Mapper.select(record) 根据实体中的属性值进行查询,查询条件使用等号 Mapper.selectAll() 查询全部结果 Mapper.selectByExample(example) 根据Example条件进行查询 Mapper.selectByPrimaryKey(key) 根据主键字段进行查询,方法参数必须包含完整的主键属性,查询条件使用等号 Mapper.selectCount(record) 根据实体中的属性查询总数...
UserMapper.countByExample(example); //等同于:select count(*) from user where id='1001' 2.查询: (1)主键查询:selectByPrimaryKey User user = UserMapper.selectByPrimaryKey("1001"); //等同于:select * from user where id = "1001" (2)条件查询:selectByExample (and条件) Example example = new...
<selectid="selectByExampleWithBLOBs"parameterType="com.pojo.TbItemParamExample"resultMap="ResultMapWithBLOBs"> 1. 到这里发现他们的返回值不同。 <resultMapid="BaseResultMap"type="com.pojo.TbItemParam"><!-- WARNING - @mbg.generated This element is automatically generated by MyBatis Generator, do not ...
User user = UserMapper.selectByPrimaryKey("1001"); 等同于:select * from user where id = "1001" 1. 2. (2)selectByExample (and条件) Example example = new Example(User.class); example.createCriteria().andEqualTo("id", "1001" ) .andEqualTo("userName", "小李"); User user = UserMapp...
int deleteByPrimaryKey(Integer id) thorws SQLException 按主键删除 int deleteByExample(UserExample example) thorws SQLException 按条件删除 String/Integer insert(User record) thorws SQLException 插入数据(返回值为ID) User selectByPrimaryKey(Integer id) thorws SQLException ...
类似于:select count(*) from user 五、where条件查询或多条件查询 example.setOrderByClause("age asc");//升序 example.setDistinct(false);//不去重 if(!StringUtils.isNotBlank(user.getName())){ Criteria.andNameEqualTo(user.getName());
selectByExample(example); 类似于:select * from user where name={#user.name} and sex={#user.sex} order by age asc; UserExample.Criteria criteria1 = example.createCriteria(); UserExample.Criteria criteria2 = example.createCriteria(); if(!StringUtils.isNotBlank(user.getName())){ Criteria1....
example.setOrderByClause (” id desc, countryname asc”); //设置是否 distinct 去重 example.setDistinct(true); //创建条件 CountryExample.Criteria criteria= example.createCriteria(); //id >= 1 criteria.andidGreaterThanOrEqualTo(l); //id< 4 ...
1.selectByPrimaryKey() User user = XxxMapper.selectByPrimaryKey(100);//相当于select * from user where id = 100 2.selectByExample() 和 selectByExampleWithBLOGs() UserExample example =newUserExample(); Criteria criteria = example.createCriteria(); criteria.andUsernameEqualTo("wyw"); criteria....
delete by primary key delete by example (using a dynamic where clause) select by primary key select by example (using a dynamic where clause) count by example 具体参考:http://mybatis.org/generator/index.html mybatis自动生成example的使用 ...