maven的java工程取mysql数据库

Posted 2021-11-26 jec1999

1 新建maven的java工程，pom文件导入mysql的坐标

  <dependencies>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
  </dependencies>

2 项目结构截图

3 部分代码

ItemsDaoImpl.java

package com.sui.dao.impl;

import com.sui.dao.ItemsDao;
import com.sui.domain.Items;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;


public class ItemsDaoImpl implements ItemsDao {

    public List<Items> findAll() throws Exception{
        Connection connection = null;
        CallableStatement pst = null;
        ResultSet rs = null;
        ArrayList<Items> list = new ArrayList<Items>();
        try {
            // 加载驱动类
            Class.forName("com.mysql.jdbc.Driver");

            //获取connection对象
            connection = DriverManager.getConnection("jdbc:mysql:///maven","root","123456");

            //获取真正操作数据库的对象
            pst = connection.prepareCall("select * from items");

            //执行数据库查询操作
            rs = pst.executeQuery();

            //把数据结果转成java的list集合
            while (rs.next()) {
                Items items = new Items();
                items.setId(rs.getInt("id"));
                items.setName(rs.getString("name"));
                list.add(items);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            connection.close();
            pst.close();
            rs.close();
        }


        return list;
    }
}

完毕，附代码。