public IEnumerable <T> Find <T>(string tablename, string key) where T : new()
{
string tablefile = GetTableFile(tablename);
EntityTableMeta meta = GetMetaData(tablename);
Dictionary <long, EntityTableIndexItem> arr = null;
EntityTableIndexItem indexitem = null;
if (keyindexdic[tablename].TryGetValue(key, out arr))
{
//先找到offset
using (ObjTextReader otw = ObjTextReader.CreateReader(tablefile))
{
foreach (var o in arr)
{
indexitem = (EntityTableIndexItem)o.Value;
if (!indexitem.Del)
{
otw.SetPostion(indexitem.Offset);
var readobj = otw.ReadObject <EntityTableItem <T> >();
if (readobj == null)
{
yield return(default(T));
}
else
{
yield return(readobj.Data);
}
}
}
}
}
}
private bool Update2 <T>(string tablename, string key, T item, EntityTableMeta meta) where T : new()
{
string tablefile = GetTableFile(tablename);
Dictionary <long, EntityTableIndexItem> arr = null;
Tuple <long, long> offset = null;
int indexpos = 0;
var locker = GetKeyLocker(tablename, string.Empty);
lock (locker)
{
if (!keyindexdic[tablename].TryGetValue(key, out arr))
{
throw new Exception(string.Format("更新失败，key为{0}的记录数为0", key));
}
string keyindexfile = GetKeyFile(tablename);
EntityTableIndexItem indexitem = (EntityTableIndexItem)arr.Last().Value;
using (ObjTextWriter keywriter = ObjTextWriter.CreateWriter(keyindexfile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter keywriter = GetWriter(keyindexfile);
{
indexitem.Del = true;
keywriter.AppendObject(indexitem);
}
var keyvalue = item.Eval(meta.KeyProperty);
//var keyvalue=meta.KeyProperty.GetValueMethed(item);
if (keyvalue == null)
{
throw new Exception("key值不能为空");
}
var tableitem = new EntityTableItem <T>(item);
tableitem.Flag = (byte)EntityTableItemFlag.Ok;
using (ObjTextWriter otw = ObjTextWriter.CreateWriter(tablefile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter otw = GetWriter(tablefile);
{
offset = otw.PreAppendObject(tableitem, (s1, s2) =>
{
if (s1.Length <= indexitem.len)
{
Console.WriteLine("修改->覆盖");
return(otw.Override(indexitem.Offset, s1));
}
return(null);
});
}
Dictionary <long, EntityTableIndexItem> al = null;
var keyidc = keyindexdic[tablename];
if (!keyidc.TryGetValue(keyvalue.ToString(), out al))
{
lock (keyidc)
{
if (!keyidc.TryGetValue(keyvalue.ToString(), out al))
{
al = new Dictionary <long, EntityTableIndexItem>();
keyidc.TryAdd(keyvalue.ToString(), al);
}
}
}
EntityTableIndexItem newkey = new EntityTableIndexItem
{
Key = keyvalue.ToString(),
Offset = offset.Item1,
len = (int)(offset.Item2 - offset.Item1),
Del = false
};
if (newkey.Offset == indexitem.Offset)
{
newkey.len = indexitem.len;
}
arr[indexpos] = newkey;
using (ObjTextWriter keyidxwriter = ObjTextWriter.CreateWriter(keyindexfile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter keyidxwriter = GetWriter(keyindexfile);
//lock(keyidxwriter)
{
keyidxwriter.AppendObject(newkey);
}
foreach (var idx in meta.Indexs)
{
string indexfile = GetIndexFile(tablename, idx);
var indexvalue = item.Eval(meta.IndexProperties[idx]);
var newindex = new EntityTableIndexItem
{
Key = indexvalue == null ? string.Empty : indexvalue.ToString(),
Offset = offset.Item1,
len = (int)(offset.Item2 - offset.Item1),
Del = false
};
