linq select distinct column values from datatable
Tài liệu Retrieving Column Default Values from SQL Server pdf
Ngày tải lên :
24/12/2013, 05:15
... following the word column in the
constraint_type column.
Once the default constraints have been identified, the overloaded constraint_keys column
contains the default value for the column. The default ... Online.
[ Team LiB ]
[ Team LiB ]
Recipe 10.3 Retrieving Column Default Values from SQL Server
Problem
The DataColumn object exposes a Default property. While the FillSchema( ) method ... DataAdapter returns schema information, it does not include the default values for
columns. You want to retrieve the default values of columns in a SQL Server table.
Solution
Use system stored procedures....
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Tài liệu Using the Get* Methods to Read Column Values doc
Ngày tải lên :
24/12/2013, 01:17
...
Using the Get* Methods to Read Column Values
Before I show you the other Get* methods that read column values, you need to know the
standard C# types and the values they support. You need to ... along with the underlying .NET type and the values that can
be stored in the C# type.
Table 9.3: STANDARD C# AND .NET TYPES
C#
TYPE
.NET
TYPE
VALUES
bool Boolean A Boolean true or false ... string GetString()
uniqueidentifier Guid GetGuid()
Note You can see the SQL Server types and the values supported by those types in Table
2.3 of Chapter 2, "Introduction to Databases."...
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Tài liệu Retrieving New Identity Column Values doc
Ngày tải lên :
21/01/2014, 07:20
... following high-level actions:
1. Retrieves rows from the Products table into a DataTable named
productsDataTable.
2. Adds a DataRow to productsDataTable.
3. Modifies the new DataRow.
4. Deletes ... program you'll notice the change in the ProductID DataColumn value
for a newly added DataRow from -1 to an actual value retrieved from the database.
...
myInsertCommand, with the ProductID column of the Products table being set to a
new identity value generated by the database.
2. The ProductID identity value is retrieved by the SELECT statement set in...
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Tài liệu Returning Strongly Typed Column Values doc
Ngày tải lên :
21/01/2014, 07:20
...
Returning Strongly Typed Column Values
Up to this point, you've retrieved column values from a DataReader only as generic
objects of the System.Object ... classes in C# are derived from the System.Object class.
I'll rewrite the while loop shown in the example in the previous section
to show how you
store column values as objects of the System.Object ... implicitly converted to a string and then
displayed.
That's fine for just displaying the column values, but what if you want to perform some
kind of calculation with a value? To do that,...
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Tài liệu Getting an Identity Column Value from SQL Server pptx
Ngày tải lên :
21/01/2014, 11:20
... stored procedure statement:
select Scope_Identity( ) CategoryId
The columns are updated from the data source to the row matching column names, taking
into account any column mappings that might ... property
values for the AutoIncrement column should both be set to -1 to prevent conflict with the
positive identity values generated by the data source.
The values created for an AutoIncrement column ... Getting an Identity Column Value from SQL Server
Problem
When you add a row into a SQL Server table that has an identity column, the value
assigned to the column in the DataTable is replaced...
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Tài liệu Formatting Column Values When Outputting Data as XML pptx
Ngày tải lên :
26/01/2014, 10:20
... mapping type for each column in the table.
foreach (DataTable table in ds.Tables)
foreach(DataColumn column in table.Columns)
{
if(tableAttributeRadioButton.Checked)
column. ColumnMapping = ... if(tableElementRadioButton.Checked)
column. ColumnMapping = MappingType.Element;
else if(tableHiddenRadioButton.Checked)
column. ColumnMapping = MappingType.Hidden;
}
// Set the mapping type for the ContactName column. ... column.
DataColumn dc = ds.Tables["Customers"].Columns["ContactName"];
if(columnAttributeRadioButton.Checked)
dc.ColumnMapping = MappingType.Attribute;
else if(columnElementRadioButton.Checked)...
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Copying Rows from One DataTable to Another
Ngày tải lên :
28/10/2013, 18:15
... 5.1 Copying Rows from One DataTable to Another
Problem
You have records in a DataTable that you need to copy to another DataTable.
Solution
Use the ImportRow( ) method of the DataTable to copy ... of the DataTable
using the row index.
ã
Use the Select( ) method of the DataTable.
ã
Use the RowFilter property of a DataView for the DataTable.
The sample code creates a source DataTable ... SqlDataAdapter da = new SqlDataAdapter(" ;SELECT * FROM Orders",
ConfigurationSettings.AppSettings["Sql_ConnectString"]);
DataTable dt = new DataTable( ORDERS_TABLE);
da.FillSchema(dt,...
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Tài liệu Displaying Columns from a Related DataTable doc
Ngày tải lên :
21/01/2014, 11:20
... Displaying Columns from a Related DataTable
Problem
You want to add a column to a DataTable that displays a value from a row in a related
table in the DataSet.
Solution
Use expression columns ... of all values
Count Number of values
Max Largest value
Min Smallest value
StDev Statistical standard deviation of all values
Sum Sum of all values
Var Statistical variance of all values ... code creates a calculated column in the Order Details table retrieving the
CustomerID from the parent Orders record for each Order Details record:
orderDetailsTable.Columns.Add(CUSTOMERID_FIELD,...
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Tài liệu Creating a Table in the Database from a DataTable Schema docx
Ngày tải lên :
21/01/2014, 11:20
... column collection in the source table.
foreach(DataColumn col in dt.Columns)
{
// Add the column.
sqlCmd.Append("[" + col.ColumnName + "] ");
// Map the source column ... Creating a Table in the Database from a DataTable Schema
Problem
You need to create a table in a database from an existing DataTable schema.
