Arguments: param-num obj type width &key db hstmt
This function creates a binding for a parameter for a parameterized sql statement.
A binding is the assigning of a block of memory to hold the value of a
given parameter. Whenever a parameterized sql statement is executed,
ODBC looks in the bindings and uses the current value found
there. param-num is the index of the parameter to be
bound. The first parameter is number 1 (not 0). obj is
the object to bind to the parameter. If obj is
nil then
an object will be allocated. type is the type of the value
stored in the object. It can be :long or
:int (treated the same), or :float or
:double (treated the same) or :char or
:varchar. If the type is :char
or :varchar then the width
specifies the maximum number of characters in the object.
The binding is associated with a particular statement handle for a
particular database connection. If hstmt is
true
then it is that statement handle. Otherwise if db is
true
then its default statement handle is used. If db is
nil
then the value of *default-database* is the database connection
whose statement handle is used.
Normally in a call to bind-parameter the value of
obj is nil which calls for
bind-parameter to allocate an object of the
appropriate type and return it as the result of the call. If
obj is
true then it should be an object allocated by a
previous call to bind-parameter for the same
type and width. The objects allocated by
bind-parameter are foreign objects of allocation
type :foreign-static-gc. It is the program's
responsibility to keep pointers to these bound objects so that they
aren't garbage collected before they are used for the last time.
The example of using bind-parameter in Binding input parameters in aodbc.htm shows what these bound objects look like from the Lisp perspective.
See aodbc.htm for more information on Allegro ODBC.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.