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Insert a Null value into a database table using Typed Dataset and Stored Procedure

Posted on 2004-09-06
Medium Priority
Last Modified: 2012-08-14
Dear friends a have a  problem!
When I try to insert a record in a table in my database which containes a null value (Empty property of a typed dataset) i get an exception!
 get {
       try {
       return ((System.DateTime)(this[this.tableActivities.LoanStartColumn]));
       catch (InvalidCastException e) {
Does anyboby have a hint?
Question by:a_ro_no
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LVL 12

Accepted Solution

vascov earned 672 total points
ID: 11988075
Use the Set<FieldName>Null method to make the field null.

Then, make sure that at the DB layer the field is allowed to be null.


LVL 10

Assisted Solution

123654789987 earned 664 total points
ID: 11988081
U cannot type cast a null field to a dateTime

Try this
s= this[this.tableActivities.LoanStartColumn]);
public static NullableDateTime ToNullableDateTime(string s)
                  if (s == null) return null;

                  if (s.Length == 0) return null;

                  return new NullableDateTime(Convert.ToDateTime(s));

The return value will be of nullabledateTime.

for a normal datetime field u cannot insert null

Assisted Solution

nj_buck earned 664 total points
ID: 11991570
It is prefereable to use a stored procedure for update/inserts.  In Oracle PL/SQL use the NVL function (in T-SQL its Coalesce) to change NULL to the proper value for the database schema.

The insert in the statement could use NVL something like this:

       NVL(DATEVALUE2, 0)

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