Can anyone tell me why the below code would not commit the data to the access database table?
If I view the dtAccess datatable it shows correctly what I want to be written to Access but when I go Access and view the table, nothing has been written.
OleDbConnection myConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\"C:\\Database.accdb\";Persist Security Info=False;");
string queryString = "SELECT * from " + lblTable.Text;
//OleDbDataAdapter adapter = new OleDbDataAdapter(queryString, myConnection);
OleDbDataAdapter adapter = new OleDbDataAdapter();
DataTable dtAccess = new DataTable();
DataTable dtCSV = new DataTable();
dtCSV = ds.Tables[0];
// OleDbCommand cmd = new OleDbCommand("INSERT INTO " + lblTable.Text + "(ASIN) VALUES (1234)", myConnection); //this command works when used with cmd.executenonquery();
adapter.SelectCommand = new OleDbCommand("SELECT * from " + lblTable.Text, myConnection);
adapter.InsertCommand = new OleDbCommand("INSERT INTO " + lblTable.Text + " ([ASIN], [MAP Retail], [Style Number], [MSRP Retail]) VALUES (?,?,?,?)", myConnection);
myConnection.Open();
adapter.Fill(dtAccess);
dtAccess.Merge(dtCSV);
adapter.Update(dtAccess);
myConnection.Close();
Related
Hi I'm trying to search filter a datagridview by using a combobox and textbox.
I have successfully done so but it only works properly when I search for the ID column. Other columns just crash display the following message:
You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use
near 'Name LIKE 'd%'' at line 1
The d letter in that error message is just the letter I was trying to filter the search with.
Could somebody please help me solve this issue?
My code is below
string myConnection = "datasource=localhost;port=3306;username=root;password=;";
MySqlConnection conDatabase = new MySqlConnection(myConnection);
try
{
if (comboBoxSrchPatient.Text == "ID")
{
MySqlCommand cmd = new MySqlCommand("select * from clinic_inventory_system.patient WHERE ID LIKE '" + txtSearchPatient.Text + "%'", conDatabase);
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
else if (comboBoxSrchPatient.Text == "FIRST NAME")
{
MySqlCommand cmd = new MySqlCommand("select * from clinic_inventory_system.patient WHERE First Name LIKE '" + txtSearchPatient.Text + "%'", conDatabase);
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
else if (comboBoxSrchPatient.Text == "LAST NAME")
{
MySqlCommand cmd = new MySqlCommand("select * from clinic_inventory_system.patient WHERE Last Name LIKE '" + txtSearchPatient.Text + "%'", conDatabase);
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
else if (comboBoxSrchPatient.Text == "AGE")
{
MySqlCommand cmd = new MySqlCommand("select * from clinic_inventory_system.patient WHERE Age LIKE '" + txtSearchPatient.Text + "%'", conDatabase);
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
else if (comboBoxSrchPatient.Text == "CONTACT NUMBER")
{
MySqlCommand cmd = new MySqlCommand("select * from clinic_inventory_system.patient WHERE Contact Number LIKE '" + txtSearchPatient.Text + "%'", conDatabase);
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
Your field names contains spaces.
To use them in a query your need to enclose them between backticks (ALT+096)
MySqlCommand cmd = new MySqlCommand(#"select * from
clinic_inventory_system.patient WHERE `Last Name` LIKE ....";
Said that, consider, as soon as possible, to change your queries to use a parameterized query
using(MySqlCommand cmd = new MySqlCommand(#"select * from
clinic_inventory_system.patient
WHERE `First Name` LIKE #name", conDatabase);
{
cmd.Parameters.Add("#name", MySqlDbType.VarChar).Value = txtSearchPatient.Text + "%";
MySqlDataAdapter sda = new MySqlDataAdapter();
sda.SelectCommand = cmd;
DataTable dbdataset = new DataTable();
sda.Fill(dbdataset);
dataPatientGridView.DataSource = dbdataset;
}
In this way your code is safer because it is no more possible to build an Sql Injection attack against your db and, if the First Name contains a single quote, you don't have a syntax error again
First of all, with First Name, Last Name and Contact Number, you need to escape the columns correctly.
Since you're using MariaDB, you should use backticks (`) to escape the column names.
Secondly, your Age query fails because you can't perform a LIKE on a numeric column. You should use = (equals).
Hope that helps.
Also, considering switching to prepared statements if you're using data the user has provided directly in your SQL. At the moment, you're open to SQL Injection.
you should listen to Huw Jones.
you dont want to get audited by a security firm and have sql injection problems. Parameterized your query is mySql supports it.
I have to create charts with dynamic datasource, I have a code. It does not show error but the graph is also not visible on runtime.
Here out_table is the name of my table and ADX is one of its column.
code:
OleDbConnection con1 = new OleDbConnection(#"PROVIDER=Microsoft.ACE.OLEDB.12.0;DATA SOURCE=RS.accdb");
String sqlo = "Select ADX from " + out_table + "";
OleDbCommand myCommand = new OleDbCommand(sqlo, con1);
myCommand.Connection.Open();
OleDbDataReader myreader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
chart1.DataBindTable(myreader, "ADX");
thanks for helping me. I have solved this problem, and for others, here is the solution.
