BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Question on cursor location property          BorlandTalk.com Forum Index -> Delphi Databases (ADO) View previous topic :: View next topic   Author Message Sunny Guest Posted: Wed Dec 10, 2003 3:39 am    Post subject: Question on cursor location property Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top Viatcheslav V. Vassiliev Guest Posted: Wed Dec 10, 2003 6:38 am    Post subject: Re: Question on cursor location property Client-side cursor fetches all rows into memory, server-side cursor works directly with DBMS, so it should be used with large datasets when caching all rows will consume too much memory. Executing updates/inserts/deletes client-side cursor uses SQL query that it creates, server-side cursor does updates/insertes/deletes directly into DBMS - so with server-side cursor it is possible to update row in table that has no primary key or unique key, client-side cursor may have problems with this. Server-side cursor does not support filter/sort. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Sunny" <sunny (AT) yahoo (DOT) com> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:3fd693f4 (AT) newsgroups (DOT) borland.com... Quote: Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top jacky Guest Posted: Wed Dec 10, 2003 7:10 am    Post subject: Re: Question on cursor location property In my case, a auto_number that will auto generate from database, which type of cursor I should use if I want to get this number before post ? Actually I have tried both, when cursor location set to be Client, I can't get the auto_number after post until I have requery, is it the true ? On the other hand, I set it to Server side cursor, this time I can get the auto_number after post, but some cases and exception occur "row value out of range". I am using PostgreSQL and delphi 7, could you give me some hints to solve it. Thanks your very much. Jacky "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> ¼¶¼g©ó¶l¥ó·s»D :3fd6bfd0$1 (AT) newsgroups (DOT) borland.com... Quote: Client-side cursor fetches all rows into memory, server-side cursor works directly with DBMS, so it should be used with large datasets when caching all rows will consume too much memory. Executing updates/inserts/deletes client-side cursor uses SQL query that it creates, server-side cursor does updates/insertes/deletes directly into DBMS - so with server-side cursor it is possible to update row in table that has no primary key or unique key, client-side cursor may have problems with this. Server-side cursor does not support filter/sort. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Sunny" <sunny (AT) yahoo (DOT) com> ÓÏÏÂÝÉ?ÓÏÏÂÝÉÌÁ ?ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅ? news:3fd693f4 (AT) newsgroups (DOT) borland.com... Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top Viatcheslav V. Vassiliev Guest Posted: Wed Dec 10, 2003 12:41 pm    Post subject: Re: Question on cursor location property Client-side cursor works with in-memoty cache and does not retrieve data after post. Server-side cursor has limited functionality (it does not support sort, filter and for some providers may be forward-only read-only). //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "jacky" <_jacky (AT) lauchuen (DOT) com_> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:3fd6c5c8$1 (AT) newsgroups (DOT) borland.com... Quote: In my case, a auto_number that will auto generate from database, which type of cursor I should use if I want to get this number before post ? Actually I have tried both, when cursor location set to be Client, I can't get the auto_number after post until I have requery, is it the true ? On the other hand, I set it to Server side cursor, this time I can get the auto_number after post, but some cases and exception occur "row value out of range". I am using PostgreSQL and delphi 7, could you give me some hints to solve it. Thanks your very much. Jacky "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> ¼¶¼g©ó¶l¥ó·s»D :3fd6bfd0$1 (AT) newsgroups (DOT) borland.com... Client-side cursor fetches all rows into memory, server-side cursor works directly with DBMS, so it should be used with large datasets when caching all rows will consume too much memory. Executing updates/inserts/deletes client-side cursor uses SQL query that it creates, server-side cursor does updates/insertes/deletes directly into DBMS - so with server-side cursor it is possible to update row in table that has no primary key or unique key, client-side cursor may have problems with this. Server-side cursor does not support filter/sort. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Sunny" <sunny (AT) yahoo (DOT) com> ÓÏÏÂÝÉ?ÓÏÏÂÝÉÌÁ ?ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅ? news:3fd693f4 (AT) newsgroups (DOT) borland.com... Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top DRS Guest Posted: Wed Dec 10, 2003 1:43 pm    Post subject: Re: Question on cursor location property jacky <_jacky (AT) lauchuen (DOT) com_> wrote in message 3fd6c5c8$1 (AT) newsgroups (DOT) borland.com Quote: In my case, a auto_number that will auto generate from database, which type of cursor I should use if I want to get this number before post ? For God's sake! You can't get something that doesn't exist. The database engine will not generate the new autonumber until a new record is posted. It's got nothing to do with cursor location. -- A: Top-posters. Q: What is the most annoying thing on Usenet? Back to top jacky Guest Posted: Thu Dec 11, 2003 2:31 am    Post subject: Re: Question on cursor location property thanks, i learn a lot from you, my friend ^^ "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> ¼¶¼g©ó¶l¥ó·s»D :3fd71575$1 (AT) newsgroups (DOT) borland.com... Quote: Client-side cursor works with in-memoty cache and does not retrieve data after post. Server-side cursor has limited functionality (it does not support sort, filter and for some providers may be forward-only read-only). //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "jacky" <_jacky (AT) lauchuen (DOT) com_> ÓÏÏÂÝÉ?