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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 2009-2023 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
 *
 *       https://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.mapping;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.Map;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;

/**
 * Vendor DatabaseId provider.
 * 

* It returns database product name as a databaseId. If the user provides a properties it uses it to translate database * product name key="Microsoft SQL Server", value="ms" will return "ms". It can return null, if no database product name * or a properties was specified and no translation was found. * * @author Eduardo Macarron */ public class VendorDatabaseIdProvider implements DatabaseIdProvider { private Properties properties; @Override public String getDatabaseId(DataSource dataSource) { if (dataSource == null) { throw new NullPointerException("dataSource cannot be null"); } try { return getDatabaseName(dataSource); } catch (Exception e) { LogHolder.log.error("Could not get a databaseId from dataSource", e); } return null; } @Override public void setProperties(Properties p) { this.properties = p; } private String getDatabaseName(DataSource dataSource) throws SQLException { String productName = getDatabaseProductName(dataSource); if (this.properties != null) { for (Map.Entry property : properties.entrySet()) { if (productName.contains((String) property.getKey())) { return (String) property.getValue(); } } // no match, return null return null; } return productName; } private String getDatabaseProductName(DataSource dataSource) throws SQLException { try (Connection con = dataSource.getConnection()) { DatabaseMetaData metaData = con.getMetaData(); return metaData.getDatabaseProductName(); } } private static class LogHolder { private static final Log log = LogFactory.getLog(VendorDatabaseIdProvider.class); } }





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