SASInstitute A00-280 : Clinical Trials Programming Using SAS 9 Exam
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Exam Number : A00-280
Exam Name : Clinical Trials Programming Using SAS 9
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SASInstitute Programming book
Writing the conclusion-consumer utility : SCL Programming issues
that you may use SAS part Language (SCL) with SAS/SHARE application to entry records through a SAS/SHARE server. SCL has the capacity to study and update SAS tables which are used at the same time as through other valued clientele or SCL purposes. For complete suggestions about SCL, see SAS component Language: Reference.
A concurrent SCL utility opens one SAS records table for update whereas different SAS operations (possibly in diverse SAS periods) have the same records table open for update. These other opens for update will also be done by way of other invocations of the first SCL software, by a special SAS software or SCL application, or even through a user who makes use of the FSEDIT or FSVIEW technique on the table.
This part describes here issues that be sure you consider when writing an SCL utility that updates records at the same time as:
Locking rows in SAS tables
Implications of row locking in SCL
Programming in the FSEDIT and FSBROWSE tactics
locating and fetching handle rows
Unlocking a row.
at last, see Appendix 4, "SAS part Language software," for an utility that makes use of SAS tables that include inventory and ordering assistance for every product in a keep. The intention of the software is to automate a device that develops orders and keeps the stock record while sales representatives simultaneously write orders for items.
Locking Rows in SAS Tables
A row in a SAS table is locked implicitly when it's study by means of a SAS system, a data step, or an SCL software. A lock on a row is held until a distinct row is read or unless the SCL software calls the release characteristic.
When a SAS desk is opened for update, only 1 row can be locked at a time. When a SAS desk is opened for replace a couple of time in the equal SAS session or in distinct SAS sessions (through a server), a distinct row can be locked by using every of the opens. for example, if two users are operating an SCL application that calls the OPEN function to open a SAS desk for update, row 7 will also be locked below one of the crucial opens whereas row 10 is locked under the other.
Implications of Row Locking in SCL
Row locking is a key consideration in concurrent SCL programming. After a lock on a row is released, your utility can now not make certain of the values that are contained in that row; another consumer could have already modified the values. Any statistics modifications that you simply make which are based on the ancient values can also hurt the statistics integrity of the system.
therefore, you have to certainly not assume that the information values in a given row will no longer trade in a shared table, even though most effective a very quick period of time has elapsed between consecutive reads and locks of the row.
Row locking may give a programmer a crucial capabilities. whereas an SCL utility has a row locked, no different SAS operation (primarily in an extra SAS session) can alter or delete that row. When each row in a SAS table can represent a particular illustration of a resource that the application have to govern, row locking offers a resource-particular, covered period of time in which the application can safely examine and regulate the state of the resource.
An illustration of a specific-useful resource instance is information about one in all your valued clientele or the variety of items of a particular category that's currently in stock. The trial
SCL software in the appendix in this book applies locks to its inventory table to maintain the appropriate inventory count number for each and every merchandise, besides the fact that a couple of sales representatives are simultaneously writing orders for those gadgets.
not like different SCL environments (corresponding to SAS/AF application and the FSVIEW process), the FSEDIT and FSBROWSE procedures give the SCL programmer a number of labeled sections for structuring an SCL application. The sequence wherein the FSEDIT and FSBROWSE approaches run some of those sections has a number of implications for concurrent SCL programming.
The INIT part is above all advantageous to functions that study and replace shared records. The preliminary values of the columns in a row (as right now stored in the SAS table) may also be preserved in SCL columns. preservation of initial values in SCL columns is crucial for applications that replace auxiliary tables which are in response to the PROC FSEDIT user's amendment or on the creation of a row in the fundamental desk (that is, the table that is detailed within the information= choice in the PROC FSEDIT remark.) (footnote 1) These SCL purposes typically need to function here tasks:
while the main or time period sections must validate the person's changes to the fundamental table's row in addition to update auxiliary tables, it is continually appealing that no row of an auxiliary table stay locked between executions of those sections. Such locks keep away from other clients or applications from editing the row so long as the person is on the simple desk's latest row.
Programming with the information table and records kind classes
The information desk and statistics form classes in SAS/AF body entries will let you specify an SCL entry to make use of for the mannequin SCL. This SCL entry is separate from the frame's SCL entry. mannequin SCL is typically used to initialize computed columns and to function error checking and records validation.
just like the FSEDIT procedure, the facts table and the statistics kind objects give the SCL programmer a couple of labeled sections for structuring the order through which pursuits will take place for each row in the table. These sections, which consist of INIT, main, and time period, operate in the equal method as defined in Programming with the FSEDIT and the FSBROWSE processes.
