複数の PC で共有されるデータベースを使用するソフトウェアに取り組んでいます。プロジェクトは、行方不明の手荷物情報を保存しようとしています。新しく挿入されたレコードをマスター DB にコピーする機能を提供しました。ここで何が起こるかというと、複数のユーザーが同時にデータベースを更新しようとすると、単一のアイテムがグローバル DB に複数回格納されます。
だから私はシリアル化可能なを使用して TableLock を使用しようとしましたが、ここでは何も得られませんでした。
編集
query = "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;BEGIN TRANSACTION;";
insertdata(query); //using cmd.ExecuteNonQuery();
query = "select * from Goods WITH (TABLOCKX)" ;
DataSet dsGoods = getdata(query, "config");//Function to get the data
updateitem();
query = "COMMIT TRANSACTION";
insertdata(query);//using cmd.ExecuteNonQuery();
そして updateitem() は次のとおりです
public static void updateitem()
{
string query = "select * from config where param='lastsync'";
DataSet ds = dataaccess.getdata(query, "config");
query = "select isonlive,associateid,itemid,founddate,regdate,status,foundbyname,categoryid,subcatid,item,model,color,foundwhere,returnedtoname,showonline,officeid,isdeleted,(select username from [user] where userid=registeredby) as reguser,(select username from [user] where userid=returnby) as returnedby,notes,returneddate from item ";
String updatedDate =ds.Tables[0].Rows[0]["value"].ToString();
if (updatedDate != "")
{
query = "select isonlive,associateid,itemid,founddate,regdate,foundbyname,status,categoryid,subcatid,item,model,color,foundwhere,returnedtoname,officeid,showonline,isdeleted,(select username from [user] where userid=registeredby) as reguser,(select username from [user] where userid=returnby) as returnedby,notes,returneddate from item where updateat >= @updateat";
}
System.Data.SqlClient.SqlCommand cmd = new SqlCommand(query);
if (updatedDate != "")
{
cmd.Parameters.AddWithValue("@updateat",DateTime.ParseExact(updatedDate,"dd-MM-yyyy HH:mm:ss",null,System.Globalization.DateTimeStyles.None));
}
DataRow dr;
ds = dataaccess.getdata(cmd, "item");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
try
{
int status = 0;
dr = ds.Tables[0].Rows[i];
if (dr["status"].ToString() == "Transferred")
{
status = 2;
}
else if (dr["status"].ToString() != "Received")
{
status = 1;
}
DateTime regdate = Convert.ToDateTime(dr["regdate"]);
DateTime founddate = Convert.ToDateTime(dr["founddate"]);
//returndatetime = String.Format("MMM dd yyyy H:mm:ss", returndate);
if (dr["showonline"].ToString() == "False")
{
status = 1;
}
if (dr["isdeleted"].ToString() == "true")
{
insertdata("delete from goods where AssociateID='" + dr["associateid"] + "' and ID='" + dr["itemid"] + "'");
continue;
}
if (dr["isonlive"].ToString() == "true")
{
query = "update goods set Status='" + status + "',officeid='" + dr["officeID"] + "', notes='" + dr["notes"].ToString().Replace("'", "''") + "',ReturnedTo='" + dr["returnedtoname"].ToString().Replace("'", "''") + "',founddate=@founddate,ReturnedDate=@returndate,ReturnedBy='" + dr["returnedby"].ToString().Replace("'", "''") +
"',Model='" + dr["model"].ToString().Replace("'", "''") + "',ColorID='" + dr["color"].ToString().Replace("'", "''") + "',FoundWhere='" + dr["foundwhere"].ToString().Replace("'", "''") + "',MainCat='" + dr["categoryid"] + "',SubCat='" + dr["subcatid"] + "',ItemID='" + dr["item"] + "' where AssociateID='" + dr["associateid"] + "' and ID='" + dr["itemid"] + "'";
}
else
{
query = "select * from goods where AssociateID='" + dr["associateid"] + "' and ID='" + dr["itemid"] + "' and MainCat='" + dr["categoryid"] + "' and SubCat='" + dr["subcatid"] + "' and ItemID='" + dr["item"] + "'";
DataSet dsItems = getdata(query, "config");
if(dsItems.Tables[0].Rows.Count==0)
{
query = "insert into goods (AssociateID,ID,DateReg,Status,MainCat,SubCat,ItemID,Model,ColorID,FoundWhere,RegBy,FoundBy,ReturnedTo,ReturnedDate,ReturnedBy,Notes,IP,founddate,officeid) values('" + dr["associateid"] + "','" + dr["itemid"] + "',@regdate,'" + status + "'," +
"'" + dr["categoryid"] + "','" + dr["subcatid"] + "','" + dr["item"] + "','" + dr["model"].ToString().Replace("'", "''") + "','" + dr["color"].ToString().Replace("'", "''") + "'," +
"'" + dr["foundwhere"].ToString().Replace("'", "''") + "','" + dr["reguser"].ToString().Replace("'", "''") + "','" + dr["reguser"].ToString().Replace("'", "''") + "','" + dr["returnedtoname"].ToString().Replace("'", "''") + "',@returndate," +
"'" + dr["returnedby"].ToString().Replace("'", "''") + "','" + dr["notes"].ToString().Replace("'", "''") + "','',@founddate,'" + dr["officeID"].ToString() + "')";
}
}
SqlCommand sce = new SqlCommand(query);
if (dr["returneddate"].ToString() != "")
{
sce.Parameters.AddWithValue("@returndate", Convert.ToDateTime(dr["returneddate"]));
}
else
{
sce.Parameters.Add("@returndate", SqlDbType.DateTime).Value = DBNull.Value;
}
sce.Parameters.AddWithValue("@regdate", regdate);
sce.Parameters.AddWithValue("@founddate", founddate);
insertdata(sce);
query = "update item set isonlive = 'true',updateat=@updateDate where itemid = '" + dr["itemid"] + "'";
sce = new SqlCommand(query);
sce.Parameters.AddWithValue("@updateDate", DateTime.Now);
dataaccess.insertdata(sce);
}
catch (Exception ex)
{
App.writelog(ex.Message + "\n" + ex.StackTrace);
}
}
}
PS: ASP.Net で実行したいです。