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SpringBoot整合MybatisSQL过滤@Intercepts的实现

作者:曾规则

这篇文章主要介绍了SpringBoot整合MybatisSQL过滤@Intercepts的实现,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

场景:

系统模块查询数据库需要根据用户的id去筛选数据。那么如果在 每个sql加user_id的过滤显然不明确。所以要在查询前将sql拼接上条件,做统一管理。

开发环境:

spring boot + mybatis

只需一个拦截类即可搞定(在看代码前需要了解注解@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......");
//    获取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);

//    判断sql是否有where条件。改变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;
 }
// 继续执行
 Object result = invocation.proceed();
 return result;
  }

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

  @Override
  public void setProperties(Properties properties) {

  }

  // 复制原始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;
 }
  }

}

这样重启访问即可发现每次查询都会走这边!

到此这篇关于SpringBoot整合MybatisSQL过滤@Intercepts的实现的文章就介绍到这了,更多相关SpringBoot MybatisSQL过滤@Intercepts内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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