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Webcast schedule
WEBCAST SCHEDULE

Today’s event will run one-hour long. Here are the expected times for each segment of the Webcast:

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Enterprise Integration with LotusScript -- Using the LC LSX with Precision and Performance

Andre Guirard, IBM Software Group

Enterprise Integration Team

http://www.lotus.com/ei


Agenda with Precision and Performance

  • Comparing LotusScript EI Tools

  • Lotus Connector Architecture

  • Using the LC LSX

    • High Performance Coding

    • Metaconnectors

    • Character Set Conversion

  • Advanced Code Example

    • Demonstrating the above.

  • Q & A


Comparing LotusScript Database Tools with Precision and Performance

  • LS:DO

    • ODBC / SQL queries

    • Limited Capabilities

    • Comes free with Notes/Domino

  • LSX for Lotus Connectors

    • Strategic - used in Domino, DECS, LEI, ESB

    • Better performance using native database APIs

    • 10 Connectors by Lotus

    • 3rd-party connectors...

    • Comes free with Notes 6/Domino

  • LSXLEI - no longer used

    • Use LSX LC for Scripted Activities

    • Migration tool available


LC LSX - Acronyms Explained with Precision and Performance

  • LC = Lotus Connectors

    • C++ API for accessing relational or relational-like data from a multitude of sources.

  • LSX = LotusScript eXtension

    • A library to let LotusScript call lower-level functions.


Enterprise Integration Architecture with Precision and Performance

Domino Clients

Domino Applications

Agents Scripts, Servlets...

Forms, Views, Pages, Frames

LC LSX

ESB

LEI

DCRs

DECS

Base

Premium

Lotus Connectors

Unstructured Data

Relational Data

ERPSystems

DominoData


LSX Classes with Precision and Performance

  • LCSession - Connector environment control

  • LCConnection - represents an instance of LC Connector

    • Connect method activates connections

    • Execute, Select, Call, Fetch, Insert, Update, Remove, ... methods perform standard database operations.

  • LCFieldlist - represents one or more "rows" of data.

    • Use to write and read tables and result sets.

    • Read and create metadata, indexes.

  • LCField - represents a single field in an LCFieldList.

    • An LCField can be a member of more than one field list.

  • LCStream

    • text and binary data, special data types, character set conversions.

  • LCCurrency, LCNumeric, LCDatetime

    • Higher precision than the built-in LotusScript types.

$1.00 US = 1,613,500.00 Turkey Liras(as of 2/26/03)


Earlier attempt to publish on this subject with Precision and Performance

Field & Stream Magazine

Editorial Office

108 10th Ave.

New York NY 10036

Dear Sir,

We regret that the enclosed material,

Using Fields and Streams for High Performance in the LC LSX

does not meet our current needs.

P.S. What planet are you from?


Establishing a Connection with Precision and Performance

Uselsx "*lsxlc" ' lsxlei is no longer used -- migration tool available.

Dim lcSes As New LCSession("sessionNameForLog") ' for scripted activities.

Dim con As New LCConnection("connectionDocName")

' name of LEI Admin connection document.or...

Dim lcSes As New LCSession ' (optional) all other cases.

Dim con As New LCConnection("connectorName")

' e.g. db2 or oledb

con.Database = ...

con.Username = ...

con.Password = ...

con.Metadata = ... ' table name goes here.

con.Connect


Selecting and Fetching All Records in a Table with Precision and Performance

Dim flds As New LCFieldList

con.Fieldnames = "Empno,Name" ' which fields we want (default=*)

Call con.Select(Nothing, 1, flds) ' selects all records in table/view

' select Empno,Name from Employees

' plus (bonus!) fills in the fieldlist with descs. of fields in result set.

Print flds.Fieldcount & " fields."

' read one record, loop until there's no next record

Do While con.Fetch(flds) > 0

' Process the record. Print values

' of Empno and Name fields.

Print flds.Empno(0) & ": " & flds.Name(0)

Loop

7 fields.

21234: Maharishi Mahesh Yogi

90922: Shirley MacLaine

50446: Richard Bach

...


Locating and Updating a Single Record with Precision and Performance

con.Writeback = True ' when we update, update the row just read.

