java通过JDBC操作mysql数据库

package main;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class DBConnection {

	/**
	 * 入口函数
	 * 
	 * @param arg
	 */
	public static List<String> queryUserClosed(String today,String lastMonday) {
		List<String> beanList = new ArrayList<String>();
		try {
			Connection con = null; // 定义一个MYSQL链接对象
			Class.forName("com.mysql.jdbc.Driver").newInstance(); // MYSQL驱动
			con = DriverManager.getConnection(
							"jdbc:mysql://localhost:3306/my_db?useUnicode=true&characterEncoding=UTF-8",
							"root", ""); // 链接本地MYSQL
			Statement stmt; // 创建声明
			stmt = con.createStatement();

			// 查询数据并输出
			StringBuffer sql = new StringBuffer();
			sql.append(" select reason");
			sql.append(" from t1");
			sql.append(" GROUP BY reason");

			String selectSql = sql.toString();
			ResultSet selectRes = stmt.executeQuery(selectSql);

			while (selectRes.next()) { // 循环输出结果集
				beanList.add(selectRes.getString("reason"));
			}
		} catch (Exception e) {
			e.printStackTrace();
			System.out.print("MYSQL ERROR:" + e.getMessage());
		}
		return beanList;
	}
}

java连接mysql时，需要安装驱动。如果未安装，会出现找不到“com.mysql.jdbc.Driver”的错误。

jar包 免费下载地址：http://download.csdn.net/detail/tolcf/9555814