Equivalent Of Parameters.AddWithValue In MySqlClient?
Mar 10, 2011What is the equivalent of Parameters.AddWithValue in the MySqlClient?
I've tried Parameters.Add and it's not working, but AddWithValue gives me an error.
What is the equivalent of Parameters.AddWithValue in the MySqlClient?
I've tried Parameters.Add and it's not working, but AddWithValue gives me an error.
Basically Commands has Parameters and parameters has functions like Add, AddWithValue, and etc. In all tutorials i've seen, i usually noticed that they are using Add instead of AddWithValue.
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since it saves my coding time. So which is better to use? Which is safe to use? Does it improves performance?
I use codes below to inserts values to database by executing stored procedure.
Dim connstring As String = "dsn=test"
Dim oConn As Odbc.OdbcConnection = New Odbc.OdbcConnection(connstring)
Dim com As New Odbc.OdbcCommand("{? = call sp_test1(?,?,?,?)}", oConn)
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Let's say I have a MySql stored procedure that inserts a record with some nullable CHAR fields. In VB.NET if I don't check for Nothing (or Null in other languages), I get an exception from the db driver, so I write:
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("_name", if(name Is Nothing, "", name)).Direction = ParameterDirection.Input;
And this is the first thing I don't like; I'd like to pass Nothing and the driver knows it has to put NULL in the Db. But then, in the stored procedure, I have to check back the field if it is empty:
INSERT INTO mytable
(name, -- other 200 char fields)
VALUES
(NULLIF(_name, ''),
-- other 200 char fields
)
I have to check for nothingness/emptiness twice. Is there a better, more direct, way? Even worse, for non reference types (i.e: Integers) the check for nothingness makes no sense, since a primitive type can't be nothing (yes, I could set an Integer to a non meaningful value, say -1 for a positive id, but...).
Is it possible to use "IN" operator together with OleDbCommand.Parameters.AddWithValue ?
I am using Visual Studio 2008 and Microsoft Access 2000.
I have search online but find no solution on it. Below is my code:
Dim conn As New OleDbConnection
Dim cmd As New OleDbCommand
Dim Adapter As New OleDb.OleDbDataAdapter
Dim strSQL As String
Dim dsDoc As New DataSet
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Where there is 2 Document No inside parameter @Doc , i can't get any of them. When there is only 1 Document No, then it is ok.Is it possible to use "IN" operator together with OleDbCommand.Parameters.AddWithValue ?
How can I import "System.Data.MySqlClient" in visual basic.net?
When I'm typing that code it produce an underline to the code and having an error of undefined namespace.
I have the following VB code.Dim cmd As New MySqlCommand("SELECT code FROM decoder WHERE ann_id = @aid", conn) cmd.Parameters.AddWithValue("@aid", 1)Dim reader As MySqlDataReader = cmd.ExecuteReader()
The reader.Read() then gives me nothing, however, if I replace the code by.Dim cmd As New MySqlCommand("SELECT code FROM decoder WHERE ann_id = 1", conn) Dim reader As MySqlDataReader = cmd.ExecuteReader() reader.Read() gives the correct result. Tried using Add instead, doesn't help. What am I missing here?
I'm writing a query to select all records that has any part of parameter. I have one table called Employees. Some people have name like this: John David Clark If the parameter is
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I should be able to get result back as long as there's a match in the parameters. If I use Function Contains (q.FirstName & " " & q.LastName).Contains(employeeName), I will not get any result back if employeeName is "John Clark" Function Contains looks only for next words from left to right. It doesn't match a single word at a time. So that's why I used this in the Linq to SQL:
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I am getting error [07002] the # binded parameters < the # of parameters makers, i checked both parameters were perfect even though i am getting this error here is my code
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Error: MySql.Data.MySqlClient.MySqlException: #42000 You have an error in your SQL syntax
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error " Unable to cast object of type 'MySql.Data.MySqlClient.MySqlException' to type 'MySql.Data.MySqlClient.MySqlDataReader'. " ?
THIS IS THE CODE Ssql = "SELECT ItemID, Prodname, qty, Desc, Cost * FROM items ORDER BY ItemID ASC"
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I have the following code:
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I get the compiler error message: error BC30560: "MySqlConnection" ist im Namespace "MySql.Data.MySqlClient" nicht eindeutig. in English (I think): "MySqlConnection" is not unique in Namespace "MySql.Data.MySqlClient".
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VB.Net
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What will be it's equivalent in C# ?
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If Len(sPart1) <> PART1_LENGTH Then
Err.Raise(vbObjectError, , "Part 1 must be " & PART1_LENGTH)
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{
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[code]....
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Public Class MyServer
Public ReadOnly Property Name() As String
Get
Return "Whatever"
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What is the vb.net expression of this c# expression ?
Frame.GetController<ShowNavigationItemController>().CustomShowNavigationItem += new EventHandler<CustomShowNavigationItemEventArgs>(WindowController1_CustomShowNavigationItem);
I'm looking at some old ASP code that contains the following:
Set objDSE = GetObject("LDAP://RootDSE")
Set objSysInfo = CreateObject("adsysteminfo")
Set objUser= Getobject("LDAP://" & Replace(objSysInfo.UserName,"/","/"))
dtmValue = objUser.PasswordLastChanged
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This is for an intranet app that uses integrated authentication. Is there a replacement for the ASP adsysteinfo object? I can probably port most of the LDAP calls using System.DirectoryServices.DirectoryEntry, but is there a better/easier way to do this in ASP.NET (VB.Net or C#)? how to convert the ASP object properties to DirectoryEntry properties?
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