如果实现了 通用的 Service 会出现 同时找到多个 mapper

[pzzzzzzzzzzz]

No qualifying bean of type 'tk.mybatis.mapper.common.Mapper<?>' available: expected single matching bean but found 3

异常如上。 通用Service 如下： @Service public abstract class AbsBaseService<T> implements BaseService<T> {

@Resource 
protected Mapper<T> mapper;

//根据id查询实体
public T queryById(String id){
    return this.mapper.selectByPrimaryKey(id);
}

//查询所有
public List<T> queryAll(){
    return this.mapper.select(null);
}

//条件查询
public List<T> queryListByWhere(T param){
    return this.mapper.select(param);
}

//查询记录数
public Integer queryCount(T param){
    return this.mapper.selectCount(param);
}

//分页
public PageInfo<T> queryListByWhere(T param, Integer page, Integer rows){
    PageHelper.startPage(page, rows);
    List<T> list = this.queryListByWhere(param);
    return new PageInfo<>(list);

}

//查询一条记录
public T queryOne(T param){
    return this.mapper.selectOne(param);
}

//插入
public Integer save(T param){
    return this.mapper.insert(param);
}

//新增非空字段
public Integer saveSelect(T param){
    return this.mapper.insertSelective(param);
}

//根据主键更新
public Integer update(T param){
    return this.mapper.updateByPrimaryKey(param);
}

//根据主键更新非空字段
public Integer updateSelective(T param){
    return this.mapper.updateByPrimaryKeySelective(param);
}

//根据主键删除
public Integer deleteById(String id){
    return this.mapper.deleteByPrimaryKey(id);
}

//批量删除
public Integer deleteByIds(Class<T> clazz,List<Object> values){
    Example example = new Example(clazz);
    example.createCriteria().andIn("id", values);
    return this.mapper.deleteByExample(example);
}

}

[pzzzzzzzzzzz]

解决办法： 通用的Service： public abstract class AbsBaseService<T> implements BaseService<T> {

private Mapper<T> mapper;

public void setMapper(Mapper<T> mapper) {
    this.mapper= mapper;
}

实现的Service： @Resource private UsersMapper usersMapper;

@Autowired
public void setUsersMapper(){
    super.setMapper(usersMapper);
}

[abel533]

不必这样，出错的原因是你注解用错了。

泛型注入时，必须使用 @Autowired。

直接：

@Service
public abstract class AbsBaseService implements BaseService {

@Autowired
protected Mapper<T> mapper;

[Jacob-W]

@abel533 按照你这样写的，还是报以下错误： Field mapper in com.didi.commons.utils.BaseService required a bean of type 'tk.mybatis.mapper.common.Mapper' that could not be found.

@Service public abstract class BaseService<T, ID> {

@Autowired
private Mapper<T> mapper;

[abel533]

参考guozilanTK: https://github.com/guozilanTK/base/blob/master/base-service/src/main/java/tk/guozilan/base/service/AbstractService.java

[crisLotus]

@Jacob-W 请问“Field mapper in com.didi.commons.utils.BaseService required a bean of type 'tk.mybatis.mapper.common.Mapper' that could not be found.”您的这个问题解决了吗？ 求教，谢谢！