feat: Relation 所有注解支持通过中间表进行 join 的场景

mybatis-flex-annotation/src/main/java/com/mybatisflex/annotation/RelationManyToMany.java

@@ -35,14 +35,14 @@ public @interface RelationManyToMany {
 	String selfField() default "";
 
     /**
-     * 目标实体类对应的表的 schema，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表的 schema，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return schema 名称
      */
     String targetSchema() default "";
 
     /**
-     * 目标实体类对应的表，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return 表名
      */

mybatis-flex-annotation/src/main/java/com/mybatisflex/annotation/RelationManyToOne.java

@@ -35,14 +35,14 @@ public @interface RelationManyToOne {
     String selfField();
 
     /**
-     * 目标实体类对应的表的 schema，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表的 schema，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return schema 名称
      */
     String targetSchema() default "";
 
     /**
-     * 目标实体类对应的表，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return 表名
      */
@@ -55,6 +55,27 @@ public @interface RelationManyToOne {
 	 */
     String targetField() default "";
 
+    /**
+     * 中间表名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 中间表名称
+     */
+    String joinTable() default "";
+
+    /**
+     * 中间表与当前表的关联字段，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称，列名
+     */
+    String joinSelfColumn() default "";
+
+    /**
+     * 目标表的关联字段名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称和表
+     */
+    String joinTargetColumn() default "";
+
     /**
      * 默认使用哪个数据源，若系统找不到该指定的数据源时，默认使用第一个数据源。
      *

mybatis-flex-annotation/src/main/java/com/mybatisflex/annotation/RelationOneToMany.java

@@ -35,14 +35,14 @@ public @interface RelationOneToMany {
 	String selfField() default "";
 
     /**
-     * 目标实体类对应的表的 schema，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表的 schema，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return schema 名称
      */
     String targetSchema() default "";
 
     /**
-     * 目标实体类对应的表，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return 表名
      */
@@ -55,6 +55,27 @@ public @interface RelationOneToMany {
 	 */
 	String targetField();
 
+    /**
+     * 中间表名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 中间表名称
+     */
+    String joinTable() default "";
+
+    /**
+     * 中间表与当前表的关联字段，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称，列名
+     */
+    String joinSelfColumn() default "";
+
+    /**
+     * 目标表的关联字段名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称和表
+     */
+    String joinTargetColumn() default "";
+
     /**
      * 查询排序。
      *

mybatis-flex-annotation/src/main/java/com/mybatisflex/annotation/RelationOneToOne.java

@@ -35,14 +35,14 @@ public @interface RelationOneToOne {
     String selfField() default "";
 
     /**
-     * 目标实体类对应的表的 schema，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表的 schema，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return schema 名称
      */
     String targetSchema() default "";
 
     /**
-     * 目标实体类对应的表，一般关联数据不是 entity，而是 vo、dto 等需要配置此项
+     * 目标实体类对应的表，一般情况下，关联数据不是 entity，而是 vo、dto 等需要配置此项
      *
      * @return 表名
      */
@@ -55,6 +55,27 @@ public @interface RelationOneToOne {
      */
     String targetField();
 
+    /**
+     * 中间表名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 中间表名称
+     */
+    String joinTable() default "";
+
+    /**
+     * 中间表与当前表的关联字段，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称，列名
+     */
+    String joinSelfColumn() default "";
+
+    /**
+     * 目标表的关联字段名称，一对一的关系是通过通过中间表维护时，需要添加此项配置。
+     *
+     * @return 字段名称和表
+     */
+    String joinTargetColumn() default "";
+
     /**
      * 默认使用哪个数据源，若系统找不到该指定的数据源时，默认使用第一个数据源。
      *

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/AbstractRelation.java

@@ -15,9 +15,9 @@
  */
 package com.mybatisflex.core.relation;
 
