Difference between revisions of "POP DATASESSION"
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| − | '' | + | ==Purpose== |
| + | Restore the last 'pushed' data session | ||
| + | |||
| + | ==Syntax== | ||
| + | POP DATASESSION | ||
| + | |||
| + | ==See Also== | ||
| + | [[DATASESSIONLEVEL()]], [[PUSH DATASESSION]], [[RESTORE DATASESSION]], [[RESTORE RECORDVIEW]], [[SAVE DATASESSION]], [[SAVE RECORDVIEW]] | ||
| + | |||
| + | ==Description== | ||
| + | The POP DATASESSION command is used to restore the last data session saved with [[PUSH DATASESSION]]. Data sessions can be pushed and popped up to 256 levels deep and operate on a last in, first out basis. | ||
| + | |||
| + | The [[SAVE DATASESSION]] and [[RESTORE DATASESSION]] commands can also be used to save and restore the current data session, optionally saving and restoring from a memory variable. | ||
| + | |||
| + | ==Example== | ||
| + | <code lang="recital"> | ||
| + | ? datasessionlevel() // returns 0 | ||
| + | // save the current data session | ||
| + | push datasession | ||
| + | ? datasessionlevel() // returns 1 | ||
| + | // Carry out other operations with different data | ||
| + | // then save this second data session | ||
| + | push datasession | ||
| + | ? datasessionlevel() // returns 2 | ||
| + | // Carry out other operations with different data | ||
| + | // then restore the second data session | ||
| + | pop datasession | ||
| + | ? datasessionlevel() // returns 1 | ||
| + | // Carry out other operations with different data | ||
| + | // then restore the original data session | ||
| + | pop datasession | ||
| + | ? datasessionlevel() // returns 0 | ||
| + | </code> | ||
| + | |||
| + | [[Category:Documentation]] | ||
| + | [[Category:Commands]] | ||
| + | [[Category:Databases]] | ||
| + | [[Category:Lianja VFP Extensions]] | ||
| + | [[Category:VFP Command Extensions]] | ||
| + | [[Category:Lianja v3.0]] | ||
Latest revision as of 06:01, 19 March 2018
Contents
Purpose
Restore the last 'pushed' data session
Syntax
POP DATASESSION
See Also
DATASESSIONLEVEL(), PUSH DATASESSION, RESTORE DATASESSION, RESTORE RECORDVIEW, SAVE DATASESSION, SAVE RECORDVIEW
Description
The POP DATASESSION command is used to restore the last data session saved with PUSH DATASESSION. Data sessions can be pushed and popped up to 256 levels deep and operate on a last in, first out basis.
The SAVE DATASESSION and RESTORE DATASESSION commands can also be used to save and restore the current data session, optionally saving and restoring from a memory variable.
Example
? datasessionlevel() // returns 0 // save the current data session push datasession ? datasessionlevel() // returns 1 // Carry out other operations with different data // then save this second data session push datasession ? datasessionlevel() // returns 2 // Carry out other operations with different data // then restore the second data session pop datasession ? datasessionlevel() // returns 1 // Carry out other operations with different data // then restore the original data session pop datasession ? datasessionlevel() // returns 0
