Sorm for updating multipla database records

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Optimising the number of UPDATEs by grouping the distinct SET values can be done in a way which is compatible with most common SQL databases. FROM approach requires knowledge of the specific SQL database being used.

So is structured so that approaches which are generic across different SQL databases are expressed in a base class, and approaches which only work for specific SQL databases are expressed in a subclass.

A more effective solution to this problem is to attempt to reduce the number of UPDATE statements.

Let us start with a simple table: UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1200 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1200 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; UPDATE staff SET salary = 1200 WHERE name = ' Bob'; UPDATE staff SET salary = 1250 WHERE name = ' Jane'; UPDATE staff SET salary = 1200 WHERE name = ' Frank'; UPDATE staff SET salary = 1250 WHERE name = ' Susan'; UPDATE staff SET salary = 1200 WHERE name = ' John'; We are no longer setting all the salary fields to the same value, so we can’t collapse it into a single statement.

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Under the Data Protection Act 1998 and the Protection of Freedoms Act 2012, legal provisions exist that control and restrict the collection, storage, retention, and use of information in government databases. NATGRID would allow access to each individual's data ranging from land records, Internet logs, air and rail PNR, phone records, gun records, driving license, property records, insurance, and income tax records in real time and with no oversight.

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It is relatively straightforward to populate a table with multiple rows with just one query (or at least, far fewer queries than the number of rows desired).

So, given a list of updates to apply we could effect them using the following steps: So in the example above we can reduce five statements to four. But now the number of statements is no longer directly dependent on the number of rows requiring updates.

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