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README
Apache-2.0

简单介绍

easymybatis是一个mybatis增强类库,目的为简化mybatis的开发,让开发更高效。

easymybatis的特性如下:

  • 无需编写xml文件即可完成CRUD操作。
  • 支持多表查询、聚合查询、分页查询(支持多种数据库)。
  • 支持批量添加,指定字段批量添加。
  • 支持Dao层访问控制,如某个dao只有查询功能,某个dao有crud功能等。
  • 支持自定义sql,sql语句可以写在配置文件中,同样支持mybatis标签。
  • 支持mysql,sqlserver,oracle,postgresql,sqlite.其它数据库扩展方便(增加一个模板文件即可)。
  • 使用方式不变,与Spring集成只改了一处配置。
  • 支持与spring-boot集成。
  • 轻量级,无侵入性,可与传统mybatis用法共存。
  • 没有修改框架源码(无插件),可同时使用官方提供的功能。

架构组成

easymybatis的架构如下:

架构

运行流程

easymybatis的运行流程图:

运行流程

  1. 服务器启动的时候easymybatis负责扫描Dao.java。
  2. 扫描完成后解析出Dao.class以及实体类Entity.class。
  3. 代码生成组件根据Dao.class和Entity.class生成mapper文件内容,生成方式由velocity模板指定。
  4. 把mapper文件内容转化成Resource对象设置到SqlSessionFactory中。

意见交流

如果您在使用的过程中遇到问题的话可以加入** QQ群328419269 **进行提问。

完整测试用例


public class TUserDaoTest extends EasymybatisSpringbootApplicationTests {

	@Resource
	TUserDao dao;
	@Resource
	TransactionTemplate transactionTemplate;
	
	// 根据主键查询
	@Test
	public void testGet() {
		TUser user = dao.get(3);
		print(user);
	}
	
	// 根据字段查询一条记录
	@Test
	public void testGetByProperty() {
		TUser user = dao.getByProperty("username", "王五");
		print(user);
	}
	
	// 根据条件查询一条记录
	@Test
	public void testGetByExpression() {
		// 查询ID=3的用户
		Query query = Query.build().eq("id", 3);
		
		TUser user = dao.getByExpression(query);
		
		print(user);
	}
	
	// 条件查询
	// 查询username='张三'的用户
	@Test
	public void testFind() {
		Query query = new Query();
		// 添加查询条件
		query.eq("username", "张三");
		
		List<TUser> list = dao.find(query); // 获取结果集
		long count = dao.countTotal(query); // 获取总数
		print("count:" + count);
		for (TUser user : list) {
			System.out.println(user);
		}
	}
	
	// 分页查询
	/*MYSQL语句:
	 * 
	 * SELECT t.`id` , t.`username` , t.`state` , t.`isdel` , t.`remark` , t.`add_time` , t.`money` , t.`left_money` 
	 * FROM `t_user` t 
	 * ORDER BY id DESC 
	 * LIMIT ?,? 
	 * 
	 * Parameters: 2(Integer), 2(Integer)
	 */
	@Test
	public void testPage() {
		Query query = new Query();
		
		query.setPage(2, 2) // 设置pageIndex,pageSize
			.addSort("id", Sort.DESC); // 添加排序
		
		// 查询后的结果,包含总记录数,结果集,总页数等信息
		PageInfo<TUser> pageInfo = QueryUtils.query(dao, query);
		
		List<TUser> rows = pageInfo.getList();
		for (TUser user : rows) {
			System.out.println(user);
		}
	}
	
	// 自定义返回字段查询,只返回两个字段
	// SELECT t.id,t.username FROM `t_user` t LIMIT 0,10
	@Test
	public void testSelfColumns() {
		Query query = new Query();
		// 只返回id,username
		query.setColumns(Arrays.asList("t.id","t.username"));
		
		List<TUser> list = dao.find(query);
		
		for (TUser user : list) {
			System.out.println(user);
		}
	}
	
	// 多表查询,left join
	// 适用场景:获取两张表里面的字段信息返回给前端
	/* 
	 *  MYSQL生成如下sql:
		SELECT 
			t.`id` , t.`username` , t.`state` , t.`isdel` , t.`remark` , t.`add_time` , t.`money` , t.`left_money` 
			, t2.city , t2.address 
		FROM `t_user` t left join user_info t2 on t.id = t2.user_id 
		WHERE t2.id = ?
		ORDER BY id ASC 
		LIMIT ?,?
	 */
	@Test
	public void testJoin() {
		Query query = new Query();
		// 添加第二张表的字段,跟主表字段一起返回
		query.addOtherColumns(
					"t2.city"
					,"t2.address"
		);
		// 左连接查询,主表的alias默认为t
		query.join("left join user_info t2 on t.id = t2.user_id"); 
		//添加条件
		query.eq("t2.id", 2);
		
		query.addSort("t.id");
		
