//---------------------------------------------------------------------------------------
public IndexInfo(string idxname, string tblname, string fldname, Transaction tx)
{
this.idxname = idxname;
this.fldname = fldname;
this.tx = tx;
ti = SimpleDB.mdMgr().getTableInfo(tblname, tx);
si = SimpleDB.mdMgr().getStatInfo(tblname, ti, tx);
}
private void refreshStatistics(Transaction tx)
{
lock (threadLock)
{
tablestats = new Dictionary <string, StatInfo>();
numcalls = 0;
TableInfo tcatmd = tblMgr.getTableInfo("tblcat", tx); //获取tblcat表中的信息
RecordFile tcatfile = new RecordFile(tcatmd, tx); //利用这些信息新建一个RecordFile读取类
while (tcatfile.next())
{ //获取每一张表的字段信息，计算出块数和记录数，添加到统计信息管理器中去
string tblname = tcatfile.getString("tblname");
TableInfo md = tblMgr.getTableInfo(tblname, tx);
StatInfo si = calcTableStats(md, tx);
tablestats.Add(tblname, si);
}
tcatfile.close();
}
}