-import com.mybatisflex.core.BaseMapper;
 import com.mybatisflex.core.exception.FlexExceptions;
 import com.mybatisflex.core.query.QueryWrapper;
+import com.mybatisflex.core.row.Row;
 import com.mybatisflex.core.table.IdInfo;
 import com.mybatisflex.core.table.TableInfo;
 import com.mybatisflex.core.table.TableInfoFactory;
@@ -31,6 +31,8 @@ import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
+import static com.mybatisflex.core.query.QueryMethods.column;
+
 abstract class AbstractRelation<SelfEntity> {
 
     protected Class<SelfEntity> selfEntityClass;
@@ -47,14 +49,23 @@ abstract class AbstractRelation<SelfEntity> {
     protected TableInfo targetTableInfo;
     protected FieldWrapper targetFieldWrapper;
 
+    protected String joinTable;
+    protected String joinSelfColumn;
+    protected String joinTargetColumn;
+
     protected String dataSource;
 
     public AbstractRelation(String selfField, String targetSchema, String targetTable, String targetField,
+                            String joinTable, String joinSelfColumn, String joinTargetColumn,
                             String dataSource, Class<SelfEntity> entityClass, Field relationField) {
         this.selfEntityClass = entityClass;
         this.relationField = relationField;
         this.relationFieldWrapper = FieldWrapper.of(entityClass, relationField.getName());
 
+        this.joinTable = joinTable;
+        this.joinSelfColumn = joinSelfColumn;
+        this.joinTargetColumn = joinTargetColumn;
+
         this.dataSource = dataSource;
 
         this.selfField = ClassUtil.getFirstField(entityClass, field -> field.getName().equals(selfField));
@@ -144,13 +155,52 @@ abstract class AbstractRelation<SelfEntity> {
         this.targetFieldWrapper = targetFieldWrapper;
     }
 
-    protected Set<Object> getSelfFieldValues(List<SelfEntity> list) {
+    public String getTargetSchema() {
-        if (list == null || list.isEmpty()) {
+        return targetSchema;
+    }
+
+    public void setTargetSchema(String targetSchema) {
+        this.targetSchema = targetSchema;
+    }
+
+    public String getTargetTable() {
+        return targetTable;
+    }
+
+    public void setTargetTable(String targetTable) {
+        this.targetTable = targetTable;
+    }
+
+    public String getJoinTable() {
+        return joinTable;
+    }
+
+    public void setJoinTable(String joinTable) {
+        this.joinTable = joinTable;
+    }
+
+    public String getJoinSelfColumn() {
+        return joinSelfColumn;
+    }
+
+    public void setJoinSelfColumn(String joinSelfColumn) {
+        this.joinSelfColumn = joinSelfColumn;
+    }
+
+    public String getJoinTargetColumn() {
+        return joinTargetColumn;
+    }
+
+    public void setJoinTargetColumn(String joinTargetColumn) {
+        this.joinTargetColumn = joinTargetColumn;
+    }
+
+    public Set<Object> getSelfFieldValues(List<SelfEntity> selfEntities) {
+        if (selfEntities == null || selfEntities.isEmpty()) {
             return Collections.emptySet();
         }
-
         Set<Object> values = new LinkedHashSet<>();
-        list.forEach(self -> {
+        selfEntities.forEach(self -> {
             Object value = selfFieldWrapper.get(self);
             if (value != null && !"".equals(value)) {
                 values.add(value);
@@ -180,6 +230,10 @@ abstract class AbstractRelation<SelfEntity> {
         }
     }
 
+    protected boolean isRelationByMiddleTable() {
+        return StringUtil.isNotBlank(joinTable);
+    }
+
 
     protected static Class<?> getTargetEntityClass(Class<?> entityClass, Field relationField) {
         return FieldWrapper.of(entityClass, relationField.getName()).getMappingType();
@@ -201,21 +255,42 @@ abstract class AbstractRelation<SelfEntity> {
 
 
     /**
-     * 把 Relations 的配置转换为查询的 QueryWrapper
+     * 构建查询目标对象的 QueryWrapper
      *
-     * @param selfEntities 当前的实体类
+     * @param targetValues 条件的值
      * @return QueryWrapper
      */
-    public abstract QueryWrapper toQueryWrapper(List<SelfEntity> selfEntities);
+    public QueryWrapper buildQueryWrapper(Set<Object> targetValues) {
+        QueryWrapper queryWrapper = QueryWrapper.create()
+            .select()
+            .from(getTargetTableWithSchema());
+        if (targetValues.size() > 1) {
+            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).in(targetValues));
+        } else {
+            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).eq(targetValues.iterator().next()));
+        }
+
+        customizeQueryWrapper(queryWrapper);
+
+        return queryWrapper;
+    }
 
