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><DIV
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><H1
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>V. Server Programming</H1
><DIV
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><A
NAME="AEN52128"
></A
><P
>    This part is about extending the server functionality with
    user-defined functions, data types, triggers, etc.  These are
    advanced topics which should probably be approached only after all
    the other user documentation about <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> has
    been understood.  Later chapters in this part describe the server-side
    programming languages available in the
    <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> distribution as well as
    general issues concerning server-side programming languages.  It
    is essential to read at least the earlier sections of <A
HREF="extend.html"
>Chapter 35</A
> (covering functions) before diving into the
    material about server-side programming languages.
   </P
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>35. <A
HREF="extend.html"
>Extending <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
></A
></DT
><DD
><DL
><DT
>35.1. <A
HREF="extend-how.html"
>How Extensibility Works</A
></DT
><DT
>35.2. <A
HREF="extend-type-system.html"
>The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> Type System</A
></DT
><DT
>35.3. <A
HREF="xfunc.html"
>User-defined Functions</A
></DT
><DT
>35.4. <A
HREF="xfunc-sql.html"
>Query Language (<ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
>) Functions</A
></DT
><DT
>35.5. <A
HREF="xfunc-overload.html"
>Function Overloading</A
></DT
><DT
>35.6. <A
HREF="xfunc-volatility.html"
>Function Volatility Categories</A
></DT
><DT
>35.7. <A
HREF="xfunc-pl.html"
>Procedural Language Functions</A
></DT
><DT
>35.8. <A
HREF="xfunc-internal.html"
>Internal Functions</A
></DT
><DT
>35.9. <A
HREF="xfunc-c.html"
>C-Language Functions</A
></DT
><DT
>35.10. <A
HREF="xaggr.html"
>User-defined Aggregates</A
></DT
><DT
>35.11. <A
HREF="xtypes.html"
>User-defined Types</A
></DT
><DT
>35.12. <A
HREF="xoper.html"
>User-defined Operators</A
></DT
><DT
>35.13. <A
HREF="xoper-optimization.html"
>Operator Optimization Information</A
></DT
><DT
>35.14. <A
HREF="xindex.html"
>Interfacing Extensions To Indexes</A
></DT
><DT
>35.15. <A
HREF="extend-extensions.html"
>Packaging Related Objects into an Extension</A
></DT
><DT
>35.16. <A
HREF="extend-pgxs.html"
>Extension Building Infrastructure</A
></DT
></DL
></DD
><DT
>36. <A
HREF="triggers.html"
>Triggers</A
></DT
><DD
><DL
><DT
>36.1. <A
HREF="trigger-definition.html"
>Overview of Trigger Behavior</A
></DT
><DT
>36.2. <A
HREF="trigger-datachanges.html"
>Visibility of Data Changes</A
></DT
><DT
>36.3. <A
HREF="trigger-interface.html"
>Writing Trigger Functions in C</A
></DT
><DT
>36.4. <A
HREF="trigger-example.html"
>A Complete Trigger Example</A
></DT
></DL
></DD
><DT
>37. <A
HREF="rules.html"
>The Rule System</A
></DT
><DD
><DL
><DT
>37.1. <A
HREF="querytree.html"
>The Query Tree</A
></DT
><DT
>37.2. <A
HREF="rules-views.html"
>Views and the Rule System</A
></DT
><DT
>37.3. <A
HREF="rules-update.html"
>Rules on <TT
CLASS="COMMAND"
>INSERT</TT
>, <TT
CLASS="COMMAND"
>UPDATE</TT
>, and <TT
CLASS="COMMAND"
>DELETE</TT
></A
></DT
><DT
>37.4. <A
HREF="rules-privileges.html"
>Rules and Privileges</A
></DT
><DT
>37.5. <A
HREF="rules-status.html"
>Rules and Command Status</A
></DT
><DT
>37.6. <A
HREF="rules-triggers.html"
>Rules Versus Triggers</A
></DT
></DL
></DD
><DT
>38. <A
HREF="xplang.html"
>Procedural Languages</A
></DT
><DD
><DL
><DT
>38.1. <A
HREF="xplang-install.html"
>Installing Procedural Languages</A
></DT
></DL
></DD
><DT
>39. <A
HREF="plpgsql.html"
><SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> - <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
