Mybatis 分多个配置文, 重写org.mybatis.spring.SqlSessionFactoryBean支持多个mybatis-config.xml...

最新推荐文章于 2021-11-20 22:47:15 发布

wu1g119

最新推荐文章于 2021-11-20 22:47:15 发布

阅读量1.6k

点赞数

CC 4.0 BY-SA版权

分类专栏： mybatis 文章标签： java php

本文链接：https://blog.youkuaiyun.com/wu1g119/article/details/84709009

mybatis 专栏收录该内容

2 篇文章

订阅专栏

本文详细介绍了如何在MyBatis中整合多个配置文件，以支持不同功能模块使用各自的配置，减少代码检索时间和维护成本。通过自定义SqlSessionFactoryBean类，实现了从多个指定路径加载配置文件，并合并其内容，包括settings、typeAliases、plugins和mappers等部分。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

现有版本的mybatis不支持多个mybatis-config.xml配置文件,但是实际应用中开发者希望它能与spring或struts一样支持多个配置文件,不同功能模块使用不同的配置文件以减少开发中代码检索的时间与维护成本.

下面,是我根据网上资料结合自己实际遇到的问题重写的

参考资料 http://www.xinglongjian.com/index.php/2012/09/15/mybatismanyconfig/

上面的链接中只合并了 typeAliases与mappers

但是我们实际的配置文件可能还包含 mybatis配置settings,mybatis插件plugins 至少我的项目需要这两项

spring中配置

<bean id="sqlSessionFactory_db1" class="cn.com.softvan.dao.utils.MySqlSessionFactoryBean">
		<property name="configLocationX" value="classpath*:config/mybatis/mybatis-config*.xml" />
		<property name="dataSource" ref="dataSource_db1" />
</bean>

具体类

package cn.com.softvan.dao.utils;

import static org.springframework.util.Assert.notNull;
import static org.springframework.util.ObjectUtils.isEmpty;
import static org.springframework.util.StringUtils.hasLength;
import static org.springframework.util.StringUtils.tokenizeToStringArray;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

import javax.sql.DataSource;

import org.apache.ibatis.builder.xml.XMLConfigBuilder;
import org.apache.ibatis.builder.xml.XMLMapperBuilder;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.mapping.DatabaseIdProvider;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.mapping.VendorDatabaseIdProvider;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.type.TypeHandler;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentFactory;
import org.dom4j.DocumentHelper;
import org.dom4j.DocumentType;
import org.dom4j.Element;
import org.dom4j.ElementHandler;
import org.dom4j.ElementPath;
import org.dom4j.io.SAXReader;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.NestedIOException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import com.sun.beans.decoder.ValueObject;

public class MySqlSessionFactoryBean extends	org.mybatis.spring.SqlSessionFactoryBean {
	private static final Log logger = LogFactory.getLog(MySqlSessionFactoryBean.class);
	private SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
	private Interceptor[] plugins;
	private Class<?>[] typeAliases;
	private String typeAliasesPackage;
	private TypeHandler<?>[] typeHandlers;
	private String typeHandlersPackage;
	private TransactionFactory transactionFactory;
	private Properties configurationProperties;
	private Resource[] configLocations;
	private DataSource dataSource;
	private String environment = SqlSessionFactoryBean.class.getSimpleName();
	private DatabaseIdProvider databaseIdProvider = new VendorDatabaseIdProvider();
	private Resource[] mapperLocations;
	private SqlSessionFactory sqlSessionFactory;
	//-settings 是否获取标记--防止多次获取--
	private boolean settings_flag=true;
	//-plugins 是否获取标记--防止多次获取--
	private boolean plugins_flag=true;
	/* 修改该方法 */
	public void setConfigLocation(Resource configLocation) {
		this.configLocations = configLocation != null ? new Resource[] { configLocation } : null;
	}
	/* 增加该方法 */
	public void setConfigLocationX(String filePath) {
		 try {
			ResourcePatternResolver resolver = (ResourcePatternResolver) new PathMatchingResourcePatternResolver();  
			//将加载多个模式匹配的Resource  
            Resource[] resources = (Resource[]) resolver.getResources(filePath);  
            configLocations=resources;
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (logger.isDebugEnabled()) {
			if(configLocations!=null){
				for(Resource resource:configLocations){
					logger.debug("==================================="+resource);
				}
			}
		}
	}
	/**
	 * 合并mybatis配置文件
	 */
	public Document SQLConfigMap() {
		Document doc = DocumentHelper.createDocument();
		doc.setXMLEncoding("UTF-8");
		DocumentFactory documentFactory = new DocumentFactory();
		DocumentType docType = documentFactory.createDocType("configuration", "-//mybatis.org//DTD Config 3.0//EN", "http://mybatis.org/dtd/mybatis-3-config.dtd");
		doc.setDocType(docType);
		Element rootElement = doc.addElement("configuration");
		rootElement.addElement("settings");
		rootElement.addElement("typeAliases");
		rootElement.addElement("plugins");
		rootElement.addElement("mappers");
		return doc;
	}