 
     /**
-     * 通过 {@link AbstractRelation#toQueryWrapper(List)} 查询到的结果，通过此方法进行内存 join
+     * 方便子类最近自定义的条件
      *
+     * @param queryWrapper 查询条件
+     */
+    public void customizeQueryWrapper(QueryWrapper queryWrapper) {
+        //do thing
+    }
+
+
+    /**
      * @param selfEntities     当前的实体类列表
      * @param targetObjectList 查询到的结果
-     * @param mapper           查询的 Mapper
+     * @param mappingRows      中间表的映射数据，非中间表查询的场景下，mappingRows 永远为 null
-     * @param queriedClasses
      */
-    public abstract void join(List<SelfEntity> selfEntities, List<?> targetObjectList, BaseMapper<?> mapper, Set<Class<?>> queriedClasses);
+    public abstract void join(List<SelfEntity> selfEntities, List<?> targetObjectList, List<Row> mappingRows);
+
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/ManyToMany.java

@@ -16,24 +16,12 @@
 package com.mybatisflex.core.relation;
 
 import com.mybatisflex.annotation.RelationManyToMany;
-import com.mybatisflex.core.BaseMapper;
 import com.mybatisflex.core.query.QueryWrapper;
-import com.mybatisflex.core.row.Row;
-import com.mybatisflex.core.util.ClassUtil;
-import com.mybatisflex.core.util.CollectionUtil;
-import com.mybatisflex.core.util.MapperUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.lang.reflect.Field;
-import java.util.*;
 
-import static com.mybatisflex.core.query.QueryMethods.column;
+class ManyToMany<SelfEntity> extends ToManyRelation<SelfEntity> {
-
-class ManyToMany<SelfEntity> extends AbstractRelation<SelfEntity> {
-
-    private String joinTable;
-    private String joinSelfColumn;
-    private String joinTargetColumn;
 
     private String orderBy;
 
@@ -42,100 +30,19 @@ class ManyToMany<SelfEntity> extends AbstractRelation<SelfEntity> {
             , annotation.targetSchema()
             , annotation.targetTable()
             , getDefaultPrimaryProperty(annotation.targetField(), getTargetEntityClass(entityClass, relationField), "@RelationManyToMany.targetField can not be empty in field: \"" + entityClass.getName() + "." + relationField.getName() + "\"")
+            , annotation.joinTable()
+            , annotation.joinSelfColumn()
+            , annotation.joinTargetColumn()
             , annotation.dataSource(), entityClass, relationField);
-
-        this.joinTable = annotation.joinTable();
-        this.joinSelfColumn = annotation.joinSelfColumn();
-        this.joinTargetColumn = annotation.joinTargetColumn();
-
         this.orderBy = annotation.orderBy();
     }
 
-    @Override
-    public Class<?> getMappingType() {
-        return Row.class;
-    }
-
 
