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Use Tcl ByteArray objects to avoid unwanted character set translation

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in libpgtcl's lo_read/lo_write commands.  Also, deal correctly with
failure return from lo_read().  ljb and Tom Lane.
This commit is contained in:
Tom Lane
2003-10-31 00:18:55 +00:00
parent e84487f67a
commit ede9b68e03
2 changed files with 37 additions and 25 deletions
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38
doc/src/sgml/libpgtcl.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/libpgtcl.sgml,v 1.38 2003/09/29 18:18:35 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/libpgtcl.sgml,v 1.39 2003/10/31 00:18:55 tgl Exp $
-->
<chapter id="pgtcl">
@ -1217,7 +1217,7 @@ pg_lo_creat <parameter>conn</parameter> <parameter>mode</parameter>
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which to create the large
The handle of a connection to the database in which to create the large
object.
</para>
</listitem>
@ -1284,8 +1284,8 @@ pg_lo_open <parameter>conn</parameter> <parameter>loid</parameter> <parameter>mo
<listitem>
<para>
The handle of a database connection in which the large object to
be opened exists.
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
</varlistentry>
@ -1354,7 +1354,7 @@ pg_lo_close <parameter>conn</parameter> <parameter>descriptor</parameter>
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1417,7 +1417,7 @@ pg_lo_read <parameter>conn</parameter> <parameter>descriptor</parameter> <parame
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1458,7 +1458,9 @@ pg_lo_read <parameter>conn</parameter> <parameter>descriptor</parameter> <parame
<title>Return Value</title>
<para>
None
The number of bytes actually read is returned; this could be less than
the number requested if the end of the large object is reached first.
In event of an error, the return value is negative.
</para>
</refsect1>
</refentry>
@ -1499,7 +1501,7 @@ pg_lo_write <parameter>conn</parameter> <parameter>descriptor</parameter> <param
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1519,7 +1521,8 @@ pg_lo_write <parameter>conn</parameter> <parameter>descriptor</parameter> <param
<term><parameter>buf</parameter></term>
<listitem>
<para>
The string to write to the large object (not a variable name).
The string to write to the large object (not a variable name,
but the value itself).
</para>
</listitem>
</varlistentry>
@ -1528,7 +1531,8 @@ pg_lo_write <parameter>conn</parameter> <parameter>descriptor</parameter> <param
<term><parameter>len</parameter></term>
<listitem>
<para>
The maximum number of bytes to write.
The maximum number of bytes to write. The number written will
be the smaller of this value and the length of the string.
</para>
</listitem>
</varlistentry>
@ -1539,7 +1543,9 @@ pg_lo_write <parameter>conn</parameter> <parameter>descriptor</parameter> <param
<title>Return Value</title>
<para>
None
The number of bytes actually written is returned; this will ordinarily
be the same as the number requested.
In event of an error, the return value is negative.
</para>
</refsect1>
</refentry>
@ -1580,7 +1586,7 @@ pg_lo_lseek <parameter>conn</parameter> <parameter>descriptor</parameter> <param
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1664,7 +1670,7 @@ pg_lo_tell <parameter>conn</parameter> <parameter>descriptor</parameter>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1727,7 +1733,7 @@ pg_lo_unlink <parameter>conn</parameter> <parameter>loid</parameter>
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>
@ -1788,7 +1794,7 @@ pg_lo_import <parameter>conn</parameter> <parameter>filename</parameter>
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which to create the large
The handle of a connection to the database in which to create the large
object.
</para>
</listitem>
@ -1858,7 +1864,7 @@ pg_lo_export <parameter>conn</parameter> <parameter>loid</parameter> <parameter>
<term><parameter>conn</parameter></term>
<listitem>
<para>
The handle of a database connection in which the large object
The handle of a connection to the database in which the large object
exists.
</para>
</listitem>