42 lines
1.5 KiB
Python
42 lines
1.5 KiB
Python
#------------------------------------------------------------------------------
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# ReturnLongs.py
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# Returns all CLOB values as long strings and BLOB values as long raws. This
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# is only useful if the lengths of the CLOB and BLOB values are well known but
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# it can improve performance because there is no need to return to the database
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# to get the actual values.
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#------------------------------------------------------------------------------
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import cx_Oracle
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def OutputTypeHandler(cursor, name, defaultType, size, precision, scale):
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if defaultType == cx_Oracle.CLOB:
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return cursor.var(cx_Oracle.LONG_STRING, 80000, cursor.arraysize)
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if defaultType == cx_Oracle.BLOB:
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return cursor.var(cx_Oracle.LONG_BINARY, 100004, cursor.arraysize)
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connection = cx_Oracle.Connection("cx_Oracle/password")
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connection.outputtypehandler = OutputTypeHandler
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cursor = connection.cursor()
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print "CLOBS returned as longs"
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cursor.execute("""
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select
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IntCol,
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ClobCol
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from TestClobs
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where dbms_lob.getlength(ClobCol) <= 80000
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order by IntCol""")
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for intCol, value in cursor:
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print "Row:", intCol, "string of length", len(value)
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print
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print "BLOBS returned as longs"
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cursor.execute("""
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select
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IntCol,
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BlobCol
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from TestBlobs
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where dbms_lob.getlength(BlobCol) <= 100000
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order by IntCol""")
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for intCol, value in cursor:
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print "Row:", intCol, "string of length", value and len(value) or 0
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