MyBatis之初始化

mybatis初始化的主要工作是載入並解析mybatis-config.xml配置檔案、對映配置檔案以及相關的註解資訊。

mybatis初始化的入口是 sqlsessionfactorybuilder#build(reader reader, string environment, properties properties)

public sqlsessionfactory build(reader reader, string environment, properties properties)  catch (exception e)  finally  catch (ioexception e) 

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2.xmlconfigbuilder 的主要職責是負責解析 mybatis-config.xml 配置檔案

public class xmlconfigbuilder extends basebuilder

private void parseconfiguration(xnode root)  catch (exception e) 

}

public void parse() 

parsependingresultmaps();
parsependingchacherefs();
parsependingstatements();
}

private void configurationelement(xnode context) 

builderassistant.setcurrentnamespace(namespace);
cacherefelement(context.evalnode("cache-ref"));
cacheelement(context.evalnode("cache"));
buildstatementfromcontext(context.evalnodes("select|insert|update|delete"));
} catch (exception e) 
}

parsestatementnode是解析sql節點的入口：

public void parsestatementnode() 

integer fetchsize = context.getintattribute("fetchsize");
integer timeout = context.getintattribute("timeout");
string parametermap = context.getstringattribute("parametermap");
string parametertype = context.getstringattribute("parametertype");
class<?> parametertypeclass = resolveclass(parametertype);
string resultmap = context.getstringattribute("resultmap");
string resulttype = context.getstringattribute("resulttype");
string lang = context.getstringattribute("lang");
languagedriver langdriver = getlanguagedriver(lang);
class<?> resulttypeclass = resolveclass(resulttype);
string resultsettype = context.getstringattribute("resultsettype");
statementtype statementtype = statementtype.valueof(context.getstringattribute("statementtype", statementtype.prepared.tostring()));
resultsettype resultsettypeenum = resolveresultsettype(resultsettype);
string nodename = context.getnode().getnodename();
sqlcommandtype sqlcommandtype = sqlcommandtype.valueof(nodename.touppercase(locale.english));
boolean isselect = sqlcommandtype == sqlcommandtype.select;
boolean flushcache = context.getbooleanattribute("flushcache", !isselect);
boolean usecache = context.getbooleanattribute("usecache", isselect);
boolean resultordered = context.getbooleanattribute("resultordered", false);
// include fragments before parsing
xmlincludetransformer includeparser = new xmlincludetransformer(configuration, builderassistant);
// parse selectkey after includes and remove them.
processselectkeynodes(id, parametertypeclass, langdriver);
// parse the sql (pre: and were parsed and removed)
sqlsource sqlsource = langdriver.createsqlsource(configuration, context, parametertypeclass);
string resultsets = context.getstringattribute("resultsets");
string keyproperty = context.getstringattribute("keyproperty");
string keycolumn = context.getstringattribute("keycolumn");
keygenerator keygenerator;
string keystatementid = id + selectkeygenerator.select_key_suffix;
if (configuration.haskeygenerator(keystatementid)) else 
fetchsize, timeout, parametermap, parametertypeclass, resultmap, resulttypeclass,
resultsettypeenum, flushcache, usecache, resultordered, 
keygenerator, keyproperty, keycolumn, databaseid, langdriver, resultsets);
}

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