feat: QueryWrapper 支持 clone() 方法。

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/ArithmeticQueryColumn.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.CollectionUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.util.ArrayList;
@@ -96,6 +97,14 @@ public class ArithmeticQueryColumn extends QueryColumn {
         return sql.toString();
     }
 
+    @Override
+    public ArithmeticQueryColumn clone() {
+        ArithmeticQueryColumn clone = (ArithmeticQueryColumn) super.clone();
+        // deep clone ...
+        clone.arithmeticInfos = CollectionUtil.cloneValue(this.arithmeticInfos, ArrayList::new);
+        return clone;
+    }
+
 
     @Override
     String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
@@ -107,12 +116,13 @@ public class ArithmeticQueryColumn extends QueryColumn {
     }
 
 
-    static class ArithmeticInfo {
+    static class ArithmeticInfo implements CloneSupport<ArithmeticInfo> {
+
         private String symbol;
         private Object value;
 
         public ArithmeticInfo(Object value) {
-            this.value = value;
+            this(null, value);
         }
 
         public ArithmeticInfo(String symbol, Object value) {
@@ -129,5 +139,14 @@ public class ArithmeticQueryColumn extends QueryColumn {
             }
             return index == 0 ? valueSql : symbol  + valueSql;
         }
+
+        @Override
+        public ArithmeticInfo clone() {
+            try {
+                return (ArithmeticInfo) super.clone();
+            } catch (CloneNotSupportedException e) {
+                throw new AssertionError();
+            }
+        }
     }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/BaseQueryWrapper.java

@@ -1,24 +1,27 @@
-/**
- * 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.
+/*
+ *  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.query;
 
-import java.io.Serializable;
+import com.mybatisflex.core.util.CollectionUtil;
+import com.mybatisflex.core.util.ObjectUtil;
+
 import java.util.*;
 
-public class BaseQueryWrapper<T> implements Serializable {
+@SuppressWarnings({"unchecked", "unused"})
+public class BaseQueryWrapper<T extends BaseQueryWrapper<T>> implements CloneSupport<T> {
 
 
     protected List<QueryTable> queryTables;
@@ -256,4 +259,26 @@ public class BaseQueryWrapper<T> implements Serializable {
     protected <R> R getContext(String key){
         return context == null ? null : (R) context.get(key);
     }
+
+    @Override
+    public T clone() {
+        try {
+            T clone = (T) super.clone();
+            // deep clone ...
+            clone.queryTables = CollectionUtil.cloneValue(this.queryTables, ArrayList::new);
+            clone.selectColumns = CollectionUtil.cloneValue(this.selectColumns, LinkedList::new);
+            clone.joins = CollectionUtil.cloneValue(this.joins, LinkedList::new);
+            clone.joinTables = CollectionUtil.cloneValue(this.joinTables, ArrayList::new);
+            clone.whereQueryCondition = ObjectUtil.clone(this.whereQueryCondition);
+            clone.groupByColumns = CollectionUtil.cloneValue(this.groupByColumns, LinkedList::new);
+            clone.havingQueryCondition = ObjectUtil.clone(this.havingQueryCondition);
+            clone.orderBys = CollectionUtil.cloneValue(this.orderBys, LinkedList::new);
+            clone.unions = CollectionUtil.cloneValue(this.unions, ArrayList::new);
+            clone.endFragments = CollectionUtil.newArrayList(this.endFragments);
+            clone.context = CollectionUtil.newHashMap(this.context);
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/Brackets.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.util.List;
@@ -25,7 +26,7 @@ import java.util.List;
  */
 public class Brackets extends QueryCondition {
 
-    private final QueryCondition childCondition;
+    private QueryCondition childCondition;
 
     public Brackets(QueryCondition childCondition) {
         this.childCondition = childCondition;
@@ -111,4 +112,12 @@ public class Brackets extends QueryCondition {
                 "childCondition=" + childCondition +
                 '}';
     }
+
+    @Override
+    public Brackets clone() {
+        Brackets clone = (Brackets) super.clone();
+        // deep clone ...
+        clone.childCondition = ObjectUtil.clone(this.childCondition);
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseQueryColumn.java

