CODEWITHSUNDEEP
c#sqlsql-serverdatagridview
Marek
Marek

Reputation: 3575

If SQL DB column is NULL insert into datagridview 0

Hello guys I have got this query that might have in columns klisluz.cena and klisluz.pocet null or DBNull (not sure) values.

May I ask how can I prevent in this sQuery for those columns if there was null so I can insert into datagridview 0 ?

As this is JOIN query I'm not sure where should I implement ISNULL(klisluz.pocet,0) and ISNULL(klisluz.cena)

DataTable dt = new DataTable();
string sZakce = string.Empty;
if (zakce != null && zakce.Text != null)
{
    sZakce = zakce.Text;
}

string sQuery = string.Format("SELECT zajsluz.akce, zajsluz.text, klisluz.cena,
  klisluz.pocet, klisluz.subkey, zajsluz.ID FROM zajsluz LEFT JOIN klisluz ON
  zajsluz.ID = klisluz.IDzajsluz WHERE zajsluz.akce= '{0}' and 
  ISNULL(klisluz.subkey, '" + vyberradek + "') = '" + vyberradek + "'
  GROUP BY klisluz.subkey, zajsluz.akce, klisluz.cena, zajsluz.text,
  klisluz.pocet, zajsluz.ID", sZakce);
SqlDataAdapter SDA = new SqlDataAdapter(sQuery, spojeni);
SDA.Fill(dt);
dtg_ksluzby.DataSource = dt;

Thank you for your time.

So far I tried this:

for (int i = 0; i < (dtg_ksluzby.Rows.Count - 0); i++)
{

    if (dtg_ksluzby.Rows[i].Cells["pocet"].Value == null ||
       (string)dtg_ksluzby.Rows[i].Cells["pocet"].Value == string.Empty)
    {
    dtg_ksluzby.Rows[i].Cells["pocet"].Value = 0;
    }
    if (dtg_ksluzby.Rows[i].Cells["cena"].Value == null ||
      (string)dtg_ksluzby.Rows[i].Cells["cena"].Value == string.Empty)
    {
    dtg_ksluzby.Rows[i].Cells["cena"].Value = 0;
    }
}

But got exception that those column names cannot be found.

Upvotes: 1

Views: 882

Answers (2)

Ronak Patel
Ronak Patel

Reputation: 2610

Try below query

string sQuery = string.Format("SELECT zajsluz.akce, zajsluz.text, klisluz.cena,
  ISNULL(klisluz.pocet,0) as [pocet], klisluz.subkey, zajsluz.ID FROM zajsluz LEFT JOIN klisluz ON
  zajsluz.ID = klisluz.IDzajsluz WHERE zajsluz.akce= '{0}' and 
  ISNULL(klisluz.subkey, '" + vyberradek + "') = '" + vyberradek + "'
  GROUP BY klisluz.subkey, zajsluz.akce, klisluz.cena, zajsluz.text,
  ISNULL(klisluz.pocet,0), zajsluz.ID", sZakce);

Upvotes: 1

Soner G&#246;n&#252;l
Soner G&#246;n&#252;l

Reputation: 98750

You can use ISNULL (Transact-SQL)

Replaces NULL with the specified replacement value.

Syntax;

ISNULL ( check_expression , replacement_value )

For example;

SELECT ...., ISNULL(klisluz.cena, 0), ISNULL(klisluz.pocet, 0)

Upvotes: 3

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