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[desc]
	
	
	
	
	
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LotusScript Data Object Guidelines <:P10,0,>

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LotusScript Data Object Guidelines <:P10,0,>

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@Ahead@<+@><:s><:I0,0,1080,0><:#240,8486>About using the LotusScript Data Object

<:s><:#600,8486>The LotusScript Data Object allows you to use LotusScript to access external databases. The actual implementation and features supported depend upon the ODBC driver and the back-end DBMS being accessed.

<:#400,8486>The LS Data Object contains three objects: Connection, Query, and ResultSet. Each represents several methods and properties which provide comprehensive data access services.

@Bhead title@<:s><:#220,8486>Writing a data access application in LotusScript

<:s><:#200,8486>The following are the basic steps of a LotusScript data access application:

@Numbered list@<:s><:#200,8486>DIM the Connection, Query, and ResultSet, for example:

@Indnt mono@<:#600,8486>DIM Conn AS NEW Connection<**>DIM Query AS NEW Query<**>DIM Res AS NEW ResultSet

@Numbered list@<:s><:#200,8486>Connect to the data source using ConnectTo, for example:

@Indnt mono@<:#200,8486>IF Conn.ConnectTo ( "school data" ) THEN

@Numbered list@<:s><:#200,8486>Set the Query connection, for example:

@Indnt mono@<:#200,8486>SET Qry.Connection = Conn

@Numbered list@<:s><:#200,8486>Specify the SELECT statement, for example:

@Indnt mono@<:#200,8486>Qry.SQL = "SELECT * FROM employee"

@Numbered list@<:s><:#200,8486>Set the ResultSet Query, for example:

@Indnt mono@<:#200,8486>SET Res.Query = Qry

@Numbered list@<:s><:#200,8486>Execute the result set, for example:

@Indnt mono@<:#200,8486>Res.Execute

@Numbered list@<:#200,8486>Get the data using GetValue, for example:

@Indnt mono@<:#800,8486><**>For k = 1 to Columns<**>PRINT "column:", k, Res.GetValue(k)<**>NEXT k<**>

@Bhead title@<:s><:#220,8486>About using the Connection Object

<:s><:#400,8486>The Connection object represents a set of methods for connecting to a data source and browsing the contents of databases. The following tips concern the Connection object:

@Bullet@<:#400,8486>If you attempt to connect to a data source that is not registered in ODBC.INI, the data source will be autoregistered.

@Bullet@<:#1000,8486>If the data source requires a user ID and a password, you should pass these parameters prior to attempting the connection, especially with scripts running on servers or in the background where user intervention is not possible or desirable. You can set the 
SilentMode property to prevent a user ID or password dialog from being started, if it is supported by your driver. The value DB_NOTSUPPORTED will be returned in this case.

@Bullet@<:s><:#600,8486>Connections are not internally cached. This means that a connection established with the Connection object is exclusive, i.e., it is not automatically reused whenever you attempt another identical connection (same data source, user ID and password).

@Bullet@<:#600,8486>If transactions are pending, a query result is still being retrieved, or other activity is taking place, a connection cannot be broken with the DisconnectTimeOut property. A disconnect will take place automatically if there is no activity between the script
 and the data source during the time out period.

@Bullet@Use IsConnected and IsTimedOut properties to test connections.

@Bullet@<:s><:#400,8486>You can use the Connection object to list available data sources, tables within databases, and fields within tables.

@Bullet@<:s><:#200,8486>You can use the Connection object to list and execute available stored procedures.

@Bullet@<:s><:#400,8486>When you use a connection object in more than one query at a time, a disconnect will disconnect all concurrent queries.

@Bhead title@<:s><:#220,8486>About the Query Object

<:s><:#400,8486>The Query Object represents a set of methods for storing a query. The following tips concern the Query object:

@Bullet@<:s><:#200,8486>The query must be expressed as a SQL statement.

@Bullet@<:#400,8486>If the SQL statement is not parameterized, it is checked for syntax errors. Otherwise, the syntax is not checked until the parameters are defined.

@Bullet@<:s><:#400,8486>The Query object must be linked to a data source connection. Use the Connection method in the Query object to establish a connection, for example:

@Indnt mono@<:#1000,8486>DIM Conn AS NEW Connection<**>DIM Query AS NEW Query<**>...<**><**>SET Query.Connection = Conn

@Bullet@<:#400,8486>Use QueryExecuteTimeOut to prevent a query from executing for a long period of time, for example, when you do not need the entire result set.

@Bullet@<:#600,8486>You can use NumParameters to get the number of parameters in the last query, if it uses parameters. You can use SetParameters to set individual parameter values with SetParameter, and GetParameter to read them.

@Bullet@<:#400,8486>The Query object extends the SQL standard parameterized query to include argument names, for example:

@Indnt mono@<:#200,8486>SELECT * FROM tablename WHERE date = ? AND amount = ?

