<dependency>
    <groupId>com.mybatisflex</groupId>
    <artifactId>mybatis-flex-spring-boot-starter</artifactId>
    <version>1.4.3</version>
</dependency>

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:6033/db_order_plus?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
    username: root
    password: root
  mybatis-flex:
    mapper-locations: classpath:mapper/**/*Mapper.xml
    configuration:
      map-underscore-to-camel-case: true

INSERT INTO mysql_query_rules (rule_id, active, match_pattern, destination_hostgroup)
VALUES (1, 1, '^SELECT.*', 20),
       (2, 1, '^INSERT.*|^UPDATE.*|^DELETE.*', 10);

LOAD MYSQL QUERY RULES TO RUNTIME;
SAVE MYSQL QUERY RULES TO DISK;

package com.example.demo.entity;

public class Order {
    private Long id;
    private String orderName;

    // Getters and Setters
}

package com.example.demo.mapper;

import com.example.demo.entity.Order;
import org.apache.ibatis.annotations.Select;

public interface OrderMapper {
    
    @Select("SELECT * FROM orders WHERE id = #{id}")
    Order selectOrderById(Long id);
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.example.demo.mapper.OrderMapper">
    <select id="selectOrderById" resultType="com.example.demo.entity.Order">
        SELECT * FROM orders WHERE id = #{id}
    </select>
</mapper>

package com.example.demo.service;

import com.example.demo.entity.Order;
import com.example.demo.mapper.OrderMapper;
import org.springframework.stereotype.Service;

@Service
public class OrderService {

    private final OrderMapper orderMapper;

    public OrderService(OrderMapper orderMapper) {
        this.orderMapper = orderMapper;
    }

    public Order getOrderById(Long id) {
        return orderMapper.selectOrderById(id);
    }
}

package com.example.demo.controller;

import com.example.demo.entity.Order;
import com.example.demo.service.OrderService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class OrderController {

    private final OrderService orderService;

    public OrderController(OrderService orderService) {
        this.orderService = orderService;
    }

    @GetMapping("/orders/{id}")
    public Order getOrderById(@PathVariable Long id) {
        return orderService.getOrderById(id);
    }
}

mvn spring-boot:run

SET mysql-monitor_replication_lag_interval_ms = 1000;

INSERT INTO mysql_replication_hostgroups (writer_hostgroup, reader_hostgroup, check_type, max_replication_lag)
VALUES (10, 20, 'seconds_behind_master', 5);

LOAD MYSQL VARIABLES TO RUNTIME;
SAVE MYSQL VARIABLES TO DISK;