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do(7) [centos man page]

DO(7)							  PostgreSQL 9.2.7 Documentation						     DO(7)

NAME
DO - execute an anonymous code block SYNOPSIS
DO [ LANGUAGE lang_name ] code DESCRIPTION
DO executes an anonymous code block, or in other words a transient anonymous function in a procedural language. The code block is treated as though it were the body of a function with no parameters, returning void. It is parsed and executed a single time. The optional LANGUAGE clause can be written either before or after the code block. PARAMETERS
code The procedural language code to be executed. This must be specified as a string literal, just as in CREATE FUNCTION. Use of a dollar-quoted literal is recommended. lang_name The name of the procedural language the code is written in. If omitted, the default is plpgsql. NOTES
The procedural language to be used must already have been installed into the current database by means of CREATE LANGUAGE. plpgsql is installed by default, but other languages are not. The user must have USAGE privilege for the procedural language, or must be a superuser if the language is untrusted. This is the same privilege requirement as for creating a function in the language. EXAMPLES
Grant all privileges on all views in schema public to role webuser: DO $$DECLARE r record; BEGIN FOR r IN SELECT table_schema, table_name FROM information_schema.tables WHERE table_type = 'VIEW' AND table_schema = 'public' LOOP EXECUTE 'GRANT ALL ON ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' TO webuser'; END LOOP; END$$; COMPATIBILITY
There is no DO statement in the SQL standard. SEE ALSO
CREATE LANGUAGE (CREATE_LANGUAGE(7)) PostgreSQL 9.2.7 2014-02-17 DO(7)

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CREATE 
LANGUAGE(7) SQL Commands CREATE LANGUAGE(7) NAME
CREATE LANGUAGE - define a new procedural language SYNOPSIS
CREATE [ PROCEDURAL ] LANGUAGE name CREATE [ TRUSTED ] [ PROCEDURAL ] LANGUAGE name HANDLER call_handler [ VALIDATOR valfunction ] DESCRIPTION
Using CREATE LANGUAGE, a PostgreSQL user can register a new procedural language with a PostgreSQL database. Subsequently, functions and trigger procedures can be defined in this new language. CREATE LANGUAGE effectively associates the language name with a call handler that is responsible for executing functions written in the language. Refer to in the documentation for more information about language call handlers. There are two forms of the CREATE LANGUAGE command. In the first form, the user supplies just the name of the desired language, and the PostgreSQL server consults the pg_pltemplate system catalog to determine the correct parameters. In the second form, the user supplies the language parameters along with the language name. The second form can be used to create a language that is not defined in pg_pltemplate, but this approach is considered obsolescent. When the server finds an entry in the pg_pltemplate catalog for the given language name, it will use the catalog data even if the command includes language parameters. This behavior simplifies loading of old dump files, which are likely to contain out-of-date information about language support functions. Ordinarily, the user must have the PostgreSQL superuser privilege to register a new language. However, the owner of a database can register a new language within that database if the language is listed in the pg_pltemplate catalog and is marked as allowed to be created by data- base owners (tmpldbacreate is true). The default is that trusted languages can be created by database owners, but this can be adjusted by superusers by modifying the contents of pg_pltemplate. The creator of a language becomes its owner and can later drop it, rename it, or assign it to a new owner. PARAMETERS
TRUSTED TRUSTED specifies that the call handler for the language is safe, that is, it does not offer an unprivileged user any functionality to bypass access restrictions. If this key word is omitted when registering the language, only users with the PostgreSQL superuser privilege can use this language to create new functions. PROCEDURAL This is a noise word. name The name of the new procedural language. The language name is case insensitive. The name must be unique among the languages in the database. For backward compatibility, the name can be enclosed by single quotes. HANDLER call_handler call_handler is the name of a previously registered function that will be called to execute the procedural language functions. The call handler for a procedural language must be written in a compiled language such as C with version 1 call convention and regis- tered with PostgreSQL as a function taking no arguments and returning the language_handler type, a placeholder type that is simply used to identify the function as a call handler. VALIDATOR valfunction valfunction is the name of a previously registered function that will be called when a new function in the language is created, to validate the new function. If no validator function is specified, then a new function will not be checked when it is created. The validator function must take one argument of type oid, which will be the OID of the to-be-created function, and will typically return void. A validator function would typically inspect the function body for syntactical correctness, but it can also look at other properties of the function, for example if the language cannot handle certain argument types. To signal an error, the validator function should use the ereport() function. The return value of the function is ignored. The TRUSTED option and the support function name(s) are ignored if the server has an entry for the specified language name in pg_pltem- plate. NOTES
The createlang(1) program is a simple wrapper around the CREATE LANGUAGE command. It eases installation of procedural languages from the shell command line. Use DROP LANGUAGE [drop_language(7)], or better yet the droplang(1) program, to drop procedural languages. The system catalog pg_language (see in the documentation) records information about the currently installed languages. Also, createlang has an option to list the installed languages. To create functions in a procedural language, a user must have the USAGE privilege for the language. By default, USAGE is granted to PUBLIC (i.e., everyone) for trusted languages. This can be revoked if desired. Procedural languages are local to individual databases. However, a language can be installed into the template1 database, which will cause it to be available automatically in all subsequently-created databases. The call handler function and the validator function (if any) must already exist if the server does not have an entry for the language in pg_pltemplate. But when there is an entry, the functions need not already exist; they will be automatically defined if not present in the database. (This might result in CREATE LANGUAGE failing, if the shared library that implements the language is not available in the installation.) In PostgreSQL versions before 7.3, it was necessary to declare handler functions as returning the placeholder type opaque, rather than lan- guage_handler. To support loading of old dump files, CREATE LANGUAGE will accept a function declared as returning opaque, but it will issue a notice and change the function's declared return type to language_handler. EXAMPLES
The preferred way of creating any of the standard procedural languages is just: CREATE LANGUAGE plpgsql; For a language not known in the pg_pltemplate catalog, a sequence such as this is needed: CREATE FUNCTION plsample_call_handler() RETURNS language_handler AS '$libdir/plsample' LANGUAGE C; CREATE LANGUAGE plsample HANDLER plsample_call_handler; COMPATIBILITY
CREATE LANGUAGE is a PostgreSQL extension. SEE ALSO
ALTER LANGUAGE [alter_language(7)], CREATE FUNCTION [create_function(7)], DROP LANGUAGE [drop_language(7)], GRANT [grant(7)], REVOKE [revoke(7)], createlang [createlang(1)], droplang [droplang(1)] SQL - Language Statements 2010-05-14 CREATE LANGUAGE(7)
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