	public void readXML(Resource configXML,
			final Element elementSettings,
			final Element elementTypeAlias,
			final Element elementPlugins,
			final Element elementMapper) {
		SAXReader saxReader = new SAXReader();
		saxReader.setEntityResolver(new EntityResolver() {
			@Override
			public InputSource resolveEntity(String publicId, String systemId)
					throws SAXException, IOException {
				String jarPath = SqlSessionFactory.class.getProtectionDomain()
						.getCodeSource().getLocation().getPath();
				String filePath = "org/apache/ibatis/builder/xml/mybatis-3-config.dtd";
				InputStream jarIn = null;
				try {
					JarFile jarFile = new JarFile(jarPath);
					JarEntry jarEntry = jarFile.getJarEntry(filePath);
					jarIn = jarFile.getInputStream(jarEntry);
				} catch (IOException e) {
					e.printStackTrace();
				}
				return new InputSource(jarIn);
			}
		});
		/* settings 获取*/
		saxReader.addHandler("/configuration/settings/setting",
				new ElementHandler() {
					public void onEnd(ElementPath path) {
						if(settings_flag){
							//System.out.println("settings 获取---"+path.getPath());
							Element row = path.getCurrent();
							Element els = elementSettings.addElement("setting");
							els.addAttribute("name", row.attributeValue("name"))
							   .addAttribute("value", row.attributeValue("value"));
							row.detach();
						}
					}

					public void onStart(ElementPath arg0) {
					}
				});
		/* typeAliases合并 */
		saxReader.addHandler("/configuration/typeAliases/typeAlias",
				new ElementHandler() {
					public void onEnd(ElementPath path) {
						Element row = path.getCurrent();
						Element els = elementTypeAlias.addElement("typeAlias");
						els.addAttribute("alias", row.attributeValue("alias"))
								.addAttribute("type",row.attributeValue("type"));
						row.detach();
					}

					public void onStart(ElementPath arg0) {
					}
				});
		/* plugins合并 */
		saxReader.addHandler("/configuration/plugins/plugin",
				new ElementHandler() {
					public void onEnd(ElementPath path) {
						if(plugins_flag){
							//System.out.println("plugins 获取---"+path.getPath());
							Element row = path.getCurrent();
							Element els = elementPlugins.addElement("plugin");
							els.addAttribute("interceptor", row.attributeValue("interceptor"));
							//child
//							System.out.println("xxxx=====xxx=="+row.elements().size());
							if(row.elements()!=null){
								Iterator iter=row.elementIterator();
								while(iter.hasNext()){
									Element oldels=(Element) iter.next();
									Element els_property=els.addElement("property");
									els_property.addAttribute("name", oldels.attributeValue("name"))
												.addAttribute("value", oldels.attributeValue("value"));
								}
								