Dim flds As New LCFieldList

Dim keys As New LCFieldList

Dim empNo As LCField

Dim count As Long

Set empNo = keys.Append("Empno", LCTYPE_TEXT)

empNo.Values = "90922"

empNo.Flags = LCFIELDF_KEY' this field is now a key for SELECT

count = con.Select(keys, 1, flds)

Print count & " matches found." ' prints -1 or 0 with some connectors.

' select * from Employees where Empno = "90922"

If count <> 0 Then

flds.Name = "Ms. Shirley MacLaine"

con.Update flds

' if not using Writeback, one of the flds list must have key flags.

End If


Good Stuff to Know with Precision and Performance

  • Different connectors have different properties.

  • Select uses a single table or view.

  • To write your own native command, use Execute.

  • Fetch reads the result set of Select, Call, or Execute.

  • To control which fields Select returns, use LCConnection.FieldNames (default = all fields).

  • To control which records Select finds, use "key field" flags in LCField objects, and/or LCConnection.Condition.

  • MapByName vs. by position.

  • Use Writeback for easy updates and record locking.

    • Update or Remove in writeback affects record just read.

    • In non-writeback, uses keys and Condition, like Select.

  • Use Order metaconnector to sort data, or native sorting.

  • NotesAgent.RunOnServer to centralize DB software/credentials.


High Performance Tips with Precision and Performance

  • Use shared LCField objects to avoid manual copying.

  • Read/write multiple rows of data at a time.

  • Perform field lookups before looping.

  • Enable connection pooling.


Compare Code - Field Sharing with Precision and Performance

' Copy all records from A to B.

' code omitted here to set up fieldlist BFlds.

A.Select(Nothing, 1, AFlds)

Do Until A.Fetch(AFlds) = 0

BFlds.AcctNo = AFlds.KeyCode(0)

BFlds.AcctName = UCase(AFlds.AcctID(0))

BFlds.LastPayment = AFlds.PayDate(0)

Call B.Insert(BFlds)

Loop

AFlds

KeyCode

AcctID

PayDate

text

text

date

BFlds

AcctNo

AcctName

LastPayment

text

text

date

LCFieldList

LCField

A.Select(Nothing, 1, AFlds)

BFlds.MapName(AFlds, "KeyCode,PayDate", "AcctNo,LastPayment")

BFlds.Append("AcctName", LCTYPE_TEXT)

Do Until A.Fetch(AFlds) = 0

BFlds.AcctName = UCase(AFlds.AcctID(0))

Call B.Insert(BFlds)

Loop

KeyCode

AcctID

PayDate

AFlds

text

text

date

BFlds

AcctNo

LastPayment

AcctName

text


Read/Write multiple rows with Precision and Performance

  • Goal: Reduce overhead by sending fewer, bigger packets of information.

  • Some connector back-ends support multiple-row operations.

  • If not, the LSX still allows a multiple-row call -- it's just not faster.

  • Not supported when using stored procedures.

  • Doesn't work in conjunction with Order metaconnector.


Compare Code - Multiple row fetch/update with Precision and Performance

Dim AFlds As New LCFieldList, BFlds As New LCFieldList

A.Select(Nothing, 1, AFlds)

BFlds.MapName(AFlds, "KeyCode,PayDate", "AcctNo,LastPayment")

BFlds.Append("AcctName", LCTYPE_TEXT)

Do Until A.Fetch(AFlds) = 0

BFlds.AcctName = UCase(AFlds.AcctID(0))

Call B.Insert(BFlds)

Loop

Dim AFlds As New LCFieldList(50), BFlds As New LCFieldList(50)

A.Select(Nothing, 1, AFlds)

BFlds.MapName(AFlds, "KeyCode,PayDate", "AcctNo,LastPayment")

BFlds.Append("AcctName", LCTYPE_TEXT)

Do

count = A.Fetch(AFlds, 1, 50)

If count > 0 Then

BFlds.AcctName = ArrayUCase(AFlds.AcctID)

Call B.Insert(BFlds, 1, count)

End If

Loop Until count = 0

Function ArrayUCase(x) As Variant

Redim result(Lbound(x) To Ubound(x)) As String

Dim i%

For i = Lbound(x) To Ubound(x)

result(i) = UCase(x(i))

Next

ArrayUCase = result

End Function


Look Before You Loop with Precision and Performance

  • Use LCFieldList.Lookup to get handles to LCField objects before entering a Fetch loop.

  • Saves overhead of repeatedly searching the fieldlist for a name.

  • The same LCField objects are used for each call to Fetch -- only the data changes.


