JDBC 驱动程序问题 (SQL Server 18)

Question

java.sql.SQLException: No suitable driver found

I've been having a lot of difficulty with the JDBC on SQL Server. My goal here is to unearth the exact cause of the issue/error at hand. I don't think it has anything to do with the driver itself; I added mssql-jdbc-8.2.0jre13.jar to the referenced library for this project as well as adding jdk-13.0.1 under "installed JRE's" to ensure compatibility with the driver. Lastly, I added the line

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

but I'm still getting the same issue. Is it the URL itself that's causing the issue? I'm not sure if that's the right URL I should be using. The database that I'm currently trying to access is premade and has the server name

occam-dbserver.cs.qc.cuny.edu\\dbclass,21433 .

Must this be in the URL? Must it be something like

jdbc:sqlserver://occam-dbserver.cs.qc.cuny.edu:21433;Northwinds2019TSQLV5 .

package JBDC;

import java.sql.*;

public class Driver {

public static void main(String[] args) throws SQLException {

    Connection myConn = null;
    Statement myStmt = null;
    ResultSet myRs = null;
    String url = "jdbc:sqlserver:localhost:1433;Northwinds2019TSQLV5";
    String user = "student";
    String password = "abc";
    try {

        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

        myConn = DriverManager.getConnection(url, user , password);

        myStmt = myConn.createStatement();

        myRs = myStmt.executeQuery("SELECT *\r\n" + 
                "FROM [HumanResources].[Employee]");

        while (myRs.next()) {
            System.out.println(myRs.getString("EmployeeFirstName") + ", " + myRs.getString("EmployeeLastName"));
        }
    }
    catch (Exception exc) {
        exc.printStackTrace();
    }
    finally {
        if (myRs != null) {
            myRs.close();
        }

        if (myStmt != null) {
            myStmt.close();
        }

        if (myConn != null) {
            myConn.close();
        }
    }
}

}

The specific error I'm getting is

java.sql.SQLException: No suitable driver found for jdbc:sqlserver:localhost;Northwinds2019TSQLV5
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:702)
    at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:228)
    at JDBC.Driver.main(Driver.java:19)

Answer 1

The .jar file is loaded on this line:

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");

So that's not your problem. Compare your url

jdbc:sqlserver:localhost:1433;Northwinds2019TSQLV5

to the example from the Docs

 jdbc:sqlserver://<server>:<port>;databaseName=AdventureWorks;user=<user>;password=<password>

So perhaps:

String url = "jdbc:sqlserver://localhost:1433;databaseName=Northwinds2019TSQLV5";