使用参数的 Oledb Insert 语句

Question

How do I insert into parameters from different tables using OleDB?

I have 3 tables: 1. itemTbl 2. crateTbl 3. contentTbl

itemTbl has: itemID, itemName, itemDesc crateTbl has: crateID, crateName contentTbl has: crateID, itemID, qty

contentTbl is the contents of the crate and the qty of each

I need it to select values in different tables I use WHERE . I have tried a similar code using a local db and service based db and they allow me, but OleDB doesn't let me use VALUES((SELECT))....

Error message:

System.Data.OleDb.OleDbException: 'Query input must contain at least one table or query.

My code:

cmd.Dispose();

cmd.CommandText = @"INSERT INTO contentTbl(crateID,itemID,qty) VALUES((SELECT crateTbl.crateID FROM crateTbl WHERE crateTbl.crateID=?),(SELECT itemTbl.itemID FROM itemTbl WHERE itemTbl.itemID = ?), ?)";
cmd.Connection = con;

cmd.Parameters.Add(new OleDbParameter("crateID", txtCrate.Text));
cmd.Parameters.Add(new OleDbParameter("itemID", txtItem.Text));
cmd.Parameters.Add(new OleDbParameter("qty", txtQty.Text));

con.Open();
cmd.ExecuteNonQuery();
con.Close();

MessageBox.Show("Done!");

da.SelectCommand = new OleDbCommand("SELECT * FROM contentTbl", con);
da.Fill(dt);

dgvContent.DataSource = dt;

Answer 1

The error message is quite descriptive. Access doesn't support subqueries without a main query, so change the syntax round to use one of the subqueries as your main query:

INSERT INTO  contentTbl(crateID,itemID,qty)
SELECT crateTbl.crateID,(SELECT itemTbl.itemID FROM itemTbl WHERE itemTbl.itemID = ?), ?
FROM crateTbl WHERE crateTbl.crateID=?

Note that parameters are passed by position, and rewriting this query does require you to re-order parameters:

cmd.Parameters.Add(new OleDbParameter("itemID", txtItem.Text));
cmd.Parameters.Add(new OleDbParameter("qty", txtQty.Text));
cmd.Parameters.Add(new OleDbParameter("crateID", txtCrate.Text));

If you don't like the main query/subquery syntax, you can go for a cross join too:

INSERT INTO  contentTbl(crateID,itemID,qty)
SELECT crateTbl.crateID, itemTbl.itemID, ?
FROM crateTbl,itemTbl  
WHERE crateTbl.crateID=? AND itemTbl.itemID = ?

(Parameter order needs to be adjusted again but you can figure that out).

Answer 2

I am not sure about the syntax. I always use it like (this is from VB, but C# should be similar) :

cmd.Parameters.Addwithvalue("crateID", txtCrate.Text)

Answer 3

I have tried this and it sort of works, but for some reason works only with values for the items table as ID's. If I have an ID (they're ints) that crateTbl has but itemTbl doesn't, it doesn't insert.

cmd.Dispose();
cmd.CommandText = @"INSERT INTO contentTbl(itemID,crateID,qty) SELECT itemTbl.itemID,(SELECT crateTbl.crateID FROM crateTbl WHERE crateTbl.crateID = ?), ? FROM itemTbl WHERE itemTbl.itemID=?";

cmd.Connection = con;

cmd.Parameters.Add(new OleDbParameter("itemID", txtItem.Text));
cmd.Parameters.Add(new OleDbParameter("qty", txtQty.Text));
cmd.Parameters.Add(new OleDbParameter("crateID", txtCrate.Text));

con.Open();
cmd.ExecuteNonQuery();
con.Close();

MessageBox.Show("Done!");

dt2.Clear();