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本文主要分析SqlSessionFactory的构建过程
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SqlSessionFactoryBuilder从XML中构建SqlSessionFactory
String resource = "org/mybatis/example/mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
SqlSessionFactoryBuilder用来创建SqlSessionFactory实例,一旦创建了SqlSessionFactory,就不再需要它了
public SqlSessionFactory build(InputStream inputStream) {
return build(inputStream, null, null);
}
调用
public SqlSessionFactory build(InputStream inputStream, String environment, Properties properties)
源码如下:
/**
* 根据配置创建SqlSessionFactory
*
* @param inputStream 配置文件输入流
* @param environment 环境名称
* @param properties 外部配置
* @return
*/
public SqlSessionFactory build(InputStream inputStream, String environment, Properties properties) {
try {
XMLConfigBuilder parser = new XMLConfigBuilder(inputStream, environment, properties);
//parser.parse()读取配置文件返回configuration
//build()根据返回的configuration创建SqlSessionFactory
return build(parser.parse());
} catch (Exception e) {
throw ExceptionFactory.wrapException("Error building SqlSession.", e);
} finally {
ErrorContext.instance().reset();
try {
inputStream.close();
} catch (IOException e) {
// Intentionally ignore. Prefer previous error.
}
}
}
最终创建DefaultSqlSessionFactory实例
public SqlSessionFactory build(Configuration config) {
return new DefaultSqlSessionFactory(config);
}
其中
XMLConfigBuilder与Configuration
XMLConfigBuilder的方法parse()
public Configuration parse() {
if (parsed) {
throw new BuilderException("Each XMLConfigBuilder can only be used once.");
}
parsed = true;
//读取mybatis-config.xml配置信息,"configuration"是根结点
parseConfiguration(parser.evalNode("/configuration"));
return configuration;
}
XMLConfigBuilder的方法parseConfiguration(XNode root)
/**
* 读取配置文件组装configuration
* @param root 配置文件的configuration节点
*/
private void parseConfiguration(XNode root) {
try {
//issue #117 read properties first
propertiesElement(root.evalNode("properties"));
typeAliasesElement(root.evalNode("typeAliases"));
pluginElement(root.evalNode("plugins"));
objectFactoryElement(root.evalNode("objectFactory"));
objectWrapperFactoryElement(root.evalNode("objectWrapperFactory"));
reflectionFactoryElement(root.evalNode("reflectionFactory"));
settingsElement(root.evalNode("settings"));
// read it after objectFactory and objectWrapperFactory issue #631
environmentsElement(root.evalNode("environments"));
databaseIdProviderElement(root.evalNode("databaseIdProvider"));
typeHandlerElement(root.evalNode("typeHandlers"));
mapperElement(root.evalNode("mappers"));
} catch (Exception e) {
throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);
}
}
关于配置文件相关的源码分析参看:
http://www.iocoder.cn/MyBatis/udbwcso/Configuration
从SqlSessionFactory和Configuration的创建过程中可以看出它们都使用了建造者模式.