     @Override
-    public QueryWrapper toQueryWrapper(List<SelfEntity> selfEntities) {
+    public void customizeQueryWrapper(QueryWrapper queryWrapper) {
-        Set<Object> selfFieldValues = getSelfFieldValues(selfEntities);
+        if (StringUtil.isNotBlank(orderBy)){
-        if (selfFieldValues.isEmpty()) {
-            return null;
-        }
-
-        QueryWrapper queryWrapper = QueryWrapper.create().select()
-            .from(joinTable);
-        if (selfFieldValues.size() > 1) {
-            queryWrapper.where(column(joinSelfColumn).in(selfFieldValues));
-        } else {
-            queryWrapper.where(column(joinSelfColumn).eq(selfFieldValues.iterator().next()));
-        }
-
-        return queryWrapper;
-    }
-
-
-    @Override
-    public void join(List<SelfEntity> selfEntities, List<?> mappingObjectList, BaseMapper<?> mapper, Set<Class<?>> queriedClasses) {
-        List<Row> mappingRows = (List<Row>) mappingObjectList;
-        Set<Object> targetValues = new LinkedHashSet<>();
-        for (Row row : mappingRows) {
-            Object targetValue = row.getIgnoreCase(joinTargetColumn);
-            if (targetValue != null) {
-                targetValues.add(targetValue);
-            }
-        }
-
-        if (targetValues.isEmpty()) {
-            return;
-        }
-
-        QueryWrapper queryWrapper = QueryWrapper.create().select()
-            .from(getTargetTableWithSchema());
-        if (targetValues.size() > 1) {
-            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).in(targetValues));
-        } else {
-            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).eq(targetValues.iterator().next()));
-        }
-
-        if (StringUtil.isNotBlank(orderBy)) {
             queryWrapper.orderBy(orderBy);
         }
-
-
-        List<?> targetObjectList = mapper.selectListByQueryAs(queryWrapper, relationFieldWrapper.getMappingType());
-
-        RelationManager.doQueryRelations(mapper, targetObjectList, queriedClasses);
-
-        if (CollectionUtil.isNotEmpty(targetObjectList)) {
-            selfEntities.forEach(selfEntity -> {
-                Object selfValue = selfFieldWrapper.get(selfEntity);
-                if (selfValue != null) {
-                    selfValue = selfValue.toString();
-                    Set<String> targetMappingValues = new HashSet<>();
-                    for (Row mappingRow : mappingRows) {
-                        if (selfValue.equals(String.valueOf(mappingRow.getIgnoreCase(joinSelfColumn)))) {
-                            Object joinValue = mappingRow.getIgnoreCase(joinTargetColumn);
-                            if (joinValue != null) {
-                                targetMappingValues.add(joinValue.toString());
-                            }
-                        }
-                    }
-
-                    if (!targetMappingValues.isEmpty()) {
-                        Class<?> wrapType = MapperUtil.getWrapType(relationFieldWrapper.getFieldType());
-                        Collection<Object> collection = (Collection) ClassUtil.newInstance(wrapType);
-                        for (Object targetObject : targetObjectList) {
-                            Object targetValue = targetFieldWrapper.get(targetObject);
-                            if (targetValue != null && targetMappingValues.contains(targetValue.toString())) {
-                                collection.add(targetObject);
-                            }
-                        }
-                        relationFieldWrapper.set(collection, selfEntity);
-                    }
-                }
-            });
-        }
     }
+
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/ManyToOne.java

@@ -27,6 +27,9 @@ class ManyToOne<SelfEntity> extends ToOneRelation<SelfEntity> {
             , annotation.targetTable()
 			, getDefaultPrimaryProperty(annotation.targetField(), getTargetEntityClass(entityClass, relationField)
 				, "@RelationManyToOne.selfField can not be empty in field: \"" + entityClass.getName() + "." + relationField.getName() + "\"")
+            , annotation.joinTable()
+            , annotation.joinSelfColumn()
+            , annotation.joinTargetColumn()
 			, annotation.dataSource()
 			, entityClass
 			, relationField);

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/OneToMany.java

@@ -16,20 +16,12 @@
 package com.mybatisflex.core.relation;
 
 import com.mybatisflex.annotation.RelationOneToMany;
-import com.mybatisflex.core.BaseMapper;
 import com.mybatisflex.core.query.QueryWrapper;
-import com.mybatisflex.core.util.ClassUtil;
-import com.mybatisflex.core.util.MapperUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.lang.reflect.Field;
-import java.util.Collection;
-import java.util.List;
-import java.util.Set;
 
-import static com.mybatisflex.core.query.QueryMethods.column;
+class OneToMany<SelfEntity> extends ToManyRelation<SelfEntity> {
-
-class OneToMany<SelfEntity> extends AbstractRelation<SelfEntity> {
 
 	private String orderBy;
 	private int limit;
@@ -39,53 +31,25 @@ class OneToMany<SelfEntity> extends AbstractRelation<SelfEntity> {
 		super(getDefaultPrimaryProperty(annotation.selfField(), entityClass, "@RelationOneToMany.selfField can not be empty in field: \"" + entityClass.getName() + "." + relationField.getName() + "\"")
             , annotation.targetSchema()
             , annotation.targetTable()
-			, annotation.targetField(), annotation.dataSource(), entityClass, relationField);
+			, annotation.targetField()
+            , annotation.joinTable()
+            , annotation.joinSelfColumn()
+            , annotation.joinTargetColumn()
+            , annotation.dataSource(), entityClass, relationField);
 		this.orderBy = annotation.orderBy();
 		this.limit = annotation.limit();
 	}
 