@@ -1,27 +1,24 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.FlexConsts;
 import com.mybatisflex.core.dialect.DialectFactory;
 import com.mybatisflex.core.dialect.IDialect;
-import com.mybatisflex.core.util.ArrayUtil;
-import com.mybatisflex.core.util.LambdaGetter;
-import com.mybatisflex.core.util.LambdaUtil;
-import com.mybatisflex.core.util.StringUtil;
+import com.mybatisflex.core.util.*;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -56,6 +53,14 @@ public class CaseQueryColumn extends QueryColumn implements HasParamsColumn {
         return sql.toString();
     }
 
+    @Override
+    public CaseQueryColumn clone() {
+        CaseQueryColumn clone = (CaseQueryColumn) super.clone();
+        // deep clone ...
+        clone.whens = CollectionUtil.cloneValue(this.whens, ArrayList::new);
+        return clone;
+    }
+
 
     @Override
     String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
@@ -100,14 +105,14 @@ public class CaseQueryColumn extends QueryColumn implements HasParamsColumn {
         for (When when : whens) {
             values = ArrayUtil.concat(values, WrapperUtil.getValues(when.whenCondition));
         }
-        if (elseValue instanceof HasParamsColumn){
-            values = ArrayUtil.concat(values,((HasParamsColumn) elseValue).getParamValues());
+        if (elseValue instanceof HasParamsColumn) {
+            values = ArrayUtil.concat(values, ((HasParamsColumn) elseValue).getParamValues());
         }
         return values;
     }
 
 
-    public static class When {
+    public static class When implements CloneSupport<When> {
         private Builder builder;
         private QueryCondition whenCondition;
         private Object thenValue;
@@ -122,9 +127,22 @@ public class CaseQueryColumn extends QueryColumn implements HasParamsColumn {
             this.builder.caseQueryColumn.addWhen(this);
             return builder;
         }
+
+        @Override
+        public When clone() {
+            try {
+                When clone = (When) super.clone();
+                // deep clone ...
+                clone.whenCondition = ObjectUtil.clone(this.whenCondition);
+                clone.thenValue = ObjectUtil.cloneObject(this.thenValue);
+                return clone;
+            } catch (CloneNotSupportedException e) {
+                throw new AssertionError();
+            }
+        }
     }
 
-    public static class Builder {
+    public static class Builder implements CloneSupport<Builder> {
 
         private CaseQueryColumn caseQueryColumn = new CaseQueryColumn();
 
@@ -140,5 +158,17 @@ public class CaseQueryColumn extends QueryColumn implements HasParamsColumn {
         public CaseQueryColumn end() {
             return caseQueryColumn;
         }
+
+        @Override
+        public Builder clone() {
+            try {
+                Builder clone = (Builder) super.clone();
+                // deep clone ...
+                clone.caseQueryColumn = this.caseQueryColumn.clone();
+                return clone;
+            } catch (CloneNotSupportedException e) {
+                throw new AssertionError();
+            }
+        }
     }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CaseSearchQueryColumn.java

@@ -1,27 +1,24 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.FlexConsts;
 import com.mybatisflex.core.dialect.DialectFactory;
 import com.mybatisflex.core.dialect.IDialect;
-import com.mybatisflex.core.util.ArrayUtil;
-import com.mybatisflex.core.util.LambdaGetter;
-import com.mybatisflex.core.util.LambdaUtil;
-import com.mybatisflex.core.util.StringUtil;
+import com.mybatisflex.core.util.*;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -49,6 +46,15 @@ public class CaseSearchQueryColumn extends QueryColumn implements HasParamsColum
         return sql.toString();
     }
 
+    @Override
+    public CaseSearchQueryColumn clone() {
+        CaseSearchQueryColumn clone = (CaseSearchQueryColumn) super.clone();
+        // deep clone ...
+        clone.queryColumn = ObjectUtil.clone(this.queryColumn);
+        clone.whens = CollectionUtil.cloneValue(this.whens, ArrayList::new);
+        return clone;
+    }
+
 
     @Override
     String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
@@ -107,7 +113,7 @@ public class CaseSearchQueryColumn extends QueryColumn implements HasParamsColum
     }
 
