Nesting in ADS 10.1

Nesting in ADS 10.1

Postby kok joek hoa » Fri Feb 17, 2012 5:39 am

Dear All,

I need help.
which way is better when we save the data on advantage database server 10.1.0.028
Code: Select all  Expand view

// ads without nesting
function save()
    use x new share .....
    use y new share .....
    use z new share .....

    Try
        AdsBeginTransaction()
        select x
        if rlock()
            replace  field1 with 'abc'
        endif   
           
        replace_y() 
       
        select z
        if rlock()
            replace field with 'fff'
        endif   
        AdsCommitTransaction()

    catch
        AdsRollback()
    end

    dbcommitall()
       
return nil

   
       
static function replace_y()    
    local colddbf :=select()
   
    select y
    if rlock()
        replace field1 with '123'
    endif

    dbselectarea(colddbf)
return nil 

 



second way

Code: Select all  Expand view

// second way using nesting

function save()
    use x new share .....
    use y new share .....
    use z new share .....

    Try
        AdsBeginTransaction()
            try
                AdsBeginTransaction()
                select x
                if rlock()
                    replace  field1 with 'abc'
                endif   
                AdsCommitTransaction()
            catch
                AdsRollback()
            end
   
            try
                AdsBeginTransaction()
                replace_y() 
                AdsCommitTransaction()
            catch
                AdsRollback()
            end 

            try
                AdsBeginTransaction()
                select z
                if rlock()
                    replace field with 'fff'
                endif   
                AdsCommitTransaction()
            catch
                AdsRollback()
            end
   
        AdsCommitTransaction()

    catch
        AdsRollback()
    end
    dbcommitall()
   
return nil 
       
       
static function replace_y()    
    local colddbf :=select()
   
    select y
    if rlock()
        replace field1 with '123'
    endif

    dbselectarea(colddbf)
return nil 

 


third

Code: Select all  Expand view


// third way using nesting

function save()
    use x new share .....
    use y new share .....
    use z new share .....

    Try
        AdsBeginTransaction()
            try
                AdsBeginTransaction()
                select x
                if rlock()
                    replace  field1 with 'abc'
                endif   
                AdsCommitTransaction()
            catch
                AdsRollback()   
            end

       
            replace_y() 

            try
                AdsBeginTransaction()
                select z
                if rlock()
                    replace field with 'fff'
                endif   
                AdsCommitTransaction()
            catch
                AdsRollback()
            end
   
        AdsCommitTransaction()
    catch
        AdsRollback()
    end
    dbcommitall()
   
return nil 
       
       
       
static function replace_y()    
    local colddbf :=select()
   
    try
        AdsBeginTransaction()
        select y
        if rlock()
            replace field1 with '123'
        endif
        AdsCommitTransaction()
    catch
        AdsRollback()
    end 

    dbselectarea(colddbf)
return nil 

 



thanks
kok
kok joek hoa
 
Posts: 117
Joined: Tue Jan 03, 2006 6:18 pm

Re: Nesting in ADS 10.1

Postby fraxzi » Sat Feb 18, 2012 12:21 am

Dear Kok,

I strongly suggest you use SQL MERGE to save data.. INSERT or UPDATE also fine.
Please refer to ADS documentation for the SQL syntax..
Kind Regards,
Frances

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Re: Nesting in ADS 10.1

Postby carlos vargas » Sat Feb 18, 2012 4:36 am

hi, i think what catch code is never used, no runtime error for user the error code. :-(

rlock o flock not trigger RTE Error.


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Re: Nesting in ADS 10.1

Postby kok joek hoa » Sat Feb 18, 2012 7:01 am

HI,

Thanks Fraxzi, I will try it.

Carlos, rlock or flock alway return true or false, so in my code I write :

if rlock()
replace xxxx with yyy
else
break
endif

so, when one of database fail, all database will rollback, and it run perfect in my code.

thank

Kok
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Posts: 117
Joined: Tue Jan 03, 2006 6:18 pm

Re: Nesting in ADS 10.1

Postby carlos vargas » Sun Feb 19, 2012 1:34 am

sorry, i dont see the break instruction.
:-)


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Re: Nesting in ADS 10.1

Postby kok joek hoa » Sun Feb 19, 2012 8:42 am

Hi Carlos,

yes, I don't write in sample, sorry.

Did you ever try to compare speeds ads using sql with normal way?

thanks

regards,

kok
kok joek hoa
 
Posts: 117
Joined: Tue Jan 03, 2006 6:18 pm


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