-	@Override
-	public QueryWrapper toQueryWrapper(List<SelfEntity> selfEntities) {
-		Set<Object> selfFieldValues = getSelfFieldValues(selfEntities);
-		if (selfFieldValues.isEmpty()) {
-			return null;
-		}
-		QueryWrapper queryWrapper = QueryWrapper.create().select()
-			.from(getTargetTableWithSchema());
-		if (selfFieldValues.size() > 1) {
-			queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).in(selfFieldValues));
-		} else {
-			queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).eq(selfFieldValues.iterator().next()));
-		}
 
-		if (StringUtil.isNotBlank(orderBy)) {
+    @Override
-			queryWrapper.orderBy(orderBy);
+    public void customizeQueryWrapper(QueryWrapper queryWrapper) {
-		}
+        if (StringUtil.isNotBlank(orderBy)){
+            queryWrapper.orderBy(orderBy);
+        }
 
-		if (limit > 0) {
+        if (limit > 0){
-			queryWrapper.limit(limit);
+            queryWrapper.limit(limit);
-		}
+        }
+    }
 
-		return queryWrapper;
-	}
-
-
-	@Override
-	public void join(List<SelfEntity> selfEntities, List<?> targetObjectList, BaseMapper<?> mapper, Set<Class<?>> queriedClasses) {
-		selfEntities.forEach(selfEntity -> {
-			Object selfValue = selfFieldWrapper.get(selfEntity);
-			if (selfValue != null) {
-			    selfValue = selfValue.toString();
-				Class<?> wrapType = MapperUtil.getWrapType(relationFieldWrapper.getFieldType());
-				Collection<Object> collection = (Collection) ClassUtil.newInstance(wrapType);
-				for (Object targetObject : targetObjectList) {
-					Object targetValue = targetFieldWrapper.get(targetObject);
-					if (targetValue != null && selfValue.equals(targetValue.toString())) {
-						collection.add(targetObject);
-					}
-				}
-				relationFieldWrapper.set(collection, selfEntity);
-			}
-		});
-	}
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/OneToOne.java

@@ -27,6 +27,9 @@ class OneToOne<SelfEntity> extends ToOneRelation<SelfEntity> {
             , annotation.targetSchema()
             , annotation.targetTable()
 			, annotation.targetField()
+            , annotation.joinTable()
+            , annotation.joinSelfColumn()
+            , annotation.joinTargetColumn()
 			, annotation.dataSource()
 			, entityClass
 			, relationField);

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/RelationManager.java

@@ -32,6 +32,8 @@ import java.lang.reflect.Field;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 
+import static com.mybatisflex.core.query.QueryMethods.column;
+
 /**
  * @author michael
  */
@@ -98,8 +100,47 @@ public class RelationManager {
         try {
             relations.forEach(relation -> {
 
-                QueryWrapper queryWrapper = relation.toQueryWrapper(entities);
+                Class mappingType = relation.getMappingType();
-                Class<?> mappingType = relation.getMappingType();
+                if (queriedClasses.contains(mappingType)) {
+                    return;
+                }
+
+                Set<Object> targetValues;
+                List<Row> mappingRows = null;
+
+                //通过中间表关联查询
+                if (relation.isRelationByMiddleTable()) {
+                    targetValues = new HashSet<>();
+                    Set selfFieldValues = relation.getSelfFieldValues(entities);
+                    QueryWrapper queryWrapper = QueryWrapper.create().select()
+                        .from(relation.getJoinTable());
+                    if (selfFieldValues.size() > 1) {
+                        queryWrapper.where(column(relation.getJoinSelfColumn()).in(selfFieldValues));
+                    } else {
+                        queryWrapper.where(column(relation.getJoinTargetColumn()).eq(selfFieldValues.iterator().next()));
+                    }
+
+                    mappingRows = mapper.selectListByQueryAs(queryWrapper, Row.class);
+                    if (CollectionUtil.isEmpty(mappingRows)) {
+                        return;
+                    }
+
+                    for (Row mappingData : mappingRows) {
+                        Object targetValue = mappingData.getIgnoreCase(relation.getJoinTargetColumn());
+                        if (targetValue != null) {
+                            targetValues.add(targetValue);
+                        }
+                    }
+                }
+                //通过外键字段关联查询
+                else {
+                    targetValues = relation.getSelfFieldValues(entities);
+                }
+
+                if (CollectionUtil.isEmpty(targetValues)) {
+                    return;
+                }
+
 
