java - 为什么没有找到适合 mysql 消息的驱动程序？

Question

这是我的代码片段，

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，我得到了这样的结果。

Answer 1

实际上，您的陈述中有错误DELETE，您缺少FROM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

试试，jdbc:mysql不mysql:jdbc

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

• MySQL 和 JAVA JDBC

Answer 2

尝试

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

文档说：

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

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

此外，URL 应该是

jdbc:mysql://localhost/3306/raja

并不是

mysql:jdbc://localhost/3306/raja

Answer 3

您需要 mySQL Java 连接器。您可以在此处的下载页面找到：

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