Posts tagged sql server
Assuming you are searching for the name John, the following procedure will search all existing columns regardless
Dim x As Integer = 0 While x < DataGridView1.Rows.Count Dim y As Integer = 0 While y < DataGridView1.Rows(x).Cells.Count Dim c As DataGridViewCell = DataGridView1.Rows(x).Cells(y) If Not c.Value Is DBNull.Value Or Nothing Then If CType(c.Value, String) = "John" Then MessageBox.Show("Found!") End If End If System.Math.Min(System.Threading.Interlocked.Increment(y), y - 1) End While System.Math.Min(System.Threading.Interlocked.Increment(x), x - 1) End While MessageBox.Show("Search complete!") End Sub
assuming you have a datagridview that has data in it.
you want to avoid recalling sql from the database & just want to filter the datagrid.
you can do the following, What you need (1 datagridview (data), 1 button (search), 1 textbox (string to search), 1 variable to precise the criteria your searching for)
Dim findcrit as string Dim dt As DataTable = Ds_Pos.Employees Dim dv As New DataView(dt) Dim _RowFilter As String = "" Dim _FieldType = dt.Columns(findcrit).DataType.ToString Select Case _FieldType Case "System.Int32" _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'" Case "System.Int64" _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'" Case "System.Double" _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'" Case "System.String" _RowFilter = findcrit & " like '" & TextBox1.Text & "*'" End Select dv.RowFilter = _RowFilter EmployeesDataGridView.DataSource = dv
The cases are to cast the type of variable from any type to string because you can only use the method on string data types.
the idea is to move the content to a data table then filter then return it back to the datatable.
In Microsoft public newsgroups, I’ve noticed a recent increase in the number of questions that deal with how to connect from Visual Foxpro to SQL Server, and the problems related to making this connection. So I’ve decided to write this article to cover such an important topic.
There are two functions that can be used to establish a connection with the a remote SQL Server from Visual FoxPro:
The SQLConnect() Function
There are two ways to use the SQLConnect() function to connect to a remote data source, such as SQL Server. The first requires that you supply the name of a data source as defined in the ODBC Data Source Administrator applet of the Control Panel.
The following example creates a connection to a remote server using the ODBCNorthwind DSN:
hConn = SQLConnect(“ODBCNorthwind”, “sa”, “”)
The second way to use SQLConnect() is to supply the name of a Visual FoxPro connection that was created using the create connection command. The CREATE CONNECTION command stores the metadata that Visual FoxPro needs to connect to a remote data source.
The following example creates a Visual FoxPro connection named Northwind and then connects to the database described by the connection:
CREATE DATABASE cstemp
CREATE CONNECTION Northwind ;
DATASOURCE “ODBCNorthwind” ;
USERID “sa” ;
hConn = SQLConnect(“Northwind”)
The other function that can be used to establish a connection to a remote data source, such as SQL Server, is SQLStringConnect(). Unlike SQLConnect(), SQLStringConnect() requires a single parameter, a string of semicolon-delimited options that describes the remote data source and optional connections settings.
The valid options are determined by the requirements of the ODBC driver. Specific requirements for each ODBC driver can be found in that ODBC driver’s documentation.
The following table lists some commonly used connection string options for SQL Server:
|DSN||References an ODBC DSN.|
|Driver||Specifies the name of the ODBC driver to use.|
|Server||Specifies the name of the SQL Server to connect to.|
|UID||Specifies the login ID or username.|
|PWD||Specifies the password for the given login ID or username.|
|Database||Specifies the initial database to connect to.|
|APP||Specifies the name of the application making the connection.|
|WSID||The name of the workstation making the connection.|
|Trusted_Connection||Specifies whether the login is being validated by the Windows NT Domain.|
Not all of the options listed in the above table have to be used for each connection.
For instance, if you specify the Trusted_Connection option and connect to SQL Server using NT Authentication, there is no reason to use the UID and PWD options since SQL Server would invariably ignore them. The following code demonstrates some examples of using SQLStringConnect().
Note: You can use the name of your server instead of the string.
SQL Server 2000 code example:
hConn = SQLStringConnect(“Driver=SQL Server;Server=<SQL2000>;”+ ;
hConn = SQLStringConnect(“DSN=ODBCNorthwind;UID=sa;PWD=;Database=Northwind”)
Handling Connection Errors
Both the SQLConnect() and SQLStringConnect() functions return a connection handle. If
the connection is established successfully, the handle will be a positive integer. If Visual FoxPro failed to make the connection, the handle will contain a negative integer. A simple
call to the AERROR() function can be used to retrieve the error number and message. The following example traps for a failed connection and displays the error number and message using the Visual FoxPro MESSAGEBOX() function.
Visual FoxPro returns error 1526 for all errors against a remote data source. The fifth element of the array returned by AERROR() contains the remote data source-specific error.
#define MB_OKBUTTON 0
#define MB_STOPSIGNICON 16
hConn = SQLConnect(“ODBCNorthwind”, “falseuser”, “”)
IF (hConn < 0)
LOCAL ARRAY laError
MB_OKBUTTON + MB_STOPSIGNICON, ;
“Error ” + TRANSFORM(laError))
Disconnecting From SQL Server
It is very important that a connection be released when it is no longer needed by the application because connections consume valuable resources on the server, and the number of connections may be limited by licensing constraints.
You break the connection to the remote data source using the SQLDisconnect() function. SQLDisconnect() takes one parameter, the connection handle created by a call to either SQLConnect() or SQLStringConnect(). SQLDisconnect() returns a 1 if the connection was correctly terminated and a negative value if an error occurred.
The following example establishes a connection to SQL Server, and then drops the connection:
*hConn = SQLStringConnect(“Driver=SQL Server;Server=<SQL2000>;”+ ;
hConn = SQLConnect(“ODBCNorthwind”, “sa”, “”)
IF (hConn > 0)
MESSAGEBOX(“Connection has done”)
lnResult = SQLDisconnect(hConn)
IF lnResult < 0
ENDIF && lnResult < 0
ENDIF && hConn > 0
If the parameter supplied to SQLDisconnect() is not a valid connection handle, Visual FoxPro will return a run-time error (#1466). Currently there is no way to determine whether a connection handle is valid without attempting to use it.
To disconnect all SQL pass through connections, you can pass a value of zero to SQLDisconnect().source: Sayed Geneidy
Well this is a great idea from Microsoft, but what if you want them all , or you want more then 200 rows like me , I am greedy , I like everything….
Any ways I was prepared to hack the registry for this one , but it seems you don’t really have to , and its in very simple to do and find…
Lesson 1 learned, late nights and SQL don’t mix.
Lesson 2 Change the Top 200 rows
Tools -> Options ->SQL Server Object Explorer, Expand this tree
And there you go change it to your desired amount, 0 = everything!
This is the youtube link for my demonstration :