[英]How to fix the ERROR PACKAGE com.mysql does not exist
如何修復這個程序?
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
class MySqlData {
public static void main(String args[]) throws Exception {
DriverManager.registerDriver(new com.mysql.jdbcDriver());
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test/user=root&password=merimaa");
Statement stmt = con.createStatement();
ResultSet res=stmt.executeQuery("Select * from employee");
while (res.next()) {
System.out.println(res.getString("employee_name"));
}
con.close();
}
}
正如其他人所說:
將 Jar 文件添加到 WEB-INF/lib。
下面使用
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
try {
String connectionURL = "jdbc:mysql://host/db";
Connection connection = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
connection = DriverManager.getConnection(connectionURL, "username", "password");
if(!connection.isClosed())
out.println("Successfully connected to " + "MySQL server using TCP/IP...");
connection.close();
}catch(Exception ex){
out.println("Unable to connect to database"+ex);
}
將包含 sql 驅動程序的適當 jar 文件添加到您的類路徑
首先你需要下載一個 mysql 驅動程序,然后在與 mysql 的連接周圍設置一些異常捕獲器,或者拋出一些異常。
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