使用 JdbcTemplate和JdbcDaoSupport

//@Test
   public void testStudentsDao()
   {
       Students student =studentsDao.getStudents("001");
       System.out.println(student);
   }
   //@Test
   public void testEmployeeDao()
   {
       Employee employee=employeeDao.getEmployee(1);
       System.out.println(employee);
   }
   /**
   * 获取单个列的值，或统计查询
   * 使用queryForObject(String sql, Class<Long> requiredType)
   */
   //@Test
   public void testQueryForObject2()
   {
       String sql="select count(id) from employee";
       long count=jdbcTemplate.queryForObject(sql, Long.class);
       System.out.println(count);
   }
   /***
   * 查询实体类的集合
   * 注意调用的不是queryForList方法
   */
   //@Test
   public void testQueryForList()
   {
       String sql="select id,name,sex,dept_id from employee where id>?";
       RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);
       List<Employee> employee=jdbcTemplate.query(sql,rowMapper,2);

       System.out.println(employee);
   }
   /**
   * 从数据库中获取一条记录，实际得到对应的一个对象
   * 需要调用queryForObject(String sql, RowMapper<Students> rowMapper, Object... args)
   *1、其中的RowMapper指定如何去映射结果集的行，常用的实现类为BeanPropertyRowMapper
   *2、使用SQL 中列的别名完成列名和属性名的映射。（视频写，我没写，就是起别名，别名是属性名）
   *3、不支持级联属性，JsbcTemplate 只是一个JDBC的小工具，而不是ORM框架
   */
   //@Test
   public void testQueryForObject()
   {
       String sql="select stuID,stuName,stuSex,stuAge,stuDept from students where stuID=?";
       RowMapper<Students> rowMapper=new BeanPropertyRowMapper<>(Students.class);
       Students student =jdbcTemplate.queryForObject(sql, rowMapper,"001");

       System.out.println(student);
   }
   /**
   * 执行批量更新：批量的insert,update,delete
   * 最后一个参数是Object[] 的List类型：因为修改一条记录需要一个Object[]
   * ,那么多条就需要多个Object,所以用List
   */
   //@Test
   public void testBatchUpdate()
   {
       String sql="insert into students(stuID,stuName,stuSex,stuAge,stuDept) values(?,?,?,?,?)";
       List<Object[]> batchArgs=new ArrayList<>();
       batchArgs.add(new Object[]{"010","010","男","10","二进制"});
       batchArgs.add(new Object[]{"011","011","男","11","二进制"});
       batchArgs.add(new Object[]{"012","012","男","12","二进制"});
       batchArgs.add(new Object[]{"013","013","男","13","二进制"});
       batchArgs.add(new Object[]{"014","014","男","14","二进制"});
       jdbcTemplate.batchUpdate(sql, batchArgs);
   }
   /**
   * 执行 insert,update,delete
   */
   //@Test
   public void testUpdate()
   {
       String sql="update students set stuName=? where stuId=?";
       jdbcTemplate.update(sql,"jack","005");

   }
   //@Test
   public void testDataSource() throws SQLException
   {
       DataSource dataSource=ctx.getBean(DataSource.class);
       System.out.println(dataSource.getConnection());
   }

使用 JdbcTemplate和JdbcDaoSupport

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