mybatis plus 动态表名 SQL 解析器

绝地灬酷狼 2024-04-19 14:25 8阅读 0赞

github地址[https://github.com/heng1234/mybatis\_plus][https_github.com_heng1234_mybatis_plus]

基于[https://blog.csdn.net/qq\_39313596/article/details/100943090][https_blog.csdn.net_qq_39313596_article_details_100943090]文章

需求如果多张表比如说 user user\_a user\_b 里面的字段一样的表名不一样需求需要动态表名替换查询

那么sql解析器就祈祷作用了

在MybatisPlusConfig加入sql解析器

public static ThreadLocal<String> myTableName = new ThreadLocal<>();
    
    /**
         * 分页插件
         * @return
         */
    
        @Bean
        public PaginationInterceptor paginationInterceptor() {
            PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        
            /*动态表名*/
            List<ISqlParser> sqlParserList = new ArrayList<>();
            DynamicTableNameParser dynamicTableNameParser = new DynamicTableNameParser();
            Map<String, ITableNameHandler> tableNameHandlerMap = new HashMap<>();
       //User是数据库表名
            tableNameHandlerMap.put("User", new ITableNameHandler() {
                @Override
                public String dynamicTableName(MetaObject metaObject, String sql, String tableName) {
                    return myTableName.get();//返回null不会替换 注意 多租户过滤会将它一块过滤不会替换@SqlParser(filter=true) 可不会替换
                }
            });
            dynamicTableNameParser.setTableNameHandlerMap(tableNameHandlerMap);
            sqlParserList.add(dynamicTableNameParser);
            paginationInterceptor.setSqlParserList(sqlParserList);
    
            return  paginationInterceptor;
        }

测试

/**
         * 查询所有user
         */
        @Test
        public void testSelect() {
            MybatisPlusConfig.myTableName.set("user_2019");
            System.out.println(("----- selectAll method test ------"));
            List<User> userList = userMapper.selectList(null);
          //  Assert.assertEquals(5, userList.size());
            userList.forEach(System.out::println);
        }

执行sql

Consume Time：171 ms 2019-09-18 22:20:15
     Execute SQL：SELECT id,name,age,email,manager_id,created_time,update_time,version FROM user_2019 WHERE deleted=0

注意

返回null不会替换 注意 多租户过滤会将它一块过滤不会替换@SqlParser(filter=true) 可不会替换

[https_github.com_heng1234_mybatis_plus]: https://github.com/heng1234/mybatis_plus
[https_blog.csdn.net_qq_39313596_article_details_100943090]: https://blog.csdn.net/qq_39313596/article/details/100943090