blocks|key|292277|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|292278|有没有人能给我推荐一个资源，深入了解在使用Spring+DATA+JPA时到底发生了什么？|blockquote|292279|292280|292281|这类信息的权威来源是source。让我带你去一些名胜古迹。|offset|length|292282|基本上会发生以下情况：|292283|292284|find+and+extract+the+query+from+the+annotation.|ordered-list-item|292285|possibly+create+a+count+query+from+that.|292286|replace+spell+expression+with+parameters.|292287|add+ordering+if+applicable.|292288|prepare+the+query+with+the+EntityManager.|style|CODE|292289|register+parameters.|292290|add+pagination+limits.|292291|execute+the+query.|292292|transform+result.|292293|292294|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/spring-projects/spring-data-jpa|1|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryMethod.java#L257|2|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L67|3|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/QueryParameterSetterFactory.java#L127|4|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L83|5|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java#L225|6|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L92|7|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java#L632|8|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java#L88|9|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java#L104^0|0|0|0|0|A|6|0|0|0|0|0|1A|1|0|0|13|2|0|0|14|3|0|0|Q|4|0|R|D|0|14|5|0|0|J|6|0|0|L|7|0|0|H|8|0|0|G|9|0|0^^$0|@$1|2|3|-4|4|5|6|1Y|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|1Z|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|20|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|21|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|22|7|@]|8|@$H|23|I|24|1|25]]|9|$]]|$1|J|3|K|4|5|6|26|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|27|7|@]|8|@]|9|$]]|$1|M|3|N|4|O|6|28|7|@]|8|@$H|29|I|2A|1|2B]]|9|$]]|$1|P|3|Q|4|O|6|2C|7|@]|8|@$H|2D|I|2E|1|2F]]|9|$]]|$1|R|3|S|4|O|6|2G|7|@]|8|@$H|2H|I|2I|1|2J]]|9|$]]|$1|T|3|U|4|O|6|2K|7|@]|8|@$H|2L|I|2M|1|2N]]|9|$]]|$1|V|3|W|4|O|6|2O|7|@$H|2P|I|2Q|X|Y]]|8|@$H|2R|I|2S|1|2T]]|9|$]]|$1|Z|3|10|4|O|6|2U|7|@]|8|@$H|2V|I|2W|1|2X]]|9|$]]|$1|11|3|12|4|O|6|2Y|7|@]|8|@$H|2Z|I|30|1|31]]|9|$]]|$1|13|3|14|4|O|6|32|7|@]|8|@$H|33|I|34|1|35]]|9|$]]|$1|15|3|16|4|O|6|36|7|@]|8|@$H|37|I|38|1|39]]|9|$]]|$1|17|3|-4|4|5|6|3A|7|@]|8|@]|9|$]]|$1|18|3|-4|4|5|6|3B|7|@]|8|@]|9|$]]]|19|$1A|$4|1B|1C|1D|9|$1E|1F]]|1G|$4|1B|1C|1D|9|$1E|1H]]|1I|$4|1B|1C|1D|9|$1E|1J]]|1K|$4|1B|1C|1D|9|$1E|1L]]|1M|$4|1B|1C|1D|9|$1E|1N]]|1O|$4|1B|1C|1D|9|$1E|1P]]|1Q|$4|1B|1C|1D|9|$1E|1R]]|1S|$4|1B|1C|1D|9|$1E|1T]]|1U|$4|1B|1C|1D|9|$1E|1V]]|1W|$4|1B|1C|1D|9|$1E|1X]]]]

<blockquote>
 Can anyone point me to a resource which goes in depth on what exactly happens under the hood when using Spring [DATA] JPA?
</blockquote>

The authoritative source for this kind of information is the <a href="https://github.com/spring-projects/spring-data-jpa" rel="nofollow noreferrer">source</a>.
Let me point you to some places of interest.