Compare Code - Look Before You Loop with Precision and Performance

  • A.Select(Nothing, 1, AFlds)

  • BFlds.MapName(AFlds, "KeyCode,PayDate", "AcctNo,LastPayment")

  • BFlds.Append("AcctName", LCTYPE_TEXT)

  • Do

  • count = A.Fetch(AFlds, 1, 50)

  • If count > 0 Then

  • BFlds.AcctName = ArrayUCase(AFlds.AcctID)

  • Call B.Insert(BFlds, 1, count)

  • End If

  • Loop Until count = 0

  • A.Select(Nothing, 1, AFlds)

  • BFlds.MapName(AFlds, "KeyCode,PayDate", "AcctNo,LastPayment")

  • Dim BAcctName As LCField, AAcctID As LCField

  • BAcctName = BFlds.Append("AcctName", LCTYPE_TEXT)

  • AAcctID = AFlds.Lookup("AcctID")

  • Do

  • count = A.Fetch(AFlds, 1, 50)

  • If count > 0 Then

  • BAcctName.Value = ArrayUCase(AAcctID.Value)

  • Call B.Insert(BFlds, 1, count)

  • End If

  • Loop Until count = 0

AAcctID

text

BAcctName

AFlds

KeyCode

AcctID

PayDate

date

text

text

BFlds

AcctNo

LastPayment

AcctName


Connection Pooling with Precision and Performance

This goes before any LCConnection objects are created.

Dim session As New LCSession

session.ConnectionPooling = True

Generally stays on until a Notes/Domino restart happens. Setting to False doesn't clear existing connections in the pool. It just keeps new ones from joining it.

Note: manually commit to avoid dangling transactions.


Emptying a Connection Pool with Precision and Performance

Dim session As New LCSession

Call session.FlushPool

This method is not doc'ed, but is very useful.


Metaconnectors with Precision and Performance

  • Provide a layer of functionality between your program and the connector.

    • trace: log all interactions with the database

    • meter: record statistics of data transfer

    • order: sort data as it's read

    • ...

Set con = New LCConnection("order")

con.ConnectorName = "db2"

con.OrderNames = "fieldname"

vs

Set con = New LCConnection("db2")


Using the "order" Metaconnector with Precision and Performance

LCConnection

("order")

Dim con As New LCConnection("order")

LCConnection

("db2")

ConnectorName

con.ConnectorName = "db2"

con.OrderNames = "EMPNO"

OrderNames

Database

con.Database = "SAMPLE"

Metadata

con.Metadata = "EMPDATA"

...

Userid

Password

...

Many connectors have their own sorting capability which gives better performance than the metaconnector -- however, metaconnector offers more options.


Character Set Conversion with Precision and Performance

  • Conversion of LCStreams based on "code pages".

  • May not be possible, e.g. there is no ASCII code for

  • LC detects character set in use and converts automatically during read and write.

  • If LC guesses wrong, look at database and notes.ini settings (see technotes). If that doesn't work...

  • Use binary LCStream object (LCSTREAMFMT_BLOB) to convert manually in your code.

  • Methods to do "manual" conversion:

    • LCField.GetStream (from a field to a LCStream)

    • LCField.Convert (from a field to another field)

    • LCField.SetStream (from a stream to a field)

    • LCStream.Convert (from stream to another stream)


Intermediate binary buffer for character conversion with Precision and Performance

  • Suppose LC believes a text field to be in Windows Cyrillic (CP 1251), a.k.a. LCSTREAMFMT_IBMCP1251

  • You know the data are actually in Windows Greek (CP 1253, LCSTREAMFMT_IBMCP1253 ) and want to convert to Unicode to store in MS Access.

Dim buffer As LCStream

Dim srcFld As LCField

Dim destFld As New LCField(LCTYPE_TEXT)

Call destFld.SetStreamFormat( , , LCSTREAMFMT_UNICODE)

...

Set buffer = srcFld.GetStream(1, LCSTREAMFMT_BLOB) ' copy raw binary data.

buffer.Format = LCSTREAMFMT_IBMCP1253 ' change interpretation without replacing data.

Call destFld.SetStream(1, buffer) ' data are automatically converted to type of destFld.


DEMO with Precision and Performance

  • A simple application to copy data from Notes to DB2 and back.

