test: 测试 FunctionQueryColumn 构建函数。

mybatis-flex-core/src/test/java/com/mybatisflex/coretest/FunctionSqlTest.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.coretest;
+
+import com.mybatisflex.core.query.FunctionQueryColumn;
+import com.mybatisflex.core.query.QueryWrapper;
+import com.mybatisflex.core.query.StringQueryColumn;
+import org.junit.Test;
+
+import static com.mybatisflex.coretest.table.AccountTableDef.ACCOUNT;
+
+/**
+ * @author 王帅
+ * @since 2023-06-28
+ */
+public class FunctionSqlTest {
+
+    @Test
+    public void test() {
+        String sql = QueryWrapper.create()
+                .select(new FunctionQueryColumn("NOW").as("n1"))
+                .select(new FunctionQueryColumn("NOW", new StringQueryColumn("")).as("n2"))
+                .select(new FunctionQueryColumn("CONCAT", ACCOUNT.USER_NAME, ACCOUNT.AGE).as("c1"))
+                .from(ACCOUNT)
+                .toSQL();
+        System.out.println(sql);
+    }
+
+}