jdbc到MYSQL错误:找不到适用于jdbc:mysql://localhost:3306/test的驱动程序?

问题描述

我有以下代码可连接到mysql db:

I have the following code to connect to a mysql db :

public static void insertIntoDatabase(String code,String name,String temp,String hum,String del) {
    Connection con = null;
    ResultSet rs = null;

    String url = "jdbc:mysql://localhost:3306/test";
    String user = "root";
    String password = "";

    try {
        Class.forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection(url, user, password);
        rs = con.prepareStatement("CREATE TABLE IF NOT EXISTS AiportDetails(code VARCHAR(50) PRIMARY KEY, " +
                "name VARCHAR(50), temp VARCHAR(50), hum VARCHAR(50), del VARCHAR(50)) ENGINE=InnoDB;").executeQuery();
        rs = con.prepareStatement("INSERT INTO AirportDetails(code,name,temp,hum,del) VALUES("+code+","+
                name+","+temp+","+hum+","+del+");").executeQuery();
    } catch (SQLException ex) {
        ex.printStackTrace();
    } finally {
        try {
            if (rs != null) {
                rs.close();
            }
            if (con != null) {
                con.close();
            }

        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }
}

我遇到以下错误:

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

注意我在网上发现的一些常见更正是:

NOTE Some common corrections I found online were:

1. The driver is not in the /WEB-INF/lib folder.
2. The url is wrong.

我认为我的代码不是这种情况.
谢谢.

I dont think this is the case with my code.
Thank you.

推荐答案

如果您在进行首次连接之前未加载驱动程序，则可能会发生这种情况.

That can happen if you didn't load the driver before making the first connection ever.

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

可以肯定的是，驱动程序必须进入/WEB-INF/lib，而不是进入/WEB-INF.顺便说一下，您那里有一些SQL注入漏洞.看PreparedStatement. finally也可以进行改进，就像现在一样，con不会在rs.close()引发异常时关闭.

To be sure, the driver has to go in /WEB-INF/lib, not in /WEB-INF. You've there by the way some SQL injection holes. Look at PreparedStatement. The finally can also be improved, as you have it now, the con will never be closed when rs.close() throws an exception.

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