JBDC练习题

public class TestZSGC {
    /*
        查询所有
        1.SQL: select * from tb_brand;
        2.参数: 不需要
        3. 结果: Lise<Brand>
     */
    @Test
    public void testSelectAll() throws Exception{
        //1.获取Connection
        Properties prop = new Properties();
        prop.load(new FileInputStream("E:\\idea_java_project\\jdbc\\jdbc-demo\\src\\druid.properties"));

        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);
        //获取数据库链接 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
        ArrayList<Brand> brands = new ArrayList<>();
        Brand brand = null;
        while(rs.next()){
//            brands.add(new Brand(rs.getInt("id"),rs.getString("brand_name"),
//                    rs.getString("company_name"),rs.getInt("ordered"),
//                    rs.getString("description"),rs.getInt("status")));
            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Brand对象
            brand = new Brand();
            brand.setId(id);
            brand.setBrandName(brandName);
            brand.setCompanyName(companyName);
            brand.setOrdered(ordered);
            brand.setDescription(description);
            brand.setStatus(status);

            //装载集合
            brands.add(brand);
        }
        System.out.println(brands);

        //7.释放资源
        rs.close();
        pstmt.close();
        conn.close();
    }


    //插入
    @Test
    public void testAdd() throws Exception{
        //接受页面提交的参数
        String brandName = "香飘飘";
        String companyName = "香飘飘奶茶公司";
        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("E:\\idea_java_project\\jdbc\\jdbc-demo\\src\\druid.properties"));

        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);
        //获取数据库链接 Connection
        Connection conn = dataSource.getConnection();

        //2.定义SQL语句
        String sql = "insert into tb_brand (brand_name, company_name, ordered, description, status)\n" +
                "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();//影响行数
        //6.处理结果
        System.out.println(count>0);

        //7.释放资源
        pstmt.close();
        conn.close();

    }


    //更新
    @Test
    public void testUpdate() throws Exception{
        //接受页面提交的参数
        String brandName = "香飘飘";
        String companyName = "香飘飘奶茶公司";
        int ordered = 1000;
        String description = "绕地球三圈";
        int status = 1;
        int id = 4;

        //1.获取Connection
        Properties prop = new Properties();
        prop.load(new FileInputStream("E:\\idea_java_project\\jdbc\\jdbc-demo\\src\\druid.properties"));

        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);
        //获取数据库链接 Connection
        Connection conn = dataSource.getConnection();

        //2.定义SQL语句
        String sql = " update tb_brand\n" +
                "         set brand_name  = ?,\n" +
                "         company_name= ?,\n" +
                "         ordered     = ?,\n" +
                "         description = ?,\n" +
                "         status      = ?\n" +
                "     where id = ?";

        //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);
        pstmt.setInt(6,id);

        //5.执行SQL
        int count = pstmt.executeUpdate();//影响行数
        //6.处理结果
        System.out.println(count>0);

        //7.释放资源
        pstmt.close();
        conn.close();

    }

    //删除
    @Test
    public void testDelete() throws Exception{
        //接受页面提交的参数

        int id = 4;

        //1.获取Connection
        Properties prop = new Properties();
        prop.load(new FileInputStream("E:\\idea_java_project\\jdbc\\jdbc-demo\\src\\druid.properties"));

        //获取连接池对象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(prop);
        //获取数据库链接 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);

        //4.设置参数
        pstmt.setInt(1,id);

        //5.执行SQL
        int count = pstmt.executeUpdate();//影响行数
        //6.处理结果
        System.out.println(count>0);

        //7.释放资源
        pstmt.close();
        conn.close();

    }
}