
1) Added it in the lib folder (present under the root directory of my new application) and then added it to the java build path
2) Added it in the framework/lib folder (inside the downloaded framework folder) and then added it to the java build path
In both the cases, I am getting the above mentioned exception.
Also, Please list down the steps for connection to an oracle db, I am not able to find it anywhere in the documentation
EDIT
I am able to add the jar in the classpath, everything was fine except that I did not restarted the server once it failed to connect the jar.
I did this code for fetching some data from the database:
Connection conn = DB.getConnection();
PreparedStatement stmt = null;
System.out.println(conn);
try {
stmt = conn.prepareStatement("select dept_id from emp where emp_id = 11");
ResultSet rs = stmt.executeQuery();
while (rs.next()) {
System.out.println("Dept Id: " + rs.getInt("dept_id"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
This approach is working but I am having a confusion:
If I comment the entire block of code and run the application then I can see the message in the console stating the connection is made to the DB. Hence :
1) Is the above block of code the right approach to fetch the data from Oracle DB or something better than this is present?
2) Is it like for the entire application lifetime, the connection with tht DB will persist?
I am a newbie in this, hence struggling :(
Please let me know hoe to proceed with this.
Regards
Oracle db driver class name is oracle.jdbc.driver.OracleDriver
I have Eclipse Indigo on Mac Os X and I have downloaded mysql connector (version 5.1).
I have added the jar to the project and I am using this code:
public class Test
{
public static void main (String[] args)
{
try {
String url = "jdbc:msql://200.210.220.1:1114/Demo";
Connection conn = DriverManager.getConnection(url,"","");
Statement stmt = conn.createStatement();
ResultSet rs;
rs = stmt.executeQuery("SELECT Lname FROM Customers WHERE Snum = 2001");
while ( rs.next() ) {
String lastName = rs.getString("Lname");
System.out.println(lastName);
}
conn.close();
} catch (Exception e) {
System.err.println("Got an exception! ");
System.err.println(e.getMessage());
}
}
}
When I try to execute the program I get this exception:
Got an exception!
No suitable driver found for jdbc:msql://200.210.220.1:1114/Demo
My question is : how to install the driver? What else should I do?
And once installed the driver, how do I get my database URL (I am using mysql 5.5)?
I haven't found a valid guide on the web, they're all too specific.
Your JDBC connection URL is not correct, refer to the official documentation to check the required format for the URL .
In your case the URL will become :
String url = "jdbc:mysql://200.210.220.1:1114/Demo";
you're missing the "y" in jdbc:mysql
You are using MySQL, the URL should look like this:
jdbc:mysql://200.210.220.1:1114/Demo
may be, review the IP and PORT.
You may have added the jar to your project but have you also added it to the project classpath? Having the jar exist as a file in your project won't solve the problem. The jar file is clearly not accessible to your program. Right click on your project -> Build Path -> add the jar there.
Database URL looks ok, assuming you have the right host address and port number.