OpenEdge Data Management: DataServer for Microsoft SQL Server

DataServer for MS SQL Server logic
The flow chart in Figure 2 illustrates the DataServer’s internal logic.
1
The user runs an OpenEdge
or WebSpeed application .
2
FOR EACH customer:
DISPLAY name.
END.
The DataServer
translates a statement
into SQL.
SELECT name
FROM customer.
3
The data source manager
receives the SQL statements
from the DataServer .
SELECT name
FROM customer.
Figure 2: DataServer logic
ODBC API
DataServer components
5
The client displays the
returned results .
Name
_______________
Second Skin Scuba
Match Point Tennis
Off The Wall
Pedal Power Cycles
The data source manager
compiles the request and
returns the results to the
client.
"Second Skin Scuba"
"Match Point Tennis"
"Off The Wall"
"Pedal Power Cycles"
As shown in Figure 2, when you execute an application that accesses a MS SQL
Server database, the compiler translates ABL or SpeedScript statements into their SQL
equivalents. The DataServer then issues the SQL statements to the ODBC driver
through the ODBC API. The driver, which provides the software mechanisms for
accessing and controlling the data source, processes the SQL statements, transfers
them to the data source manager, and returns the results to OpenEdge through the
ODBC API.
OpenEdge Data Management: DataServer for Microsoft SQL Server 39
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