spring jdbc传参及处理查询

Posted 2020-09-30

传参有两种传参方式，一种直接传，一种通过对象传。

 

查询返回值，可以直接封进对象。

public class springJdbcTest {
	private static JdbcTemplate jdbcTemplate;
	private static String uuid;
	@BeforeClass
	public static void  init(){
	ApplicationContext context = new ClassPathXmlApplicationContext("/spring/applicationContext-pool2.xml");
		jdbcTemplate = (JdbcTemplate) context.getBean("jdbcTemplate");
		uuid=UUID.randomUUID().toString();
	}
	@Test
	public void add(){
		String sql = "insert into t_user_test(uid,loginname,loginpass) values(?,?,?)";
		System.out.println(uuid);
		jdbcTemplate.update(sql, uuid,"test"+System.currentTimeMillis(),"pass");
	}
	@Test
	public void update(){
		String sql = "update t_user_test set loginname=? where uid = ?";
		jdbcTemplate.update(sql,new Object[] {"张三",uuid});//两种方式
	}

//查询
	@Test//数量
	public void testqueryCount() {
		String sql = "select count(*) from t_user_test";  
		int count = jdbcTemplate.queryForObject(sql, Integer.class);
		System.out.println("count----" +count);
	}
	
	@Test
	public void testqueryUserList() {
		String sql = "select * from t_user_test ";  
		
		List<User> list = jdbcTemplate.query(sql,new UserRowMapper());
		//传回List<Map<String, Object>> 
		List<Map<String, Object>> list2 = jdbcTemplate.queryForList(sql);
		System.out.println(list2);
//直接传回user
//		User user = jdbcTemplate.queryForObject(sql, new UserRowMapper(), id);
//		System.out.println("testqueryUser--" + user.getName());
		System.out.println(list);
	}
	
	@Test
	public void testqueryUser() {
		String sql = "select * from t_user_test where uid =? ";  
		User user = jdbcTemplate.queryForObject(sql, new UserRowMapper(), uuid);
		System.out.println("testqueryUser--" + user.getName());
	}
	
	 class UserRowMapper implements RowMapper<User> {  
	        //rs为返回结果集，以每行为单位封装着  
	        @Override  
	        public User mapRow(ResultSet rs, int rowNum) throws SQLException {  
	            // TODO Auto-generated method stub  
	            User user = new User();  
	            user.setName(rs.getString("loginname"));
//	            user.setId(rs.getInt("id"));  
//	            user.setUsername(rs.getString("username"));  
//	            user.setPassword(rs.getString("password"));  
	            return user;  
	        }  
	     } 
}