 
-    public static class When {
+    public static class When implements CloneSupport<When> {
         private Builder builder;
         private Object searchValue;
         private Object thenValue;
@@ -122,12 +128,28 @@ public class CaseSearchQueryColumn extends QueryColumn implements HasParamsColum
             this.builder.caseQueryColumn.addWhen(this);
             return builder;
         }
+
+        @Override
+        public When clone() {
+            try {
+                When clone = (When) super.clone();
+                // deep clone ...
+                clone.searchValue = ObjectUtil.cloneObject(this.searchValue);
+                clone.thenValue = ObjectUtil.cloneObject(this.thenValue);
+                return clone;
+            } catch (CloneNotSupportedException e) {
+                throw new AssertionError();
+            }
+        }
     }
 
-    public static class Builder {
+    public static class Builder implements CloneSupport<Builder> {
 
         private CaseSearchQueryColumn caseQueryColumn = new CaseSearchQueryColumn();
 
+        private Builder() {
+        }
+
         public Builder(QueryColumn queryColumn) {
             this.caseQueryColumn.queryColumn = queryColumn;
         }
@@ -144,5 +166,17 @@ public class CaseSearchQueryColumn extends QueryColumn implements HasParamsColum
         public CaseSearchQueryColumn end() {
             return caseQueryColumn;
         }
+
+        @Override
+        public Builder clone() {
+            try {
+                Builder clone = (Builder) super.clone();
+                // deep clone ...
+                clone.caseQueryColumn = this.caseQueryColumn.clone();
+                return clone;
+            } catch (CloneNotSupportedException e) {
+                throw new AssertionError();
+            }
+        }
     }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/CloneSupport.java

@@ -0,0 +1,39 @@
+/*
+ *  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.query;
+
+import java.io.Serializable;
+
+/**
+ * <p>克隆支持接口。
+ *
+ * <p>支持序列化克隆与 {@link Object#clone()} 方法。
+ *
+ * @param <T> 克隆对象类型
+ * @author 王帅
+ * @since 2023-06-10
+ */
+public interface CloneSupport<T> extends Serializable, Cloneable {
+
+    /**
+     * 改写 {@link Object#clone()} 方法。
+     *
+     * @return 克隆对象
+     */
+    T clone();
+
+}

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/DistinctQueryColumn.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -19,11 +19,12 @@ import com.mybatisflex.core.dialect.IDialect;
 import com.mybatisflex.core.util.CollectionUtil;
 import com.mybatisflex.core.util.StringUtil;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class DistinctQueryColumn extends QueryColumn {
 
-    private final List<QueryColumn> queryColumns;
+    private List<QueryColumn> queryColumns;
 
     public DistinctQueryColumn(QueryColumn... queryColumns) {
         this.queryColumns = CollectionUtil.newArrayList(queryColumns);
@@ -37,4 +38,12 @@ public class DistinctQueryColumn extends QueryColumn {
         return " DISTINCT " + StringUtil.join(", ", queryColumns, queryColumn ->
                 queryColumn.toSelectSql(queryTables, dialect));
     }
+
+    @Override
+    public DistinctQueryColumn clone() {
+        DistinctQueryColumn clone = (DistinctQueryColumn) super.clone();
+        // deep clone ...
+        clone.queryColumns = CollectionUtil.cloneValue(this.queryColumns, ArrayList::new);
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/FunctionQueryColumn.java

@@ -1,22 +1,23 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.FlexConsts;
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 import com.mybatisflex.core.util.SqlUtil;
 import com.mybatisflex.core.util.StringUtil;
 
@@ -88,5 +89,13 @@ public class FunctionQueryColumn extends QueryColumn implements HasParamsColumn
                 '}';
     }
 
+    @Override
+    public FunctionQueryColumn clone() {
+        FunctionQueryColumn clone = (FunctionQueryColumn) super.clone();
+        // deep clone ...
+        clone.column = ObjectUtil.clone(this.column);
+        return clone;
+    }
+
 
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/Join.java

@@ -1,23 +1,23 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 
-import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Supplier;
@@ -26,7 +26,7 @@ import java.util.function.Supplier;
  * @author michael yang (fuhai999@gmail.com)
  * @Date: 2020/1/14
  */
-public class Join implements Serializable {
+public class Join implements CloneSupport<Join> {
 
     private static final long serialVersionUID = 1L;
 
