sql insert records from one database to another database

Hello Experts,
I have 2 databases, each with 1 table.
Database_old , table_old
Database_new, table_new
Each table has name, address, email
In ASP NET, I want to be able to insert all of the records from database_new/table_new into database_old/table_old
Here is the connection string I use for Database_old
H_connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & Server.MapPath("") & "\app_data\ Database_old.accdb;"

Do I need to open a connection string for Database_new?

What is the sql to insert all records in Database_new/table_new into Database_old/table_old ?

Thanks,
WCGee
williecgAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
Yes, you would need to create a connection string for the new db as well.

Basically you need to do it in a few steps.

Open the connection string to the old DB . . . do a select * from old_table.
Execute the command as a datareader.

Build the DataReader (dr) with the following code:

StringBuilder sb = new StringBuilder();
While dr.Read()
{
  sb.AppendLine(String.Format
              ("insert into new_table (name, Address,Email) Values ('{0}', '{1}', '{2}')",
             dr["Name"].ToString(),
             dr["Address"].ToString(),
             dr["Email"].ToString());
}

Open in new window


Then open a connection the new database
Execute a command using stringBuilder.ToString() as NonExecuteQuery
Close your connections and cleanup.
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williecgAuthor Commented:
Thanks for your response.

I am a newbee and what I understand is limited.
I conceptually understand your logic, but I get tripped up on the specifics of the commands.
I am using asp net vb.
Could you please provide a code example to do what you described?
Thanks,

WCGee
0
Kyle AbrahamsSenior .Net DeveloperCommented:
This uses a SqlConnection, but just change your connection type / strings to be what you need:

'change the connection string
Dim conn as SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("OldDb").ConnectionString)
Dim cmdSelect as new SqlCommand = new SqlCommand("select * from old_table", conn)

'normally I'd use a try/catch . . . but this is for your example only:

conn.Open()
Dim dr as DataReader = cmdSelect.ExecuteDataReader()

Dim sb as StringBuilder = new StringBuilder()

while (dr.Read)
   sb.
 sb.AppendLine(String.Format
              ("insert into new_table (name, Address,Email) Values ('{0}', '{1}', '{2}'); ",
             dr("Name").ToString(),
             dr("Address").ToString(),
             dr("Email").ToString())

wend
conn.close()

'change the connection string
dim conn2 as SqlConnection = new SqlConnection(ConfigurationManager.ConnectionStrings("OldDb").ConnectionString)
dim cmdInsert as SqlCommand = new SqlCommand(sb.ToString(), conn2)
conn2.Open()
cmd2.ExecuteNonQuery()
conn2.Close()
 

Open in new window


That should do it for you.  Note I did this without a compiler so there might be some typos.  Let me know if you get any errors and/or have more issues.
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williecgAuthor Commented:
been on holiday. Thanks for the information, getting me in the right direction.
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