  • Demonstrates:

    • field sharing

    • multiple row fetching

    • look before you loop

    • connection pooling

    • character set conversion

    • metaconnector for sorting

    • creating a table

  • Download demo database from LDD Sandbox

    • http://www.lotus.com/ldd

    • click "Sandbox"

    • search for "LC LSX"


"Create Metadata" Agent with Precision and Performance

' establish the parameters of the connection.

Dim con As New LCConnection("db2")

con.database = "SAMPLE"

...

con.Metadata = "EMPDATA"

con.Connect

' create field list with the columns we want to have in a new DB2 table.

Dim flds As New LCFieldList, aFld As LCField

Set aFld = flds.Append("EMPNO", LCTYPE_TEXT)

Call aFld.SetFormatStream(0, 10) ' ten chars max

Set aFld = flds.Append("LANGUAGE", LCTYPE_INT)

Set aFld = flds.Append("SURNAME", LCTYPE_BINARY)

Call aFld.SetFormatStream(, 250, LCSTREAMFMT_BLOB)

...

Set aFld = flds.Append("HOMEPHONE", LCTYPE_TEXT)

Call aFld.SetFormatStream(0, 20)

' delete the table if it exists -- if not, ignore resulting error.

On Error Resume Next

con.Drop LCOBJECT_METADATA

' create the table using the fieldlist defined above.

Call con.Create(LCOBJECT_METADATA, flds)


Export Agent - Create Connection to Notes with Precision and Performance

' Establish connection to current Notes database thru the LC.

Dim ses As New NotesSession

Dim db As NotesDatabase

Set db = ses.CurrentDatabase

Dim notesCon As New LCConnection("notes")

notesCon.Server = db.Server ' create LC connection to current database.

notesCon.Database = db.FilePath

notesCon.Metadata = "Employee" ' name/alias of Notes form

notesCon.MapByName = True

notesCon.Connect

' select all Notes documents that use this form.

Dim notesFlds As New LCFieldList

Call notesCon.Select(Nothing, 1, notesFlds)

Use the LC to access Notes so that the information is read in a form that can be written directly to the external database.


Notes Input Field List with Precision and Performance

EmpNum

EmpLang

FirstName

LastName

FullName

Phone

notesFlds

type text

type text

type text

type text

type text

type text


Export Agent - Look before you loop with Precision and Performance

Dim srcFName As LCField, srcLName As LCField

Dim srcFullName As LCField, srcLang As LCField

Dim empNo As LCField

Set srcLang = notesFlds.Lookup("EmpLang")

Set srcFName = notesFlds.Lookup("FirstName")

Set srcLName = notesFlds.Lookup("LastName")

Set srcFullName = notesFlds.Lookup("FullName")


Export Agent - Create Output Fieldlist with Precision and Performance

' make EMPNO and EmpNum point to the same field object. Likewise HOMEPHONE and Phone.

' This makes it unnecessary to copy them from one field list to the other.

Dim extFlds As New LCFieldList

Call extFlds.MapName(notesFlds, "EmpNum,Phone", "EMPNO,HOMEPHONE")

' for other fields, create independent LCField objects and add them to the list.

' we don't care what order they go in because extCon.MapByName is True.

' otherwise we'd use Insert to put them in the right order.

Dim destFName As LCField, destLName As LCField

Dim destFullName As LCField, destLang As LCField

Set destLang = extFlds.Append("LANGUAGE", LCTYPE_INT)

Set destFName = extFlds.Append("GIVENNAME", LCTYPE_BINARY)

Call destFName.SetFormatStream(, , LCSTREAMFMT_BLOB)

Set destLName = extFlds.Append("SURNAME", LCTYPE_BINARY)

Call destLName.SetFormatStream(, , LCSTREAMFMT_BLOB)

Set destFullName = extFlds.Append("FULLNAME", LCTYPE_BINARY)

Call destFullName.SetFormatStream(, , LCSTREAMFMT_BLOB)


Field Lists in Export Agent with Precision and Performance

EmpNum

EmpLang

FirstName

LastName

FullName

Phone

notesFlds

type text

type text

type text

type text

type text

type text

extFlds

EMPNO

HOMEPHONE

LANGUAGE

FULLNAME

GIVENNAME

SURNAME

type integer

type BLOB

type BLOB

type BLOB


Export Agent - Create Output Fieldlist with Precision and Performance

' Designate empNo as a key field (for the Update command).

empNo.Flags = empNo.Flags Or LCFIELDF_KEY

Default key match is "=".

