java多线程操作两个数据库.

版权声明： https://blog.csdn.net/eds124/article/details/84866385

package com.dinglin;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Hashtable;
import java.util.Vector;

public class Main {

	public static void main(String[] args) throws Exception {

		Dao d1 = new Dao("jdbc:mysql://127.0.0.1:3306/mydata1", "select * from t_user");
		Thread t1 = new Thread(d1);
		t1.start();
		Dao d2 = new Dao("jdbc:mysql://127.0.0.1:3306/mydata2", "select * from t_user");
		Thread t2 = new Thread(d2);
		t2.start();
		Thread.sleep(2000);
		for (Hashtable<String, Object> hso : d1.vhso) {
			System.out.println(hso.get("userid").toString() + hso.get("username") + hso.get("password"));
		}
		for (Hashtable<String, Object> hso : d2.vhso) {
			System.out.println(hso.get("userid").toString() + hso.get("username") + hso.get("password"));
		}

	}
}

class Dao implements Runnable {
	private Connection c = null;
	private PreparedStatement ps = null;
	private ResultSet rs = null;
	Vector<Hashtable<String, Object>> vhso = new Vector<>();
	private String connstr = null;
	private String sql = null;

	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public Dao(String connstr, String sql) {
		this.connstr = connstr;
		this.sql = sql;
	}

	public void run() {
		try {
			c = DriverManager.getConnection(connstr, "root", "");
			ps = c.prepareStatement(sql);
			rs = ps.executeQuery();
			while (rs.next()) {
				Hashtable<String, Object> hso = new Hashtable<>();
				hso.put("userid", rs.getInt(1));
				hso.put("username", rs.getString(2));
				hso.put("password", rs.getString(3));
				vhso.add(hso);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}