Updating database in c

Rob Smeets While it probably goes without saying, you need to include the auto increment column or you can cause an insertion anomaly with an overriding signature in the INSERT statement.

I'd suggest something here with a code example. id=45081 This won't work: INSERT INTO xxx(id,val) SELECT a,b FROM yyyy ON DUPLICATE KEY UPDATE val = VALUES(val)Taking value that will be inserted with VALUES() only works with INSERT INTO .... Here is a nice tip for INSERT INTO SELECT ON DUPLICATE KEY UPDATE.

That way, a new "note" is inserted of the "note" is changed, and the previous value is returned. The 'work around' suggested in the documentation to obtain the ID of a row updated using the DUPLICATE KEY UPDATE clause of an INSERT statement has a problem in addition to those mentioned by earlier posts.

Namely, if you are using INNODB storage engine and have a FOREIGN KEY referencing the primary key of the table being updated, this strategy may fail with: ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails ....

When replacing a document, the replacement document must consist of only field/value pairs; i.e. The replacement document can have different fields from the original document.

In the replacement document, you can omit the field, pass an entirely new document as the second argument to replace One() When replacing a document, the replacement document must consist of only field/value pairs; i.e. The replacement document can have different fields from the original document.

A way to make things work is to use a dummy column, so if you have a table with auto_increment column ID and unique key a,b and a smallint dummy column for instance, the query might look like this: INSERT INTO test (a,b) VALUES ('1','2') ON DUPLICATE KEY UPDATE ID=LAST_INSERT_ID(ID), Dummy = NOT dummy; Now, SELECT LAST_INSERT_ID(); will return the correct ID.

Example: Update-Select-Group By I have a table of totals 'v8totals' with Primary Key=(tid,tyy,tmm) and a table of records 'bbprepay'.

In the replacement document, you can omit the field, pass an entirely new document as the second argument to replace_one().PDF (US Ltr) - 38.2Mb PDF (A4) - 38.2Mb PDF (RPM) - 37.6Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 9.0Mb Man Pages (TGZ) - 197.4Kb Man Pages (Zip) - 305.9Kb Info (Gzip) - 3.5Mb Info (Zip) - 3.5Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 My SQL 5.7 Secure Deployment Guide statements are flagged as unsafe for statement-based replication.Such statements produce a warning in the error log when using statement-based mode and are written to the binary log using the row-based format when using statement against a table having more than one unique or primary key is also marked as unsafe. When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.That information, along with your comments, will be governed by DISQUS’ privacy policy.

Leave a Reply

  1. Chatting room in myanmar girl 02-Dec-2017 03:26

    This week, her former beau Chris Brown commented with the eyes emoji beneath Rihanna's revealing carnival outfit.

  2. datingsider danmark Nyborg 02-Oct-2017 10:41

    Find a girlfriend or lover in Mathabhanga, or just have fun flirting online with Mathabhanga single girls.

  3. steering mounted controls online dating 30-Jun-2017 07:16

    Well, in just a few days, someone who embodies our society’s problem with women is getting a new name: President.

  4. speed dating events colchester 26-Oct-2017 08:20

  5. Free nude just cams tv web cam 04-Jul-2017 13:42

    Intimacy on the Web, With a Crowd A cam model who calls herself Lacey works from her home in New Orleans, ...