Search MS Access and display in textboxes VB.Net - vb.net

Please assist. I wish to search the ID number from MS Access table.
If that ID number exists, I must display the firstname, surname, gender and DOB of the person that has ID = TextBox.Text, as follows:
Patient_FirstName - txbFirstName
Patient_Surname - txbSurname
Patient_Sex - txbGender
Patient_DOB -txbDOB
This data is all contained in a table called Patient.
My code is as follows:
Private Sub btnSearch_Click(sender As Object, e As EventArgs) Handles btnSearch.Click
dbProvider = "PROVIDER= Microsoft.ACE.OLEDB.12.0;"
dbSource = "Data Source = C:\Users\Siyabonga Kubeka\Documents\Academic Folder\Richfield Graduate Institute Of Technology\BSC GUIDES\BSC GUIDES\Semester 2\Programming 512 Tasks\HealthServiceSystem.accdb"
conn.ConnectionString = dbProvider & dbSource
conn.Open()
Dim dt As New DataTable
Dim ds As New DataSet
ds.Tables.Add(dt)
Dim da As New OleDbDataAdapter
da = New OleDbDataAdapter("Select * from Patient where ID like '%" & txbIdNumber.Text & "%'", conn)
da.Fill(dt)
txbFirstName.DataBindings.Add("Text", dt, "Patient.Patient_First_Name")
txbSurname.DataBindings.Add("Text", dt, "Patient.Patient_Surname")
txbDOB.DataBindings.Add("Text", dt, "Patient.Patient_DOB")
txbGender.DataBindings.Add("Text", dt, "Patient.Patient_Sex")
End Sub
I get this error but I cannot figure it out why:
System.Data.OleDb.OleDbException: 'No value given for one or more required parameters.'

I did get is right, see code below:
Private Sub btnSearch_Click(sender As Object, e As EventArgs) Handles btnSearch.Click
dbProvider = "PROVIDER= Microsoft.ACE.OLEDB.12.0;"
dbSource = "Data Source = C:\Users\Siyabonga Kubeka\Documents\Academic Folder\Richfield Graduate Institute Of Technology\BSC GUIDES\BSC GUIDES\Semester 2\Programming 512 Tasks\HealthServiceSystem.accdb"
Dim strSql As String = "Select * from Patient where Patient_ID=#PatientID"
conn.ConnectionString = dbProvider & dbSource
conn.Open()
Using cmd As New OleDbCommand(strSql, conn)
cmd.Parameters.AddWithValue("#PatientID", txbIdNumber.Text)
Dim reader As OleDbDataReader = cmd.ExecuteReader()
While reader.Read()
txbFirstName.Text += reader("Patient_First_Name").ToString()
txbSurname.Text += reader("Patient_Surname").ToString()
txbDOB.Text += reader("Patient_DOB").ToString()
txbGender.Text += reader("Patient_Sex").ToString()
End While
End Using
End Sub

