We Keep Coding

Unable to load suitable drive from java 18 on linux 24.02.1 wsl with mysql version 8.0.31 [duplicate]

This question already has answers here:
Connect Java to a MySQL database
(14 answers)
What is a classpath and how do I set it?
(10 answers)
Closed last month.
I get the following error when trying to execute a Java program with SQL code:
java.sql.SQLException: No suitable driver found for
jdbc:mysql://localhost/opiejbc1
I have installed the driver mysql-connector-j-8.0.31.jar in /usr/share/java
I have called the class with java -cp ./:/usr/share/java TestApplication
and with CLASSPATH=./:/usr/share/java set.
My Java code is as follows:
import java.sql.*;
public class TestApplication {
static final String DB_URL = "jdbc:mysql://localhost/opiejbc1";
static final String USER = "opiejbc1";
static final String QUERY = "SELECT * FROM Test1";
public static void main(String[] args) {
// Open a connection
try(Connection conn = DriverManager.getConnection(DB_URL, USER, "");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(QUERY);) {
// Extract data from result set
while (rs.next()) {
// Retrieve by column name
System.out.print("Name: " + rs.getInt("Name"));
System.out.print(", Phone: " + rs.getInt("Phone"));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
I have tried inserting Class.forName("com.mysql.cj.jdbc.Driver"); immediately after the try statement, but then I get the following error:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error on token(s), misplaced construct(s)
at TestApplication.main(TestApplication.java:10)
What am I doing wrong?
I have tried all the recommended solutions as far as I know, but I still get those errors.

As noted by #g00se, the real problem is that the JAR file for the Connector/J driver is not on your runtime classpath. So the java runtime cannot find it.
Solution: put the JAR file on the classpath.
Notes:
If you use a -cp option, the CLASSPATH environment variable is ignored.
If you put a directory on the classpath, you are NOT telling the java to put JAR files (in that directory) on the classpath.
If you wanted to put all JAR files in (say) "/usr/share/java" on the classpath, you could use a wildcard entry; e.g. -cp .:/usr/share/java/*.jar. Note that the *.jar is not shell globbing. It needs to be processed by the java command. (In some cases you may need to escape it to prevent globbing.)
You should (IMO) take the time to read the Oracle documentation on how the classpath works.
Adding a Class.forName call is NOT recommended (except by people who don't understand the problem). If the drivers are on the classpath then DriverManager will find them. And if they are not on the classpath, then using Class.forName is going to fail.
But the reason that you got a compilation error was that you were inserting it at the wrong place:
try ( // HERE is the wrong place
Connection conn = DriverManager.getConnection(DB_URL, USER, "");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(QUERY);) {
The try with resources syntax only allows variable declarations with initializers in that context. A Class.forName call is not such a thing.
I haven't checked, but I think that inserting
Class dummy = Class.forName("com.mysql.cj.jdbc.Driver");
at // HERE in the above would make the compiler happier. But DON'T. It is unnecessary. It won't help. See above for the correct solution.

Cannot connect to access database from jar file [duplicate]

This question already has an answer here:
Manipulating an Access database from Java without ODBC
(1 answer)
Closed 6 years ago.
I cannot connect to my access database using jdbc:ucanaccess driver.
Here the code:
public void open_conn()
{
try
{
Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
String url = "jdbc:ucanaccess://C:\\AnalysisLab\\dbanal.accdb";
conn = DriverManager.getConnection(url, "username", "password");
stmt = conn.createStatement();
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null,"Error: "+e.getLocalizedMessage()); e.printStackTrace();
}
}
The error reported : "Error: net.ucanaccess.jdbc.UcanaccessDriver"
I tried including org-netbeans-modules-db-mysql.jar file in the jar directory, but it doesn't work.

