I have a table in MS Access where few columns are memo datatype.Using c# code, I am reading data from that table and creating a list.That list i am binding with a datagridview.I am able to read the data from each row of the ms access table rows but whereever large data is available it it unable to read the complete data. Any suggestion please?
Here is the code what i am trying. It's getting the data, but for each cell few data only reading, not all:
List<RavasCustomOptional> lstAllAccessories = new List<RavasCustomOptional>();
using (OleDbConnection cn = new OleDbConnection(connectionstring))
{
OleDbCommand cmd = new OleDbCommand(query, cn);
cn.Open();
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables.Count > 0)
{
foreach (DataRow dr in ds.Tables[0].Rows)
{
RavasCustomOptional aRavasOptional = new RavasCustomOptional();
aRavasOptional.OptionalId = Convert.ToInt32(dr["pk_aid"].ToString().Substring(1));
aRavasOptional.OptionalCustomId = dr["pk_aid"].ToString();
aRavasOptional.OptionalMake = dr["c_make"].ToString();
aRavasOptional.OptionalName = dr["c_nam"].ToString();
aRavasOptional.OptionalDescription = dr["c_des"].ToString();
aRavasOptional.OptionalPrice = dr["c_pri"].ToString();
string optionalOtherDescription = dr["OtherDesc"].ToString();
aRavasOptional.OptionalOtherDescription = optionalOtherDescription.Replace("•", Environment.NewLine + "• ");
aRavasOptional.OptionalRemark = dr["c_remark"].ToString();
aRavasOptional.OptionalForProductId = dr["c_pid"].ToString();
aRavasOptional.OptionalForProductModel = dr["c_mod"].ToString();
lstAllAccessories.Add(aRavasOptional);
}
}
}
Related
As title says I've used odbcconnection to sqlconnection and for the life of me cant get it to work.. Copied a bunch of code from this site but cant get them both to work.
The program just hangs so maybe I am doing something wrong, but would appreciate maybe a bare bones template that i could just fill in the connection details and bulk copy the table to table..
using (OdbcConnection myConnection = new OdbcConnection())
{
string myConnectionString = #"Driver={Microsoft Access Driver (*.mdb)};" +
"Dbq=//####/data/Toronto/wrkgrp/wrkgrp30/Business Risk Oversight and Control/DATA INTEGRITY/CDE/CDE Testing Portal Requirements/Migration Requirements/RCM/Mutual Funds/Mutual Funds.mdb;";
myConnection.ConnectionString = myConnectionString;
myConnection.Open();
//execute queries, etc
OdbcCommand cmd = myConnection.CreateCommand();
cmd.CommandText = "SELECT * FROM RCM_MF_New_Accounts_Samples";
OdbcDataReader reader = cmd.ExecuteReader(); // close conn after complete
DataTable myDataTable = new DataTable();
myDataTable.Load(reader);
//myConnection.Close();
string destinationConnectionString = "Data Source=####;Initial Catalog=DYOF_STAGING_BROC;User ID=;Password=;Connection Timeout=999";
SqlConnection destination = new SqlConnection(destinationConnectionString);
SqlBulkCopy bulkData;
//destination.Open();
Exception ex = null;
try
{
Console.WriteLine("step1");
bulkData = new SqlBulkCopy(destinationConnectionString, SqlBulkCopyOptions.FireTriggers);
bulkData.BulkCopyTimeout = 1;
bulkData.DestinationTableName = "Load_CTR_Sample_Account_Opening2";
bulkData.WriteToServer(myDataTable);
bulkData.Close();
Console.WriteLine("moved from here to there");
reader.Close();
//destination.Close();
}
catch (Exception e)
{
ex = e;
}
I actually wrote an ORM to make this kind of task easier.
var accessDS = new AccessDataSource(connectionString1);
var dt = accessDS.From("RCM_MF_New_Accounts_Samples").ToDataTable().Execute();
var sqlDS = new SqlServerDataSource(connectionString2);
sqlDS.InsertBulk("Load_CTR_Sample_Account_Opening2", dt).Execute();
This does not work for .NET Core.
