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Add libpq comment about how to determine the format used for passing

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binary values.

Add comments to libpq C function for parameter passing.
This commit is contained in:
Bruce Momjian 2008-06-23 21:10:49 +00:00
parent 01930cea03
commit 2296e29998
2 changed files with 13 additions and 3 deletions
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10
doc/src/sgml/libpq.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.258 2008/06/01 16:23:08 tgl Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.259 2008/06/23 21:10:49 momjian Exp $ -->
<chapter id="libpq"> <chapter id="libpq">
<title><application>libpq</application> - C Library</title> <title><application>libpq</application> - C Library</title>
@ -1397,6 +1397,14 @@ PGresult *PQexecParams(PGconn *conn,
If the array pointer is null then all parameters are presumed If the array pointer is null then all parameters are presumed
to be text strings. to be text strings.
</para> </para>
<para>
Values passed in binary format require knowlege of
the internal representation expected by the backend.
For example, integers must be passed in network byte
order. Passing <type>numeric</> values requires
knowledge of the server storage format, as implemented
in <filename>src/backend/utils/adt/numeric.c</>.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>

6
src/interfaces/libpq/fe-exec.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.195 2008/05/29 22:02:44 tgl Exp $ * $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.196 2008/06/23 21:10:49 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -976,12 +976,13 @@ PQsendQueryGuts(PGconn *conn,
goto sendFailed; goto sendFailed;
} }
/* construct the Bind message */ /* Construct the Bind message */
if (pqPutMsgStart('B', false, conn) < 0 || if (pqPutMsgStart('B', false, conn) < 0 ||
pqPuts("", conn) < 0 || pqPuts("", conn) < 0 ||
pqPuts(stmtName, conn) < 0) pqPuts(stmtName, conn) < 0)
goto sendFailed; goto sendFailed;
/* Send parameter formats */
if (nParams > 0 && paramFormats) if (nParams > 0 && paramFormats)
{ {
if (pqPutInt(nParams, 2, conn) < 0) if (pqPutInt(nParams, 2, conn) < 0)
@ -1001,6 +1002,7 @@ PQsendQueryGuts(PGconn *conn,
if (pqPutInt(nParams, 2, conn) < 0) if (pqPutInt(nParams, 2, conn) < 0)
goto sendFailed; goto sendFailed;
/* Send parameters */
for (i = 0; i < nParams; i++) for (i = 0; i < nParams; i++)
{ {
if (paramValues && paramValues[i]) if (paramValues && paramValues[i])