Though this field is shared with the Notes field list, it doesn't affect reading from Notes because notesFlds is never used as the key list in Select.


Export Agent - Read and Write Data with Precision and Performance

Do While notesCon.Fetch(notesFlds, 1, 1)

' In Notes form English is string "EN" and Japanse is "JP", but DB2 table uses integer 0 and 1.

Select Case srcLang.Value(0)

Case "JP"

charCodeSet = LCSTREAMFMT_IBMCP932 ' MS-DOS PC Japanese Microsoft Shift-JIS

destLang.Value = 1

Case Else

charCodeSet = LCSTREAMFMT_ASCII ' regular ASCII characters

destLang.Value = 0

End Select

' Convert the Notes characters to the desired character code set for English or Japanese,

' and copy that data into the BLOB field (which does not convert them further because

' BLOBS don't have character sets associated with them).

Call destFName.SetStream(1, srcFName.GetStream(1, charCodeSet))

...

' Update the DB2 database. If the update fails, the record must not yet exist, so insert instead.

If extCon.Update(extFlds, 1, 1) = 0 Then

Call extCon.Insert(extFlds, 1, 1)

' it would be smart to do some error checking here in case the insert failed.

...

End If

Loop


Scan Agent - Create Connection with Precision and Performance

Dim extCon As LCConnection

Dim reply As Integer

Dim readCount As Long

reply = Messagebox("Would you like sorting with that?", MB_YESNO, "Scan DB2 Data")

If reply = IDYES Then

Set extCon = New LCConnection("order")

extCon.ConnectorName = "db2"

extCon.OrderNames = "EMPNO"

readCount = 1 ' only read one record at a time

Else

Set extCon = New LCConnection("db2")

readCount = 20 ' read up to 20 records simultaneously.

End If

extCon.database = "SAMPLE"

Order Metaconnector can't handle multiple row reads, so only use multiple row when not using sorting.


Scan Agent - Select Data & Get LCField Handles with Precision and Performance

' dimension field list to contain the max number of entries read simultaneously.

Dim extFlds As New LCFieldList(readCount)

Call extcon.Select(Nothing, 1, extFlds) ' select all records in the EMPLOYEE table

Dim i As Long, count As Long, charCodeSet As Long

' "Look before you loop"

Dim givenName As LCField, fullName As LCField, empNo As LCField, lang As LCField

Set givenName = extFlds.Lookup("GIVENNAME")

Set fullName = extFlds.Lookup("FULLNAME")

Set lang = extFlds.Lookup("LANGUAGE")

Set empNo = extFlds.Lookup("EMPNO")


Scan Agent - Loop to Read Data with Precision and Performance

Do

count = extcon.Fetch(extFlds, 1, readCount) ' fetch readCount records at a time.

For i = 1 To count

Select Case lang.Value(i-1)

Case 1 ' japanese character set

charCodeSet = LCSTREAMFMT_IBMCP932 ' MS-DOS PC Japanese Microsoft Shift-JIS

Case Else ' ascii character set

charCodeSet = LCSTREAMFMT_ASCII

End Select

Dim buffer As New LCStream

Dim rawBuffer As LCStream

Set rawBuffer = givenName.GetStream(i, LCSTREAMFMT_BLOB)

Call buffer.Convert(rawBuffer, 0, charCodeSet)

Print { givenName = "} & buffer.Text & {" [} & rawBuffer.Length & { bytes]}

Set buffer = fullName.GetStream (i, charCodeSet)

Set rawBuffer = fullName.GetStream(i, LCSTREAMFMT_BLOB) ' just to get the length in bytes

Print { fullName = "} & buffer.Text & {" [} & rawBuffer.Length & { bytes]}

Next

Loop Until count = 0


Additional Info with Precision and Performance

www.lotus.com/ei

  • Lotus Developer Domain - Enterprise Integration Forum www.lotus.com/ldd/eiforum.nsf

  • SearchDomino.com: Ask the Experts, Andre Guirard

  • http://searchdomino.techtarget.com/ateQuestion/0,289624,sid4_tax293289,00.html


Q & A with Precision and PerformanceSubmit your questions now by clicking on the “Ask a Question” button in the bottom left corner of

your presentation screen.

  • \

Thank you!

You can send additional questions to

Andre Guirard via [email protected]


Feedback
Feedback with Precision and Performance

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