The table you're running the SELECT against doesn't have a primary key column. It cannot create any other UPDATE or DETELE statements because you have no way of uniquely identifying every single record in your table.
Then before executing update command of dataApdapter you have to set update command of dataAdapter with CommandBuilder object like this
public DataTable CreateCmdsAndUpdate(string connectionString,
string queryString)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.SelectCommand = new OleDbCommand(queryString, connection);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
connection.Open();
DataTable customers = new DataTable();
adapter.Fill(customers);
// code to modify data in DataTable here
adapter.Update(customers);
return customers;
}
}
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After some point of time I am changing/modifying the fields value through my front end screen. So my datatable value is below.
Table 2
CATEGORY
PNUMBER
CPOS
CLEN
AREA
CTYPE
FCODE
6
ITYPE
30
LSIZE
4
LSP
UNIT
50
AMS
In this case I don’t want to maintain the old data in my database. I want to store only the modified data.
For that purpose only, I am deleting the data and trying to insert the new data using datatable.
If I am using the below I am not able to maintain the modify datatable values in newdt.
Below is your code.
using (var adp1 = new OleDbAdapter("SELECT * FROM ..."))
{
adp1.Fill(newdt);
//Remove all the rows (delete from...)
//newdt.Rows.Clear();
//(Optional) Add some new rows
./**********************************************
I want to maintain the datatable values. I can’t add rows one by one. Because it is bunch of record which is available in datatable like newdt.
Error : Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
/************************************************
//Commit changes
adp1.Update(newdt);
};
Finally i modified the below changes. but, not working. (Overwriting the exisitng table values)
string connectionstring1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";"; OleDbConnection cn1 = new OleDbConnection(connectionstring1); OleDbDataAdapter adapter = new OleDbDataAdapter(); adapter.SelectCommand = new OleDbCommand("SELECT * FROM [" + tablename + "]", cn1); OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
DataTable DT1 = new DataTable(); DT1 = newdt.Copy();
newdt.Rows.Clear();
//adapter.Fill(newdt);
newdt.AcceptChanges();
//newdt.Rows.Clear();
newdt = DT1.Copy();
adapter.Update(newdt);
Error : The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine
the index to permit duplicate entries and try again.
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OleDbDataAdapter UPDATE ERROR
Aug 11, 2017 09:33 AM|gani7787|LINK
Hi,
I am trying to update table values using OLEDATA ADAPTER.
But, i am getting following Error
it will throw the error in adp1.Update(newdt)
Error : Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information.
My datatable structrue below :
Complete source code :
using (OleDbConnection cn = new OleDbConnection(connectionstring))
{
cn.Open();
DataTable Schema = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
for (int i = 0; i <= Schema.Rows.Count - 1; i++)
{
try
{
if ((Schema.Rows[i]["TABLE_NAME"]).ToString() == tableName)
{
using (OleDbDataAdapter adp1 = new OleDbDataAdapter("SELECT * FROM [" + (Schema.Rows[i]["TABLE_NAME"]).ToString() + "]", cn))
{
OleDbCommandBuilder commandBuilder = new OleDbCommandBuilder(adp1);
adp1.Update(newdt);
commandBuilder.QuotePrefix = "[";
commandBuilder.QuoteSuffix = "]";
dt = newdt;
return dt;
}
}
}
catch (Exception ex)
{
}
}
cn.Close();
}
}
return dt;
Can you tell us where is the problem.
I'm am new to update in Access through OLEDB Adapter for update.
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Re: OleDbDataAdapter UPDATE ERROR
Aug 11, 2017 07:17 PM|Mikesdotnetting|LINK
You shouldn't use DataSets for updating records in ASP.NET. You should SQL statements instead:
https://www.mikesdotnetting.com/article/26/parameter-queries-in-asp-net-with-ms-access
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Re: OleDbDataAdapter UPDATE ERROR
Aug 14, 2017 02:13 AM|Cathy Zou|LINK
Hi gani7787
The table you're running the SELECT against doesn't have a primary key column. It cannot create any other UPDATE or DETELE statements because you have no way of uniquely identifying every single record in your table.
