MybatisPlus只取一条记录的两种方法实现

@Override
public T selectOne(Wrapper<T> wrapper){
    return SqlHelper.getObject(baseMapper.selectList(wrapper));
}

T getOne(Wrapper<T> queryWrapper,boolean throwEx){
    return throwEx?this.baseMapper.selectOne(queryWrapper):SqlHelper.getObject(this.log,this.baseMapper.selectList(queryWrapper));
}

SELECT 
	colum1,colum2,colum3 
FROM 
	table1 
WHERE 
	条件 
LIMIT 1

public Children last(boolean condition, String lastSql) {
        if (condition) {
            this.lastSql.setStringValue(" " + lastSql);
        }

        return this.typedThis;
}

xxService.selectOne(new EntityWrapper().eq().eq().last("limit 1"));

xxService.selectOne(new QueryWrapper().eq().eq().last("limit 1"));

public interface xxxService extends IService<xxx>{
    /**
     * 仅有一条数据
     * @param wrapper
     * @return
     */
    default xxx getOnly(EntityWrapper<xxx> wrapper){
        wrapper.last("limit 1");
        return this.selectOne(wrapper);
    };
}

public interface xxxService extends IService<xxx>{
    /**
     * 仅有一条数据
     * @param wrapper
     * @return
     */
    default xxx getOnly(QueryWrapper<xxx> wrapper){
        wrapper.last("limit 1");
        return this.getOne(wrapper);
    };
}