src/main/java/com/itfsw/mybatis/generator/plugins/utils/XmlElementGeneratorTools.java
public static Element getSelectKey(IntrospectedColumn introspectedColumn, GeneratedKey generatedKey) {
        return getSelectKey(introspectedColumn, generatedKey, null);
    }
public static Element getSelectKey(IntrospectedColumn introspectedColumn, GeneratedKey generatedKey) {
        return getSelectKey(introspectedColumn, generatedKey, null);
    }
This method should return an XmlElement for the select key used to
automatically generate keys.
@param introspectedColumn the column related to the select key statement
@param generatedKey       the generated key for the current table
@return the selectKey element