> Procedural Language</A
></DT
><DD
><DL
><DT
>39.1. <A
HREF="plpgsql-overview.html"
>Overview</A
></DT
><DT
>39.2. <A
HREF="plpgsql-structure.html"
>Structure of <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
></A
></DT
><DT
>39.3. <A
HREF="plpgsql-declarations.html"
>Declarations</A
></DT
><DT
>39.4. <A
HREF="plpgsql-expressions.html"
>Expressions</A
></DT
><DT
>39.5. <A
HREF="plpgsql-statements.html"
>Basic Statements</A
></DT
><DT
>39.6. <A
HREF="plpgsql-control-structures.html"
>Control Structures</A
></DT
><DT
>39.7. <A
HREF="plpgsql-cursors.html"
>Cursors</A
></DT
><DT
>39.8. <A
HREF="plpgsql-errors-and-messages.html"
>Errors and Messages</A
></DT
><DT
>39.9. <A
HREF="plpgsql-trigger.html"
>Trigger Procedures</A
></DT
><DT
>39.10. <A
HREF="plpgsql-implementation.html"
><SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
> Under the Hood</A
></DT
><DT
>39.11. <A
HREF="plpgsql-development-tips.html"
>Tips for Developing in <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
></A
></DT
><DT
>39.12. <A
HREF="plpgsql-porting.html"
>Porting from <SPAN
CLASS="PRODUCTNAME"
>Oracle</SPAN
> PL/SQL</A
></DT
></DL
></DD
><DT
>40. <A
HREF="pltcl.html"
>PL/Tcl - Tcl Procedural Language</A
></DT
><DD
><DL
><DT
>40.1. <A
HREF="pltcl-overview.html"
>Overview</A
></DT
><DT
>40.2. <A
HREF="pltcl-functions.html"
>PL/Tcl Functions and Arguments</A
></DT
><DT
>40.3. <A
HREF="pltcl-data.html"
>Data Values in PL/Tcl</A
></DT
><DT
>40.4. <A
HREF="pltcl-global.html"
>Global Data in PL/Tcl</A
></DT
><DT
>40.5. <A
HREF="pltcl-dbaccess.html"
>Database Access from PL/Tcl</A
></DT
><DT
>40.6. <A
HREF="pltcl-trigger.html"
>Trigger Procedures in PL/Tcl</A
></DT
><DT
>40.7. <A
HREF="pltcl-unknown.html"
>Modules and the <CODE
CLASS="FUNCTION"
>unknown</CODE
> Command</A
></DT
><DT
>40.8. <A
HREF="pltcl-procnames.html"
>Tcl Procedure Names</A
></DT
></DL
></DD
><DT
>41. <A
HREF="plperl.html"
>PL/Perl - Perl Procedural Language</A
></DT
><DD
><DL
><DT
>41.1. <A
HREF="plperl-funcs.html"
>PL/Perl Functions and Arguments</A
></DT
><DT
>41.2. <A
HREF="plperl-data.html"
>Data Values in PL/Perl</A
></DT
><DT
>41.3. <A
HREF="plperl-builtins.html"
>Built-in Functions</A
></DT
><DT
>41.4. <A
HREF="plperl-global.html"
>Global Values in PL/Perl</A
></DT
><DT
>41.5. <A
HREF="plperl-trusted.html"
>Trusted and Untrusted PL/Perl</A
></DT
><DT
>41.6. <A
HREF="plperl-triggers.html"
>PL/Perl Triggers</A
></DT
><DT
>41.7. <A
HREF="plperl-under-the-hood.html"
>PL/Perl Under the Hood</A
></DT
></DL
></DD
><DT
>42. <A
HREF="plpython.html"
>PL/Python - Python Procedural Language</A
></DT
><DD
><DL
><DT
>42.1. <A
HREF="plpython-python23.html"
>Python 2 vs. Python 3</A
></DT
><DT
>42.2. <A
HREF="plpython-funcs.html"
>PL/Python Functions</A
></DT
><DT
>42.3. <A
HREF="plpython-data.html"
>Data Values</A
></DT
><DT
>42.4. <A
HREF="plpython-sharing.html"
>Sharing Data</A
></DT
><DT
>42.5. <A
HREF="plpython-do.html"
>Anonymous Code Blocks</A
></DT
><DT
>42.6. <A
HREF="plpython-trigger.html"
>Trigger Functions</A
></DT
><DT
>42.7. <A
HREF="plpython-database.html"
>Database Access</A
></DT
><DT
>42.8. <A
HREF="plpython-subtransaction.html"
>Explicit Subtransactions</A
></DT
><DT
>42.9. <A
HREF="plpython-util.html"
>Utility Functions</A
></DT
><DT
>42.10. <A
HREF="plpython-envar.html"
>Environment Variables</A
></DT
></DL
></DD
><DT
>43. <A
HREF="spi.html"
>Server Programming Interface</A
></DT
><DD
><DL
><DT
>43.1. <A
HREF="spi-interface.html"
>Interface Functions</A
></DT
><DT
>43.2. <A
HREF="spi-interface-support.html"
>Interface Support Functions</A
></DT
><DT
>43.3. <A
HREF="spi-memory.html"
>Memory Management</A
></DT
><DT
>43.4. <A
HREF="spi-visibility.html"
>Visibility of Data Changes</A
></DT
><DT
>43.5. <A
HREF="spi-examples.html"
>Examples</A
></DT
></DL
></DD
></DL
></DIV
></DIV
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