@@ -39,7 +39,7 @@ public class Join implements Serializable {
 
 
     protected final String type;
-    protected final QueryTable queryTable;
+    protected QueryTable queryTable;
     protected QueryCondition on;
     protected boolean effective;
 
@@ -92,4 +92,17 @@ public class Join implements Serializable {
         sql.append(" ON ").append(on.toSql(newQueryTables, dialect));
         return sql.toString();
     }
+
+    @Override
+    public Join clone() {
+        try {
+            Join clone = (Join) super.clone();
+            // deep clone ...
+            clone.queryTable = ObjectUtil.clone(this.queryTable);
+            clone.on = ObjectUtil.clone(this.on);
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/OperatorQueryCondition.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.util.List;
@@ -27,7 +28,7 @@ import java.util.List;
 public class OperatorQueryCondition extends QueryCondition {
 
     private final String operator;
-    private final QueryCondition child;
+    private QueryCondition child;
 
     public OperatorQueryCondition(String operator, QueryCondition child) {
         this.operator = operator;
@@ -66,4 +67,12 @@ public class OperatorQueryCondition extends QueryCondition {
     boolean containsTable(String... tables) {
         return child != null && child.containsTable(tables);
     }
+
+    @Override
+    public OperatorQueryCondition clone() {
+        OperatorQueryCondition clone = (OperatorQueryCondition) super.clone();
+        // deep clone ...
+        clone.child = ObjectUtil.clone(this.child);
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/OperatorSelectCondition.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 import com.mybatisflex.core.util.StringUtil;
 
 import java.util.List;
@@ -28,7 +29,7 @@ import java.util.List;
 public class OperatorSelectCondition extends QueryCondition {
     //操作符，例如 exist, not exist
     private final String operator;
-    private final QueryWrapper queryWrapper;
+    private QueryWrapper queryWrapper;
 
     public OperatorSelectCondition(String operator, QueryWrapper queryWrapper) {
         this.operator = operator;
@@ -69,4 +70,12 @@ public class OperatorSelectCondition extends QueryCondition {
         QueryCondition condition = queryWrapper.getWhereQueryCondition();
         return condition != null && condition.containsTable(tables);
     }
+
+    @Override
+    public OperatorSelectCondition clone() {
+        OperatorSelectCondition clone = (OperatorSelectCondition) super.clone();
+        // deep clone ...
+        clone.queryWrapper = ObjectUtil.clone(this.queryWrapper);
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryColumn.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -20,7 +20,6 @@ import com.mybatisflex.core.dialect.IDialect;
 import com.mybatisflex.core.table.TableDef;
 import com.mybatisflex.core.util.*;
 
-import java.io.Serializable;
 import java.util.Collection;
 import java.util.List;
 import java.util.function.Predicate;
@@ -28,7 +27,7 @@ import java.util.function.Predicate;
 /**
  * 查询列，描述的是一张表的字段
  */
-public class QueryColumn implements Serializable {
+public class QueryColumn implements CloneSupport<QueryColumn> {
 
     protected QueryTable table;
     protected String name;
@@ -546,4 +545,15 @@ public class QueryColumn implements Serializable {
     }
 
 
+    @Override
+    public QueryColumn clone() {
+        try {
+            QueryColumn clone = (QueryColumn) super.clone();
+            // deep clone ...
+            clone.table = ObjectUtil.clone(this.table);
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryCondition.java

@@ -1,31 +1,31 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 
 import com.mybatisflex.core.dialect.IDialect;
 import com.mybatisflex.core.util.ClassUtil;
+import com.mybatisflex.core.util.ObjectUtil;
 
-import java.io.Serializable;
 import java.lang.reflect.Array;
 import java.util.List;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 
-public class QueryCondition implements Serializable {
+public class QueryCondition implements CloneSupport<QueryCondition> {
 
     public static final String LOGIC_LIKE = "LIKE";
     public static final String LOGIC_GT = ">";
@@ -297,4 +297,22 @@ public class QueryCondition implements Serializable {
                 ", effective=" + effective +
                 '}';
     }
+
+    @Override
+    public QueryCondition clone() {
+        try {
+            QueryCondition clone = (QueryCondition) super.clone();
+            // deep clone ...
+            clone.column = ObjectUtil.clone(this.column);
+            clone.value = ObjectUtil.cloneObject(this.value);
+            clone.before = clone.next = null;
+            for (QueryCondition x = next; x != null; x = x.next) {
+                clone.next = x.clone();
+                clone.next.before = this;
+            }
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryOrderBy.java

