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180 lines
3.8 KiB
Plaintext
180 lines
3.8 KiB
Plaintext
<REFENTRY ID="SQL-LOAD">
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<REFMETA>
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<REFENTRYTITLE>
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LOAD
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</REFENTRYTITLE>
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<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
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</REFMETA>
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<REFNAMEDIV>
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<REFNAME>
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LOAD
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</REFNAME>
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<REFPURPOSE>
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Dynamically loads an object file
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</REFPURPOSE>
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<REFSYNOPSISDIV>
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<REFSYNOPSISDIVINFO>
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<DATE>1998-09-24</DATE>
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</REFSYNOPSISDIVINFO>
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<SYNOPSIS>
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<REPLACEABLE CLASS="PARAMETER">
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</REPLACEABLE>
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LOAD '<REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>'
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</SYNOPSIS>
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<REFSECT2 ID="R2-SQL-LOAD-1">
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<REFSECT2INFO>
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<DATE>1998-09-01</DATE>
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</REFSECT2INFO>
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<TITLE>
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Inputs
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</TITLE>
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<PARA>
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</PARA>
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<VARIABLELIST>
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<VARLISTENTRY>
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<TERM>
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<REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
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</TERM>
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<LISTITEM>
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<PARA>
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Object file for dynamic loading.
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</VARIABLELIST>
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</REFSECT2>
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<REFSECT2 ID="R2-SQL-LOAD-2">
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<REFSECT2INFO>
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<DATE>1998-09-24</DATE>
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</REFSECT2INFO>
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<TITLE>
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Outputs
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</TITLE>
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<PARA>
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<VARIABLELIST>
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<VARLISTENTRY>
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<TERM>
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<replaceable>status</replaceable>
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</TERM>
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<LISTITEM>
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<PARA>
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<VARIABLELIST>
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<VARLISTENTRY>
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<TERM>
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<returnvalue>LOAD</returnvalue>
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</TERM>
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<LISTITEM>
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<PARA>
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Message returned on successful completion.
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<VARLISTENTRY>
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<TERM>
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<returnvalue>ERROR: LOAD: could not open file '<REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>'</returnvalue>
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</TERM>
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<LISTITEM>
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<PARA>
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Message returned if the specified file is not found. The file must be visible
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<emphasis>to the <productname>Postgres</productname> backend</emphasis>,
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with the appropriate full path name specified, to avoid this message.
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</VARIABLELIST>
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</VARIABLELIST>
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</REFSECT2>
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</REFSYNOPSISDIV>
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<REFSECT1 ID="R1-SQL-LOAD-1">
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<REFSECT1INFO>
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<DATE>1998-09-24</DATE>
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</REFSECT1INFO>
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<TITLE>
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Description
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</TITLE>
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<PARA>
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Loads an object (or ".o") file into the
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<productname>Postgres</productname> backend address space. Once a
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file is loaded, all functions in that file can be accessed. This
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function is used in support of user-defined types and functions.
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<para>
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If a file is not loaded using
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<command>LOAD</command>,
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the file will be loaded automatically the first time the
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function is called by <productname>Postgres</productname>.
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<command>LOAD</command>
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can also be used to reload an object file if it has been edited and
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recompiled. Only objects created from C language files are supported
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at this time.
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<REFSECT2 ID="R2-SQL-LOAD-3">
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<REFSECT2INFO>
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<DATE>1998-09-24</DATE>
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</REFSECT2INFO>
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<TITLE>
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Notes
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</TITLE>
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<PARA>
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Functions in loaded object files should not call functions in other
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object files loaded through the
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<command>LOAD</command>
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command. For example, all functions in file <literal>A</literal> should
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call each other, functions in the standard or math libraries, or in
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Postgres itself. They should not call functions defined in a different
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loaded file <literal>B</literal>.
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This is because if <literal>B</literal> is reloaded, the Postgres loader is
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not able to relocate the calls from the functions in <literal>A</literal> into
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the new address space of <literal>B</literal>.
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If <literal>B</literal> is not reloaded, however, there will
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not be a problem.
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<para>
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Object files must be compiled to contain position independent code.
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For example,
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on DECstations you must use
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<application>/bin/cc</application>
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with the <literal>-G 0</literal> option when compiling object files to be
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loaded.
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<para>
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Note that if you are porting <productname>Postgres</productname>
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to a new platform, <command>LOAD</command>
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will have to work in order to support ADTs.
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</REFSECT2>
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<REFSECT1 ID="R1-SQL-LOAD-2">
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<TITLE>
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Usage
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</TITLE>
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<PARA>
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<ProgramListing>
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--Load the file /usr/postgres/demo/circle.o
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--
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LOAD "/usr/postgres/demo/circle.o"
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</ProgramListing>
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</REFSECT1>
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<REFSECT1 ID="R1-SQL-LOAD-3">
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<TITLE>
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Compatibility
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</TITLE>
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<PARA>
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</PARA>
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<REFSECT2 ID="R2-SQL-LOAD-4">
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<REFSECT2INFO>
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<DATE>1998-09-24</DATE>
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</REFSECT2INFO>
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<TITLE>
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SQL92
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</TITLE>
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<PARA>
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There is no <command>LOAD</command> in <acronym>SQL92</acronym>.
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</REFENTRY>
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