ÓÏÏÂÝÉÌÁ ?ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅ? news:3fd6c5c8$1 (AT) newsgroups (DOT) borland.com... In my case, a auto_number that will auto generate from database, which type of cursor I should use if I want to get this number before post ? Actually I have tried both, when cursor location set to be Client, I can't get the auto_number after post until I have requery, is it the true ? On the other hand, I set it to Server side cursor, this time I can get the auto_number after post, but some cases and exception occur "row value out of range". I am using PostgreSQL and delphi 7, could you give me some hints to solve it. Thanks your very much. Jacky "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> ¼¶¼g©ó¶l¥ó·s»D :3fd6bfd0$1 (AT) newsgroups (DOT) borland.com... Client-side cursor fetches all rows into memory, server-side cursor works directly with DBMS, so it should be used with large datasets when caching all rows will consume too much memory. Executing updates/inserts/deletes client-side cursor uses SQL query that it creates, server-side cursor does updates/insertes/deletes directly into DBMS - so with server-side cursor it is possible to update row in table that has no primary key or unique key, client-side cursor may have problems with this. Server-side cursor does not support filter/sort. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Sunny" <sunny (AT) yahoo (DOT) com> ÓÏÏÂÝÉ?ÓÏÏÂÝÉÌÁ ?ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅ? news:3fd693f4 (AT) newsgroups (DOT) borland.com... Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top jacky Guest Posted: Thu Dec 11, 2003 6:30 am    Post subject: Re: Question on cursor location property oh, thanks your hits. i found that the database server has provided a function to get my last auto_number after posted record. but for example, i use "select * from customer where id = 0" and do append to create a record, after i post , i got an error message "row value out of range", is that my id has been change after post so i got this error ? if so, how to solve it when i need to append a record ? use client-side cursor ? thanks your very much and regards Jacky "DRS" <drs (AT) removethis (DOT) ihug.com.au> ¼¶¼g©ó¶l¥ó·s»D :3fd72314 (AT) newsgroups (DOT) borland.com... Quote: jacky <_jacky (AT) lauchuen (DOT) com_> wrote in message 3fd6c5c8$1 (AT) newsgroups (DOT) borland.com In my case, a auto_number that will auto generate from database, which type of cursor I should use if I want to get this number before post ? For God's sake! You can't get something that doesn't exist. The database engine will not generate the new autonumber until a new record is posted. It's got nothing to do with cursor location. -- A: Top-posters. Q: What is the most annoying thing on Usenet? Back to top Sunny Guest Posted: Thu Dec 11, 2003 8:58 am    Post subject: Re: Question on cursor location property Thanks for your answer. "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> ¦b¶l¥ó news:3fd6bfd0$1 (AT) newsgroups (DOT) borland.com ¤¤¼¶¼g... Quote: Client-side cursor fetches all rows into memory, server-side cursor works directly with DBMS, so it should be used with large datasets when caching all rows will consume too much memory. Executing updates/inserts/deletes client-side cursor uses SQL query that it creates, server-side cursor does updates/insertes/deletes directly into DBMS - so with server-side cursor it is possible to update row in table that has no primary key or unique key, client-side cursor may have problems with this. Server-side cursor does not support filter/sort. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Sunny" <sunny (AT) yahoo (DOT) com> ÓÏÏÂÝÉ?ÓÏÏÂÝÉÌÁ ?ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅ? news:3fd693f4 (AT) newsgroups (DOT) borland.com... Hi all, In the property "Cursor Location" in ADO component, there are two choices : clUseClient and clUseServer. I would like to know is the benefit of choosing clUseServer over clUseClient? Thanks in advance. Back to top DRS Guest Posted: Fri Dec 12, 2003 2:36 pm    Post subject: Re: Question on cursor location property jacky <_jacky (AT) lauchuen (DOT) com_> wrote in message [email]3fd80dfc (AT) newsgroups (DOT) borland.com[/email] Quote: oh, thanks your hits. i found that the database server has provided a function to get my last auto_number after posted record. but for example, i use "select * from customer where id = 0" and do append to create a record, after i post , i got an error message "row value out of range", is that my id has been change after post so i got this error ? if so, how to solve it when i need to append a record ? use client-side cursor ? First, please don't top-post. Second, I don't use PostgreSQL. One method, if your database doesn't autorefresh the record you just posted, is to put a timestamp field in the record, and do something like this: save Now in local variable save local variable value in the record's timestamp field fill in rest of the record and post do a SELECT on records where their timestamp field value = the local variable; that will naturally return only the record you just created. Otherwise do a Google search on this news group for the past two or three years and search on "Refresh" and "Requery". -- A: Top-posters. Q: What is the most annoying thing on Usenet? 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