This documentation says that your URL should be in the following format:
Connection conn=DriverManager.getConnection("jdbc:ucanaccess://",user, password);
// for example:
Connection conn=DriverManager.getConnection("jdbc:ucanaccess://c:/pippo.mdb");
So your URL is going to change to:
String url = "jdbc:ucanaccess://C:\\AnalysisLab\\dbanal.accdb";
And add the following jar files to your CLASSPATH as all of these are needed by the actual JDBC driver itself:
ucanaccess-3.0.3.jar
commons-lang-2.6.jar
commons-logging-1.1.1.jar
hsqldb.jar
jackcess-2.1.3.jar
As per your question, I assume that you are on Netbeans and hence you need to all these 5 jars there in the following manner:
Expand the tree view for your project, right-click the "Libraries" folder and choose "Add JAR/Folder...", then browse to the JAR file.
A very detailed explanation of a similar question can be found here.

trying to connect to mysql database

I'm trying to connect to my database. I added the MySQL connector driver jar by
creating a folder called lib
Putting the jar inside lib
Right Clicking on the project >> Properties >> build path >> (going inside the libraries tab) >> adding jar
my code looks like this:
public static void main(String[] args) {
try {
Connection myConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/world", "user", "pass");
Statement myStat = myConn.createStatement();
ResultSet myRs = myStat.executeQuery("Select * from city");
while (myRs.next()) {
System.out.println(myRs.getString("Name"));
}
}
catch (Exception exc) {
exc.printStackTrace();
}}
ERROR:
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/world
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at javademo4.driver.main(driver.java:8)
I'm using Eclipse Luna and mysql-connector-java-5.0.8-bin.jar. I also definitely have a database called world and a table called city which has a column called Name

First of all you have to register your mysql driver, add this line above the Connection line Class.forName("com.mysql.jdbc.Driver")
Hope it helps

Connecting to a mySQL database using Java

So I just started learning about databases this week and one of the things I need to be able to do is connect to my mySQL database that I created using Java. I have done some research and I have tried to find the correct way of doing this I just can't seem to figure out how. Here is my code:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class Menu
{
public void menu()
{
Connection conn;
String url = "jdbc:mysql://localhost:3306/";
String dbName = "gym";
String driver = "com.mysql.jdbc.Driver";
String userName = "root";
String password = "password";
try
{
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url+dbName,userName,password);
System.out.println("Connected to the database");
conn.close();
System.out.println("Disconnected from database");
}
catch (Exception e)
{
System.out.println("NO CONNECTION =(");
System.out.println(e.getMessage());
}
}
}
Now the problem is, is that every time I run this code, the "No Connection =( " appears and then it says the error is: "com.mysql.jdbc.Driver". Can somebody please help me and say what I am doing wrong? Thank you. Much appreciated.

Your error means that your library path doesn't contain the jar that contains the com.mysql.jdbc.Driver class.
You don't have to change anything in your code. If you are running it via Eclipse, you should add mysql-connector-java-x.x.x-bin.jar to your build path (where x.x.x is the version of the jar).

All JDBC connection classes need their respective drivers which are normally supplied as jar files from the database vendor, add the relevant database driver to your classpath.
The .jar file will be available from the vendors site, in this case : http://www.mysql.com/products/connector/ and then to add this to the classpath of your project in the ide of your choice. Here is a guide for eclipse : http://www.wikihow.com/Add-JARs-to-Project-Build-Paths-in-Eclipse-(Java)
Try and run again once you have this.

how to link java and mysql

I created a database from the command line and wrote Java code to access the database. My code prints an error on execution. Can anyone tell me how to connect the JDBC driver with Java?
import java.sql.*;
class Test{
public static void main(String arg[]){
try{
String query="select * from photo ";
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection
("jdbc:mysql://localhost/mydb","user","password");
Statement st=con.createStatement();
ResultSet rs=st.executeQuery(query);
rs.next();
String sname=rs.getString(2);
System.out.println(sname);
con.close();
}
catch(Exception e)
{
System.out.println("error ");
}
}
}

First of all remove the space at the end of the query
String query="select * from photo ";
Next try giving the port in the url
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","user","password");
Finally as you said its giving you java.lang.ClassNotFoundException:com.mysql.jdbc.Driver
you need to add the mysql-connector.jar in your classpath.Get the jar from here
Well if you are using command prompt you can run like this
java -cp .;completePathOfMysqlConnector/mysql-connector-java-5.1.6.jar className
If you are using elipse then download the jar and add it to the classpath like this
Right click on the project -> properties ->java build path ->switch to libraries tab -> add external jar then select the jar and ok you are done

1>it seems that SQL port is not assigned (default is 3306) in "jdbc:mysql://localhost"
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","user","password");
2> should download and add mysql-connector-java to library
Hope this would help