tk.Mybatis 扩展通用mapper接口

tk.Mybatis 扩展通用mapper

前文提要

《spring boot 整合 tk.Mybatis 》
《tk.mybatis官方手册》

引言

tk.mybatis项目中提供了大量现成的方法，这些方法可以作为扩展时的参考。

例如 tk.mybatis.mapper.common.ids 包中的 批量删除接口DeleteByIdsMapper

@RegisterMapper
public interface DeleteByIdsMapper<T> {
    @DeleteProvider(
        type = IdsProvider.class,
        method = "dynamicSQL"
    )
    int deleteByIds(String var1);
}

SQL模版生产者IdsProvider.class的源码如下,继承了MapperTemplate模版接口

public class IdsProvider extends MapperTemplate {
    public IdsProvider(Class<?> mapperClass, MapperHelper mapperHelper) {
        super(mapperClass, mapperHelper);
    }

    public String deleteByIds(MappedStatement ms) {
        Class<?> entityClass = this.getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        sql.append(SqlHelper.deleteFromTable(entityClass, this.tableName(entityClass)));
        Set<EntityColumn> columnList = EntityHelper.getPKColumns(entityClass);
        if (columnList.size() == 1) {
            EntityColumn column = (EntityColumn)columnList.iterator().next();
            sql.append(" where ");
            sql.append(column.getColumn());
            sql.append(" in (${_parameter})");
            return sql.toString();
        } else {
            throw new MapperException("继承 deleteByIds 方法的实体类[" + entityClass.getCanonicalName() + "]中必须只有一个带有 @Id 注解的字段");
        }
    }
	... ... //省略

上面的代码实际上就是对sql语句的拼接，由此可得我们只需要创建一个mappr接口，然后再创建一个provider继承MapperTemplate模版接口即可
更多template的功能可以参考这篇博客 《基于tk.mybatis扩展自己的通用mapper》

扩展通用mapper

创建自定义接口：DletetByCodesMapper

注意，这个类不能被MapperScan 扫描到，否则会报错

@RegisterMapper
public interface DletetByCodesMapper<T> {
    @DeleteProvider(
            type = IdsProviderExt.class,
            method = "dynamicSQL"
    )
    int deleteByCodes(String[] arr);
}

创建自定义模版：IdsProviderExt

由于我的数据主键是UUID，所以依据IdsProvider进行了扩展

public class IdsProviderExt extends MapperTemplate {

    public IdsProviderExt(Class<?> mapperClass, MapperHelper mapperHelper) {
        super(mapperClass, mapperHelper);
    }

    public String deleteByCodes(MappedStatement ms) {
        Class<?> entityClass = this.getEntityClass(ms);
        StringBuilder sql = new StringBuilder();
        sql.append(SqlHelper.deleteFromTable(entityClass, this.tableName(entityClass)));
        Set<EntityColumn> columnList = EntityHelper.getPKColumns(entityClass);
        if (columnList.size() == 1) {
            EntityColumn column = (EntityColumn)columnList.iterator().next();
            sql.append(" where ");
           // 不指定@Parm的话，数组参数默认使用array接收
            sql.append("");
            sql.append(column.getColumn() + "= #{code}");
            sql.append("");
            return sql.toString();
        } else {
            throw new MapperException("继承 deleteByIds 方法的实体类[" + entityClass.getCanonicalName() + "]中必须只有一个带有 @Id 注解的字段");
        }
    }
}

创建MyMapper继承扩展模版

/**
 * tkMybatis 的 BaseMapper
 * 特别注意，该接口不能被扫描到，否则会出错
 */
public interface MyMapper extends Mapper, MySqlMapper , DeleteByIdsMapper, DletetByCodesMapper {
}

generator逆向工程生成 TbSysUserMapper 和XML

TbSysUserMapper 继承了MyMapper接口，所以也就继承了扩展接口

public interface TbSysUserMapper extends MyMapper<TbSysUser> {
}

<mapper namespace="com.funtl.itoken.common.mapper.TbSysUserMapper">
  <resultMap id="BaseResultMap" type="com.funtl.itoken.common.domain.entity.TbSysUser">
    
    <id column="user_code" jdbcType="VARCHAR" property="userCode" />
    <result column="login_code" jdbcType="VARCHAR" property="loginCode" />
    <result column="user_name" jdbcType="VARCHAR" property="userName" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="email" jdbcType="VARCHAR" property="email" />
    <result column="mobile" jdbcType="VARCHAR" property="mobile" />
    <result column="phone" jdbcType="VARCHAR" property="phone" />
	

创建Spring Boot启动类

@MapperScan(basePackages = {"com.funtl.itoken.common.mapper","com.funtl.itoken.service.admin.mapper"})//dao路径
public class ServiceAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(ServiceAdminApplication.class,args);
    }
}

Junit Test 测试代码

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ServiceAdminApplication.class)
@Transactional
public class MyBatisTests{
	
    /**
     * 注入数据查询接口
     */
    @Autowired
    private TbSysUserMapper tbUserMapper;
   /**
     * 测试批量删除
     */
    @Test
    @Rollback
    public void deleteByCodes() {
        String[] codes = {"5bb38bf6-2378-431c-88cb-7a38b69df806","c04471e1-fa3b-4d6e-ba98-e806dc5ad07c"};
        int i = tbUserMapper.deleteByCodes(codes);
        info("删除数量："+i);//这个是我的自定义函数，自行打印即可
    }
}

结果