Basically the following happens:

<ol>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryMethod.java#L257" rel="nofollow noreferrer">find and extract the query from the annotation</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L67" rel="nofollow noreferrer">possibly create a count query from that</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/QueryParameterSetterFactory.java#L127" rel="nofollow noreferrer">replace spell expression with parameters</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L83" rel="nofollow noreferrer">add ordering if applicable</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractJpaQuery.java#L225" rel="nofollow noreferrer">prepare the query with the <code>EntityManager</code></a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/AbstractStringBasedJpaQuery.java#L92" rel="nofollow noreferrer">register parameters</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java#L632" rel="nofollow noreferrer">add pagination limits</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java#L88" rel="nofollow noreferrer">execute the query</a>.</li>
<li><a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java#L104" rel="nofollow noreferrer">transform result</a>.</li>
</ol>

blocks|key|3664466|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3664467|输出日志，用于查看|ordered-list-item|3664468|实际生成和执行的SQL查询|3664469|例如，在application.properties中|offset|length|style|CODE|3664470|logging.level.org.springframework.data.jpa=debug
logging.level.org.hibernate=debug|code-block|syntax|javascript|3664471|SpringBoot+log+reference|3664472|3664473|在这里检查spring-data-jpa的源代码：|3664474|3664475|https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java|3664476|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-custom-log-levels|1^0|0|0|0|4|M|0|0|0|O|0|0|0|0|0|0|41|1|0^^$0|@$1|2|3|-4|4|5|6|17|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|18|7|@]|8|@]|9|$]]|$1|D|3|E|4|5|6|19|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|1A|7|@$H|1B|I|1C|J|K]]|8|@]|9|$]]|$1|L|3|M|4|N|6|1D|7|@]|8|@]|9|$O|P]]|$1|Q|3|R|4|5|6|1E|7|@]|8|@$H|1F|I|1G|1|1H]]|9|$]]|$1|S|3|-4|4|5|6|1I|7|@]|8|@]|9|$]]|$1|T|3|U|4|C|6|1J|7|@]|8|@]|9|$]]|$1|V|3|-4|4|5|6|1K|7|@]|8|@]|9|$]]|$1|W|3|X|4|5|6|1L|7|@]|8|@$H|1M|I|1N|1|1O]]|9|$]]|$1|Y|3|-4|4|5|6|1P|7|@]|8|@]|9|$]]]|Z|$10|$4|11|12|13|9|$14|15]]|16|$4|11|12|13|9|$14|X]]]]

<ol>
<li>Output log to view what SQL query really generated and executed</li>
</ol>

For example, in <code>application.properties</code>:

<pre><code>logging.level.org.springframework.data.jpa=debug
logging.level.org.hibernate=debug
</code></pre>

<a href="https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-custom-log-levels" rel="nofollow noreferrer">SpringBoot log reference</a>

<ol start="2">
<li>Check the source code of spring-data-jpa here:</li>
</ol>

<a href="https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java" rel="nofollow noreferrer">https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/query/JpaQueryExecution.java</a>

I want to learn more about Spring JPA and what happens under the hood when a native JPA query (using PostgreSQL) is defined and called in a Repository class. I have tried searching online but all posts are related to defining and using native queries.

I am more interested to learn about what happens when my SpringBoot application calls a method that is annotated with @Query. I am mainly looking into this to try and understand the performance of executing such a query within Java.

Can anyone point me to a resource which goes in depth on what exactly happens under the hood when using Spring JPA?

Understanding Spring JPA native query under the hood

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想了解更多关于Spring JPA的知识，以及在Repository类中定义和调用原生JPA查询(使用PostgreSQL)时会发生什么。我尝试过在线搜索，但所有的帖子都与定义和使用原生查询有关。我更感兴趣的是了解当我的SpringBoot应用程序调用带有@Query注释的方法时会发生什么。我主要研究这一点，以尝试并理解在Java中执行这样的查询的性能。有没有人能给我推荐一个资源，深入了解在使用

问在幕后理解Spring JPA本机查询
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