Add ValueOrNull mapping to GeneralInsertDSL

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/insert/GeneralInsertDSL.java

@@ -1,5 +1,5 @@
 /*
- *    Copyright 2016-2020 the original author or authors.
+ *    Copyright 2016-2021 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@
 import org.mybatis.dynamic.sql.util.NullMapping;
 import org.mybatis.dynamic.sql.util.StringConstantMapping;
 import org.mybatis.dynamic.sql.util.ValueMapping;
+import org.mybatis.dynamic.sql.util.ValueOrNullMapping;
 import org.mybatis.dynamic.sql.util.ValueWhenPresentMapping;
 
 public class GeneralInsertDSL implements Buildable<GeneralInsertModel> {
@@ -88,6 +89,15 @@ public GeneralInsertDSL toValue(Supplier<T> valueSupplier) {
             return GeneralInsertDSL.this;
         }
 
+        public GeneralInsertDSL toValueOrNull(T value) {
+            return toValueOrNull(() -> value);
+        }
+
+        public GeneralInsertDSL toValueOrNull(Supplier<T> valueSupplier) {
+            insertMappings.add(ValueOrNullMapping.of(column, valueSupplier));
+            return GeneralInsertDSL.this;
+        }
+
         public GeneralInsertDSL toValueWhenPresent(T value) {
             return toValueWhenPresent(() -> value);
         }