							}
							row.detach();
						}
					}

					public void onStart(ElementPath arg0) {
					}
				});
		/* mapper合并 */
		saxReader.addHandler("/configuration/mappers/mapper",
				new ElementHandler() {
					public void onEnd(ElementPath path) {
						Element row = path.getCurrent();
						Element els = elementMapper.addElement("mapper");
						String mapper = row.attributeValue("mapper");
						String resource = row.attributeValue("resource");
						els.addAttribute("mapper", mapper);
						els.addAttribute("resource", resource);
						row.detach();
					}

					public void onStart(ElementPath arg0) {

					}
				});

		try {
			saxReader.read(configXML.getInputStream());
		} catch (DocumentException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * @return SqlSessionFactory
	 * @throws IOException
	 */
	protected SqlSessionFactory buildSqlSessionFactory() throws IOException {
		Configuration configuration = null;
		XMLConfigBuilder xmlConfigBuilder = null;
		Document document = this.SQLConfigMap();
		Element root = document.getRootElement();
		Element elementSettings = root.element("settings");
		Element elementTypeAlias = root.element("typeAliases");
		Element elementPlugins = root.element("plugins");
		Element elementMapper = root.element("mappers");
		for (Resource configLocation : configLocations) {
			readXML(configLocation,elementSettings, elementTypeAlias,elementPlugins, elementMapper);
			settings_flag=false;
			plugins_flag=false;
		}
		// Reader reader = null; InputStream inputStream = null;
		if (this.configLocations != null) {
			//--打印合并后的xml配置
			logger.debug("xml="+document.asXML());
			InputStream inputSteam = new ByteArrayInputStream(document.asXML().getBytes());
			xmlConfigBuilder = new XMLConfigBuilder(inputSteam, null,
					this.configurationProperties);
			configuration = xmlConfigBuilder.getConfiguration();
			if (inputSteam != null) {
				inputSteam.close();
				inputSteam = null;
			}
			document = null;
		} else {
			if (logger.isDebugEnabled()) {
				logger.debug("Property 'configLocation' not specified,using default MyBatis Configuration");
			}
			configuration = new Configuration();
			configuration.setVariables(this.configurationProperties);
		}

		if (hasLength(this.typeAliasesPackage)) {
			String[] typeAliasPackageArray = tokenizeToStringArray( this.typeAliasesPackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
			for (String packageToScan : typeAliasPackageArray) {
				configuration.getTypeAliasRegistry().registerAliases(packageToScan);
				if (logger.isDebugEnabled()) {
					logger.debug("Scanned package: '" + packageToScan + "' for aliases");
				}
			}
		}
		if (!isEmpty(this.typeAliases)) {
			for (Class<?> typeAlias : this.typeAliases) {
				configuration.getTypeAliasRegistry().registerAlias(typeAlias);
				if (logger.isDebugEnabled()) {
					logger.debug("Registered type alias: '" + typeAlias + "'");
				}
			}
		}

		if (!isEmpty(this.plugins)) {
			for (Interceptor plugin : this.plugins) {
				configuration.addInterceptor(plugin);
				if (logger.isDebugEnabled()) {
					logger.debug("Registered plugin: '" + plugin + "'");
				}
			}
		}

		if (hasLength(this.typeHandlersPackage)) {
			String[] typeHandlersPackageArray = tokenizeToStringArray( this.typeHandlersPackage, ConfigurableApplicationContext.CONFIG_LOCATION_DELIMITERS);
			for (String packageToScan : typeHandlersPackageArray) {
				configuration.getTypeHandlerRegistry().register(packageToScan);
				if (logger.isDebugEnabled()) {
					logger.debug("Scanned package: '" + packageToScan + "' for type handlers");
				}
			}
		}

		if (!isEmpty(this.typeHandlers)) {
			for (TypeHandler<?> typeHandler : this.typeHandlers) {
				configuration.getTypeHandlerRegistry().register(typeHandler);
				if (logger.isDebugEnabled()) {
					logger.debug("Registered type handler: '" + typeHandler + "'");
				}
			}
		}

		if (xmlConfigBuilder != null) {
			try {
				xmlConfigBuilder.parse();
				if (logger.isDebugEnabled()) {
					logger.debug("Parsed configuration file: '" + this.configLocations + "'");
				}
			} catch (Exception ex) {
				throw new NestedIOException("Failed to parse config resource: " + this.configLocations, ex);
			} finally {
				ErrorContext.instance().reset();
			}
		}

		if (this.transactionFactory == null) {
			this.transactionFactory = new SpringManagedTransactionFactory();
		}