		List<TUser> list = dao.find(query);
		
		System.out.println("==============");
		for (TUser user : list) {
			System.out.println(
				user.getId() 
				+ " " + user.getUsername() 
				// 下面两个字段是第二张表里面的
				+ " " + user.getCity() 
				+ " " + user.getAddress()
			);
		}
		System.out.println("==============");
	}
	
	// 添加-保存所有字段
	@Test
	public void testInsert() {
		TUser user = new TUser();
		user.setAddTime(new Date());
		user.setIsdel(false);
		user.setLeftMoney(22.1F);
		user.setMoney(new BigDecimal(100.5));
		user.setRemark("备注");
		user.setState((byte)0);
		user.setUsername("张三");
		
		dao.save(user);
		
		print("添加后的主键:" + user.getId());
		print(user);
	}
	
	// 添加-保存非空字段
	@Test
	public void testInsertIgnoreNull() {
		TUser user = new TUser();
		user.setAddTime(new Date());
		user.setIsdel(true);
		user.setMoney(new BigDecimal(100.5));
		user.setState((byte)0);
		user.setUsername("张三notnull");
		user.setLeftMoney(null);
		user.setRemark(null);
		
		dao.saveIgnoreNull(user);
		
		print("添加后的主键:" + user.getId());
		print(user);
	}
	
	// 批量添加
	/*
	 * 支持mysql,sqlserver2008。如需支持其它数据库使用saveMulti方法
	 * INSERT INTO person (id, name, age)
		VALUES
    	(1, 'Kelvin', 22),
    	(2, 'ini_always', 23);
	 */
	@Test
	public void testInsertBatch() {
		List<TUser> users = new ArrayList<>();
		
		for (int i = 0; i < 3; i++) { // 创建3个对象
			TUser user = new TUser();
			user.setUsername("username" + i);
			user.setMoney(new BigDecimal(i));
			user.setRemark("remark" + i);
			user.setState((byte)0);
			user.setIsdel(false);
			user.setAddTime(new Date());
			user.setLeftMoney(200F);
			users.add(user);
		}
		
		int i = dao.saveBatch(users); // 返回成功数
		
		System.out.println("saveBatch --> " + i);
	}
	
	// 更新所有字段
	@Test
	public void testUpdate() {
		TUser user = dao.get(3);
		user.setUsername("李四");
		user.setMoney(user.getMoney().add(new BigDecimal(0.1)));
		user.setIsdel(true);
		
		int i = dao.update(user);
		print("testUpdate --> " + i);
	}
	
	// 更新不为null的字段
	/*
	 *UPDATE [t_user] SET [username]=?, [isdel]=? WHERE [id] = ?  
	 */
	@Test
	public void updateIgnoreNull() {
		TUser user = new TUser();
		user.setId(3);
		user.setUsername("王五");
		user.setIsdel(false);
		int i = dao.updateIgnoreNull(user);
		print("updateNotNull --> " + i);
	}
	
	// 根据条件更新
	// UPDATE t_user SET remark = '批量修改备注' WHERE state = 0
	@Test
	public void testUpdateNotNullByExpression() {
		Query query = new Query();
		query.eq("state", 0);
		
		TUser user = new TUser();
		user.setRemark("批量修改备注");
		
		int i = dao.updateIgnoreNullByExpression(user, query);
		print("testUpdateNotNullByExpression --> " + i);
	}
	
	// 删除
	@Test
	public void testDel() {
		TUser user = new TUser();
		user.setId(14);
		int i = dao.del(user);
		print("del --> " + i);
	}
	
	// 根据条件删除
	// DELETE FROM `t_user` WHERE state = ? 
	@Test
	public void delByExpression() {
		Query query = new Query();
		query.eq("state", 3);
		int i = dao.delByExpression(query);
		print("delByExpression --> " + i);
	}
	
}
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简介

一个mybatis增强类库,目标为让mybatis开发更简单。 展开 收起
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