                 String dataSource = relation.getDataSource();
                 if (StringUtil.isBlank(dataSource) && currentDsKey != null) {
@@ -111,13 +152,11 @@ public class RelationManager {
                         DataSourceKey.use(dataSource);
                     }
 
+                    QueryWrapper queryWrapper = relation.buildQueryWrapper(targetValues);
                     List<?> targetObjectList = mapper.selectListByQueryAs(queryWrapper, mappingType);
-                    if (mappingType != Row.class) {
-                        doQueryRelations(mapper, targetObjectList, queriedClasses);
-                    }
-
                     if (CollectionUtil.isNotEmpty(targetObjectList)) {
-                        relation.join(entities, targetObjectList, mapper, queriedClasses);
+                        doQueryRelations(mapper, targetObjectList, queriedClasses);
+                        relation.join(entities, targetObjectList, mappingRows);
                     }
                 } finally {
                     if (StringUtil.isNotBlank(dataSource)) {

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/ToManyRelation.java

@@ -0,0 +1,77 @@
+/*
+ *  Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package com.mybatisflex.core.relation;
+
+import com.mybatisflex.core.row.Row;
+import com.mybatisflex.core.util.ClassUtil;
+import com.mybatisflex.core.util.MapperUtil;
+
+import java.lang.reflect.Field;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+class ToManyRelation<SelfEntity> extends AbstractRelation<SelfEntity> {
+
+
+    public ToManyRelation(String selfField, String targetSchema, String targetTable, String targetField,
+                          String joinTable, String joinSelfColumn, String joinTargetColumn,
+                          String dataSource, Class<SelfEntity> selfEntityClass, Field relationField) {
+        super(selfField, targetSchema, targetTable, targetField,
+            joinTable, joinSelfColumn, joinTargetColumn,
+            dataSource, selfEntityClass, relationField);
+    }
+
+
+    @SuppressWarnings("rawtypes")
+    @Override
+    public void join(List<SelfEntity> selfEntities, List<?> targetObjectList, List<Row> mappingRows) {
+        selfEntities.forEach(selfEntity -> {
+            Object selfValue = selfFieldWrapper.get(selfEntity);
+            if (selfValue != null) {
+                selfValue = selfValue.toString();
+                Set<String> targetMappingValues = new HashSet<>();
+                if (mappingRows != null) {
+                    for (Row mappingRow : mappingRows) {
+                        if (selfValue.equals(String.valueOf(mappingRow.getIgnoreCase(joinSelfColumn)))) {
+                            Object joinValue = mappingRow.getIgnoreCase(joinTargetColumn);
+                            if (joinValue != null) {
+                                targetMappingValues.add(joinValue.toString());
+                            }
+                        }
+                    }
+                } else {
+                    targetMappingValues.add((String) selfValue);
+                }
+
+                if (targetMappingValues.isEmpty()) {
+                    return;
+                }
+
+                Class<?> wrapType = MapperUtil.getWrapType(relationFieldWrapper.getFieldType());
+                Collection collection = (Collection) ClassUtil.newInstance(wrapType);
+                for (Object targetObject : targetObjectList) {
+                    Object targetValue = targetFieldWrapper.get(targetObject);
+                    if (targetValue != null && targetMappingValues.contains(targetValue.toString())) {
+                        collection.add(targetObject);
+                    }
+                }
+                relationFieldWrapper.set(collection, selfEntity);
+            }
+        });
+    }
+}

mybatis-flex-core/src/main/java/com/mybatisflex/core/relation/ToOneRelation.java

@@ -15,50 +15,42 @@
  */
 package com.mybatisflex.core.relation;
 