Solution
Use the CreateTableFromSchema( ) method shown ... sqlText = " ;SELECT * FROM [Orders]";
SqlDataAdapter da = new SqlDataAdapter(sqlText,
ConfigurationSettings.AppSettings["Sql_ConnectString"]);
DataTable dt = new DataTable( "Orders");...
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Tài liệu Retrieve Results from SQL Server by Using the DataTable Object docx
Ngày tải lên :
26/01/2014, 11:20
... OleDb.OleDbDataAdapter
Dim dtCust As DataTable = New DataTable( )
Dim strSQL As String
' Create the SQL String
strSQL = " ;Select CustomerID, CompanyName From Customers " & _ ...
Try-Catch-End-Try block of code.
Listing 3.3 frmHowTo3_2.vb: Loading a List Box By Using the DataTable
Object
Private Sub btnLoadList_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) ... the scene for using the list box in retrieving data in the next
How-To. Remember: By using the DataTable object, you can assign both the display
value and the data item to be tracked.
1....
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Tài liệu Báo cáo khoa học: Binding of N- and C-terminal anti-prion protein antibodies generates distinct phenotypes of cellular prion proteins (PrPC) obtained from human, sheep, cattle and mouse doc
Ngày tải lên :
19/02/2014, 02:20
... M, Ushiki YK & Shinagawa M (2005) The
N-terminal cleavage site of PrP
Sc
from BSE differs from
that of PrP
Sc
from scrapie. Biochem Biophys Res Com-
mun 328, 1024–1027.
37 Parchi P, Zou W, ... Homogenates of mice were prepared
using pooled whole brains from four individuals. Human
homogenates derived from pooled tissues obtained from
several different brain regions of six subjects. The ... cerebellum. Brain homogenates of cattle were obtained
from the brain stems of six animals. Pooled homogenates
of sheep brains were prepared from tissues taken from var-
ious regions of five animals. Furthermore,...
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Tài liệu Báo cáo Y học: Binding of gelsolin domain 2 to actin An actin interface distinct from that of gelsolin domain 1 and from ADF/cofilin pptx
Ngày tải lên :
22/02/2014, 07:20
... 268) q FEBS 2001
Binding of gelsolin domain 2 to actin
An actin interface distinct from that of gelsolin domain 1 and from ADF/cofilin
Celine Renoult
1
, Laurence Blondin
1
, Abdellatif Fattoum
2
, ... actin
sequences were selectively purified by affinity chromato-
graphy [23]. Anti-IgG antibodies labelled with alkaline
phosphatase were from Sigma.
Synthetic peptides derived from actin and gelsolin
sequences ... peptides
Rabbit skeletal muscle actin was isolated from acetone
powder [18], and stored in buffer G (2 m
M Tris, 0.1 mM
CaCl
2
0.1 mM ATP pH 7.5). Actin was selectively cleaved
by Staphylcoccus aureus...
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Be A Leader for God’s Sake -- From values to behaviors doc
Ngày tải lên :
07/03/2014, 19:20
... yourself about what values you need to
work on. If you are comfortable that you have your values in
place, then start by thinking about the behaviors that emerge
from the values. Spend some ... this
theory. Learning from their astute questions, I could see how
the leader’s foundational values yield beliefs, and how their
beliefs yield intentions to behave, and how from their
intentions ... The Wealth of Nations.
Smith wrote:
It is not from the benevolence of the butcher, the
brewer, or the baker that we expect our dinner,
but from their regard to their own interest. We
address...
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Báo cáo khoa học: Cytosolic phospholipase A2-a and cyclooxygenase-2 localize to intracellular membranes of EA.hy.926 endothelial cells that are distinct from the endoplasmic reticulum and the Golgi apparatus pdf
Ngày tải lên :
16/03/2014, 18:20
... V were obtained from Santa Cruz Biotechno-
logy (Santa Cruz, CA, USA). Mouse monoclonal anti-
vimentin serum was obtained from Sigma (Poole, UK).
Anti-caveolin sera were a gift from N. M. Hooper ... S100 serum was acquired from
Swant (Bellinzona, Switzerland). Secondary FITC- and
rhodamine-conjugated antibodies were from Sigma. Citi-
fluor mounting medium was obtained from Agar Scientific
(Stansted, ... monoclonal C4 actin antibody
was obtained from ICN Biomedicals (Irvine, CA, USA)
and Chemicon (Temecula, CA, USA). Rabbit polyclonal
anti-(annexin I) was a gift from E. Solito (Paris, France).
Mouse...
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Báo cáo khoa học: P-Glycoprotein is localized in intermediate-density membrane microdomains distinct from classical lipid rafts and caveolar domains potx
Ngày tải lên :
16/03/2014, 23:20
... microdomains different from
classical lipid rafts enriched in Src-family kinases. We demonstrate that
Brij-96 can selectively isolate the Pgp domains, separating them from the
caveolar and classical ... microdomains
represent distinct plasma membrane regions [27,28].
Caveolin-1, GM
1
ganglioside and cholesterol are
believed to be hallmarks of caveolae which are distinct
from the classical lipid ... density
gradient fractions of extracts from untreated CH
R
B30
cells and from cells treated with MbCD, and found
that cholesterol was effectively removed from the lipid
raft fractions obtained...
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