You Have to Mention primary key in your Table.
https://social.msdn.microsoft.com/Forums/en-US/5dec5633-ac84-48d9-8fd6-5c7601be4ccd/exception-dynamic-sql-generation-for-the-updatecommand-is-not-supported-against-a-selectcommand?forum=Vsexpressvcs
https://www.codeproject.com/Questions/55136/SQL-problem-in-saving-SOLVED
Then before executing update command of dataApdapter you have to set update command of dataAdapter with CommandBuilder object like this
public DataTable CreateCmdsAndUpdate(string connectionString, string queryString) { using (OleDbConnection connection = new OleDbConnection(connectionString)) { OleDbDataAdapter adapter = new OleDbDataAdapter(); adapter.SelectCommand = new OleDbCommand(queryString, connection); OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter); connection.Open(); DataTable customers = new DataTable(); adapter.Fill(customers); // code to modify data in DataTable here adapter.Update(customers); return customers; } }Related links:
http://www.c-sharpcorner.com/uploadfile/mahesh/updating-the-database-using-the-update-method-in-ado-net/
https://msdn.microsoft.com/en-us/library/z1z2bkx2(v=vs.110).aspx
Best Regards
Cathy
Please remember to click "Mark as Answer" the responses that resolved your issue.
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Re: OleDbDataAdapter UPDATE ERROR
Aug 16, 2017 12:04 PM|gani7787|LINK
Thanks for your update.
my current database is MS-Access.
I used primary key in my table.
Also, First i am deleting record and then followed by inserting.
But, while inserting i am getting Error : Concurrency violation: the UpdateCommand affected 0 of the expected 1 records.
I am unable to find out the exact problem for this.
See my complete code.
string connectionstring1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";";
OleDbCommand command = new OleDbCommand();
OleDbTransaction transaction = null;
OleDbConnection cn1 = new OleDbConnection(connectionstring1);
cn1.Open();
// Start a local transaction
transaction = cn1.BeginTransaction();
// Assign transaction object for a pending local transaction.
command.Connection = cn1;
command.Transaction = transaction;
// Execute the commands.
string sqlTrunc = "DELETE FROM [" + tableName + "]";
OleDbCommand cmd = new OleDbCommand(sqlTrunc, cn);
cmd.ExecuteNonQuery();
transaction.Commit();
string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";";
//using (OleDbConnection cn = new OleDbConnection(connectionstring))
using (OleDbConnection connection = new OleDbConnection(ConStr))
{
connection.Open();
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.SelectCommand = new OleDbCommand("SELECT * FROM [" + TABLENAME + "]", connection);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
adapter.Fill(newdt);
adapter.Update(newdt);
}
What is the problem while inserting....?
Member
209 Points
700 Posts
Re: OleDbDataAdapter UPDATE ERROR
Aug 17, 2017 06:39 AM|gani7787|LINK
below is my requirement and queries.
Datatable newdt = new datatable();
Table 1
CATEGORY
PNUMBER
CPOS
CLEN
AREA
CTYPE
FCODE
6
ITYPE
3
LSIZE
4
LSP
UNIT
1
AMS
Table 2
CATEGORY
PNUMBER
CPOS
CLEN
AREA
CTYPE
FCODE
6
ITYPE
30
LSIZE
4
LSP
UNIT
50
AMS
If I am using the below I am not able to maintain the modify datatable values in newdt.
Below is your code.
using (var adp1 = new OleDbAdapter("SELECT * FROM ..."))
{
adp1.Fill(newdt);
//Remove all the rows (delete from...)
//newdt.Rows.Clear();
//(Optional) Add some new rows
./**********************************************
I want to maintain the datatable values. I can’t add rows one by one. Because it is bunch of record which is available in datatable like newdt.
Error : Update requires a valid UpdateCommand when passed DataRow collection with modified rows.
