Updating sql database from an array
Example: Inserts are relatively straightforward, nothing real tricky here. If you have ever worked with traditional SQL INSERT statements, you will find the dbal.sql_build_array is a significantly easier way to execute these statements.Example: Update works similar to the Insert in php BB, except you must specify the record to be updated in lieu of creating a new one.
Go to Wikipedia (Row-major order) for details, but the important concept is how to take an n-dimensional array and “flatten” it into sequential physical storage.
Now you want to modify existant rows, add new ones and delete some of them.3. If you leave the Update instruction as it is, then you will update all existing rows into the Grid and not just the ones that have changes and that could cost a lot in terms of efficiency (Say for example you have 100 rows and only 5 have changes).
You want to save all info (updated ones and new ones) and discard in database the one that you deleted. Any suggestion around identifying the rows that have been changed?
This is important for procedural languages because it determines the algorithms used to access the array elements. It is quite common to see repeated groups used in SQL to attempt to simulate an Array.
An example of a repeated group is an employee table with a set of columns for dependents, as follows: This table has many problems.