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Don Burleson Blog 







How to extract a timestamp date from a LOB

Oracle Database Tips by Donald BurlesonFebruary 24,  2015

Raghu writes that he has a LOB datatype column which contains date and time information:

When I convert the LOB to char using to_char(dbms_lob.substr(oldstring, 18, 1)) where oldstring is the column name, I will get the value in the format '19/Feb/09 07:25 PM'.

But after that I was not able to convert it into timestamp as I am getting the message 'ORA-01858' related to non-numeric character when it is expecting a numeric character.

His solution was to use the to_timestamp built-in function to extract the data information from the LOB.

"to_timestamp(to_char(dbms_lob.substr(oldstring, 18, 1)), 'Fmdd-MON-yyyy HH:MI AM')"

Note that this same technique can be used to parse through a LOB seeking a date with Oracle regular expressions, and then extract and convent the string into a proper timestamp or date format. 

For complete details, see the great book "Advanced Oracle Utilities"



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