Related

Register Form Issues VB.Net

I am having an issue when I am setting up this Register form.
My current code is this:
Public Class Form2
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
Dim MyDocumentsFolder As String
Dim TheDatabase As String
Dim FullDatabasePath As String
Dim ds As New DataSet
Dim da As OleDb.OleDbDataAdapter
Dim sql As String
Dim DBTest1 As String
Dim DBTestP1 As String
Dim cmd As New OleDbCommand(sql, con)
Dim connStr As String
Public Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim connection As New OleDb.OleDbConnection(connStr)
dbProvider = "Provider=Microsoft.ACE.OLEDB.12.0;"
TheDatabase = "\Robocopy_Test.accdb"
MyDocumentsFolder = "C:\Users\Dan\Desktop\WindowsApplication2"
FullDatabasePath = MyDocumentsFolder & TheDatabase
dbSource = "Data Source = C:\Users\Dan\Desktop\WindowsApplication2\Robocopy_Testaccdb1.accdb"
con.ConnectionString = dbProvider & dbSource
con.Open()
sql = "SELECT * FROM Robocopy"
da = New OleDb.OleDbDataAdapter(sql, con)
'da.Fill(ds, "Robocopy")
MessageBox.Show("Databse is Open")
DBTest1 = DBTest.Text
DBTestP1 = DBTestP.Text
'DBTest.Text = ds.Tables("Robocopy").Rows(0).Item(1)
'DBTestP.Text = ds.Tables("Robocopy").Rows(0).Item(2
sql = "INSERT INTO Robocopy(username,password) VALUES('" & DBTest1 & "','" & DBTestP1 & "')"
cmd.Connection = connection
connection.Open()
cmd.CommandText = sql
da.InsertCommand = cmd
da.InsertCommand.ExecuteNonQuery()
connection.Close()
'With cmd.Parameters
'.AddWithValue("usernamer", DBTest.Text)
'.AddWithValue("password", DBTestP.Text)
'.AddWithValue("email", txtsub.text)
'.AddWithValue("contactnum", txtau.text)
'End With
'cmd.ExecuteNonQuery()
End Sub
Public Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
con.Close()
MessageBox.Show("Database Is now Closed")
End Sub
End Class
I am having the issue at connection.open(). The error that I am having is
The ConnectionString property has not been initialized.
I have been trying for the past hour to find different ways to write to the database but to no prevail and I cannot figure this out.
[In response to Steve
My code after editing and still the same error
Imports System.Data.OleDb
Public Class Form2
Dim connection As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
Dim MyDocumentsFolder As String
Dim TheDatabase As String
Dim FullDatabasePath As String
Dim ds As New DataSet
Dim da As OleDb.OleDbDataAdapter
Dim sql As String
Dim DBTest1 As String
Dim DBTestP1 As String
Dim cmd As New OleDbCommand(sql, connection)
Dim connStr As String
Public Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim connection As New OleDb.OleDbConnection(connStr)
dbProvider = "Provider=Microsoft.ACE.OLEDB.12.0;"
TheDatabase = "\Robocopy_Test.accdb"
MyDocumentsFolder = "C:\Users\Dan\Desktop\WindowsApplication2"
FullDatabasePath = MyDocumentsFolder & TheDatabase
dbSource = "Data Source = C:\Users\Dan\Desktop\WindowsApplication2\Robocopy_Testaccdb1.accdb"
Me.connection.ConnectionString = dbProvider & dbSource
Me.connection.Open()
sql = "SELECT * FROM Robocopy"
da = New OleDb.OleDbDataAdapter(sql, connection)
'da.Fill(ds, "Robocopy")
MessageBox.Show("Databse is Open")
DBTest1 = DBTest.Text
DBTestP1 = DBTestP.Text
'DBTest.Text = ds.Tables("Robocopy").Rows(0).Item(1)
'DBTestP.Text = ds.Tables("Robocopy").Rows(0).Item(2
sql = "INSERT INTO Robocopy(username,password) VALUES('" & DBTest1 & "','" & DBTestP1 & "')"
cmd.Connection = connection
connection.Open()
cmd.CommandText = sql
da.InsertCommand = cmd
da.InsertCommand.ExecuteNonQuery()
connection.Close()
'With cmd.Parameters
'.AddWithValue("usernamer", DBTest.Text)
'.AddWithValue("password", DBTestP.Text)
'.AddWithValue("email", txtsub.text)
'.AddWithValue("contactnum", txtau.text)
'End With
'cmd.ExecuteNonQuery()
End Sub
Public Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
connection.Close()
MessageBox.Show("Database Is now Closed")
End Sub
End Class
Global variables could be very ....evil. Expecially if you name them with the same name of a local variable.
Me.connection is not the same variable connection declared as local variable inside the sub. You set the connection string on the global variable then use the local variable without any connection string
Change these two lines
Me.connection.ConnectionString = dbProvider & dbSource
Me.connection.Open()
removing the Me.
connection.ConnectionString = dbProvider & dbSource
connection.Open()
and don't open the connection two times.
In any case, you don't need the adapter at all to execute an insert command
Public Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
dbProvider = "Provider=Microsoft.ACE.OLEDB.12.0;"
dbSource = "Data Source = C:\Users\Dan\Desktop\WindowsApplication2\Robocopy_Testaccdb1.accdb"
Dim connStr = dbProvider & dbSource
DBTest1 = DBTest.Text
DBTestP1 = DBTestP.Text
sql = "INSERT INTO Robocopy(username,[password]) VALUES('" & DBTest1 & "','" & DBTestP1 & "')"
Using connection = New OleDb.OleDbConnection(connStr)
Using cmd = new OleDb.OleDbCommand(sql, connection )
connection.Open()
cmd.ExecuteNonQuery()
'With cmd.Parameters
'.AddWithValue("usernamer", DBTest.Text)
'.AddWithValue("password", DBTestP.Text)
'.AddWithValue("email", txtsub.text)
'.AddWithValue("contactnum", txtau.text)
'End With
'cmd.ExecuteNonQuery()
End Using
End Using
End Sub
I see also that you have commented out the Parameterized approach to your query. Please do yourself a favour and restore as soon as possible the parameters logic. It is a lot more safe and avoids numerous errors
Finally Password is a reserved keyword in Access.Use square brakets around it otherwise you will see an unexplicable "Syntax Error" in your insert command