Packages:
https://www.nuget.org/packages/Tortuga.Chain.Access/
https://www.nuget.org/packages/Tortuga.Chain.SqlServer
Read the data from Access into a DataTable:
string strConnect = #"Provider=Microsoft.ACE.OLEDB.12.0;data source=D:\Temp\MyDB.accdb";
DataTable dt = new DataTable();
using (OleDbConnection con = new OleDbConnection(strConnect))
{
OleDbCommand cmd = new OleDbCommand("SELECT * FROM MyTable", con);
con.Open();
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
da.Fill(dt);
}
Then use SqlBulkCopy to update SQL:
string strConnect = #"Data Source=GRIFFPC\SQLEXPRESS;Initial Catalog=Testing;Integrated Security=True";
using (SqlConnection con = new SqlConnection(strConnect))
{
con.Open();
using (SqlBulkCopy bulk = new SqlBulkCopy(con))
{
bulk.DestinationTableName = "Test";
bulk.WriteToServer(dt);
}
}
Of course, there is a much easier way to go straight from Access to SQL Server, using VBA, SQL , or other methods.
https://support.office.com/en-us/article/import-or-link-to-data-in-an-sql-server-database-a5a3b4eb-57b9-45a0-b732-77bc6089b84e
https://www.sqlshack.com/six-different-methods-to-copy-tables-between-databases-in-sql-server/
Here's a basic example of bulk insert.
public void BulkInsert(DataTable employees)
{
if (employees == null)
throw new ArgumentNullException(nameof(employees), $"{nameof(employees)} is null.");
using (var con = OpenConnection())
using (var sbc = new SqlBulkCopy(con))
{
sbc.DestinationTableName = "HR.Employee";
foreach (DataColumn column in employees.Columns)
sbc.ColumnMappings.Add(column!.ColumnName, column.ColumnName);
sbc.WriteToServer(employees);
}
}
Note the foreach (DataColumn column in employees.Columns) loop. This is required so that it knows the column names are the same in the source and the target table. (If they're not the same, manually map them in the same fashion.)
Source: https://grauenwolf.github.io/DotNet-ORM-Cookbook/BulkInsert.htm#ado.net
Following option need to verify
1) Column Name should be the same.
2) verify the column length.
3) verify the data type.
I would really appreciate a help in this code. I have a DataSet with two tables; I need to create a relation based on two columns as primary key:
public DataSet GetAll()
{
string sql = $#"SELECT * FROM Journal ORDER BY JvNO, cYear;
SELECT * FROM JournalDetail ORDER BY JvNO, cYear";
using (SqlConnection connection = new SqlConnection(GlobalConfig.ConnString()))
{
connection.Open();
SqlCommand cmd = new SqlCommand(sql, connection);
SqlDataAdapter da = new SqlDataAdapter(sql, connection);
DataSet ds = new DataSet();
da.Fill(ds);
ds.Relations.Add("Journal_Batch", new DataColumn[] { ds.Tables[0].Columns["JvNO"], ds.Tables[0].Columns["cYear"] },
new DataColumn[] { ds.Tables[1].Columns["JvNO"], ds.Tables[1].Columns["cYear"] });
return ds;
}
}
Currently, I'm doing it like this and it's working but I need it with DataSet relation:
public DataSet GetJournalByID(int JVNO, int cYear)
{
string sql = $#"SELECT * FROM Journal WHERE JvNO = { JVNO } and cYear = { cYear };
SELECT * FROM JournalDetail WHERE JvNO = { JVNO } and cYear = { cYear };";
using (SqlConnection connection = new SqlConnection(GlobalConfig.ConnString()))
{
connection.Open();
SqlCommand cmd = new SqlCommand(sql, connection);
SqlDataAdapter da = new SqlDataAdapter(sql, connection);
DataSet ds = new DataSet();
da.Fill(ds);
return ds;
}
}
I don't know what's wrong with first code, as it returns all matching JvNO or Year.
i want to use the first one to fill two grids as follow:
private void GetData()
{
DataSet currentDs = new DataSet();
grdJournalDetails.DataSource = null;
grdJournal.DataSource = null;
JournalConnector journalConnection = new JournalConnector();
currentDs = journalConnection.GetAll();
grdJournal.DataSource = currentDs.Tables[0];
grdJournalDetails.DataSource = currentDs.Tables[1];
}
then with each row selected from grdJournal to display grdJournalDetails with related data without calling each time the second snippet of code.
i used Dapper and i'm familiar with it, but with devexpress grid, it have to be a datatable to use the event gvJournal_FocusedRowChanged, otherwise datarow returns always null;
Thanks for any suggestion.
I'm just learning and have written this code to copy data from one database to another (LOTSCON) = source, CON = destination.
The code all works and copies the data across, however it is based on checkboxes on a previous datagridview form.
The user selects which records to import, but also selects CHKCOMMUNITY which means this patient is a nursing home patient.
In the NEW table, there is a column nursinghome which is a bit type.
If the user ticks chkCommunity in the datagrid, I want to do the bulk copy but also make sure the nursinghome column in the destination table is set to 1.
So I'm not mapping an existing column in the source table..
How can I achieve this?
