MybatisPlus 实现数据拦截

基于配置文件实现（关键key存储在配置文件，通过读取配置文件来实现动态拼接sql）

1、创建注解类

@UserDataPermission(id="app")

注：id用以区分是小程序还是应用程序

注解加的位置：

2、配置枚举类配置文件 EDataPermissionType

 

3、创建拦截器重写InnerInterceptor接口，重写查询方法

/**
 * 拦截器
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = true)
public class MyDataPermissionInterceptor extends JsqlParserSupport implements InnerInterceptor {
    /**
     * 数据权限处理器
     */
    private MyDataPermissionHandler dataPermissionHandler;
 
    @Override
    public void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {
        if (InterceptorIgnoreHelper.willIgnoreDataPermission(ms.getId())) {
            return;
        }
        PluginUtils.MPBoundSql mpBs = PluginUtils.mpBoundSql(boundSql);
        mpBs.sql(this.parserSingle(mpBs.sql(), ms.getId()));
    }
 
    @Override
    protected void processSelect(Select select, int index, String sql, Object obj) {
        SelectBody selectBody = select.getSelectBody();
        if (selectBody instanceof PlainSelect) {
            this.setWhere((PlainSelect) selectBody, (String) obj);
        } else if (selectBody instanceof SetOperationList) {
            SetOperationList setOperationList = (SetOperationList) selectBody;
            List selectBodyList = setOperationList.getSelects();
            selectBodyList.forEach(s -> this.setWhere((PlainSelect) s, (String) obj));
        }
    }
 /**
     * 设置 where 条件
     *
     * @param plainSelect  查询对象
     * @param whereSegment 查询条件片段
     */
    private void setWhere(PlainSelect plainSelect, String whereSegment) {
 
        Expression sqlSegment = this.dataPermissionHandler.getSqlSegment(plainSelect, whereSegment);
        if (null != sqlSegment) {
            plainSelect.setWhere(sqlSegment);
        }
    }
}

4、创建处理类，动态拼接sql片段，设置where

/**
 * 拦截器处理器
 */
@Slf4j
public class MyDataPermissionHandler {
    private ISysUserDataRelationService sysUserDataRelationService = new SysUserDataRelationServiceImpl();
    private MpcTokenUtil mpcTokenUtil = new MpcTokenUtil();
    private AppManageConfig appManageConfig;
 
    /**
     * 获取数据权限 SQL 片段
     *
     * @param plainSelect  查询对象
     * @param whereSegment 查询条件片段
     * @return JSqlParser 条件表达式
     */
    @SneakyThrows(Exception.class)
    public Expression getSqlSegment(PlainSelect plainSelect, String whereSegment) {
        sysUserDataRelationService = SpringUtils.getBean(ISysUserDataRelationService.class);
        mpcTokenUtil = SpringUtils.getBean(MpcTokenUtil.class);
        appManageConfig = SpringUtils.getBean(AppManageConfig.class);
        // 待执行 SQL Where 条件表达式
        Expression where = plainSelect.getWhere();
        if (where == null) {
            where = new HexValue(" 1 = 1 ");
        }
        //获取mapper名称
        String className = whereSegment.substring(0, whereSegment.lastIndexOf("."));
        //获取方法名
        String methodName = whereSegment.substring(whereSegment.lastIndexOf(".") + 1);
        Table fromItem = (Table) plainSelect.getFromItem();
        // 有别名用别名，无别名用表名，防止字段冲突报错
        Alias fromItemAlias = fromItem.getAlias();
        String mainTableName = fromItemAlias == null ? fromItem.getName() : fromItemAlias.getName();
        //获取当前mapper 的方法
        Method[] methods = Class.forName(className).getMethods();
        //遍历判断mapper 的所有方法，判断方法上是否有 UserDataPermission
        for (Method m : methods) {
            if (Objects.equals(m.getName(), methodName)) {
                UserDataPermission annotation = m.getAnnotation(UserDataPermission.class);
                if (annotation == null) {
                    return where;
                }
                String type = annotation.id();
                //小程序或应用程序的集合，in的范围
                List dataIds = sysUserDataRelationService.getUserPermission(mpcTokenUtil.getUserAccountByToken(), EDataPermissionType.getCode(type));
                if (CollectionUtils.isEmpty(dataIds)) {
                    return null;
                }
                log.info("开始进行权限过滤,where: {},mappedStatementId: {}", where, whereSegment);
                // 把集合转变为JSQLParser需要的元素列表
                ItemsList ids = new ExpressionList(dataIds.stream().map(StringValue::new).collect(Collectors.toList()));
                //in表达式的写法
                InExpression inExpressiondept = null;
                String key = appManageConfig.getList().get(type);
                inExpressiondept = new InExpression(new Column(mainTableName + "." + key), ids);
                return new AndExpression(where, inExpressiondept);
                
            }
        }
        //说明无权查看，
        where = new HexValue(" 1 = 2 ");
        return where;
    }
 
}

5、将拦截器加到mybatis-plus插件中

@Configuration
@MapperScan("com.shinho.mpc.mapper")
public class MybatisPlusConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
 
    /**
     * 将拦截器加到mybatis插件中
     * @return
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        // 添加数据权限插件
        MyDataPermissionInterceptor dataPermissionInterceptor = new MyDataPermissionInterceptor();
        // 添加自定义的数据权限处理器
        dataPermissionInterceptor.setDataPermissionHandler(new MyDataPermissionHandler());
        interceptor.addInnerInterceptor(dataPermissionInterceptor);
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }
 
}

6、使用的位置加注解即可生效

在mapper层加上注解：

@UserDataPermission(id="app")

id ：注解入参

app：应用程序类型权限控制

mp：小程序类型权限控制

7、数据拦截效果：