java - 将执行插入数据库

Question

我想将编码结果插入数据库，我该怎么做？ 我有一个使用 java mail 来获取电子邮件的编码，代码运行成功，但后来我想将它(电子邮件)存储到我的数据库中。

这是我的代码:

package ta_aing;

import com.mysql.jdbc.PreparedStatement;
import java.util.*;
import javax.mail.*;
import java.sql.Connection;
import java.sql.Statement;
import ta_aing.connection;

public class baca_email {


    public static void main(String[] args) {
        Properties props = new Properties();
        connection datMan = new connection();
        props.setProperty("mail.store.protocol", "imaps");
        try {
            Session session = Session.getInstance(props, null);
            Store store = session.getStore();
            store.connect("imap.gmail.com", "email", "password");
            Folder inbox = store.getFolder("INBOX");
            inbox.open(Folder.READ_ONLY);
            Message msg = inbox.getMessage(inbox.getMessageCount());
            Address[] in = msg.getFrom();
            for (Address address : in) {
                System.out.println("FROM:" + address.toString());
            }
            Multipart mp = (Multipart) msg.getContent();
            BodyPart bp = mp.getBodyPart(0);
            System.out.println("SENT DATE:" + msg.getSentDate());
            System.out.println("SUBJECT:" + msg.getSubject());
            System.out.println("CONTENT:" + bp.getContent());

            String sql = "insert into email (sender, sent_date, subject, content) values (address.toString, msg.getSentDate,msg.getSubject,bp.getContent)";

            Connection conn;
            conn = datMan.logOn();
            PreparedStatement statement;

        } catch (Exception mex) {
            mex.printStackTrace();
        }
    }
}

Answer 1

不要在查询字符串中设置属性，请使用 ?对于准备好的语句，JDBC 会池化准备好的语句并更改 ? 的值。即时运行以节省空间。将其放入查询中就达不到目的。

String sql = "insert into email (sender, sent_date, subject, content) values (" +
        "?, ?,?,?)";

 PreparedStatement statement = con.prepareStatement(updateString);
 statement.setString(1,address.toString());
 statement.setString(2,msg.toString());
 statement.setString(3,msg.getSubject());
 statement.setString(4,bp.getContent());
 statement.executeQuery();