/************************************************
//Commit changes
adp1.Update(newdt);
};
Finally i modified the below changes. but, not working. (Overwriting the exisitng table values)
string connectionstring1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";";
OleDbConnection cn1 = new OleDbConnection(connectionstring1);
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.SelectCommand = new OleDbCommand("SELECT * FROM [" + tablename + "]", cn1);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
DataTable DT1 = new DataTable();
DT1 = newdt.Copy();
newdt.Rows.Clear();
//adapter.Fill(newdt);
newdt.AcceptChanges();
//newdt.Rows.Clear();
newdt = DT1.Copy();
adapter.Update(newdt);
Error : The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.
Member
209 Points
700 Posts
Re: OleDbDataAdapter UPDATE ERROR
Aug 17, 2017 11:53 AM|gani7787|LINK
Are you catching my points...? if not pls. let me know..
Member
209 Points
700 Posts
Re: OleDbDataAdapter UPDATE ERROR
Aug 17, 2017 01:01 PM|gani7787|LINK
The below code is partially working. But, i don't want to add/hardcode values in to datatable.
updating datatable values already formed and stored into newdt.
My final partial working code :
string connectionstring1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";";
OleDbConnection cn1 = new OleDbConnection(connectionstring1);
OleDbCommand command = new OleDbCommand();
command.Connection = cn1;
string sqlTrunc = "DELETE FROM [" + tableName + "]";
OleDbCommand cmd = new OleDbCommand(sqlTrunc, cn);
cmd.ExecuteNonQuery();
OleDbDataAdapter adapter = new OleDbDataAdapter();
adapter.SelectCommand = new OleDbCommand("SELECT * FROM [" + (Schema.Rows[i]["TABLE_NAME"]).ToString() + "]", cn1);
OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter);
adapter.Fill(newdt);
////Remove all the rows (delete from...)
newdt.Rows.Clear();
/*************START : HIGHLIGHT ******************************
newdt.Rows.Add("AREA", null, null, null);
newdt.Rows.Add("CTYPE", null, null, null);
newdt.Rows.Add("FCODE", "3", null, null);
newdt.Rows.Add("ITYPE", "6", null, null);
newdt.Rows.Add("LSIZE", "2", null, null);
newdt.Rows.Add("LSP", "5", null, null);
newdt.Rows.Add("UNIT", "5", null, null);
newdt.Rows.Add("AMS", null, null, null);
/************* END : HIGHLIGHT *******************************
//Commit changes
adapter.Update(newdt);
The Highlighted portion is manually added new rows and hardcoded.
But,i already formed and stored new values in newdt table. So, i just want to call the portion only.
Also, First i am deleting the existing record. It means, the same kind of record i want to insert which is some fields modifications.
The above code is working. But, instead of adding the hardcode values, i just want to call the stored datatable values in newdt.
How to do that..?
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Re: OleDbDataAdapter UPDATE ERROR
Aug 21, 2017 07:37 PM|Mikesdotnetting|LINK
Please stop trying to use a DataSet for this operation. I am happy to help you if you want to try my suggestion.
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700 Posts
Re: OleDbDataAdapter UPDATE ERROR
Aug 22, 2017 09:02 AM|gani7787|LINK
Yes. i need your help...
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Re: OleDbDataAdapter UPDATE ERROR
Aug 22, 2017 12:38 PM|Mikesdotnetting|LINK
Where are the updated values coming from? A Form? Can you show some code?
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Re: OleDbDataAdapter UPDATE ERROR
Sep 19, 2017 11:13 AM|gani7787|LINK
sorry for the late reply.
see my complete code.