here, ds is dataset
OleDbConnection con1 = new OleDbConnection(#"PROVIDER=Microsoft.ACE.OLEDB.12.0;DATA SOURCE=RS.accdb");
String sqlo = "Select * from " + out_table + "";
OleDbDataAdapter da1 = new OleDbDataAdapter(sqlo, con);
DataSet ds = new DataSet();
da1.Fill(ds, in_table);
DataView firstView = new DataView(ds.Tables[0]);
chart1.Series[0].Points.DataBindXY(firstView, "ID", firstView, "ADX");
I want to read Excel file in c# using following code
string excelFileName = "Book2.xls";
string excelConnectString = #"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=Book2.xls;Extended Properties=""Excel 8.0;HDR=YES;""";
//string excelConnectString = #"Provider = Microsoft.Jet.OLEDB.4.0;Data Source = " + excelFileName + ";" + "Extended Properties = Excel 8.0; HDR=Yes;IMEX=1";
OleDbConnection objConn = new OleDbConnection(excelConnectString);
OleDbCommand objCmd = new OleDbCommand("Select * From [Sheet1$]", objConn);
OleDbDataAdapter objDatAdap = new OleDbDataAdapter();
objDatAdap.SelectCommand = objCmd;
DataSet ds = new DataSet();
objDatAdap.Fill(ds);
Everything is working fine.Now my requirement is to read the excel file something like below
SELECT A,B,D From [Sheet1];
The Select-command should look like this if you want to read A1 to D1:
SELECT * FROM [SHEETNAME_HERE$A1:D1]
Whole Code:
OleDbConnection con = new OleDbConnection(
"provider=Microsoft.Jet.OLEDB.4.0;data source="
+ XLS_FILE_NAME_AND_PATH_HERE
+ ";Extended Properties=Excel 8.0;");
StringBuilder stbQuery = new StringBuilder();
stbQuery.Append("SELECT * FROM [" + SHEETNAME_HERE + "$A1:D1]");
OleDbDataAdapter adp = new OleDbDataAdapter(stbQuery.ToString(), con);
DataSet dsXLS = new DataSet();
adp.Fill(dsXLS);
DataView dvEmp = new DataView(dsXLS.Tables[0]);
dataGridView1.DataSource = dvEmp;
DataTable Contents = new DataTable();
using (OleDbDataAdapter adapter = new OleDbDataAdapter("Select * From [Sheet1$]", objConn))
{
adapter.Fill(Contents);
}
Console.WriteLine(Contents.Rows[0][0]);
You can select a particular cell by passing the proper index.
You can just constuct use query like that:
SELECT FirstName, LastName, Mobile FROM [Sheet1$]
i.e. use first row values as column names.
I am trying to fill the oracle dataset == NULL;
I am using it with a .NET Framework 2.0 with C#
here is a system.data.oracleclient example
http://msdn.microsoft.com/en-us/library/system.data.oracleclient.oracledataadapter%28v=vs.71%29.aspx (this example is 1.1 but will work the same with 2.0)
(snippet from link)
OracleConnection conn = new OracleConnection("Data Source=Oracle8i;Integrated Security=yes");
Conn.Open;
OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "sp_pkg.getdata";
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new OracleParameter("a1", OracleType.Cursor)).Direction = ParameterDirection.Output;
cmd.Parameters.Add(new OracleParameter("a2", OracleType.Cursor)).Direction = ParameterDirection.Output;
DataSet ds = new DataSet();
OracleDataAdapter adapter = new OracleDataAdapter(cmd);
adapter.Fill(ds);
here is an ODP (recommended) example:
http://www.oracle.com/technology/sample_code/tech/windows/odpnet/DSPopulate/ViewProducts.cs.html
(snippet from link)
//Instantiate OracleDataAdapter to create DataSet
productsAdapter = new OracleDataAdapter();
//Fetch Product Details
productsAdapter.SelectCommand = new OracleCommand("SELECT " +
"Product_ID , " +
"Product_Name , " +
"Product_Desc , " +
"Category, " +
"Price " +
"FROM Products",conn);
//Instantiate DataSet object
productsDataSet = new DataSet("productsDataSet");
//Fill the DataSet with data from 'Products' database table
productsAdapter.Fill(productsDataSet, "Products");
//setting 'productsDataSet' as the datasouce and 'Products' table
//as the table to which the 'productsDataGrid' is Bound.
productsDataGrid.SetDataBinding(productsDataSet,"Products");
my excel
|Name|Telephone|
|Color|Car|
|John|Jon|
i need "|John|Jon|" how to select OleDbCommand? third row start
My Csharp Not Work Code:
ExcelCommand.CommandText = #"SELECT * FROM " + SpreadSheetName + " Where RowNumber > 3";
Thank you...
This worked for me. You can change the SELECT statement as you wish (specific rows, multiple columns, ...) to get a single result or a set of rows returned.
string connectionString = #"Provider=Microsoft.Jet.OleDb.4.0;Data Source=test.xls;";
connectionString += "Extended Properties=Excel 8.0;";
OleDbConnection con = new OleDbConnection(connectionString);
DataSet ds = new DataSet("stuff");
OleDbDataAdapter adapter = new OleDbDataAdapter();
// adapter.SelectCommand = new OleDbCommand("Select * from [Sheet1$A1:A100];", con);
// adapter.SelectCommand = new OleDbCommand("Select * from [Sheet1$];", con);
adapter.SelectCommand = new OleDbCommand("Select * from [Sheet1$] where [A] = 'John';", con);
adapter.Fill(ds);
foreach (DataRow dr in ds.Tables[0].Rows)
{
foreach (DataColumn dc in ds.Tables[0].Columns)
{
Console.WriteLine(dr[dc].ToString());
}
}
May be instead "RowNumber > 3" use "RowNumber = 3". "|John|Jon|" - third row.