Merge pull request #1973 from maltalex/master

Added SQL_SERVER_SNAPSHOT value to TransactionIsolationLevel enum

src/main/java/org/apache/ibatis/session/TransactionIsolationLevel.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2018 the original author or authors.
+ *    Copyright 2009-2020 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.
@@ -25,7 +25,14 @@ public enum TransactionIsolationLevel {
   READ_COMMITTED(Connection.TRANSACTION_READ_COMMITTED),
   READ_UNCOMMITTED(Connection.TRANSACTION_READ_UNCOMMITTED),
   REPEATABLE_READ(Connection.TRANSACTION_REPEATABLE_READ),
-  SERIALIZABLE(Connection.TRANSACTION_SERIALIZABLE);
+  SERIALIZABLE(Connection.TRANSACTION_SERIALIZABLE),
+  /**
+   * A non-standard isolation level for Microsoft SQL Server.
+   * Defined in the SQL Server JDBC driver {@link com.microsoft.sqlserver.jdbc.ISQLServerConnection}
+   *
+   * @since 3.5.6
+   */
+  SQL_SERVER_SNAPSHOT(0x1000);
 
   private final int level;