mybatis拦截器怎么实现通用权限字段添加功能

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实现效果

日常sql中直接使用权限字段实现权限内数据筛选，无需入参，直接使用，使用形式为：

select * from crh_snp.channelinfo where short_code in (${commonEnBranchNo})

注意事项说明

1、添加插件若使用xml形式mybatis可在配置文件中plugins标签中添加，本项目实际使用的为注解形式mybatis，需要通过SqlSessionFactoryBean代码方式添加或者SqlSessionFactoryBean的xml配置形式，代码在jar包中无法操作，只能使用xml配置形式，故需要覆盖SqlSessionFactoryBean配置

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  <property name="dataSource" ref="dataSource" />  <property name="mapperLocations">   <list>     <value>classpath*:xmlmapper/*.xml</value>     <value>classpath*:resources/xmlmapper/*.xml</value>   </list>  </property>  <property name="plugins">   <array>     <bean class="com.cairh.xpe.snp.backend.interceptor.MybatisInterceptor"/>   </array>  </property></bean>

2、jdbc的jar包中配置了sqlSessionFactory，本项目中配置进行覆盖，注意spring中同名类后加载的会覆盖先加载的类，需要保证本项目配置的类后加载。spring配置文件扫描会先加载本工程项目bean，可通过新增额外的配置文件放在原配置文件后实现后加载，如

<context-param>  <param-name>contextConfigLocation</param-name>  <param-value>   classpath*:spring-beans.xml   classpath*:spring-person.xml  </param-value></context-param>

3、注意添加的参数需要${}形式使用，#{}会经过预编译获取到的sql参数为问号，无法直接替换

拦截器实现类

@Intercepts({  @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})})public class MybatisInterceptor implements Interceptor {//  private Logger logger = LoggerFactory.getLogger(getClass());  @Override  public Object intercept(Invocation invocation) throws Throwable {    if (invocation.getTarget() instanceof Executor && invocation.getArgs().length==4) {      String sql = getSqlByInvocation(invocation);      //将操作员可操作的渠道、用户id及营业部作通用字段放到sql中统一解析      if(sql.contains("commonEnShortCode")){        sql = addPremissionParam(sql);        resetSql2Invocation(invocation, sql);      }    }    return invocation.proceed();  }  @Override  public Object plugin(Object target) {    return Plugin.wrap(target, this);  }  @Override  public void setProperties(Properties properties) {}  /**   * 通用权限字段添加，目前支持：commonEnShortCode、commonEnBrokerUserId、commonEnBranchNo   * @param sql   * @return   */  private String addPremissionParam(String sql) {    CrhUser crhUser = (CrhUser) RequestUtil.getRequest().getAttribute(CrhUser.CRH_USER_SESSION);    BackendRoleServiceImpl backendRoleService = (BackendRoleServiceImpl)SpringContext.getBean("backendRoleServiceImpl");    if(sql.contains("commonEnBranchNo")){      List<String> enBranchNoList = backendRoleService.getEnBranchNo(crhUser.getUser_id());      String enBranchNoSql = "select to_char(column_value) from TABLE(SELECT F_TO_T_IN('"+ StringUtils.join(enBranchNoList,",")+"') FROM DUAL)";      sql = sql.replace("${commonEnBranchNo}", enBranchNoSql);    }    return sql;  }  /**   * 获取当前sql   * @param invocation   * @return   */  private String getSqlByInvocation(Invocation invocation) {    final Object[] args = invocation.getArgs();    MappedStatement ms = (MappedStatement) args[0];    Object parameterObject = args[1];    BoundSql boundSql = ms.getBoundSql(parameterObject);    return boundSql.getSql();  }  /**   * 将sql重新设置到invocation中   * @param invocation   * @param sql   * @throws SQLException   */  private void resetSql2Invocation(Invocation invocation, String sql) throws SQLException {    final Object[] args = invocation.getArgs();    MappedStatement statement = (MappedStatement) args[0];    Object parameterObject = args[1];    BoundSql boundSql = statement.getBoundSql(parameterObject);    MappedStatement newStatement = newMappedStatement(statement, new BoundSqlSource(boundSql));    MetaObject msObject = MetaObject.forObject(newStatement, new DefaultObjectFactory(), new DefaultObjectWrapperFactory(),new DefaultReflectorFactory());    msObject.setValue("sqlSource.boundSql.sql", sql);    args[0] = newStatement;  }  private MappedStatement newMappedStatement(MappedStatement ms, SqlSource newSqlSource) {    MappedStatement.Builder builder =        new MappedStatement.Builder(ms.getConfiguration(), ms.getId(), newSqlSource, ms.getSqlCommandType());    builder.resource(ms.getResource());    builder.fetchSize(ms.getFetchSize());    builder.statementType(ms.getStatementType());    builder.keyGenerator(ms.getKeyGenerator());    if (ms.getKeyProperties() != null && ms.getKeyProperties().length != 0) {      StringBuilder keyProperties = new StringBuilder();      for (String keyProperty : ms.getKeyProperties()) {        keyProperties.append(keyProperty).append(",");      }      keyProperties.delete(keyProperties.length() - 1, keyProperties.length());      builder.keyProperty(keyProperties.toString());    }    builder.timeout(ms.getTimeout());    builder.parameterMap(ms.getParameterMap());    builder.resultMaps(ms.getResultMaps());    builder.resultSetType(ms.getResultSetType());    builder.cache(ms.getCache());    builder.flushCacheRequired(ms.isFlushCacheRequired());    builder.useCache(ms.isUseCache());    return builder.build();  }}

public class BoundSqlSource implements SqlSource {  private BoundSql boundSql;  public BoundSqlSource(BoundSql boundSql) {    this.boundSql = boundSql;  }  @Override  public BoundSql getBoundSql(Object parameterObject) {    return boundSql;  }}

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