1CREATE PROCEDURE(7)      PostgreSQL 12.2 Documentation     CREATE PROCEDURE(7)
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NAME

6       CREATE_PROCEDURE - define a new procedure
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SYNOPSIS

9       CREATE [ OR REPLACE ] PROCEDURE
10           name ( [ [ argmode ] [ argname ] argtype [ { DEFAULT | = } default_expr ] [, ...] ] )
11         { LANGUAGE lang_name
12           | TRANSFORM { FOR TYPE type_name } [, ... ]
13           | [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER
14           | SET configuration_parameter { TO value | = value | FROM CURRENT }
15           | AS 'definition'
16           | AS 'obj_file', 'link_symbol'
17         } ...
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DESCRIPTION

20       CREATE PROCEDURE defines a new procedure.  CREATE OR REPLACE PROCEDURE
21       will either create a new procedure, or replace an existing definition.
22       To be able to define a procedure, the user must have the USAGE
23       privilege on the language.
24
25       If a schema name is included, then the procedure is created in the
26       specified schema. Otherwise it is created in the current schema. The
27       name of the new procedure must not match any existing procedure or
28       function with the same input argument types in the same schema.
29       However, procedures and functions of different argument types can share
30       a name (this is called overloading).
31
32       To replace the current definition of an existing procedure, use CREATE
33       OR REPLACE PROCEDURE. It is not possible to change the name or argument
34       types of a procedure this way (if you tried, you would actually be
35       creating a new, distinct procedure).
36
37       When CREATE OR REPLACE PROCEDURE is used to replace an existing
38       procedure, the ownership and permissions of the procedure do not
39       change. All other procedure properties are assigned the values
40       specified or implied in the command. You must own the procedure to
41       replace it (this includes being a member of the owning role).
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43       The user that creates the procedure becomes the owner of the procedure.
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45       To be able to create a procedure, you must have USAGE privilege on the
46       argument types.
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PARAMETERS

49       name
50           The name (optionally schema-qualified) of the procedure to create.
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52       argmode
53           The mode of an argument: IN, INOUT, or VARIADIC. If omitted, the
54           default is IN. (OUT arguments are currently not supported for
55           procedures. Use INOUT instead.)
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57       argname
58           The name of an argument.
59
60       argtype
61           The data type(s) of the procedure's arguments (optionally
62           schema-qualified), if any. The argument types can be base,
63           composite, or domain types, or can reference the type of a table
64           column.
65
66           Depending on the implementation language it might also be allowed
67           to specify “pseudo-types” such as cstring. Pseudo-types indicate
68           that the actual argument type is either incompletely specified, or
69           outside the set of ordinary SQL data types.
70
71           The type of a column is referenced by writing
72           table_name.column_name%TYPE. Using this feature can sometimes help
73           make a procedure independent of changes to the definition of a
74           table.
75
76       default_expr
77           An expression to be used as default value if the parameter is not
78           specified. The expression has to be coercible to the argument type
79           of the parameter. All input parameters following a parameter with a
80           default value must have default values as well.
81
82       lang_name
83           The name of the language that the procedure is implemented in. It
84           can be sql, c, internal, or the name of a user-defined procedural
85           language, e.g.  plpgsql. Enclosing the name in single quotes is
86           deprecated and requires matching case.
87
88       TRANSFORM { FOR TYPE type_name } [, ... ] }
89           Lists which transforms a call to the procedure should apply.
90           Transforms convert between SQL types and language-specific data
91           types; see CREATE TRANSFORM (CREATE_TRANSFORM(7)). Procedural
92           language implementations usually have hardcoded knowledge of the
93           built-in types, so those don't need to be listed here. If a
94           procedural language implementation does not know how to handle a
95           type and no transform is supplied, it will fall back to a default
96           behavior for converting data types, but this depends on the
97           implementation.
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99       [EXTERNAL] SECURITY INVOKER
100       [EXTERNAL] SECURITY DEFINER
101           SECURITY INVOKER indicates that the procedure is to be executed
102           with the privileges of the user that calls it. That is the default.
103           SECURITY DEFINER specifies that the procedure is to be executed
104           with the privileges of the user that owns it.
105
106           The key word EXTERNAL is allowed for SQL conformance, but it is
107           optional since, unlike in SQL, this feature applies to all
108           procedures not only external ones.
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110           A SECURITY DEFINER procedure cannot execute transaction control
111           statements (for example, COMMIT and ROLLBACK, depending on the
112           language).
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114       configuration_parameter
115       value
116           The SET clause causes the specified configuration parameter to be
117           set to the specified value when the procedure is entered, and then
118           restored to its prior value when the procedure exits.  SET FROM
119           CURRENT saves the value of the parameter that is current when
120           CREATE PROCEDURE is executed as the value to be applied when the
121           procedure is entered.
122
123           If a SET clause is attached to a procedure, then the effects of a
124           SET LOCAL command executed inside the procedure for the same
125           variable are restricted to the procedure: the configuration
126           parameter's prior value is still restored at procedure exit.
127           However, an ordinary SET command (without LOCAL) overrides the SET
128           clause, much as it would do for a previous SET LOCAL command: the
129           effects of such a command will persist after procedure exit, unless
130           the current transaction is rolled back.
131
132           If a SET clause is attached to a procedure, then that procedure
133           cannot execute transaction control statements (for example, COMMIT
134           and ROLLBACK, depending on the language).
135
136           See SET(7) and Chapter 19 for more information about allowed
137           parameter names and values.
138
139       definition
140           A string constant defining the procedure; the meaning depends on
141           the language. It can be an internal procedure name, the path to an
142           object file, an SQL command, or text in a procedural language.
143
144           It is often helpful to use dollar quoting (see Section 4.1.2.4) to
145           write the procedure definition string, rather than the normal
146           single quote syntax. Without dollar quoting, any single quotes or
147           backslashes in the procedure definition must be escaped by doubling
148           them.
149
150       obj_file, link_symbol
151           This form of the AS clause is used for dynamically loadable C
152           language procedures when the procedure name in the C language
153           source code is not the same as the name of the SQL procedure. The
154           string obj_file is the name of the shared library file containing
155           the compiled C procedure, and is interpreted as for the LOAD(7)
156           command. The string link_symbol is the procedure's link symbol,
157           that is, the name of the procedure in the C language source code.
158           If the link symbol is omitted, it is assumed to be the same as the
159           name of the SQL procedure being defined.
160
161           When repeated CREATE PROCEDURE calls refer to the same object file,
162           the file is only loaded once per session. To unload and reload the
163           file (perhaps during development), start a new session.
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NOTES

166       See CREATE FUNCTION (CREATE_FUNCTION(7)) for more details on function
167       creation that also apply to procedures.
168
169       Use CALL(7) to execute a procedure.
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EXAMPLES

172           CREATE PROCEDURE insert_data(a integer, b integer)
173           LANGUAGE SQL
174           AS $$
175           INSERT INTO tbl VALUES (a);
176           INSERT INTO tbl VALUES (b);
177           $$;
178
179           CALL insert_data(1, 2);
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COMPATIBILITY

182       A CREATE PROCEDURE command is defined in the SQL standard. The
183       PostgreSQL version is similar but not fully compatible. For details see
184       also CREATE FUNCTION (CREATE_FUNCTION(7)).
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SEE ALSO

187       ALTER PROCEDURE (ALTER_PROCEDURE(7)), DROP PROCEDURE
188       (DROP_PROCEDURE(7)), CALL(7), CREATE FUNCTION (CREATE_FUNCTION(7))
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192PostgreSQL 12.2                      2020                  CREATE PROCEDURE(7)
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