开发xml SQL 的相关内容

阿里云文档 2025-08-14

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本文介绍如何在阿里云EMR Serverless Spark环境中开发SparkSQL任务，并指导您如何访问Spark UI以查看任务详情。

阿里云文档 2025-04-16

如何创建SelectDB集群

云数据库 SelectDB 版通过集群粒度实现算力隔离，多个集群可以分别用于不同的工作负载（例如读写数据），以满足各个业务的不同性能规模和使用时长需求。本文介绍如何在云数据库 SelectDB 版实例中新建集群。

阿里云文档 2025-02-25

SparkSQL任务快速入门

EMR Serverless Spark支持通过SQL代码编辑和运行任务。本文带您快速体验SQL的创建、启动和运维等操作。

阿里云文档 2024-10-18

配置NL2SQL服务

查询分析服务中的NL2SQL提供将自然语言查询转换为SQL语句的能力，本文介绍如何配置查询分析-NL2SQL服务。

阿里云文档 2024-07-17

Flink SQL开发调优实践

说明实时计算Flink版控制台界面和功能可能会发生变化，具体请以实际控制台为准。

文章 2024-06-24 来自：开发者社区

后端数据库开发高级之通过在xml文件中映射实现动态SQL

if where标签一个非常重要的功能随着用户的输入或者是外部条件的变化而改变的SQL语句我们称为SQL语句只有传形参的有值其他的属性都是null 所以并没有查询到数据我们...

文章 2024-06-24 来自：开发者社区

后端数据库开发JDBC编程Mybatis之用基于XML文件的方式映射SQL语句实操

之前的SQL语句是基于注解以后开发中一般是一个接口对应一个映射文件 ...

问答 2022-02-15 来自：开发者社区

[@小川游鱼][¥20]利用微服务全家桶进行开发，那么在用到mybatis时，是用mapper中的xml写sql语句的方式好还是用第三方库利用代码写比较好？用xml中sql写的话感觉难维护，但可以提高对sql本身进行优化和跨表查询；用第三方库的话比较好维护，但牵涉到跨表查询的时候可能要多条语句这样会导致性能变差

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