Read data from a database in vb.net

So I used this piece of sample code to retrieve data from a MS Access Database and display it on a few textboxes on the form. The following error occurs -
# dr = cmd.ExecuteReader - Data type mismatch in criteria expression.
dr = cmd.ExecuteReader
This is the sample code -
Dim provider As String
Dim dataFile As String
Dim connString As String
Public myConnection As OleDbConnection = New OleDbConnection
Public dr As OleDbDataReader
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
provider = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source ="
dataFile = "C:\Users\example\Desktop\Data.accdb" ' Change it to your Access Database location
connString = provider & dataFile
myConnection.ConnectionString = connString
End Sub
Dim r As Random = New Random
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
myConnection.Open()
TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
Dim str As String
str = "SELECT * FROM Items WHERE (Code = '" & r.Next(1, 3) & "')"
Dim cmd As OleDbCommand = New OleDbCommand(str, myConnection)
dr = cmd.ExecuteReader
While dr.Read()
TextBox1.Text = dr("Description").ToString
TextBox2.Text = dr("Cost").ToString
TextBox3.Text = dr("Price").ToString
End While
myConnection.Close()
End Sub
Try this ..
str = "SELECT * FROM Items WHERE (Code = '" & (r.Next(1, 3)).ToString() & "')"
try this:
str = "SELECT * FROM Items WHERE (Code = '" & cStr(r.Next(1, 3)) & "')"
The table name in the file that you provided for download is "Table1" not "Items".
Change the query string to:
str = "SELECT * FROM Table1 where (Code = '" & r.Next(1, 3) & "')"

Syntax error (missing operator) in query expression 'Prod_Num ='

This Syntax error (missing operator) in query expression 'Prod_Num ='. always shows up when I'm trying to search an item in the database. Please help me.
Imports System
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Dim con As New OleDb.OleDbConnection
Dim cmd As OleDbCommand
Dim da As OleDb.OleDbDataAdapter
Dim ds As New DataSet
Dim dt As New DataTable
Dim sql As String
Dim dbp As String
Dim dbs As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
dbp = "Provider = Microsoft.ACE.OLEDB.12.0;"
dbs = "Data Source=" & Application.StartupPath & "/POS.accdb"
con.ConnectionString = dbp & dbs
con.ConnectionString = dbp & dbs
con.Open()
sql = "SELECT * FROM tblInventory"
da = New OleDb.OleDbDataAdapter(sql, con)
da.Fill(dt)
dgList.DataSource = dt
txtPNum.Focus()
End Sub
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
dt.Clear()
txtPNum.Text = ""
sql = "SELECT * FROM tblInventory WHERE Prod_Num =" & txtPNum.Text
da = New OleDb.OleDbDataAdapter(sql, con)
da.Fill(dt)
dgList.DataSource = dt
txtPName = dt.Rows(0).Item(1)
txtNOrder = dt.Rows(0).Item(2)
txtPRem = dt.Rows(0).Item(3)
txtPrice = dt.Rows(0).Item(4)
txtPNum.Focus()
End Sub
My guess is that you have problem here:
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
dt.Clear()
txtPNum.Text = "" ' <-----------------
sql = "SELECT * FROM tblInventory WHERE Prod_Num =" & txtPNum.Text
da = New OleDb.OleDbDataAdapter(sql, con)
da.Fill(dt)
dgList.DataSource = dt
txtPName = dt.Rows(0).Item(1)
txtNOrder = dt.Rows(0).Item(2)
txtPRem = dt.Rows(0).Item(3)
txtPrice = dt.Rows(0).Item(4)
txtPNum.Focus()
End Sub
Remove this line:
txtPNum.Text = ""
Since you always clears the txtPNum textbox's text before passing it to the query.
NOTE:
Don't forget to implement it via parameterized query. This is not a good approach.
See parameterized query examples:
Example 1
Example 2
Hope it helps!
does txtPNum.Text contain any data?
Why don't you try checking that, because if it is empty your running SQL statement is "SELECT * FROM tblInventory WHERE Prod_Num =" which would raise that error.
Also if the Prod_Num column is integer, perhaps you should use int(txtPNum.Text) if that value is a string, this would also prevent SQL Injection.
In addition to the problem with txtPNum.Text that others have pointed out, I would recommend a couple of other things:
Use parameterized queries to avoid SQL Injection.
Use Using blocks with your connection, and close the connection as soon as you are done. In your Form_Load, for example, you open the connection and leave it open. That is not good practice.
Example:
Imports System
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Dim con As OleDbConnection
Dim cmd As OleDbCommand
Dim da As OleDbDataAdapter
Dim ds As New DataSet
Dim dt As New DataTable
Dim dbp As String
Dim dbs As String
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
dbp = "Provider = Microsoft.ACE.OLEDB.12.0;"
dbs = "Data Source=" & Application.StartupPath & "/POS.accdb"
Using con As OleDbConnection = New OleDbConnection(dbp & dbs)
con.Open()
da = New OleDbDataAdapter("SELECT * FROM tblInventory", con)
da.Fill(dt)
dgList.DataSource = dt
End Using
txtPNum.Focus()
End Sub
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
dt.Clear()
Using con As OleDbConnection = New OleDbConnection(dbp & dbs)
con.Open()
da = New OleDbDataAdapter("SELECT * FROM tblInventory WHERE Prod_Num = #ProdNum", con)
da.SelectCommand.Parameters.AddWithValue("#ProdNum", txtPNum.Text)
da.Fill(dt)
dgList.DataSource = dt
End Using
txtPName = dt.Rows(0).Item(1)
txtNOrder = dt.Rows(0).Item(2)
txtPRem = dt.Rows(0).Item(3)
txtPrice = dt.Rows(0).Item(4)
txtPNum.Focus()
End Sub
I would also recommend adding some Try Catch blocks to handle errors, and you may need to convert the values you're assigning to text boxes if they're something other than String.

