SpringBoot整合MybatisSQL過濾@Intercepts的實現(xiàn)

更新時間：2020年03月12日 09:19:13 作者：曾規(guī)則

這篇文章主要介紹了SpringBoot整合MybatisSQL過濾@Intercepts的實現(xiàn)，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

場景：

系統(tǒng)模塊查詢數(shù)據(jù)庫需要根據(jù)用戶的id去篩選數(shù)據(jù)。那么如果在每個sql加user_id的過濾顯然不明確。所以要在查詢前將sql拼接上條件，做統(tǒng)一管理。

開發(fā)環(huán)境：

spring boot + mybatis

只需一個攔截類即可搞定（在看代碼前需要了解注解@Intercepts()）：

@Component
@Intercepts({ @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class }) })
public class SqlInterceptor implements Interceptor {

  private Logger logger = LoggerFactory.getLogger(SqlInterceptor.class);

  @Override
  public Object intercept(Invocation invocation) throws Throwable {
 logger.info("Interceptor......");
//    獲取sql
 MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
 Object parameter = invocation.getArgs()[1];
 BoundSql boundSql = mappedStatement.getBoundSql(parameter);
 String oldsql = boundSql.getSql();
 logger.info("old:"+oldsql);

//    判斷sql是否有where條件。改變sql。
 boolean status = oldsql.toLowerCase().contains("where");

 if (status) {
   BoundSql newBoundSql = new BoundSql(mappedStatement.getConfiguration(), oldsql + " and 1=1",
       boundSql.getParameterMappings(), boundSql.getParameterObject());
   MappedStatement newMs = copyFromMappedStatement(mappedStatement, new BoundSqlSqlSource(newBoundSql));
   invocation.getArgs()[0] = newMs;
 }
// 繼續(xù)執(zhí)行
 Object result = invocation.proceed();
 return result;
  }

  @Override
  public Object plugin(Object target) {
 return Plugin.wrap(target, this);
  }

  @Override
  public void setProperties(Properties properties) {

  }

  // 復(fù)制原始MappedStatement
  private MappedStatement copyFromMappedStatement(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) {
   for (String keyProperty : ms.getKeyProperties()) {
     builder.keyProperty(keyProperty);
   }
 }
 builder.timeout(ms.getTimeout());
 builder.parameterMap(ms.getParameterMap());
 builder.resultMaps(ms.getResultMaps());
 builder.cache(ms.getCache());
 builder.useCache(ms.isUseCache());
 return builder.build();
  }

  public static class BoundSqlSqlSource implements SqlSource {
 BoundSql boundSql;

 public BoundSqlSqlSource(BoundSql boundSql) {
   this.boundSql = boundSql;
 }

 public BoundSql getBoundSql(Object parameterObject) {
   return boundSql;
 }
  }

}

這樣重啟訪問即可發(fā)現(xiàn)每次查詢都會走這邊！

到此這篇關(guān)于SpringBoot整合MybatisSQL過濾@Intercepts的實現(xiàn)的文章就介紹到這了,更多相關(guān)SpringBoot MybatisSQL過濾@Intercepts內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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