private void btnupdate_Click(object sender, EventArgs e) { DataTable Dt1 = new DataTable(); dbData.INSERTUPDATEdb("Employee", ref Dt1, true); // This is for to fetch data to display in dropdown Dt1.Rows[0][0] = "1001"; Dt1.Rows[1][0] = "1002"; Dt1.Rows[2][0] = "1003"; Dt1.Rows[3][0] = "1004"; Dt1.Rows[0][1] = CboBox1.Text; //A1 Dt1.Rows[1][1] = CboBox2.Text; //A2 Dt1.Rows[2][1] = CboBox3.Text; Dt1.Rows[3][1] = CboBox4.Text; //A4 Dt1.Rows[0][2] = CboBox5.Text; //100 Dt1.Rows[1][2] = CboBox6.Text; //200 Dt1.Rows[2][2] = CboBox7.Text; Dt1.Rows[3][2] = CboBox8.Text; //500 Dt1.Rows[0][3] = CboBox8.Text; //A Dt1.Rows[1][3] = CboBox9.Text; //B Dt1.Rows[2][3] = CboBox10.Text; Dt1.Rows[3][3] = CboBox11.Text; //D dbData.INSERTUPDATEdb("Employee", ref Dt1, false); } public static DataTable INSERTUPDATEdb(string tableName, ref DataTable NDT, bool flag) { DataTable retVal = new DataTable(); DataTable dt = new DataTable(); string mdbname = "MVM/Local/Project1"; string connectionstring = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";"; if (flag == true) { using (OleDbConnection cn = new OleDbConnection(connectionstring)) { cn.Open(); DataTable Schema = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); for (int i = 0; i <= Schema.Rows.Count - 1; i++) { try { NDT.TableName = (Schema.Rows[i]["TABLE_NAME"]).ToString(); if ((Schema.Rows[i]["TABLE_NAME"]).ToString() == tableName) { using (OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [" + (Schema.Rows[i]["TABLE_NAME"]).ToString() + "]", cn)) { adapter.Fill(NDT); } return NDT; } } catch (Exception ex) { } } cn.Close(); } } else { using (OleDbConnection cn = new OleDbConnection(connectionstring)) { cn.Open(); DataTable Schema = cn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); for (int i = 0; i <= Schema.Rows.Count - 1; i++) { try { if ((Schema.Rows[i]["TABLE_NAME"]).ToString() == tableName) { string connectionstring1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + mdbname + ";"; OleDbConnection cn1 = new OleDbConnection(connectionstring1); OleDbCommand command = new OleDbCommand(); OleDbDataAdapter adapter = new OleDbDataAdapter(); adapter.SelectCommand = new OleDbCommand("SELECT Empnumber,Name,Marks,Grade FROM [" + (Schema.Rows[i]["TABLE_NAME"]).ToString() + "]", cn1); OleDbCommandBuilder builder = new OleDbCommandBuilder(adapter); adapter.Fill(NDT); adapter.Update(NDT); return dt; } } catch (Exception ex) { } } cn.Close(); } } return dt; }i want to insert a record in the below place..??
How to insert instead of adapter.fill and update...?
If i use the above code it says either error or i am unable to do (insert) anything...?
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Re: OleDbDataAdapter UPDATE ERROR
Sep 20, 2017 02:04 AM|Cathy Zou|LINK
Hi kalyanns,
From your description, you want to insert data to database.
If that the case, you could use the following code:
using(OleDbConnection myCon = new OleDbConnection(ConfigurationManager.ConnectionStrings["DbConn"].ToString())) { OleDbCommand cmd = new OleDbCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = "insert into Items ([Item_Name],[Item_Price]) values (?,?); cmd.Parameters.AddWithValue("@item", itemNameTBox.Text); cmd.Parameters.AddWithValue("@price", Convert.ToDouble(itemPriceTBox.Text)); cmd.Connection = myCon; myCon.Open(); cmd.ExecuteNonQuery(); System.Windows.Forms.MessageBox.Show("An Item has been successfully added", "Caption", MessageBoxButtons.OKCancel, MessageBoxIcon.Information); }Related links:
https://stackoverflow.com/questions/10941284/how-to-insert-a-record-into-a-access-table-using-oledb
http://csharp.net-informations.com/dataadapter/insertcommand-oledb.htm
Best regards
Cathy
Please remember to click "Mark as Answer" the responses that resolved your issue.
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Re: OleDbDataAdapter UPDATE ERROR
Sep 20, 2017 09:21 AM|gani7787|LINK
I will try your code for insertion.
what is values (?,?)
is it values (@item,@price)..? Am i right..?
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Re: OleDbDataAdapter UPDATE ERROR
Sep 20, 2017 03:39 PM|Mikesdotnetting|LINK
You didn't bother to look at the article I linked to? And is this actually a web application?