为什么在这里找不到合适的mysql消息驱动程序？

Question

这是我的代码段，

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

public class Delete
{
    public static void main(String args[])
    {
        try
        {
            Class.forName("com.mysql.jdbc.Driver");

            Connection con = DriverManager.getConnection("mysql:jdbc://localhost:3306/raja","root","459805");
            Statement stmt=con.createStatement();
            int count=stmt.executeUpdate("DELETE GENNU WHERE USER_ID=3;");
            if(count>0)
                System.out.println(" Ok Deletion done");
        }
        catch(ClassNotFoundException e)
        {
            System.out.println(e.getMessage());
        }
        catch(SQLException e)
        {
            System.out.println(e.getMessage());
        }
    }
}

当我执行它时，我就是这样的。

Answer 1

实际上您的DELETE声明中有错误，但您缺少FROM个关键字。它应该是

DELETE FROM GENNU WHERE USER_ID=3

看到错误，它指向DELETE。

更新1

尝试，jdbc:mysql而非mysql:jdbc

Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager.getConnection("jdbc:mysql://localhost:3306/raja"
              + "user=root&password=459805");

• MySQL and JAVA JDBC

Answer 2

尝试

Class.forName("com.mysql.jdbc.Driver").newInstance();

The documentation说：

        // The newInstance() call is a work around for some
        // broken Java implementations

        Class.forName("com.mysql.jdbc.Driver").newInstance();

此外，网址应为

jdbc:mysql://localhost/3306/raja

而不是

mysql:jdbc://localhost/3306/raja

Answer 3

您需要mySQL Java Connector。您可以在此处的下载页面找到：

https://www.mysql.com/products/connector/