DO I just import then run a SQL string updating the column based on what I have just entered?
foreach (DataGridViewRow row in dataGridInst.Rows)
{
DataGridViewCheckBoxCell chkcell = row.Cells["chkimport"] as DataGridViewCheckBoxCell;
if (chkcell.Value != null)
{
if (Convert.ToBoolean(chkcell.Value) == true)
{
instid = Convert.ToInt32(row.Cells["clninstid"].Value);
iscommunity = Convert.ToInt32(row.Cells["chkcommunity"].Value);
using (SqlConnection lotscon = new SqlConnection(ConfigurationManager.ConnectionStrings["LOTSConnectionString"].ConnectionString))
{
using (SqlCommand cmd = new SqlCommand(#"SELECT Person.*, NEWinstitution.institutionname
FROM NEWinstitution INNER JOIN Person ON NEWinstitution.institutionid = Person.InstitutionID
WHERE person.institutionid = #instid", lotscon))
{
cmd.Parameters.Add("#instid", SqlDbType.Int).Value = instid;
using (SqlDataAdapter adapt = new SqlDataAdapter())
{
adapt.SelectCommand = cmd;
lotscon.Open();
DataSet ds = new DataSet();
adapt.Fill(ds);
DataTable dtgenerate = new DataTable();
dtgenerate = ds.Tables[0];
using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString))
{
using (SqlBulkCopy bc = new SqlBulkCopy(con))
{
bc.DestinationTableName = "tblpatient";
bc.ColumnMappings.Add("firstname", "pxfirstname");
bc.ColumnMappings.Add("lastname", "pxlastname");
bc.ColumnMappings.Add("address", "address");
bc.ColumnMappings.Add("suburb", "suburb");
bc.ColumnMappings.Add("medicareno", "medicarenumber");
bc.ColumnMappings.Add("personid", "dispenseid");
bc.ColumnMappings.Add("institutionname", "institutionname");
bc.ColumnMappings.Add("VAcardid", "repatnumber");
bc.ColumnMappings.Add("phonenumber", "phonenumber");
con.Open();
bc.WriteToServer(dtgenerate);
con.Close();
lotscon.Close();
}
}
}
}
}
}
}
}
I have code like this:
int selectedRow = dataGridView1.CurrentCell.RowIndex;
productds.Products[selectedRow].ItemArray = row.ItemArray;
// 1
ProductsTableAdapter padapter = new ProductsTableAdapter();
con.Open();
padapter.Update(productds.Products);
productds.Products.AcceptChanges();
adapter = new OleDbDataAdapter("SELECT * FROM Products ", con);
productds = new ProductDS();
adapter.Fill(productds, "products");
// 2
con.Close();
Here, where 1 is written I can see productds is changed so I can update it, but when I fill productds from db I can see there is no change. What should I do to commit changes to database? Database used is a .mdb file (MS Access).
Init method looks like this
con = new OleDbConnection("PROVIDER = MICROSOFT.JET.OLEDB.4.0; DATA SOURCE = C:\\Users\\me\\Downloads\\NWIND.MDB");
adapter = new OleDbDataAdapter("SELECT * FROM Products", con);
productds = new ProductDS();
adapter.Fill(productds, "products");
dataGridView1.DataSource = productds.Products;
con.Close();
Is there a way to map the results of a stored procedure to a generic list instead of a dataset/datatable?
Currently I follow these steps:
Execute stored procedure
Take the result in Dataset
Populate list from the Dataset.
Is there a way to eliminate step (2).
OleDbCommand cm = new OleDbCommand();
cm.Connection = AccessConnection();
cm.CommandType = CommandType.StoredProcedure;
cm.CommandText = "seltblContacts";
OleDbDataAdapter adp = new OleDbDataAdapter(cm);
DataTable dt = new DataTable();
adp.Fill(dt);
List<tblContacts> LstFile = new List<tblContacts>();
if (dt.Rows.Count > 0)
{
tblContacts t;
foreach (DataRow dr in dt.Rows)
{
t = PopulateContacts(dr);
LstFile.Add(t);
}
}
Yes of course you can do that - just execute your command and get back a reader, and then iterate over the rows in the result set and build up your objects:
using (OleDbCommand cm = new OleDbCommand())
{
cm.Connection = AccessConnection();
cm.CommandType = CommandType.StoredProcedure;
cm.CommandText = "seltblContacts";
List<tblContacts> LstFile = new List<tblContacts>();
using (OleDbReader reader = cm.ExecuteReader())
{
while(reader.Read())
{
tblContacts contact = new tblContacts();
// here, set the properties based on your columns from the database
contact.FirstName = reader.GetString(0);
contact.LastName = reader.GetString(1);
// etc.
LstFile.Add(contact);
}
reader.Close();
}
return LstFile;
}
For details on OleDbReader and how to use it, see this other SO question or find tons of tutorials and samples online using Bing or Google.