@@ -1,30 +1,30 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 
-import java.io.Serializable;
 import java.util.List;
 
 /**
  * 排序字段
  */
-public class QueryOrderBy implements Serializable {
+public class QueryOrderBy implements CloneSupport<QueryOrderBy> {
 
     private QueryColumn queryColumn;
 
@@ -70,4 +70,16 @@ public class QueryOrderBy implements Serializable {
         }
         return sql;
     }
+
+    @Override
+    public QueryOrderBy clone() {
+        try {
+            QueryOrderBy clone = (QueryOrderBy) super.clone();
+            // deep clone ...
+            clone.queryColumn = ObjectUtil.clone(this.queryColumn);
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryTable.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -20,13 +20,12 @@ import com.mybatisflex.core.dialect.IDialect;
 import com.mybatisflex.core.table.TableDef;
 import com.mybatisflex.core.util.StringUtil;
 
-import java.io.Serializable;
 import java.util.Objects;
 
 /**
  * 查询列，描述的是一张表的字段
  */
-public class QueryTable implements Serializable {
+public class QueryTable implements CloneSupport<QueryTable> {
 
     protected String schema;
     protected String name;
@@ -81,10 +80,11 @@ public class QueryTable implements Serializable {
         if (table == null) {
             return false;
         }
-        if (StringUtil.isNotBlank(alias) && StringUtil.isNotBlank(table.alias)) {
-            if (Objects.equals(alias, table.alias)) {
+        if (StringUtil.isNotBlank(alias)
+                && StringUtil.isNotBlank(table.alias)
+                && (Objects.equals(alias, table.alias))) {
                 return false;
-            }
+
         }
         return Objects.equals(name, table.name);
     }
@@ -113,4 +113,13 @@ public class QueryTable implements Serializable {
                 ", alias='" + alias + '\'' +
                 '}';
     }
+
+    @Override
+    public QueryTable clone() {
+        try {
+            return (QueryTable) super.clone();
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryWrapper.java

@@ -657,4 +657,8 @@ public class QueryWrapper extends BaseQueryWrapper<QueryWrapper> {
     }
 
 
+    @Override
+    public QueryWrapper clone() {
+        return (QueryWrapper) super.clone();
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/RawFragment.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -58,6 +58,11 @@ public class RawFragment extends QueryCondition {
         return sql.toString();
     }
 
+    @Override
+    public RawFragment clone() {
+        return (RawFragment) super.clone();
+    }
+
 
     public String getContent() {
         return content;

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryColumn.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 import com.mybatisflex.core.util.SqlUtil;
 import com.mybatisflex.core.util.StringUtil;
 
@@ -49,6 +50,14 @@ public class SelectQueryColumn extends QueryColumn implements HasParamsColumn {
         return selectSql;
     }
 
+    @Override
+    public SelectQueryColumn clone() {
+        SelectQueryColumn clone = (SelectQueryColumn) super.clone();
+        // deep clone ...
+        clone.queryWrapper = ObjectUtil.clone(this.queryWrapper);
+        return clone;
+    }
+
     @Override
     String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
         return super.toConditionSql(queryTables, dialect);

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/SelectQueryTable.java

@@ -54,4 +54,12 @@ public class SelectQueryTable extends QueryTable {
             return "(" + sql + ")";
         }
     }
+
+    @Override
+    public SelectQueryTable clone() {
+        SelectQueryTable clone = (SelectQueryTable) super.clone();
+        // deep clone ...
+        clone.queryWrapper = this.queryWrapper.clone();
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringFunctionQueryColumn.java

@@ -1,21 +1,22 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.CollectionUtil;
 import com.mybatisflex.core.util.SqlUtil;
 import com.mybatisflex.core.util.StringUtil;
 
