Support batch insert

Author: making

demo-mybatis/src/main/java/com/example/PizzaRepository.java

@@ -52,7 +52,7 @@ public Pizza save(Pizza pizza) {
         dto.setPrice(pizza.getPrice());
         dto.setBaseId(pizza.getBase().getId());
         pizzaMapper.insert(dto);
-        // TODO batch insert
+        pizzaMapper.flush(); // generate key here in BATCH mode
         pizza.getToppings().forEach(t -> pizzaMapper.insertToppings(new PizzaToppings(dto.getId(), t.getId())));
         return pizza;
     }

demo-mybatis/src/main/java/com/example/mybatis/PizzaMapper.java

@@ -1,9 +1,6 @@
 package com.example.mybatis;
 
-import org.apache.ibatis.annotations.Insert;
-import org.apache.ibatis.annotations.Mapper;
-import org.apache.ibatis.annotations.Options;
-import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.*;
 
 import java.util.List;
 
@@ -18,4 +15,7 @@ public interface PizzaMapper {
 
     @Select("SELECT p.id, p.name, p.price, b.id AS baseId, b.name AS baseName, t.id AS toppingId, t.name AS toppingName FROM pizza p INNER JOIN base b ON (b.id = p.base_id) INNER JOIN pizza_toppings pt ON (pt.pizza_id = p.id) INNER JOIN topping t ON (t.id = pt.toppings_id) ORDER BY p.id ASC")
     List<Pizza> findOrderByIdAsc();
+
+    @Flush
+    void flush();
 }

demo-mybatis/src/main/resources/application.properties

@@ -1,2 +1,3 @@
+mybatis.executor-type=batch
 mybatis.configuration.map-underscore-to-camel-case=true
 logging.level.com.example.mybatis=DEBUG