<!--通用mapper起步依賴-->
<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.0.4</version>
</dependency>

<!--每個(gè)工程都有Pojo，都需要用到該包對(duì)應(yīng)的注解-->
<dependency>
    <groupId>javax.persistence</groupId>
    <artifactId>persistence-api</artifactId>
    <version>1.0</version>
    <scope>compile</scope>
</dependency>

@SpringBootApplication
@MapperScan(basePackages = {"com.tom.order.mapper"})
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
}

import tk.mybatis.mapper.common.Mapper;
 
@Repository
public interface BrandMapper extends Mapper<Brand> {
}

 
import tk.mybatis.mapper.common.Mapper;
 
/**
 * DAO 使用通用Mapper
 * DSO接口需要繼承 tk.mybatis.mapper.common.Mapper
 */
@Repository
public interface BrandMapper extends Mapper<Brand> {
 
 
}

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import tk.mybatis.mapper.entity.Example;
 
import java.util.List;
 
@Service
public class BrandServiceImpl implements BrandService {
 
    @Autowired
    private BrandMapper brandMapper;
 
    public Example createExample(Brand brand) {
        // 自定義條件搜索對(duì)象 Example
        Example example = new Example(Brand.class);
        Example.Criteria criteria = example.createCriteria(); //條件構(gòu)造器
 
        if (brand != null) {
            if (!StringUtils.isEmpty(brand.getName())) {
                criteria.andLike("name", '%' + brand.getName() + '%');
            }
 
            if (!StringUtils.isEmpty(brand.getLetter())) {
                criteria.andEqualTo("letter", brand.getLetter());
            }
        }
        return example;
    }
 
    @Override
    public List<Brand> findAll() {
        return brandMapper.selectAll();
    }
 
    @Override
    public List<Brand> findList(Brand brand) {
        Example example = createExample(brand);
        return brandMapper.selectByExample(example);
    }
 
    @Override
    public Brand findById(Integer id) {
        return brandMapper.selectByPrimaryKey(id);
    }
 
    /**
     * 分頁(yè)查詢
     * @param page  當(dāng)前頁(yè)
     * @param size  每頁(yè)顯示的條數(shù)
     * @return
     */
    @Override
    public PageInfo<Brand> pageSearch(Integer page, Integer size) {
        // 分頁(yè)實(shí)現(xiàn)
        // 后面的查詢必須是緊跟集合查詢
        PageHelper.startPage(page, size);
        // 查詢集合
        List<Brand> brands = brandMapper.selectAll();
        return new PageInfo<Brand>(brands);
    }
 
    @Override
    public PageInfo<Brand> pageSearchAndCondition(Brand brand, Integer page, Integer size) {
        // 開始分頁(yè)
        PageHelper.startPage(page, size);
        // 搜索數(shù)據(jù)
        Example example = createExample(brand);
        List<Brand> list = brandMapper.selectByExample(example);
        return new PageInfo<Brand>(list);
    }
 
    /**
     * 增加品牌
     * @param brand
     */
    @Override
    public void add(Brand brand) {
        // 使用通用 Mapper.insertSelective
        // 方法中但凡帶有selective就會(huì)忽略空值
        int i = brandMapper.insertSelective(brand);
    }
 
    /**
     * 根據(jù)id修改品牌
     * @param brand
     */
    @Override
    public void update(Brand brand) {
        // 使用通用mapper.update();
        brandMapper.updateByPrimaryKeySelective(brand);
    }
 
    /**
     * 根據(jù)id刪除
     * @param id
     */
    @Override
    public void del(Integer id) {
        brandMapper.deleteByPrimaryKey(id);
    }
}

public interface BaseMapper<T> extends tk.mybatis.mapper.common.BaseMapper<T>, IdsMapper<T>, MySqlMapper<T>, OracleMapper<T> {
}

pom.xml引入
<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.1.5</version>
</dependency>