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The MyBatis SQL mapper framework makes it easier to use a relational database with object-oriented applications. MyBatis couples objects with stored procedures or SQL statements using a XML descriptor or annotations. Simplicity is the biggest advantage of the MyBatis data mapper over object relational mapping tools.
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/**
 *    Copyright 2009-2017 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.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    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 org.apache.ibatis.session.defaults;

import java.sql.Connection;
import java.sql.SQLException;

import org.apache.ibatis.exceptions.ExceptionFactory;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.features.jpa.ddl.SchemaExport;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.TransactionIsolationLevel;
import org.apache.ibatis.transaction.Transaction;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.managed.ManagedTransactionFactory;

/**
 * @author Clinton Begin
 */
public class DefaultSqlSessionFactory implements SqlSessionFactory {

    private final Configuration configuration;

    public DefaultSqlSessionFactory(Configuration configuration) {
        this.configuration = configuration;
    }

    public DefaultSqlSessionFactory(Configuration configuration, boolean printDDL, boolean executeDDL) {
        this.configuration = configuration;
        new SchemaExport().export(configuration.getEnvironment().getDataSource(), printDDL, executeDDL);
    }

    @Override
    public SqlSession openSession() {
        return openSessionFromDataSource(configuration.getDefaultExecutorType(), null, false);
    }

    @Override
    public SqlSession openSession(boolean autoCommit) {
        return openSessionFromDataSource(configuration.getDefaultExecutorType(), null, autoCommit);
    }

    @Override
    public SqlSession openSession(ExecutorType execType) {
        return openSessionFromDataSource(execType, null, false);
    }

    @Override
    public SqlSession openSession(TransactionIsolationLevel level) {
        return openSessionFromDataSource(configuration.getDefaultExecutorType(), level, false);
    }

    @Override
    public SqlSession openSession(ExecutorType execType, TransactionIsolationLevel level) {
        return openSessionFromDataSource(execType, level, false);
    }

    @Override
    public SqlSession openSession(ExecutorType execType, boolean autoCommit) {
        return openSessionFromDataSource(execType, null, autoCommit);
    }

    @Override
    public SqlSession openSession(Connection connection) {
        return openSessionFromConnection(configuration.getDefaultExecutorType(), connection);
    }

    @Override
    public SqlSession openSession(ExecutorType execType, Connection connection) {
        return openSessionFromConnection(execType, connection);
    }

    @Override
    public Configuration getConfiguration() {
        return configuration;
    }

    private SqlSession openSessionFromDataSource(ExecutorType execType, TransactionIsolationLevel level, boolean autoCommit) {
        Transaction tx = null;
        try {
            final Environment environment = configuration.getEnvironment();
            final TransactionFactory transactionFactory = getTransactionFactoryFromEnvironment(environment);
            tx = transactionFactory.newTransaction(environment.getDataSource(), level, autoCommit);
            final Executor executor = configuration.newExecutor(tx, execType);
            return new DefaultSqlSession(configuration, executor, autoCommit);
        } catch (Exception e) {
            closeTransaction(tx); // may have fetched a connection so lets call close()
            throw ExceptionFactory.wrapException("Error opening session.  Cause: " + e, e);
        } finally {
            ErrorContext.instance().reset();
        }
    }

    private SqlSession openSessionFromConnection(ExecutorType execType, Connection connection) {
        try {
            boolean autoCommit;
            try {
                autoCommit = connection.getAutoCommit();
            } catch (SQLException e) {
                // Failover to true, as most poor drivers
                // or databases won't support transactions
                autoCommit = true;
            }
            final Environment environment = configuration.getEnvironment();
            final TransactionFactory transactionFactory = getTransactionFactoryFromEnvironment(environment);
            final Transaction tx = transactionFactory.newTransaction(connection);
            final Executor executor = configuration.newExecutor(tx, execType);
            return new DefaultSqlSession(configuration, executor, autoCommit);
        } catch (Exception e) {
            throw ExceptionFactory.wrapException("Error opening session.  Cause: " + e, e);
        } finally {
            ErrorContext.instance().reset();
        }
    }

    private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
        if (environment == null || environment.getTransactionFactory() == null) {
            return new ManagedTransactionFactory();
        }
        return environment.getTransactionFactory();
    }

    private void closeTransaction(Transaction tx) {
        if (tx != null) {
            try {
                tx.close();
            } catch (SQLException ignore) {
                // Intentionally ignore. Prefer previous error.
            }
        }
    }

}