parameterMap 已经废弃不再解释
直接看resultMap的解析入口
XMLMapperBuilder resultMapElements(context.evalNodes("/mapper/resultMap"));
String id = resultMapNode.getStringAttribute("id",
resultMapNode.getValueBasedIdentifier());
String type = resultMapNode.getStringAttribute("type",
resultMapNode.getStringAttribute("ofType",
resultMapNode.getStringAttribute("resultType",
resultMapNode.getStringAttribute("javaType"))));
String extend = resultMapNode.getStringAttribute("extends");
Boolean autoMapping = resultMapNode.getBooleanAttribute("autoMapping");
Class<?> typeClass = resolveClass(type);
Discriminator discriminator = null;
List<ResultMapping> resultMappings = new ArrayList<ResultMapping>();
resultMappings.addAll(additionalResultMappings);
List<XNode> resultChildren = resultMapNode.getChildren();
for (XNode resultChild : resultChildren) {
if ("constructor".equals(resultChild.getName())) {
processConstructorElement(resultChild, typeClass, resultMappings);
} else if ("discriminator".equals(resultChild.getName())) {
discriminator = processDiscriminatorElement(resultChild, typeClass, resultMappings);
} else {
List<ResultFlag> flags = new ArrayList<ResultFlag>();
if ("id".equals(resultChild.getName())) {
flags.add(ResultFlag.ID);
}
resultMappings.add(buildResultMappingFromContext(resultChild, typeClass, flags));
}
}
ResultMapResolver resultMapResolver = new ResultMapResolver(builderAssistant, id, typeClass, extend, discriminator, resultMappings, autoMapping);
try {
return resultMapResolver.resolve();
} catch (IncompleteElementException e) {
configuration.addIncompleteResultMap(resultMapResolver);
throw e;
}
可以看出上面主要是获取id和type,extend,autoMapping,其中type有可能是type ofType resultType,javaType。
接着获取type对应的class
最终都会调用buildResultMappingFromContext 这个方法
通过这个方法生成一个resultMap对象