mongodb: how to check update or delete is successful
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driver is pymongo;
question is: after issuing an update or delete operation, how to check data is successfully written to database? current method at hand seems to check modified_count and deleted_count value in the result; but operating on multiple documents needs to remember how many documents to update or delete and compare those numbers with those in result; this is cumbersome, and sometimes the number is not know beforehand (if the result tells me 5 documents are updated, does that mean there are only 5 documents matching the query and all updated, or there are 7 matching but 2 failed to update); in fact, the answer i want is a simple yes or no: yes means all data has been updated or deleted, and no means otherwise (either partial failure or total failure); are there any better ways to do this (such as checking exceptions, getting a numeric return value, etc.)?
mongodb pymongo
asked Nov 10 at 22:58
Cyker
2,66053245
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0
down vote
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driver is pymongo;
question is: after issuing an update or delete operation, how to check data is successfully written to database? current method at hand seems to check modified_count and deleted_count value in the result; but operating on multiple documents needs to remember how many documents to update or delete and compare those numbers with those in result; this is cumbersome, and sometimes the number is not know beforehand (if the result tells me 5 documents are updated, does that mean there are only 5 documents matching the query and all updated, or there are 7 matching but 2 failed to update); in fact, the answer i want is a simple yes or no: yes means all data has been updated or deleted, and no means otherwise (either partial failure or total failure); are there any better ways to do this (such as checking exceptions, getting a numeric return value, etc.)?
mongodb pymongo
asked Nov 10 at 22:58
Cyker
2,66053245
TheUpdateResultsalso hasmatched_count, why don't you use that?
– Arsen Davtyan
Nov 10 at 23:51
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
driver is pymongo;
question is: after issuing an update or delete operation, how to check data is successfully written to database? current method at hand seems to check modified_count and deleted_count value in the result; but operating on multiple documents needs to remember how many documents to update or delete and compare those numbers with those in result; this is cumbersome, and sometimes the number is not know beforehand (if the result tells me 5 documents are updated, does that mean there are only 5 documents matching the query and all updated, or there are 7 matching but 2 failed to update); in fact, the answer i want is a simple yes or no: yes means all data has been updated or deleted, and no means otherwise (either partial failure or total failure); are there any better ways to do this (such as checking exceptions, getting a numeric return value, etc.)?
mongodb pymongo
asked Nov 10 at 22:58
Cyker
2,66053245
driver is pymongo;
question is: after issuing an update or delete operation, how to check data is successfully written to database? current method at hand seems to check modified_count and deleted_count value in the result; but operating on multiple documents needs to remember how many documents to update or delete and compare those numbers with those in result; this is cumbersome, and sometimes the number is not know beforehand (if the result tells me 5 documents are updated, does that mean there are only 5 documents matching the query and all updated, or there are 7 matching but 2 failed to update); in fact, the answer i want is a simple yes or no: yes means all data has been updated or deleted, and no means otherwise (either partial failure or total failure); are there any better ways to do this (such as checking exceptions, getting a numeric return value, etc.)?
mongodb pymongo
mongodb pymongo
asked Nov 10 at 22:58
Cyker
2,66053245
asked Nov 10 at 22:58
Cyker
2,66053245
asked Nov 10 at 22:58
Cyker
2,66053245
asked Nov 10 at 22:58
Cyker
2,66053245
asked Nov 10 at 22:58
Cyker
2,66053245
2,66053245
TheUpdateResultsalso hasmatched_count, why don't you use that?
– Arsen Davtyan
Nov 10 at 23:51
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13
add a comment |
TheUpdateResultsalso hasmatched_count, why don't you use that?
– Arsen Davtyan
Nov 10 at 23:51
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13
The
UpdateResults also has matched_count, why don't you use that?– Arsen Davtyan
Nov 10 at 23:51
The
UpdateResults also has matched_count, why don't you use that?– Arsen Davtyan
Nov 10 at 23:51
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13
add a comment |
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The
UpdateResultsalso hasmatched_count, why don't you use that?– Arsen Davtyan
Nov 10 at 23:51
@ArsenDavtyan how about delete results then? and comparing numbers is still not intuitive when examining if an operation has failed; returning an exit code or throwing an exception is better imho;
– Cyker
Nov 11 at 0:13