test: 克隆测试以及效率对比。

mybatis-flex-test/mybatis-flex-spring-boot-test/src/test/java/com/mybatisflex/test/common/CloneTest.java

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+/*
+ *  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.common;
+
+import com.mybatisflex.core.query.QueryWrapper;
+import com.mybatisflex.core.util.SerialUtil;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.function.Supplier;
+
+import static com.mybatisflex.core.query.QueryMethods.case_;
+import static com.mybatisflex.core.query.QueryMethods.distinct;
+import static com.mybatisflex.test.model.table.RoleTableDef.ROLE;
+import static com.mybatisflex.test.model.table.UserRoleTableDef.USER_ROLE;
+import static com.mybatisflex.test.model.table.UserTableDef.USER;
+
+/**
+ * @author 王帅
+ * @since 2023-06-09
+ */
+class CloneTest {
+
+    @Test
+    void test() {
+        QueryWrapper queryWrapper = newQueryWrapper();
+        int count = 1_000;
+
+        /*
+         * new: 11ms
+         * clone: 30ms
+         * serial: 467ms
+         */
+        calcTime(count, "new", this::newQueryWrapper);
+        calcTime(count, "clone", queryWrapper::clone);
+        calcTime(count, "serial",() -> SerialUtil.cloneObject(queryWrapper));
+    }
+
+    @Test
+    void test02() {
+        QueryWrapper queryWrapper = newQueryWrapper();
+        QueryWrapper queryWrapper1 = queryWrapper.clone();
+        QueryWrapper queryWrapper2 = SerialUtil.cloneObject(queryWrapper);
+        System.out.println(queryWrapper.toSQL());
+        System.out.println(queryWrapper1.toSQL());
+        System.out.println(queryWrapper2.toSQL());
+    }
+
+    private void calcTime(int count, String type, Supplier<QueryWrapper> supplier) {
+        long start = System.currentTimeMillis();
+        for (int i = 0; i < count; i++) {
+            supplier.get();
+        }
+        long end = System.currentTimeMillis();
+        System.out.println(type + ": " + (end - start) + "ms");
+    }
+
+    private QueryWrapper newQueryWrapper() {
+        return QueryWrapper.create()
+                .select(case_().when(USER.USER_ID.eq(3)).then("x3").end(),
+                        distinct(USER.USER_ID.add(4)),
+                        USER.USER_NAME,
+                        ROLE.ALL_COLUMNS)
+                .from(USER.as("u"))
+                .leftJoin(USER_ROLE).as("ur").on(USER_ROLE.USER_ID.eq(USER.USER_ID))
+                .leftJoin(ROLE).as("r").on(USER_ROLE.ROLE_ID.eq(ROLE.ROLE_ID))
+                .where(USER.USER_ID.eq(3))
+                .and(ROLE.ROLE_NAME.in(Arrays.asList(1, 2, 3)))
+                .groupBy(ROLE.ROLE_NAME)
+                .having(ROLE.ROLE_ID.ge(7))
+                .orderBy(ROLE.ROLE_NAME.asc());
+    }
+
+}