Mongodb源码分析--插入记录及索引B树构建
在之前的一篇文章中，介绍了assembleResponse函数(位于instance.cpp第224行)，它会根据op操作枚举类型来调用相应的crud操作，枚举类型定义如下：enum Operations {
opReply = 1, /* reply. responseTo is set. */
dbMsg = 1000, /* generic msg command followed by a string */
dbUpdate = 2001, /* update object */
dbInsert = 2002,
//dbGetByOID = 2003,
dbQuery = 2004,
dbGetMore = 2005,
dbDelete = 2006,
dbKillCursors = 2007
};
可以看到dbInsert = 2002 为插入操作枚举值，下面我们看一下assembleResponse在确定是插入操作时调用的方法，如下：
assembleResponse( Message &m, DbResponse &dbresponse, const SockAddr &client ) {
.....
try {
if ( op == dbInsert ) {//添加记录操作
receivedInsert(m, currentOp);
}
else if ( op == dbUpdate ) { //更新记录
receivedUpdate(m, currentOp);
}
else if ( op == dbDelete ) { //删除记录
receivedDelete(m, currentOp);
}
else if ( op == dbKillCursors ) { //删除Cursors（游标）对象
currentOp.ensureStarted();
logThreshold = 10;
ss code;
saveerrmsg = le->msg;
}
else {
savecode = e.getCode();
saveerrmsg = e.what();
}
//回滚索引操作(drop索引)
string name = idx.indexName();
BSONObjBuilder b;
string errmsg;
bool ok = dropIndexes(tableToIndex, tabletoidxns.c_str(), name.c_str(), errmsg, b, true);
if( !ok ) {
log()
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