查询数据

Posted 2020-10-16 亲亲的我来了

package cn.fly;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.log4j.Logger;

/**
 * 更新数据
 * 
 * @author ASUS
 * 
 */
public class Query {
    private static Logger logger = Logger.getLogger(Test1.class.getName());

    public static void main(String[] args) {
        Connection conn = null;
        Statement stat = null;
        ResultSet rs = null;
        // 1.加载驱动
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            logger.error(e);
        }
        // 2.建立连接
        try {
            conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/epet", "root", "root");
            // 更新狗狗信息到数据库
            stat = conn.createStatement();
            rs = stat.executeQuery("select * from dog");
            System.out.println("\t\t狗狗信息列表");
            System.out.println("编号\t姓名\t健康值\t亲密度\t品种");
            while (rs.next()) {
                System.out.print(rs.getInt(1) + "\t");
                System.out.print(rs.getString(2) + "\t");
                System.out.print(rs.getInt(3) + "\t");
                System.out.print(rs.getInt(4) + "\t");
                System.out.println(rs.getString(5));
            }
            logger.info("查询成功~~~");
        } catch (SQLException e) {
            logger.error(e);
        } finally {
            // 3.关闭连接
            if (stat != null) {
                try {
                    stat.close();
                } catch (SQLException e) {
                    logger.error(e);
                }
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    logger.error(e);
                }
            }
        }
    }
}