test: 测试 IF 函数。

mybatis-flex-core/src/test/java/com/mybatisflex/coretest/IfFunctionTest.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.QueryWrapper;
+import org.junit.Test;
+
+import static com.mybatisflex.core.query.QueryMethods.if_;
+import static com.mybatisflex.core.query.QueryMethods.string;
+import static com.mybatisflex.coretest.table.AccountTableDef.ACCOUNT;
+
+/**
+ * @author 王帅
+ * @since 2023-07-07
+ */
+public class IfFunctionTest {
+
+    @Test
+    public void test01() {
+        QueryWrapper queryWrapper = QueryWrapper.create()
+                .select(if_(ACCOUNT.AGE.ge(6), ACCOUNT.IS_NORMAL, ACCOUNT.IS_DELETE).as("type"))
+                .from(ACCOUNT)
+                .where(ACCOUNT.ID.eq(1));
+        System.out.println(queryWrapper.toSQL());
+    }
+
+    @Test
+    public void test02() {
+        QueryWrapper queryWrapper = QueryWrapper.create()
+                .select(if_(ACCOUNT.AGE.ge(18), string("成年人"),
+                        if_(ACCOUNT.AGE.le(8), string("未上学"), string("已上学"))).as("type"))
+                .from(ACCOUNT)
+                .where(ACCOUNT.ID.eq(1));
+        System.out.println(queryWrapper.toSQL());
+    }
+
+}