Mybatis-Plus实现动态表名sql解析器

在实现动态表名sql解析之前我们先配置动态表名的创建

动态表名的创建

配置mapper

1 public interface SysTestMapper extends BaseMapper<SysTest> {
2 
3     void createTable(@Param("tableName") String tableName);
4 
5 }

配置mapper.xml

 1 <mapper namespace="com.demo.studynew.mapper.SysTestMapper">
 2 
 3     <update id="createTable" parameterType="String">
 4         CREATE TABLE ${tableName} (
 5           `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
 6           `name` varchar(20) DEFAULT NULL,
 7           `gmt_create` datetime DEFAULT NULL,
 8           PRIMARY KEY (`id`)
 9         ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
10   </update>
11 
12 </mapper>

测试

1 @Test
2 void testCreateTable(){
3      sysTestMapper.createTable("sys_test_2019");
4 }

至此动态表名的创建配置完成。

动态表名sql解析

添加依赖

 1 <dependency>
 2    <groupId>com.baomidou</groupId>
 3     <artifactId>mybatis-plus-boot-starter</artifactId>
 4     <version>3.4.0</version>
 5 </dependency>
 6 
 7 <dependency>
 8     <groupId>mysql</groupId>
 9     <artifactId>mysql-connector-java</artifactId>
10 </dependency>

配置yml

 1 spring:
 2   servlet:
 3     multipart:
 4       max-file-size: 50MB
 5       max-request-size: 100MB
 6   datasource:
 7     username: root
 8     password: 123456
 9     url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF8&useSSL=false
10     driver-class-name: com.mysql.jdbc.Driver
11 file:
12   path: /Users/jisen/Desktop
13   folder: /files/
14 
15 ## mybatis-plus
16 mybatis-plus:
17   mapper-locations: classpath*:mapper/**/*.xml
18   configuration:
19     map-underscore-to-camel-case: true
20   global-config:
21     db-config:
22       update-strategy: ignored

编写sql解析器

 1 package com.demo.studynew;
 2 
 3 import com.baomidou.mybatisplus.annotation.DbType;
 4 import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
 5 import com.baomidou.mybatisplus.extension.plugins.handler.TableNameHandler;
 6 import com.baomidou.mybatisplus.extension.plugins.inner.DynamicTableNameInnerInterceptor;
 7 import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
 8 import org.mybatis.spring.annotation.MapperScan;
 9 import org.springframework.context.annotation.Bean;
10 import org.springframework.context.annotation.Configuration;
11 
12 import java.util.HashMap;
13 import java.util.Map;
14 
15 
16 @Configuration
17 @MapperScan("com.demo.studynew.**")
18 public class MybatisPlusConfig {
19 
20     public static ThreadLocal<String> TABLE_NAME = new ThreadLocal<String>();
21 
22     /**
23      * 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)
24      */
25     @Bean
26     public MybatisPlusInterceptor mybatisPlusInterceptor() {
27         MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
28         PaginationInnerInterceptor paginationInnerInterceptor = new PaginationInnerInterceptor(DbType.MYSQL);
29         interceptor.addInnerInterceptor(paginationInnerInterceptor);
30         DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
31         Map<String, TableNameHandler> tableNameHandlerMap = new HashMap<String, TableNameHandler>();
32         tableNameHandlerMap.put("sys_test", new TableNameHandler() {
33             @Override
34             public String dynamicTableName(String sql, String tableName) {
35                 return TABLE_NAME.get();
36             }
37         });
38         dynamicTableNameInnerInterceptor.setTableNameHandlerMap(tableNameHandlerMap);
39         interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
40         return interceptor;
41     }
42 }

测试

 1 package com.demo.studynew;
 2 
 3 import com.demo.studynew.entity.SysTest;
 4 import io.swagger.annotations.Api;
 5 import io.swagger.annotations.ApiOperation;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.web.bind.annotation.GetMapping;
 8 import org.springframework.web.bind.annotation.RestController;
 9 
10 import java.time.LocalDateTime;
11 import java.util.List;
12 
13 
14 @RestController
15 @Api(tags = "动态表名测试")
16 public class SysTestController {
17 
18     @Autowired
19     private SysTestMapper sysTestMapper;
20 
21     @GetMapping("list")
22     @ApiOperation("列表")
23     public List<SysTest> list() {
24         MybatisPlusConfig.TABLE_NAME.set("sys_test_2020");
25         return sysTestMapper.selectList(null);
26     }
27 
28     @GetMapping("add")
29     @ApiOperation("新增")
30     public String add(){
31         MybatisPlusConfig.TABLE_NAME.set("sys_test_2020");
32         SysTest sysTest = new SysTest();
33         sysTest.setName("test1");
34         sysTest.setGmtCreate(LocalDateTime.now());
35         sysTestMapper.insert(sysTest);
36         return "ok";
37     }
38 }

至此动态表名sql解析完成。

参考：

https://blog.csdn.net/qq_21896123/article/details/108437839

https://blog.csdn.net/dothetrick/article/details/113152874