-import com.mybatisflex.core.BaseMapper;
+import com.mybatisflex.core.row.Row;
-import com.mybatisflex.core.query.QueryWrapper;
 
 import java.lang.reflect.Field;
 import java.util.List;
-import java.util.Set;
-
-import static com.mybatisflex.core.query.QueryMethods.column;
 
 class ToOneRelation<SelfEntity> extends AbstractRelation<SelfEntity> {
 
 
     public ToOneRelation(String selfField, String targetSchema, String targetTable, String targetField,
+                         String joinTable, String joinSelfColumn, String joinTargetColumn,
                          String dataSource, Class<SelfEntity> selfEntityClass, Field relationField) {
-        super(selfField, targetSchema, targetTable, targetField, dataSource, selfEntityClass, relationField);
+        super(selfField, targetSchema, targetTable, targetField,
+            joinTable, joinSelfColumn, joinTargetColumn,
+            dataSource, selfEntityClass, relationField);
     }
 
 
     @Override
-    public QueryWrapper toQueryWrapper(List<SelfEntity> selfEntities) {
+    public void join(List<SelfEntity> selfEntities, List<?> targetObjectList, List<Row> mappingRows) {
-        Set<Object> selfFieldValues = getSelfFieldValues(selfEntities);
-        if (selfFieldValues.isEmpty()) {
-            return null;
-        }
-        QueryWrapper queryWrapper = QueryWrapper.create().select()
-            .from(getTargetTableWithSchema());
-        if (selfFieldValues.size() > 1) {
-            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).in(selfFieldValues));
-        } else {
-            queryWrapper.where(column(targetTableInfo.getColumnByProperty(targetField.getName())).eq(selfFieldValues.iterator().next()));
-        }
-        return queryWrapper;
-    }
-
-
-    @Override
-    public void join(List<SelfEntity> selfEntities, List<?> targetObjectList, BaseMapper<?> mapper, Set<Class<?>> queriedClasses) {
         selfEntities.forEach(selfEntity -> {
             Object selfValue = selfFieldWrapper.get(selfEntity);
             if (selfValue != null) {
                 selfValue = selfValue.toString();
+                String targetMappingValue = null;
+                if (mappingRows != null) {
+                    targetMappingValue = getTargetMappingValue(mappingRows, selfValue);
+                    if (targetMappingValue == null) {
+                        return;
+                    }
+                } else {
+                    targetMappingValue = (String) selfValue;
+                }
+
                 for (Object targetObject : targetObjectList) {
                     Object targetValue = targetFieldWrapper.get(targetObject);
-                    if (targetValue != null && selfValue.equals(targetValue.toString())) {
+                    if (targetValue != null && targetMappingValue.equals(targetValue.toString())) {
                         relationFieldWrapper.set(targetObject, selfEntity);
                         break;
                     }
@@ -66,4 +58,17 @@ class ToOneRelation<SelfEntity> extends AbstractRelation<SelfEntity> {
             }
         });
     }
+
+
+    private String getTargetMappingValue(List<Row> mappingRows, Object selfValue) {
+        for (Row mappingRow : mappingRows) {
+            if (selfValue.equals(String.valueOf(mappingRow.getIgnoreCase(joinSelfColumn)))) {
+                Object joinValue = mappingRow.getIgnoreCase(joinTargetColumn);
+                if (joinValue != null) {
+                   return joinValue.toString();
+                }
+            }
+        }
+        return null;
+    }
 }

mybatis-flex-test/mybatis-flex-native-test/src/main/java/com/mybatisflex/test/relation/onetoone/Account.java

@@ -32,7 +32,9 @@ public class Account implements Serializable {
     private int age;
 
     //    @RelationOneToOne(selfField = "id", targetField = "accountId")
-//    @RelationOneToOne(targetField = "accountId")
+    @RelationOneToOne(targetField = "accountId")
+//    @RelationManyToOne(joinTable = "tb_idcard_mapping",joinSelfColumn = "account_id",joinTargetColumn = "idcard_id"
+//    ,selfField = "id",targetField = "accountId")
     private IDCard idCard;
 
