?
Solved

Mandatory to call GetUpdateCommand of SqlCommandBuilder ?

Posted on 2009-07-13
4
Medium Priority
?
1,007 Views
Last Modified: 2012-05-07
I am updating/inserting database via dataset.
According to the sample code from Microsoft documentation, it is required to call GetUpdateCommand() and GetInsertCommand() of the command builder before doing
adapter.Update(ds, dataTableName).

But my program works fine even without calling these.
Could somebody tell if I really need to call these methods ?
Without that, what kind of problem could happen?
SqlConnection conn = new SqlConnection(CONNECTION_STRING);
 
            string dataTableName = "PRICE_DATA";
 
            DataSet ds = new DataSet(dataTableName);
 
            string sql = "SELECT Ticker, As_of, Updt_dt, eqy_weighted_avg_px, px_open, px_volume, asset_id, modifiedtimestamp FROM Price WHERE Updt_dt = '" + update_Date + "'";
 
            SqlCommand selectCMD = new SqlCommand(sql, conn);
            SqlDataAdapter da = new SqlDataAdapter(selectCMD);
            SqlCommandBuilder builder = new SqlCommandBuilder(da);
 
            conn.Open();
 
            try
            {
 
                da.Fill(ds, dataTableName);
 
            }
            catch (SqlException ex)
            {
 
                throw ex;
            }
 
 
            //Setting composite PK
            DataColumn[] keys = new DataColumn[2];
            DataColumn column1 = ds.Tables[0].Columns["TICKER"];
            DataColumn column2 = ds.Tables[0].Columns["UPDT_DT"];
 
            keys[0] = column1;
            keys[1] = column2;
 
            ds.Tables[0].PrimaryKey = keys;
 
 
            
            foreach (Security sec in securities)
            {
 
                if (sec.OpenPrice != 0 && sec.Volume != 0  && sec.WeightedAverage != 0) //if value is not available, do not insert
                {
                    //Key Values
                    object[] myKeyValues = { sec.Ticker, sec.UpdateDate.ToString("yyyyMMdd") };
 
                    if (ds.Tables[dataTableName].Rows.Contains(myKeyValues))
                    {
                        //UPDATE
 
                        DataRow existingRow = ds.Tables[dataTableName].Rows.Find(myKeyValues);
 
                        existingRow["AS_OF"] = sec.AsOfDate.ToString("yyyyMMdd");
                        existingRow["PX_OPEN"] = sec.OpenPrice;
                        existingRow["PX_VOLUME"] = sec.Volume;
                        existingRow["EQY_WEIGHTED_AVG_PX"] = sec.WeightedAverage;
                        existingRow["MODIFIEDTIMESTAMP"] = DateTime.Now;
 
                    }
                    else
                    {
                        //INSERT
 
                        DataRow newRow = ds.Tables[dataTableName].NewRow();
 
                        newRow["TICKER"] = sec.Ticker;
                        newRow["AS_OF"] = sec.AsOfDate.ToString("yyyyMMdd");
                        newRow["UPDT_DT"] = DateTime.Now.Date.ToString("yyyyMMdd");
                        newRow["EQY_WEIGHTED_AVG_PX"] = sec.WeightedAverage;
                        newRow["PX_OPEN"] = sec.OpenPrice;
                        newRow["PX_VOLUME"] = sec.Volume;
                        newRow["ASSET_ID"] = sec.AssetId;
                        newRow["MODIFIEDTIMESTAMP"] = DateTime.Now;
 
                        ds.Tables[0].Rows.Add(newRow);
 
 
                    }
 
                }
 
 
            }
 
 
            builder.GetUpdateCommand(); //not necessary ?
            builder.GetInsertCommand();//not necessary ?
 
                
	    da.Update(ds, dataTableName);

Open in new window

0
Comment
Question by:Takamasa
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 24850354
If you reach da.Update(ds, dataTableName) without calling GetUpdateCommand and GetInsertCommand, does the SqlDataAdapter have an instance of an UpdateCommand and InsertCommand?  I don't see anything in the SqlCommandBuilder or DbCommandBuilder (base class), that would construct the commands otherwise.
0
 

Author Comment

by:Takamasa
ID: 24856811
Hi. Thank you for the response.
No, both UpdateCommand and InsertCommand are null...
0
 
LVL 96

Accepted Solution

by:
Bob Learned earned 1500 total points
ID: 24858439
Then, I would suggest that there isn't any updates or inserts, or there should have been an exception.  I always use the GetUpdateCommand, GetInsertCommand, and GetDeleteCommand with command builders.
0
 

Author Comment

by:Takamasa
ID: 24865560
Hello TheLearnedOne,
Thank you for your comment again.
Strangely the data do get inserted in my database, which made me wonder what is the use of GetInsertCommand. Anyways, I will use the GetUpdateCommand and GetInsertCommand like you suggested.
Thank you!
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article series is supposed to shed some light on the use of IDisposable and objects that inherit from it. In essence, a more apt title for this article would be: using (IDisposable) {}. I’m just not sure how many people would ge…
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question