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What is update method ?

update : used to update an object. If we want to update 2 columns,but still we need to set the data to all the remaining columns,otherwise it updateswith NULL values.
If we have 10 columns,if we want to update one column,then the remaining 9 columns will set to NULL.the solution for this problem is,do not use the session.update(),just load the data,set the new data for the specific columns and then commit.
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