@1st lev para@<:s><:#200,8486>can be defined as

@Indnt mono@<:#400,8486>SELECT * FROM tablename WHERE date = ?cutoffdate? AND amount = ?checkamount

@1st lev para@<:#200,8486>Use GetParameterName to retrieve these names.

@Bhead title@<:s><:#220,8486>About the ResultSet Object

<:s><:#400,8486>The ResultSet object represents a set of methods for executing a query and navigating through a result set. The following tips concern the ResultSet object:

@Bullet@<:s><:#400,8486>The ResultSet object must first have a valid Query object which is properly connected before a result set can be produced by the Execute method. For example:

@Indnt mono@<:#1400,8486>DIM Conn AS NEW Connection<**>DIM Query AS NEW Query<**>DIM Result AS NEW ResultSet<**>...<**>SET Query.Connection = Conn<**>SET Result.Query = Query<**>print result.Execute			'executes query

@Bullet@<:#600,8486>When a result set is available, only the referenced rows are retrieved and cached. This allows you to use some of the result set while the rest is transmitted through the network. To accelerate the process, use FetchBatchSize to set the number of rows retri
eved from the result set at a time.

@Bullet@<:#200,8486>You can set a CacheLimit for applications that don't expect large result sets.

@Bullet@<:#1000,8486>The result set is maintained in cache as a set of rows and columns. Therefore, you can navigate through the result set using the navigation methods, such as FirstRow, NextRow, etc. Accessing rows not in memory will result in a row fetch, and since result se
ts are usually only available sequentially, all the rows in-between the last cached row and the requested row must also be retrieved.

@Bullet@<:#800,8486>Use GetValue to retrieve values in columns of a result set. You may use the column's name or its ordinal value to access its value. Similarly, you can use FieldName, FieldInfo, FieldSize, and FieldNativeDataType to obtain information about a column's name a
t the data source, its table, its size, or its data format, respectively.

@Bullet@Use SetValue to update values in rows and columns. Set the value in the column, then update the row using UpdateRow. This begins a transaction on transaction-based databases. All subsequent Delete, Add, and UpdateRow transactions are part of the same transa
ction. You may then commit or rollback changes using the Close method. Alternatively, you can set a transaction database to AutoCommit, where any change that is made is automatically committed. 
<:p<* >>

@Bhead title@<:s><:#220,8486>Examples: About using the LotusScript Data Object

<:#200,8486>

@Chead@<:s><:#200,8486>Example 1

<:#200,8486>This example shows how the three objects are used in a data access application:

@Mono@<:#4800,8486>DIM Con as NEW Connection<**>DIM Qry AS NEW Query<**>DIM Res AS NEW ResultSet<**>DIM k, Columns AS integer<**><**>If Con.ConnectTo ( "school data") THEN<**>	SET Qry.Connection = Con<**>	Qry.SQL = "SELECT * FROM employee"<**>	SET Res.Query = Qry<**>	Res.Exec
ute<**>	Columns = Res.Columns<**>	<**>	DO UNTIL Res.TestEndOfData<**>		PRINT "=Row:", Res.CurrentRow, "="<**><**>		FOR k = 1 TO Columns<**>	 
	  PRINT "column:", k, Res.GetValue(k)<**>		NEXT k<**><**>		Res.NextRow<**>	LOOP<**><**>	ELSE<**>		PRINT "Could NOT connect to server"

@Mono@<:p<* >>

@Chead@<:s><:#200,8486>Example 2

<:s><:#400,8486>This example creates two result sets spaced five minutes apart. The results are then compared and any differences are printed:

@Mono@<:#2400,8486>DIM Con as NEW Connection<**>DIM Qry AS NEW Query<**>DIM Res1 AS NEW ResultSet<**>DIM Res2 AS NEW ResultSet<**>DIM nRow, kColumn, Columns AS integer<**><**>If Con.ConnectTo ( "school data") THEN<**>	SET Qry.Connection = Con<**>	Qry.SQL = "SELECT * FROM empl
oyee"<**>	SET Res1.Query = Qry<**>	Res1.Execute<**>	Res1.LastRow									'Fetch entire

@Mono@<:#1000,8486>	'wait here for 5 minutes (loop)<**>	<**>	SET Res2.Query = Qry<**>	Res2.Execute<**>	Res2.LastRow									 'Fetch entire

@Mono@<:#2000,8486><**>	FOR nRow = 1 to Res2.NumRows<**>		if Res1.GetValue( kColumn_ <<<;> Res2.GetValue( kColumn ) THEN<**>			PRINT nRow, kColumn, Res1.GetValue( kColumn ),<**>				Res.GetValue( kColumn )<**>		end if<**>	NEXT nRow<**><**>	ELSE<**>		PRINT "Could NOT connect to
 server"<**>	END IF

@Mono@<:s><:#200,8486>

@See also prnt@<:#200,8486><**>For more information, see Chapter 4 in the<+"> Programmer's Guide<-">.

@See also hlp@<:#110,8486>See also related topics

@Crossref@<:#200,8486>LotusScript Data Object

<+@><:#200,8486>

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