> For the complete documentation index, see [llms.txt](https://query.docs.doyto.win/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://query.docs.doyto.win/basic/association-service.md).

# Intermediate Table

### Table Structure

```sql
create table t_user_and_role (user_id bigint, role_id int);
```

### Bead Declaration

```java
@Bean
public AssociativeService<Long, Integer> userAndRoleAssociativeService() {
    return new TemplateAssociativeService<>("t_user_and_role", "userId", "roleId");
}
```

### Usage

Create a web api to invoke the `userAndRoleAssociativeService`:

```java
@RestController
class AuthController {
    @Resource
    AssociativeService<Long, Integer> userAndRoleAssociativeService;

    @GetPostMapping("reallocateRolesForUser")
    public void reallocateRoles(Long userId, @RequestParam List<Integer> roleIds) {
        userAndRoleAssociativeService.reallocateForLeft(userId, roleIds);
    }
}
```

### Access

Invoking this api will execute the following SQL statement

```sql
DELETE FROM t_user_and_role WHERE userId = ?;
INSERT INTO t_user_and_role (userId, roleId) values (?, ?)[, (?, ?)];
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://query.docs.doyto.win/basic/association-service.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.