     //    @RelationOneToMany(selfField = "id", targetField = "accountId")
@@ -44,11 +46,11 @@ public class Account implements Serializable {
 //            selfField = "id", joinSelfColumn = "account_id",
 //            targetField = "id", joinTargetColumn = "role_id"
 //    )
-    @RelationManyToMany(
+//    @RelationManyToMany(
-            joinTable = "tb_role_mapping",
+//            joinTable = "tb_role_mapping",
-            joinSelfColumn = "account_id",
+//            joinSelfColumn = "account_id",
-            joinTargetColumn = "role_id"
+//            joinTargetColumn = "role_id"
-    )
+//    )
     private List<Role> roles;
 
 

mybatis-flex-test/mybatis-flex-native-test/src/main/java/com/mybatisflex/test/relation/onetoone/AccountDTO.java

@@ -0,0 +1,112 @@
+/*
+ *  Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package com.mybatisflex.test.relation.onetoone;
+
+import com.mybatisflex.annotation.RelationManyToMany;
+
+import java.io.Serializable;
+import java.util.List;
+
+public class AccountDTO implements Serializable {
+
+    private Long id;
+
+    private String userName;
+
+    private int age;
+
+    //    @RelationOneToOne(selfField = "id", targetField = "accountId")
+//    @RelationOneToOne(targetField = "accountId")
+    private IDCard idCard;
+
+    //    @RelationOneToMany(selfField = "id", targetField = "accountId")
+//    @RelationOneToMany(targetField = "accountId")
+    private List<Book> books;
+
+    //    @RelationManyToMany(
+//            joinTable = "tb_role_mapping",
+//            selfField = "id", joinSelfColumn = "account_id",
+//            targetField = "id", joinTargetColumn = "role_id"
+//    )
+    @RelationManyToMany(
+            joinTable = "tb_role_mapping",
+            joinSelfColumn = "account_id",
+            joinTargetColumn = "role_id"
+    )
+    private List<Role> roles;
+
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public IDCard getIdCard() {
+        return idCard;
+    }
+
+    public void setIdCard(IDCard idCard) {
+        this.idCard = idCard;
+    }
+
+    public List<Book> getBooks() {
+        return books;
+    }
+
+    public void setBooks(List<Book> books) {
+        this.books = books;
+    }
+
+    public List<Role> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(List<Role> roles) {
+        this.roles = roles;
+    }
+
+    @Override
+    public String toString() {
+        return "AccountDTO{" +
+                "id=" + id +
+                ", userName='" + userName + '\'' +
+                ", age=" + age +
+                ", idCard=" + idCard +
+                ", books=" + books +
+                ", roles=" + roles +
+                '}';
+    }
+}

mybatis-flex-test/mybatis-flex-native-test/src/main/resources/relation/onetoone/data.sql

@@ -13,6 +13,16 @@ VALUES (1,'0001', '内容1'),
        (4,'0004', '内容4'),
        (5,'0005', '内容5');
 
+INSERT INTO tb_idcard_mapping
+VALUES (1,1),
+       (2,2),
+       (3,3),
+       (4,4),
+       (5,5);
+
+
+
+
 INSERT INTO tb_book
 VALUES (1,1,'图书1', '内容1'),
        (2,2,'图书2', '内容2'),
@@ -49,4 +59,4 @@ VALUES (1,0,'顶级菜单1'),
        (10,5,'子菜单'),
        (10,5,'子菜单'),
        (10,9,'子菜单'),
-       (10,9,'子菜单');
+       (10,9,'子菜单');

mybatis-flex-test/mybatis-flex-native-test/src/main/resources/relation/onetoone/schema.sql

@@ -14,6 +14,15 @@ CREATE TABLE IF NOT EXISTS `tb_idcard`
 );
 
 
+CREATE TABLE IF NOT EXISTS `tb_idcard_mapping`
+(
+    `account_id` Integer,
+    `idcard_id`      Integer
+);
+
+
+
+
 CREATE TABLE IF NOT EXISTS `tb_book`
 (
     `id`        INTEGER auto_increment,
@@ -39,4 +48,4 @@ CREATE TABLE IF NOT EXISTS `tb_menu`
     `id`        INTEGER auto_increment,
     `parent_id`        INTEGER,
     `name`      VARCHAR(100)
-);
+);