From 206f4a080b1a0138802baf8435dc2e13b7fc4ecd Mon Sep 17 00:00:00 2001
From: Suomm <1474983351@qq.com>
Date: Sun, 30 Jul 2023 17:16:00 +0800
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---
 .../NullableColumnLogicDeleteProcessor.java   | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 mybatis-flex-core/src/main/java/com/mybatisflex/core/logicdelete/NullableColumnLogicDeleteProcessor.java

diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/logicdelete/NullableColumnLogicDeleteProcessor.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/logicdelete/NullableColumnLogicDeleteProcessor.java
new file mode 100644
index 00000000..8a9a0bfa
--- /dev/null
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/logicdelete/NullableColumnLogicDeleteProcessor.java
@@ -0,0 +1,51 @@
+/*
+ *  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.logicdelete;
+
+import com.mybatisflex.core.dialect.IDialect;
+import com.mybatisflex.core.query.QueryColumn;
+import com.mybatisflex.core.query.QueryWrapper;
+import com.mybatisflex.core.table.TableInfo;
+
+/**
+ * 数据列默认值为 {@code null} 值的逻辑删除处理器。
+ *
+ * @author 王帅
+ * @since 2023-07-30
+ */
+public abstract class NullableColumnLogicDeleteProcessor extends AbstractLogicDeleteProcessor {
+
+    @Override
+    public String buildLogicNormalCondition(String logicColumn, TableInfo tableInfo, IDialect dialect) {
+        return dialect.wrap(logicColumn) + " IS NULL";
+    }
+
+    @Override
+    public void buildQueryCondition(QueryWrapper queryWrapper, TableInfo tableInfo) {
+        QueryColumn queryColumn = new QueryColumn(tableInfo.getSchema(), tableInfo.getTableName(), tableInfo.getLogicDeleteColumn());
+        queryWrapper.and(queryColumn.isNull());
+    }
+
+    /**
+     * 逻辑删除字段值为 {@code null} 表示数据未删除。
+     */
+    @Override
+    public Object getLogicNormalValue() {
+        return null;
+    }
+
+}