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- 1 Version 4.0 -- 5/1/89 dbrpcparam
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- NAME: dbrpcparam
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- FUNCTION:
- Add a parameter to a remote procedure call.
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- SYNTAX:
- RETCODE dbrpcparam(dbproc, paramname, status, type, maxlen,
- datalen, value)
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- DBPROCESS *dbproc;
- char *paramname;
- BYTE status;
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- dbrpcparam Version 4.0 -- 5/1/89 2
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- int type;
- DBINT maxlen;
- DBINT datalen;
- BYTE *value;
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- COMMENTS:
-
- o An application can call a stored procedure in two ways: by exe-
- cuting a command buffer containing a Transact-SQL EXECUTE
- statement or by making a remote procedure call ("rpc"). See
- the manual page for dbrpcinit() for a discussion of the differ-
- ences between these techniques.
- o To make a remote procedure call, first call dbrpcinit() to
- specify the stored procedure that's to be invoked. Then call
- dbrpcparam() once for each of the stored procedure's parame-
- ters. Finally, call dbrpcsend() to signify the end of the
- parameter list. This causes the server to begin executing the
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- specified procedure. You can then call dbsqlok(), dbresults(),
- and dbnextrow() to process the stored procedure's results.
- (Note that you will need to call dbresults() multiple times if
- the stored procedure contains more than one SELECT statement.)
- After all of the stored procedure's results have been pro-
- cessed, you can call the routines that process return parame-
- ters and status numbers, such as dbretdata() and dbretstatus().
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- o For an example of a remote procedure call, see Example 8 in the
- DB-Library Reference Supplement.
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- PARAMETERS:
- dbproc - A pointer to the DBPROCESS structure that provides the
- connection for a particular front-end/server process. It
- contains all the information that DB-Library uses to manage
- communications and data between the front end and the server.
- paramname - A pointer to the name of the parameter to be
- invoked. This name must begin with the "@" symbol, which
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- dbrpcparam Version 4.0 -- 5/1/89 4
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- prefixes all stored procedure parameter names. As in the
- Transact-SQL EXECUTE statement, the name is optional. If it
- is not used, it should be specified as NULL. In that case,
- the order of the dbrpcparam() calls determines the parameter
- to which each refers.
- status - A one-byte bitmask of rpc-parameter options. So far,
- the only option available is DBRPCRETURN, which signifies
- that the application program would like this parameter used
- as a return parameter.
- type - The datatype of the parameter (e.g., SYBINT1, SYBCHAR,
- etc.).
- maxlen - For return parameters, this is the maximum desired byte
- length for the rpc parameter value returned from the stored
- procedure. maxlen is relevant only for values whose data-
- types are not fixed in length-that is, character, text,
- binary, and image values. If this parameter doesn't apply
- (i.e., if the type is a fixed length datatype such as
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- SYBINT2) or if you don't care about restricting the lengths
- of return parameters, set maxlen to -1. maxlen should also
- be set to -1 for parameters not designated as return parame-
- ters.
- datalen - The actual byte length of the rpc parameter value that
- gets sent to the stored procedure. datalen must be used with
- values whose datatypes are not fixed in length; that is,
- character, text, binary, and image values. The byte length
- should not count any null terminator. If this parameter
- doesn't apply (i.e., if the type is a fixed length datatype
- such as SYBINT2), set datalen to -1. If the value of the rpc
- parameter is NULL, you must set datalen to 0, even if the
- type is a fixed length datatype.
- value - A pointer to the rpc parameter itself. If datalen is 0,
- this pointer will be ignored and treated as NULL.
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- RETURNS:
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- dbrpcparam Version 4.0 -- 5/1/89 6
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- SUCCEED or FAIL.
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- SEE ALSO:
- dbnextrow, dbresults, dbretdata, dbretstatus, dbrpcinit,
- dbrpcsend, dbsqlok
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