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Class  >  dbreader  >  IsDBNull(string)
dbreader class : IsDBNull(string) method

Description

Returns a value that indicates whether the value is null.

Syntax

instance.IsDBNull(string columnName)

Arguments

ClassNameDescription
stringcolumnNameColumn name.

Return value

ClassDescription
boolWhether the value is null.

Sample code

1:

connection cnn = new connection("Data Source=c:\somedirectory\somedatabase.sqlite3;Version=3;");

2:

cnn.Open();

3:

command cmm = new command("select * from sometable where id < 100;", cnn);

4:

dbreader dbr = cmm.Reader(); // Command execution. Returns multi-line results.

5:

while(dbr.Read())

6:

bool isnull = dbr.IsDBNull("Appropriate column name");

7:

endwhile

8:

dbr.Release();

9:

cmm.Release();

10:

cnn.Close();

11:

cnn.Release();

Notes

Returns true if the specified column is null. Otherwise, returns false.

If the column corresponding to the argument does not exist, an exception, UnknownException, will be thrown.

Links for reference

None.

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