支持返回基本数据类型

mybatis-plus-join-core/src/main/java/com/github/yulichang/interceptor/MPJInterceptor.java

@@ -7,6 +7,7 @@ import com.baomidou.mybatisplus.core.toolkit.*;
 import com.github.yulichang.interfaces.MPJBaseJoin;
 import com.github.yulichang.method.MPJResultType;
 import com.github.yulichang.toolkit.Constant;
+import com.github.yulichang.toolkit.MPJReflectionKit;
 import com.github.yulichang.toolkit.support.SelectColumn;
 import com.github.yulichang.wrapper.MPJLambdaWrapper;
 import com.github.yulichang.wrapper.resultmap.MybatisLabel;
@@ -148,6 +149,10 @@ public class MPJInterceptor implements Interceptor {
         List<ResultMap> result = new ArrayList<>();
         TableInfo tableInfo = TableInfoHelper.getTableInfo(resultType);
         String id = ms.getId() + StringPool.DOT + Constants.MYBATIS_PLUS + StringPool.UNDERSCORE + resultType.getName();
+        //基本数据类型
+        if (MPJReflectionKit.isPrimitiveOrWrapper(resultType)) {
+            return Collections.singletonList(new ResultMap.Builder(ms.getConfiguration(), id, resultType, EMPTY_RESULT_MAPPING).build());
+        }
         if (!(obj instanceof MPJLambdaWrapper) || Map.class.isAssignableFrom(resultType) ||
                 Collection.class.isAssignableFrom(resultType)) {
             result.add(getDefaultResultMap(tableInfo, ms, resultType, id));

mybatis-plus-join-core/src/main/java/com/github/yulichang/toolkit/MPJReflectionKit.java

@@ -1,10 +1,13 @@
 package com.github.yulichang.toolkit;
 
+import com.baomidou.mybatisplus.core.toolkit.Assert;
+
 import java.lang.reflect.Field;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 import java.lang.reflect.WildcardType;
 import java.util.HashMap;
+import java.util.IdentityHashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -21,6 +24,28 @@ public final class MPJReflectionKit {
 
     private static final Map<String, Field> EMPTY_MAP = new HashMap<>();
 
+
+    @Deprecated
+    @SuppressWarnings("DeprecatedIsStillUsed")
+    private static final Map<Class<?>, Class<?>> PRIMITIVE_WRAPPER_TYPE_MAP = new IdentityHashMap<>(8);
+
+    @SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
+    private static final Map<Class<?>, Class<?>> PRIMITIVE_TYPE_TO_WRAPPER_MAP = new IdentityHashMap<>(8);
+
+    static {
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Boolean.class, boolean.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Byte.class, byte.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Character.class, char.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Double.class, double.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Float.class, float.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Integer.class, int.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Long.class, long.class);
+        PRIMITIVE_WRAPPER_TYPE_MAP.put(Short.class, short.class);
+        for (Map.Entry<Class<?>, Class<?>> entry : PRIMITIVE_WRAPPER_TYPE_MAP.entrySet()) {
+            PRIMITIVE_TYPE_TO_WRAPPER_MAP.put(entry.getValue(), entry.getKey());
+        }
+    }
+
     /**
      * Collection字段的泛型
      */
@@ -59,4 +84,9 @@ public final class MPJReflectionKit {
         CLASS_FIELD_CACHE.put(clazz, map);
         return map;
     }
+
+    public static boolean isPrimitiveOrWrapper(Class<?> clazz) {
+        Assert.notNull(clazz, "Class must not be null");
+        return (clazz.isPrimitive() || PRIMITIVE_WRAPPER_TYPE_MAP.containsKey(clazz));
+    }
 }

mybatis-plus-join-test/test-join/src/test/java/com/github/yulichang/test/join/LambdaWrapperTest.java

@@ -45,6 +45,20 @@ class LambdaWrapperTest {
         list.forEach(System.out::println);
     }
 
+    /**
+     * 基本数据类型测试
+     */
+    @Test
+    void testWrapper() {
+        MPJLambdaWrapper<UserDO> wrapper = new MPJLambdaWrapper<UserDO>()
+                .select(UserDO::getId)
+                .leftJoin(AddressDO.class, AddressDO::getUserId, UserDO::getId)
+                .leftJoin(AreaDO.class, AreaDO::getId, AddressDO::getAreaId);
+        List<Integer> list = userMapper.selectJoinList(Integer.class, wrapper);
+
+        System.out.println(list);
+    }
+
 
     /**
      * 简单的分页关联查询 lambda