how to look for a field in different tables in vb.net using query

I Have a query in which i want to search in all the table for a common field using query below ismy code----
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Try
'Dim da As OleDb.OleDbDataAdapter
Dim dbprovider As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Taher\Documents\Visual Studio 2010\Projects\WindowsApplication1\WindowsApplication1\Database1.accdb;Persist Security Info=False;"
Me.con = New OleDb.OleDbConnection
Dim sqlquery As String = "SELECT * FROM **mba mca mscit** WHERE urno='" & TextBox2.Text & "';"
Dim command As New OleDb.OleDbCommand(sqlquery, con)
Dim reader As OleDb.OleDbDataReader
con.ConnectionString = dbprovider
con.Open()
reader = command.ExecuteReader()
reader.Read()
TextBox1.Text = reader(1).ToString
TextBox2.Text = reader(2).ToString
TextBox3.Text = reader(3).ToString
TextBox4.Text = reader(4).ToString
TextBox5.Text = reader(5).ToString
Catch ex As Exception
MsgBox("Not Found")
con.Close()
End Try
i want to search for urno in all the tables which have the fields in them with the same name....?
Assuming the tables mba, mca and mscit have the same columns, then
SELECT * FROM mba
WHERE urno=#urno
UNION
SELECT * FROM mca
WHERE urno=#urno
UNION
SELECT * FROM mscit
WHERE urno=#urno
and supply an SQL parameter (q.v.) for #urno

how to retrieve data from database using select query

I have to retrieve data in two TextBoxes but the data should belong to tokennum that I am getting from first text box. I have a total of three TextBoxes and one button. In a database called db1 I have a table named Table1 and two fields ser as serial number, tokennum for token number and name for name of employees.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim con As New OleDb.OleDbConnection
Dim dbProvider As String
Dim dbSource As String
Dim ds As New DataSet
Dim da As OleDb.OleDbDataAdapter
Dim sql As String
Dim a As Integer
dbProvider = "PROVIDER=Microsoft.Jet.OLEDB.4.0;"
dbSource = "Data Source = C:\Documents and Settings\trainee-ng-it\Desktop\Subhedar Sir\New Folder (2)\db1.mdb"
con.ConnectionString = dbProvider & dbSource
con.Open()
a = Val(TextBox1.Text)
sql = "SELECT Table1.ser FROM Table1 where Table1.token num=a"
da = New OleDb.OleDbDataAdapter(sql, con)
da = New OleDb.OleDbDataAdapter(sql, con)
da.Fill(ds, "db1")
MsgBox("Database is now open")
con.Close()
MsgBox("Database is now Closed")
End Sub
End Class
#dhruva sir:thanks for guidance,i corrected that but now how to proceed?how to get respective data in the correspoding textboxes?
Your sql query is wrong
sql = "SELECT Table1.ser FROM Table1 where Table1.token num=a"
It should be something like this :
sql = "SELECT Table1.ser FROM Table1 where Table1.tokennum=" & a
Although the 'Table1.token num' is wrong, there cannot be a space within a column name, I hope that was just a typo and have corrected the same in the second query.
"SELECT Table1.ser FROM Table1 where Table1.tokennum= " + a
This is a start, but your question is not very clear