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Installation instructions for PL/Tcl
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1. Build the pltcl shared library
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The Makefile for the pltcl shared library assumes the sources
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for PostgreSQL are in /usr/local/src/postgresql-6.2.1/src. Edit
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if not.
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The Makefile depends on the tclConfig.sh file that get's installed
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with Tcl. This should either be in /usr/lib or in /usr/local/lib.
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If it is in a different place, edit mkMakefile.tcldefs or make a
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symbolic link to it here.
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Type make and the shared library should get built.
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2. Now create the PL/Tcl language in PostgreSQL
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Since the pg_language system catalog is private to each database,
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the new language can be created only for individual databases,
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or in the template1 database. In the latter case, it is
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automatically available in all newly created databases.
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The commands to create the new language are:
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create function pltcl_call_handler () returns opaque
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as 'path-to-pltcl-shared-lib'
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language 'C';
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create trusted procedural language 'pltcl'
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handler pltcl_call_handler
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lancompiler 'PL/Tcl';
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The trusted keyword on create procedural language tells PostgreSQL,
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that all users (not only those with superuser privilege) are
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permitted to create functions with LANGUAGE 'pltcl'. This is
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absolutely safe, because there is nothing a normal user can do
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with PL/Tcl, to get around access restrictions he/she has.
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3. Use PL/Tcl
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Read pltcl_guide.txt to learn how to write functions and
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trigger procedures in PL/Tcl.
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