Question

 import java.sql.*;

    public class MysqlConnect{

      public static void main(String[] args) {

        System.out.println("MySQL Connect Example.");

        Connection conn = null;

        String url = "jdbc:mysql://localhost:3306/";

        String dbName = "sint";

        String driver = "com.mysql.jdbc.Driver";

        String userName = "root"; 

        String password = "najeer";

        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) {

          e.printStackTrace();
        }

      }

    }

哈，所有我试着这个..然后

c:/>java MysqlConnect.java

C:\>java -cp .;\local\lib\mysql-connector-java-5.1.15-bin.jar MysqlConnect

MySQL Connect示例。

Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/SQLClientInf
oException

        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at com.mysql.jdbc.ConnectionImpl.<clinit>(ConnectionImpl.java:270)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:305)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at MysqlConnect.main(MysqlConnect.java:15)

发生此类型错误请帮助任何人......

Answer 1

如果你可以在类路径中包含rt.jar，那么异常就会消失。

Answer 2

您尚未正确编译文件。您已使用c:/>java MysqlConnect.java进行编译。相反，您应该使用c:/>javac MysqlConnect.java。在运行程序之前，确保类文件确实存在。

使用mysql的jdbc连接

2 个答案: