Wajih
Attached you'll find a small example how to store cells and query them
again. In addition you'll find useful code fragments in the ht4n test
suite, see https://github.com/andysoftdev/ht4n/tree/master/src/ht4n.Test.
-Andy
On Monday, April 9, 2012 8:15:00 AM UTC+2, Wajihullah Baig wrote:
>
> Ok I have just sent a feed back with a request for a sample code.
>
> Thank you
>
> Wajih
>
> On Thursday, March 29, 2012 8:32:46 PM UTC+5, Andy wrote:
>>
>> ..feel free to use the ht4n feedback form
>> http://ht4n.softdev.ch/index.php/feedback
>>
>> I'll send you a small getting started code fragment.
>>
>> -Andy
>>
>> On Mar 29, 5:30 pm, Andy <[email protected]> wrote:
>> > Hi Wajih
>> >
>> > the ht4n downloads and the API reference documentation are up-to-date,
>> > please seehttp://ht4n.softdev.ch/index.php/documentation/api-reference
>> >
>> > I guess I'm able to get the getting started and a small tutorial ready
>> > in the next few weeks.
>> >
>> > -Andy
>> >
>> > On Mar 29, 1:56 pm, Wajihullah Baig <[email protected]> wrote:
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > > Sorry for the incorrect subject line in my previous post.
>> >
>> > > Wajih
>
>
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public void GettingStarted() {
//
// Define the table schema in XML
//
var tableSchema = "<Schema><AccessGroup name=\"default\"><ColumnFamily><Name>MyCF</Name></ColumnFamily></AccessGroup></Schema>";
//
// Create Hypertable context and a client using the connection string specified
//
using( var context = Context.Create("Provider=Hyper; Uri=net.tcp://localhost") ) // for Thrift use "Provider=Thrift; Uri=net.tcp://localhost"
using( var client = context.CreateClient() )
//
// Open or create namespace
//
using( var ns = client.OpenNamespace("MyNamespace", OpenDispositions.OpenAlways | OpenDispositions.CreateIntermediate) )
//
// Open or create table
//
using( var table = ns.OpenTable("MyTable", tableSchema, OpenDispositions.OpenAlways) ) {
//
// Write some cells, using a table mutator
//
MutatorSpec mutatorSpec = null; // here configure the mutator, using new MutatorSpec(..) { ... };
using( var mutator = table.CreateMutator(mutatorSpec) ) {
// write some cells
var key = new Key { ColumnFamily = "MyCF" };
for( int n = 0; n < 1000; ++n ) {
key.Row = null; // force base85 encoded guid row id
mutator.Set(key, BitConverter.GetBytes(n));
}
}
//
// Read the previously written cells, using a table scanner
//
ScanSpec scanSpec = null; // here configure the scan specification, add any query predicates, using new ScanSpec(..) { ... };
using( var scanner = table.CreateScanner(scanSpec) ) {
var cell = new Cell();
while( scanner.Next(cell) ) { // caution - re-use cell instance
// do something with the cell
}
}
// or
using( var scanner = table.CreateScanner(scanSpec) ) {
Cell cell;
while( scanner.Next(out cell) ) {
// do something with the cell
}
}
// or
using( var scanner = table.CreateScanner(scanSpec) ) {
foreach( var cell in scanner ) {
// do something with the cell
}
}
}
}