If assorted circumstances of the records desk or the statistics kind objects are displayed inside a single SAS/AF frame entry, the objects share information, then the model SCL for every data desk or statistics form runs one at a time and the software developer should bear in mind whether a previous object has a lock on a row that the present object makes an attempt to study or update. in addition, the body SCL might also even be operating on the shared data and timing in the frame could be essential. For extra information about when SCL labels are run, see "Controlling Execution within the SCL" and "summary of SCL Label operating" within the information Set information mannequin type beneath SAS/AF part Reference in online support.
locating and Fetching control Rows
SCL provides a collection of services that are advantageous for locating and fetching the required auxiliary desk observations in a knowledge-concurrent SCL software. youngsters, you should use caution with these features in applications that entry shared records. The return code, which is obtained directly from the called function or from the SYSRC feature, ought to be checked to make sure that a lock changed into received on the commentary or that an update turned into successful. The return price, which is generated with the aid of the macro invocation %SYSRC(_SWNOUPD), is generated when a fetch or replace feature fails to lock or update the remark since it is locked by way of an additional application.
The FETCHOBS table characteristic is valuable when the statement quantity can serve because the commentary identifier. remember that this characteristic accepts a relative observation quantity by way of default that might also or can also now not equate to the physical observation number. if you can delete observations within the auxiliary desk, you probably want to use the ABS alternative of the FETCHOBS function for absolute observation numbering.
The LOCATEC and LOCATEN table functions may be positive for discovering observations in small tables when the records can continue to be sorted through a different identifier (column) and a binary search is distinct. past these limits, because of the overhead of browsing with these SCL capabilities, remember to use the where and FETCH services to discover these observations. In a shared-statistics ambiance, every remark should be requested from the server and transmitted to the client's SAS session for the LOCATEC and LOCATEN functions to investigate.
The SYSRC characteristic need to be queried for warnings when the LOCATEC and LOCATEN functions find an statement as a result of these functions return simplest a nil-fine return code for both condition: remark discovered or observation no longer found. the following SCL program example illustrates checking whether the located statement is locked via an extra assignment:
if (gotrec<=0) then do;
/* handle commentary now not found */
else if (sysrc()=%sysrc(_swnoupd)) then do;
/* tackle observation locked */
observe: The LOCATEC and LOCATEN functions cannot function binary searches on compressed tables, SAS facts views, or SAS information data with deleted observations.
The extra general and always extra productive way to locate an statement is to use the the place characteristic followed via a FETCH feature name. The where clause is evaluated in the server's SAS session, and most effective the commentary that satisfies the the place clause is transmitted to the customer's SAS session.
If the the place clause doesn't find the requested observation, the FETCH function returns a -1 return code indicating that the conclusion of the desk has been reached. If the the place clause is cleared through issuing a null where function call, the subsequent FETCH call that the application issues fetches the first remark in the desk. The FETCH name, not the where clause, locks the commentary (if feasible). observe that the the place function returns a harmless warning, %SYSRC(_SWWREP), when the where clause is replaced.
The DATALISTC and DATALISTN preference-record capabilities support a shopper to opt for a valid commentary. These functions definitely fetch the whole selected commentary into the table records Vector (DDV) and lock the commentary (if viable). as a result of these features do not return a equipment return code, the SYSRC characteristic need to be queried for warnings. The DATALISTC and DATALISTN functions can cause the complete SAS desk to be examine, the place each commentary examine is transferred personally from the server to the customer SAS session.
anyway releasing a lock on the current observation by means of analyzing an extra commentary, an SCL software can additionally use the SCL characteristic unlock. unlock leaves the study-pointer at its current place in the table and does not replace the DDV.
in addition, the SCL OBSINFO function returns suggestions in regards to the simple table's present statement in an FSEDIT application. that you can query no matter if the observation has been deleted, locked, or newly created. An statement doesn't reap deleted popularity until the customer's DELETE command has run. therefore, if you specified the handle ENTER statement to force your leading section to run, the OBSINFO function will no longer return the deleted status when issued from the leading section (since the consumer's DELETE command has led to main to be run.) despite the fact, it's going to return a deleted status when the leading commentary or term part is run again.
In a concurrent SCL software, an auxiliary desk is any table aside from the one certain in the statistics= choice of the PROC FSEDIT statement.
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