using (ObjTextWriter idxwriter = ObjTextWriter.CreateWriter(indexfile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter idxwriter = GetWriter(indexfile);
//lock(idxwriter)
{
idxwriter.AppendObject(newindex);
}
}
Console.WriteLine("写入成功:" + keyvalue + "->" + offset);
}
return(true);
}
private bool Insert2 <T>(string tablename, IEnumerable <T> items, EntityTableMeta meta) where T : new()
{
string tablefile = GetTableFile(tablename);
var locker = GetKeyLocker(tablename, string.Empty);
lock (locker)
{
ObjTextWriter otw = ObjTextWriter.CreateWriter(tablefile, ObjTextReaderWriterEncodeType.entitybuf);
string keyindexfile = GetKeyFile(tablename);
ObjTextWriter keywriter = ObjTextWriter.CreateWriter(keyindexfile, ObjTextReaderWriterEncodeType.entitybuf);
Dictionary <string, ObjTextWriter> idxwriterdic = new Dictionary <string, ObjTextWriter>();
try
{
foreach (var item in items)
{
var keyvalue = item.Eval(meta.KeyProperty);
//var keyvalue = meta.KeyProperty.GetValueMethed(item);
if (keyvalue == null)
{
throw new Exception("key值不能为空");
}
var keystr = keyvalue.ToString();
var keylocker = GetKeyLocker(tablename, keystr);
Dictionary <long, EntityTableIndexItem> arr = null;
lock (keylocker)
{
if (keyindexdic[tablename].TryGetValue(keystr, out arr))
{
throw new Exception(string.Format("key:{0}不可重复", keystr));
}
}
var tableitem = new EntityTableItem <T>(item);
tableitem.Flag = (byte)EntityTableItemFlag.Ok;
//using (ObjTextWriter otw = ObjTextWriter.CreateWriter(tablefile, ObjTextReaderWriterEncodeType.entitybuf))
//var otw = GetWriter(tablefile);
//lock(otw)
{
var offset = otw.AppendObject(tableitem);
Dictionary <long, EntityTableIndexItem> al = null;
var idc = keyindexdic[tablename];
if (!idc.TryGetValue(keystr, out al))
{
lock (idc)
{
if (!idc.TryGetValue(keystr, out al))
{
al = new Dictionary <long, EntityTableIndexItem>();
idc.TryAdd(keystr, al);
}
}
}
var newkey = new EntityTableIndexItem
{
Key = keystr,
Offset = offset.Item1,
len = (int)(offset.Item2 - offset.Item1)
};
lock (al)
{
al.Add(newkey.Offset, newkey);
}
//string keyindexfile = GetKeyFile(tablename);
//using (ObjTextWriter keywriter = ObjTextWriter.CreateWriter(keyindexfile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter keywriter = GetWriter(keyindexfile);
//lock(keywriter)
{
keywriter.AppendObject(newkey);
}
foreach (var idx in meta.Indexs)
{
string indexfile = GetIndexFile(tablename, idx);
var indexvalue = item.Eval(meta.IndexProperties[idx]);
var newindex = new EntityTableIndexItem
{
Key = indexvalue == null ? string.Empty : indexvalue.ToString(),
Offset = offset.Item1,
len = (int)(offset.Item2 - offset.Item1)
};
//using (ObjTextWriter idxwriter = ObjTextWriter.CreateWriter(indexfile, ObjTextReaderWriterEncodeType.entitybuf))
//ObjTextWriter idxwriter = GetWriter(indexfile);
//lock(idxwriter)
{
ObjTextWriter idxwriter = null;
if (!idxwriterdic.TryGetValue(indexfile, out idxwriter))
{
idxwriter = ObjTextWriter.CreateWriter(indexfile, ObjTextReaderWriterEncodeType.entitybuf);
idxwriterdic.Add(indexfile, idxwriter);
}
idxwriter.AppendObject(newindex);
}
}
}
}
}
finally
{
otw.Dispose();
keywriter.Dispose();
foreach (var kv in idxwriterdic)
{
kv.Value.Dispose();
}
}
}
return(true);
}