@@ -80,4 +81,12 @@ public class StringFunctionQueryColumn extends QueryColumn {
                 ", params=" + params +
                 '}';
     }
+
+    @Override
+    public StringFunctionQueryColumn clone() {
+        StringFunctionQueryColumn clone = (StringFunctionQueryColumn) super.clone();
+        // deep clone ...
+        clone.params = CollectionUtil.newArrayList(this.params);
+        return clone;
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringQueryColumn.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -48,4 +48,9 @@ public class StringQueryColumn extends QueryColumn {
                 "content='" + content + '\'' +
                 '}';
     }
+
+    @Override
+    public StringQueryColumn clone() {
+        return (StringQueryColumn) super.clone();
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/StringQueryOrderBy.java

@@ -1,17 +1,17 @@
-/**
- * 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.
+/*
+ *  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.query;
 
@@ -37,4 +37,9 @@ public class StringQueryOrderBy extends QueryOrderBy {
     public String toSql(List<QueryTable> queryTables, IDialect dialect) {
         return orderBy;
     }
+
+    @Override
+    public StringQueryOrderBy clone() {
+        return (StringQueryOrderBy) super.clone();
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/query/UnionWrapper.java

@@ -1,23 +1,24 @@
-/**
- * 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.
+/*
+ *  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.query;
 
 import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.util.ObjectUtil;
 
-public class UnionWrapper {
+public class UnionWrapper implements CloneSupport<UnionWrapper> {
 
     private String key;
     private QueryWrapper queryWrapper;
@@ -59,4 +60,16 @@ public class UnionWrapper {
     public void buildSql(StringBuilder sqlBuilder, IDialect dialect) {
         sqlBuilder.append(key).append("(").append(dialect.buildSelectSql(queryWrapper)).append(")");
     }
+
+    @Override
+    public UnionWrapper clone() {
+        try {
+            UnionWrapper clone = (UnionWrapper) super.clone();
+            // deep clone ...
+            clone.queryWrapper = ObjectUtil.clone(this.queryWrapper);
+            return clone;
+        } catch (CloneNotSupportedException e) {
+            throw new AssertionError();
+        }
+    }
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/util/CollectionUtil.java

@@ -15,8 +15,12 @@
  */
 package com.mybatisflex.core.util;
 
+import com.mybatisflex.core.query.CloneSupport;
+
 import java.util.*;
 import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
 
 
 public class CollectionUtil {
@@ -105,4 +109,30 @@ public class CollectionUtil {
         return results;
     }
 
+    @SuppressWarnings("all")
+    public static <E extends CloneSupport<E>> List<E> cloneValue(Collection<E> collection, Supplier<List<E>> collectionSupplier) {
+        if (isEmpty(collection)) {
+            return collectionSupplier.get();
+        }
+        return collection.stream()
+                // 这里不能使用 CloneSupport::clone
+                // java.lang.BootstrapMethodError: call site initialization exception
+                .map(cloneable -> cloneable.clone())
+                .collect(Collectors.toCollection(collectionSupplier));
+    }
+
+    public static <E> ArrayList<E> newArrayList(Collection<E> collection) {
+        if (isEmpty(collection)) {
+            return new ArrayList<>();
+        }
+        return new ArrayList<>(collection);
+    }
+
+    public static <K, V> HashMap<K, V> newHashMap(Map<K, V> map) {
+        if (map == null || map.isEmpty()) {
+            return new HashMap<>();
+        }
+        return new HashMap<>(map);
+    }
+
 }

mybatis-flex-core/src/main/java/com/mybatisflex/core/util/ObjectUtil.java

@@ -15,12 +15,28 @@
  */
 package com.mybatisflex.core.util;
 
+import com.mybatisflex.core.query.CloneSupport;
+
 import java.util.Objects;
 
 public class ObjectUtil {
 
     private ObjectUtil() {}
 
+    public static Object cloneObject(Object value) {
+        if (value instanceof CloneSupport) {
+            return ((CloneSupport<?>) value).clone();
+        }
+        return value;
+    }
+
+    public static <T extends CloneSupport<T>> T clone(T value) {
+        if (value != null) {
+            return value.clone();
+        }
+        return null;
+    }
+
     public static <T> T requireNonNullElse(T t1, T t2) {
         return t1 == null ? t2 : t1;
     }