libpgtcl.sgml

关系型数据库 Postgresql 6.5.2

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<REFENTRY ID="PGTCL-PGLOREAD">
<REFMETA>
<REFENTRYTITLE>pg_lo_read</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_read
</REFNAME>
<REFPURPOSE>read a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOREAD-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>reading</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOREAD-2"><PRIMARY>pg_lo_read</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_read <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOREAD-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid buffer variable to contain the large object segment.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the maximum allowable size of the large object segment.</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOREAD-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOREAD-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_read</FUNCTION> reads 
at most <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE> bytes from a large object into a variable
 named <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE>.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOREAD-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE> must be a valid variable name.
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOWRITE">
<REFMETA>
<REFENTRYTITLE>pg_lo_write</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_write
</REFNAME>
<REFPURPOSE>write a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOWRITE-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>writing</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOWRITE-2"><PRIMARY>pg_lo_write</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_write <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOWRITE-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid string variable to write to the large object.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the maximum size of the string to write.</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOWRITE-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOWRITE-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_write</FUNCTION> writes 
at most <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE> bytes to a large object from a variable
 <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE>.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOWRITE-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE> must be 
the actual string to write, not a variable name.
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOLSEEK">
<REFMETA>
<REFENTRYTITLE>pg_lo_lseek</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_lseek
</REFNAME>
<REFPURPOSE>seek to a position in a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOLSEEK-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>positioning</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOLSEEK-2"><PRIMARY>pg_lo_lseek</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_lseek <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOLSEEK-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a zero-based offset in bytes.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA> whence can be "SEEK_CUR", "SEEK_END", or "SEEK_SET" </PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOLSEEK-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOLSEEK-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_lseek</FUNCTION> positions 
to <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> bytes from the beginning of the large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOLSEEK-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE> 
can be "SEEK_CUR", "SEEK_END", or "SEEK_SET".
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOTELL">
<REFMETA>
<REFENTRYTITLE>pg_lo_tell</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_tell
</REFNAME>
<REFPURPOSE>return the current seek position of a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOTELL-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>positioning</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOTELL-2"><PRIMARY>pg_lo_tell</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_tell <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOTELL-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOTELL-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>A zero-based offset in bytes suitable for input to <Function>pg_lo_lseek</Function>.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOTELL-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_tell</FUNCTION> returns the current
to <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> in bytes from the beginning of the large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOTELL-2">
<TITLE>Usage
</TITLE>
<PARA>
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOUNLINK">
<REFMETA>
<REFENTRYTITLE>pg_lo_unlink</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_unlink
</REFNAME>
<REFPURPOSE>delete a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOUNLINK-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>delete</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOUNLINK-2"><PRIMARY>pg_lo_unlink</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_unlink <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOUNLINK-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Identifier for a large object.
XXX Is this the same as objOid in other calls?? - thomas 1998-01-11
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOUNLINK-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOUNLINK-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_unlink</FUNCTION> deletes the specified large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOUNLINK-2">
<TITLE>Usage
</TITLE>
<PARA>
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOIMPORT">
<REFMETA>
<REFENTRYTITLE>pg_lo_import</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_import
</REFNAME>
<REFPURPOSE>import a large object from a Unix file
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOIMPORT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>import</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOIMPORT-2"><PRIMARY>pg_lo_import</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_import <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOIMPORT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Unix file name.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOIMPORT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
XXX Does this return a lobjId? Is that the same as the objOid in other calls? thomas - 1998-01-11
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOIMPORT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_import</FUNCTION> reads the specified file and places the contents into a large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOIMPORT-2">
<TITLE>Usage
</TITLE>
<PARA>
  <Function>pg_lo_import</Function> must be called within a BEGIN/END transaction block.
</PARA>
</REFSECT1>
</REFENTRY>

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<REFENTRY ID="PGTCL-PGLOEXPORT">
<REFMETA>
<REFENTRYTITLE>pg_lo_export</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_export
</REFNAME>
<REFPURPOSE>export a large object to a Unix file
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOEXPORT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>export</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOEXPORT-2"><PRIMARY>pg_lo_export</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_export <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOEXPORT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Large object identifier.
XXX Is this the same as the objOid in other calls?? thomas - 1998-01-11
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Unix file name.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOEXPORT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
XXX Does this return a lobjId? Is that the same as the objOid in other calls? thomas - 1998-01-11
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOEXPORT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_export</FUNCTION> writes the specified large object into a Unix file.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOEXPORT-2">
<TITLE>Usage
</TITLE>
<PARA>
  <Function>pg_lo_export</Function> must be called within a BEGIN/END transaction block.
</PARA>
</REFSECT1>
</REFENTRY>

</Sect1>
</Chapter>