		Environment environment = new Environment(this.environment, this.transactionFactory, this.dataSource);
		configuration.setEnvironment(environment);

		if (this.databaseIdProvider != null) {
			try {
				configuration.setDatabaseId(this.databaseIdProvider.getDatabaseId(this.dataSource));
			} catch (SQLException e) {
				throw new NestedIOException("Failed getting a databaseId", e);
			}
		}

		if (!isEmpty(this.mapperLocations)) {
			for (Resource mapperLocation : this.mapperLocations) {
				if (mapperLocation == null) {
					continue;
				}

				try {
					XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(
							mapperLocation.getInputStream(), configuration,
							mapperLocation.toString(),
							configuration.getSqlFragments());
					xmlMapperBuilder.parse();
				} catch (Exception e) {
					throw new NestedIOException(
							"Failed to parse mapping resource: '" + mapperLocation + "'", e);
				} finally {
					ErrorContext.instance().reset();
				}

				if (logger.isDebugEnabled()) {
					logger.debug("Parsed mapper file: '" + mapperLocation + "'");
				}
			}
		} else {
			if (logger.isDebugEnabled()) {
				logger.debug("Property 'mapperLocations' was not specified or no matching resources found");
			}
		}
		return this.sqlSessionFactoryBuilder.build(configuration);
	}

	public void afterPropertiesSet() throws Exception {
		notNull(dataSource, "Property 'dataSource' is required");
		notNull(sqlSessionFactoryBuilder,"Property 'sqlSessionFactoryBuilder' is required");
		this.sqlSessionFactory = buildSqlSessionFactory();
	}

	public SqlSessionFactory getObject() throws Exception {
		if (this.sqlSessionFactory == null) {
			afterPropertiesSet();
		}
		return this.sqlSessionFactory;
	}
	
	/*
	 * public Class<? extends SqlSessionFactory> getObjectType() { return
	 * this.sqlSessionFactory == null ? SqlSessionFactory.class :
	 * this.sqlSessionFactory.getClass(); }
	 * 
	 * public void onApplicationEvent(ApplicationEvent event) { if (failFast &&
	 * event instanceof ContextRefreshedEvent) { // fail-fast -> check all
	 * statements are completed
	 * this.sqlSessionFactory.getConfiguration().getMappedStatementNames(); } }
	 */
	public SqlSessionFactoryBuilder getSqlSessionFactoryBuilder() {
		return sqlSessionFactoryBuilder;
	}

	public void setSqlSessionFactoryBuilder(
			SqlSessionFactoryBuilder sqlSessionFactoryBuilder) {
		this.sqlSessionFactoryBuilder = sqlSessionFactoryBuilder;
	}

	public void setPlugins(Interceptor[] plugins) {
		this.plugins = plugins;
	}

	public void setTypeAliases(Class<?>[] typeAliases) {
		this.typeAliases = typeAliases;
	}

	public void setTypeAliasesPackage(String typeAliasesPackage) {
		this.typeAliasesPackage = typeAliasesPackage;
	}

	public void setTypeHandlers(TypeHandler<?>[] typeHandlers) {
		this.typeHandlers = typeHandlers;
	}

	public void setTypeHandlersPackage(String typeHandlersPackage) {
		this.typeHandlersPackage = typeHandlersPackage;
	}

	public void setTransactionFactory(TransactionFactory transactionFactory) {
		this.transactionFactory = transactionFactory;
	}

	public void setConfigurationProperties(Properties configurationProperties) {
		this.configurationProperties = configurationProperties;
	}

	public void setMapperLocations(Resource[] mapperLocations) {
		this.mapperLocations = mapperLocations;
	}

	public void setDataSource(DataSource dataSource) {
		if (dataSource instanceof TransactionAwareDataSourceProxy) {
			this.dataSource = ((TransactionAwareDataSourceProxy) dataSource).getTargetDataSource();
		} else {
			this.dataSource = dataSource;
		}
	}
}