JDBC练习，增删改查

import com.alibaba.druid.pool.DruidDataSourceFactory;
import org.junit.Test;

import javax.sql.DataSource;
import javax.swing.*;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
//测试类
public class BrandTest {
    /*
    * 查询所有
    * 1：SQL：select * from tb_brand
    * 2:参数 不需要
    * 3：结果 List<Brand>
    */

    @Test
    public  void testSelectAll()throws Exception{
    //1.获取Connection
        Properties prop =new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

        //获取数据库连接 Connection
        Connection conn = dataSource.getConnection();
      //2.定义SQL语句
      String sql ="select * from tb_brand";

      //3.获取pstmt对象
        PreparedStatement pstmt = conn.prepareStatement(sql);

      //4.设置参数


      //5.执行sql
        ResultSet rs = pstmt.executeQuery();

//      6. 处理结果 List<Brand>封装Brand对象，装在List集合
        Brand b =null;
        List<Brand> bs =new ArrayList<>();
        while (rs.next()){
            //获取数据
            int id = rs.getInt("id");
            String brandName = rs.getString("brand_name");
            String companyName = rs.getString("company_name");
            int ordered = rs.getInt("ordered");
            String description = rs.getString("description");
            int status = rs.getInt("status");
            //封装对象
            b =new Brand();
            b.setId(id);
            b.setBrandName(brandName);
            b.setCompanyName(companyName);
            b.setOrdered(ordered);
            b.setDescription(description);
            b.setStatus(status);
            //装载集合
           bs.add(b);
        }
        System.out.println(bs);
        //释放资源
        rs.close();
        pstmt.close();
        conn.close();
    }


    /*
     *添加
     * 1：SQL：insert into tb_brand (brand_name, company_name , ordered , description , status)values (?,?,?,?,?)
     * 2:参数 需要(除了id之外的所有参数)
     * 3：结果 boolean
     */

    @Test
    public  void testAdd()throws Exception{
        String brandName ="香飘飘";
        String companyName ="香飘飘";
        int ordered = 1;
        String description ="绕地球一圈";
        int status = 1;
        //1.获取Connection
        Properties prop =new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

        //获取数据库连接 Connection
        Connection conn = dataSource.getConnection();
        //2.定义SQL语句
        String sql ="insert into tb_brand (brand_name, company_name , ordered , description , status)values (?,?,?,?,?)";

        //3.获取pstmt对象
        PreparedStatement pstmt = conn.prepareStatement(sql);

        //4.设置参数
        pstmt.setString(1,brandName);
        pstmt.setString(2,companyName);
        pstmt.setInt(3,ordered);
        pstmt.setString(4,description);
        pstmt.setInt(5,status);

        //5.执行sql

        int count = pstmt.executeUpdate();//影响的行数

        //6.处理结果
        System.out.println(count>0);
        //释放资源
        pstmt.close();
        conn.close();
    }



    /*
    * 修改 update tb_brand set brand_name=?, company_name=?, ordered=?,description=?,status=? where id=?
    * 需要参数 所有的数据
    * 返回值 boolean
    * */
    @Test
    public  void testModify()throws Exception{
        String brandName ="优乐美";
        String companyName ="优乐美";
        int ordered = 1;
        String description ="你的优乐美";
        int status = 1;
        int id=4;

        //1.获取Connection
        Properties prop =new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

        //获取数据库连接 Connection
        Connection conn = dataSource.getConnection();
        //2.定义SQL语句
        String sql ="  update tb_brand set brand_name=?, company_name=?, ordered=?,description=?,status=? where id=?";

        //3.获取pstmt对象
        PreparedStatement pstmt = conn.prepareStatement(sql);


        pstmt.setString(1,brandName);
        pstmt.setString(2,companyName);
        pstmt.setInt(3,ordered);
        pstmt.setString(4,description);
        pstmt.setInt(5,status);
        pstmt.setInt(6,id);
        //5.执行sql

        int count = pstmt.executeUpdate();//影响的行数
        //6.处理结果
        System.out.println(count>0);
        //释放资源
        pstmt.close();
        conn.close();
    }
/*
* 删除
* SQL delete from tbl_brand where id=?
* 参数 需要 id
* 结果 boolean*/
    @Test
    public  void testDelete()throws Exception{
        int id=4;

        //1.获取Connection
        Properties prop =new Properties();
        prop.load(new FileInputStream("src/druid.properties"));
        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);

        //获取数据库连接 Connection
        Connection conn = dataSource.getConnection();
        //2.定义SQL语句
        String sql ="delete from tb_brand where id=?";

        //3.获取pstmt对象
        PreparedStatement pstmt = conn.prepareStatement(sql);

        pstmt.setInt(1,id);
        //5.执行sql
        int count = pstmt.executeUpdate();//影响的行数
        //6.处理结果
        System.out.println(count>0);
        //释放资源
        pstmt.close();
        conn.close();
    }
}

brand类

/*
* Alt+鼠标左键  整列编辑*/
public class Brand {
    private Integer id;
    // id主键
    private String brandName;
    // 品牌名称
    private String companyName;
    // 排序字段
    private Integer ordered;
    // 描述信息
    private String description;
    // 状态 0 :禁用 1:启用
    private Integer status ;//这里我们使用包装类是因为基本数据类型默认值0 会影响

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getBrandName() {
        return brandName;
    }

    public void setBrandName(String brandName) {
        this.brandName = brandName;
    }

    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }

    public Integer getOrdered() {
        return ordered;
    }

    public void setOrdered(Integer ordered) {
        this.ordered = ordered;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    @Override
    public String toString() {
        return "Brand{" +
                "id=" + id +
                ", brandName='" + brandName + '\'' +
                ", companyName='" + companyName + '\'' +
                ", ordered='" + ordered + '\'' +
                ", description='" + description + '\'' +
                ", status=" + status +
                '}';
    }

}

数据库代码：

drop table if exists tb_brand ; 
-- 创建tb_brand表
create table tb_brand
(
    id           int primary key auto_increment,
    -- id主键
    brand_name   varchar(20),
    -- 品牌名称
    company_name varchar(20),
    -- 排序字段
    ordered      int,
    -- 描述信息
    description  varchar(100),
    -- 状态 0 ：禁用 1： 启用
    status       int
);
-- 添加数据
insert into tb_brand (brand_name, company_name, ordered, description, status)
value ('三只松鼠', '三只松鼠股份有限公司', 5, '好吃不上火', 0),
      ('华为', '华为技术有限公司', 100, '华为致力于把数字世界带给每个人，每个家庭，每个组织，构建万物互联的智能世界', 1),
      ( '小米', '小米技术有限公司', 50, 'are you ok?', 1);