Javascript debugger
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Specifies a statement resource containing a result set.
Specifies the column in the result set. This can either be an integer representing the 0-indexed position of the column, or a string containing the name of the column.
Returns an integer containing the 0-indexed position of the named column in
the result set. If the specified column does not exist in the result set,
db2_field_num() returns FALSE
.