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Hello everybody hope you are well.
I have a place on a project im working on that im struggling to get past. I'm basically gathering meta data of a song and assigning them to variables in VB.
I'm next trying to save this data to a SQL database with tables i have created in visual studio and im having trouble doing this. The problem lies within trying to link the VB variables into a SQL query. Any Ideas?
To link VB variables to an SQL query, you need to add parameters that store the variables and then use those parameters in your SQL command:
Using parameters
MyCommand = New SqlCommand("SELECT Height, Weight, DoB, Gender, FROM `User` WHERE Username = #Username", DatabaseConnection)
MyCommand.Parameters.AddWithValue("#Username", Username)
UPDATE: How to connect to database
'Leads to the database
Public Filename As String = $"{AppDomain.CurrentDomain.BaseDirectory}YourDatabase.accdb"
'The connection string is set
Public ConStr As String = $"PROVIDER=Microsoft.ACE.OLEDB.12.0;DATA Source = {Filename}"
'The connection to the database is defined
Public DatabaseConnection As OleDb.OleDbConnection = New OleDb.OleDbConnection(ConStr)
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I am getting unrecognized keyword when when I am running a query to join two of my sheets in excel.
Error - 2147467259 - Unrecognized keyword WHEN
This error is due to case statements, they are not accepted in JET ODBC.
I am using JET ODBC and querying within excel sheets.
Can anyone help write a proper case statement using JET ODBC syntax, i can't get this to work.
iif ([stack$].[business_name] = 'GELP'
AND [overflow$].[level] = 'Package' THEN [overflow$].[identifier1]) END AS standardized_identifier,
CASE statements are not supported in SQL when hitting Excel sheets. You are using the JET ODBC/OLEDB provider in Windows which has limited syntax.
Instead use the IIF() function which is similar syntax to Excel's If().
As an example, your first CASE would look like:
iif([stack$].[managementl6description] = 'GLOBAL EQUITY-LINKED PRODUCTS', 'GELP' , iif([stack$].[managementl6description] = 'EQUITY MARKETS', 'EQUITY MARKETS', iif([stack$].[managementl6description] = 'FOREIGN EXCHANGE', 'FIC Foreign Exchange', NULL))) AS business_name
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When I use the Cashier table or some other tables that have small amounts of records the process proceeds and table is inserted into the external database. But when I change the cashier into the transaction database (400k+ records), Visual Studio reports an error near "Transaction" Help would be appreciated thanks.
Cashier Database (working)
Dim query As String = "select * into MyDatabase2.dbo.Cashier from bos_primary_db.dbo.Cashier"
Transaction Database (not working)
Dim query As String = "select * into MyDatabase2.dbo.Transaction from bos_primary_db.dbo.Transaction"
This is the error message:
Incorrect syntax near the keyword 'Transaction'
this is probably because Transaction is a reserved word in SQL.
Depending on your RDBMS (that you didn't specify), there are ways to "escape" it:
for Sql Server, you should wrap reserved words in square brackets:
select * into MyDatabase2.dbo.[Transaction] from bos_primary_db.dbo.[Transaction]
For MySql you should use an apostrophe:
select * into MyDatabase2.dbo.`Transaction` from bos_primary_db.dbo.`Transaction`
For Oracle you should use double quotes:
select * into MyDatabase2.dbo."Transaction" from bos_primary_db.dbo."Transaction"
Note: You should always try to avoid using reserved words. This link describes my favorite way of do it.
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How do you get a vb.net program to send a session kill command to Oracle? I can do it in sqlplusw by just typing:
alter system kill session '45,30665';
In vb.net, I'm trying to do this with an oracle.dataAccess object:
oraConn As New OracleConnection("Data Source=db1;User ID=usr;Password=pw")
oraConn.Open()
Dim cmd As New OracleCommand
cmd.Connection = oraConn
cmd.CommandType = CommandType.Text
cmd.CommandText = "alter system kill session '45,30665';"
cmd.ExecuteNonQuery()
cmd.Dispose()
When it gets to the ExecuteNonQuery line, it throws an exception "ORA-00911: invalid character". I think it's expecting an SQL statement. I'm using VB Express 2008.
You don't want semicolons in statements that you're sending from a client. Get rid of the semicolon at the end of the alter system
cmd.CommandText = "alter system kill session '45,30665'"
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this is my code
sqlcommand=new sqlcommand("inset into table values('"+home.name'"+,'"+home.DOJ'")",con);
You're using the local default string conversion from DateTime (I assume) to string, and then hoping that's valid for SQL.
Additionally, your code has a SQL injection attack vulnerability.
Both of these can be fixed - and your code readability - can be improved using parameterized SQL:
using (var command = new SqlCommand(
"INSERT INTO Foo (Name, DOJ) Values (#Name, #DOJ)", connection))
{
command.Parameters.Add("#Name", SqlDbType.VarChar).Value = home.name;
command.Parameters.Add("#DOJ", SqlDbType.DateTime).Value = home.DOJ;
...
}
(Adjust the types accordingly, e.g. using SqlDbType.NVarChar and SqlDbType.DateTime2.)
Never put values directly into SQL like you were doing. Using parameterized SQL is a win all round.
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I use the AdventureWorks practice database attached to SQL Server 2012.
A simple statement like:
SELECT * FROM HumanResources.Shift;
gives me this error:
Msg 208, Level 16, State 1, Line 1
Invalid object name 'AdventureWorks2012'.
I also tried:
USE master
GO
SELECT * FROM HumanResources.Shift;
Received same error message. Any idea to why this is happening?
Is AdventureWorks2012 the name of a database or a table?
USE <database name>
means use the specified database to run the query against.
SELECT * FROM <table name>
means select all the rows from the specified table.
--Edit because of change in question--
You don't want to use Master, you want to use the name of your DB. Next, using the object explorer, I would make sure the table actually exists in the Database you created.