Add a new property skipSetAutoCommitOnClose to JdbcTransactionFactory

Sample configuration:

```xml
<transactionManager type="JDBC">
  <property name="skipSetAutoCommitOnClose" value="true"/>
</transactionManager>
```

- Enabling this switch skips `setAutoCommit(true)` call when closing the transaction.
- Enabling this switch may improve performance with some drivers (e.g. mysql-connector-java, mssql-jdbc), but not others (e.g. Oracle).
- Enabling this switch may cause exception with some drivers (e.g. Derby).

Should fix mybatis#2426

TODO: docs

Author: harawata

src/main/java/org/apache/ibatis/transaction/jdbc/JdbcTransaction.java

@@ -44,11 +44,17 @@ public class JdbcTransaction implements Transaction {
   protected DataSource dataSource;
   protected TransactionIsolationLevel level;
   protected boolean autoCommit;
+  protected boolean skipSetAutoCommitOnClose;
 
   public JdbcTransaction(DataSource ds, TransactionIsolationLevel desiredLevel, boolean desiredAutoCommit) {
+    this(ds, desiredLevel, desiredAutoCommit, false);
+  }
+
+  public JdbcTransaction(DataSource ds, TransactionIsolationLevel desiredLevel, boolean desiredAutoCommit, boolean skipSetAutoCommitOnClose) {
     dataSource = ds;
     level = desiredLevel;
     autoCommit = desiredAutoCommit;
+    this.skipSetAutoCommitOnClose = skipSetAutoCommitOnClose;
   }
 
   public JdbcTransaction(Connection connection) {
@@ -113,7 +119,7 @@ protected void setDesiredAutoCommit(boolean desiredAutoCommit) {
 
   protected void resetAutoCommit() {
     try {
-      if (!connection.getAutoCommit()) {
+      if (!skipSetAutoCommitOnClose && !connection.getAutoCommit()) {
         // MyBatis does not call commit/rollback on a connection if just selects were performed.
         // Some databases start transactions with select statements
         // and they mandate a commit/rollback before closing the connection.

src/main/java/org/apache/ibatis/transaction/jdbc/JdbcTransactionFactory.java

@@ -16,6 +16,7 @@
 package org.apache.ibatis.transaction.jdbc;
 
 import java.sql.Connection;
+import java.util.Properties;
 
 import javax.sql.DataSource;
 
@@ -32,13 +33,26 @@
  */
 public class JdbcTransactionFactory implements TransactionFactory {
 
+  private boolean skipSetAutoCommitOnClose;
+
+  @Override
+  public void setProperties(Properties props) {
+    if (props == null) {
+      return;
+    }
+    String value = props.getProperty("skipSetAutoCommitOnClose");
+    if (value != null) {
+      skipSetAutoCommitOnClose = Boolean.parseBoolean(value);
+    }
+  }
+
   @Override
   public Transaction newTransaction(Connection conn) {
     return new JdbcTransaction(conn);
   }
 
   @Override
   public Transaction newTransaction(DataSource ds, TransactionIsolationLevel level, boolean autoCommit) {
-    return new JdbcTransaction(ds, level, autoCommit);
+    return new JdbcTransaction(ds, level, autoCommit, skipSetAutoCommitOnClose);
   }
 }