Baoding-FenShuaJiang
/
Green_GoodERP18_FSJ_Standard
关注 1
点赞 0
百科 捐赠
gooderp18绿色标准版
您最多选择25个主题 主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
分支: master
分支列表 标签列表
${ item.name }
创建分支 ${ searchTerm }
从 'master'
${ noResults }
Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/sql-alterfunction.html

168 行
16KB
原始文件 永久链接 Blame 文件历史 

  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>ALTER FUNCTION</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="sql-alterforeigntable.html" title="ALTER FOREIGN TABLE" /><link rel="next" href="sql-altergroup.html" title="ALTER GROUP" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">ALTER FUNCTION</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-alterforeigntable.html" title="ALTER FOREIGN TABLE">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-altergroup.html" title="ALTER GROUP">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-ALTERFUNCTION"><div class="titlepage"></div><a id="id-1.9.3.14.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">ALTER FUNCTION</span></h2><p>ALTER FUNCTION — change the definition of a function</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">

  3. ALTER FUNCTION <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ]

  4.     <em class="replaceable"><code>action</code></em> [ ... ] [ RESTRICT ]

  5. ALTER FUNCTION <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ]

  6.     RENAME TO <em class="replaceable"><code>new_name</code></em>

  7. ALTER FUNCTION <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ]

  8.     OWNER TO { <em class="replaceable"><code>new_owner</code></em> | CURRENT_USER | SESSION_USER }

  9. ALTER FUNCTION <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ]

  10.     SET SCHEMA <em class="replaceable"><code>new_schema</code></em>

  11. ALTER FUNCTION <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ]

  12.     DEPENDS ON EXTENSION <em class="replaceable"><code>extension_name</code></em>

  13. 

  14. <span class="phrase">where <em class="replaceable"><code>action</code></em> is one of:</span>

  15. 

  16.     CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT

  17.     IMMUTABLE | STABLE | VOLATILE | [ NOT ] LEAKPROOF

  18.     [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER

  19.     PARALLEL { UNSAFE | RESTRICTED | SAFE }

  20.     COST <em class="replaceable"><code>execution_cost</code></em>

  21.     ROWS <em class="replaceable"><code>result_rows</code></em>

  22.     SUPPORT <em class="replaceable"><code>support_function</code></em>

  23.     SET <em class="replaceable"><code>configuration_parameter</code></em> { TO | = } { <em class="replaceable"><code>value</code></em> | DEFAULT }

  24.     SET <em class="replaceable"><code>configuration_parameter</code></em> FROM CURRENT

  25.     RESET <em class="replaceable"><code>configuration_parameter</code></em>

  26.     RESET ALL

  27. </pre></div><div class="refsect1" id="id-1.9.3.14.5"><h2>Description</h2><p>

  28.    <code class="command">ALTER FUNCTION</code> changes the definition of a

  29.    function.

  30.   </p><p>

  31.    You must own the function to use <code class="command">ALTER FUNCTION</code>.

  32.    To change a function's schema, you must also have <code class="literal">CREATE</code>

  33.    privilege on the new schema.

  34.    To alter the owner, you must also be a direct or indirect member of the new

  35.    owning role, and that role must have <code class="literal">CREATE</code> privilege on

  36.    the function's schema.  (These restrictions enforce that altering the owner

  37.    doesn't do anything you couldn't do by dropping and recreating the function.

  38.    However, a superuser can alter ownership of any function anyway.)

  39.   </p></div><div class="refsect1" id="id-1.9.3.14.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>

  40.       The name (optionally schema-qualified) of an existing function.  If no

  41.       argument list is specified, the name must be unique in its schema.

  42.      </p></dd><dt><span class="term"><em class="replaceable"><code>argmode</code></em></span></dt><dd><p>

  43.       The mode of an argument: <code class="literal">IN</code>, <code class="literal">OUT</code>,

  44.       <code class="literal">INOUT</code>, or <code class="literal">VARIADIC</code>.

  45.       If omitted, the default is <code class="literal">IN</code>.

  46.       Note that <code class="command">ALTER FUNCTION</code> does not actually pay

  47.       any attention to <code class="literal">OUT</code> arguments, since only the input

  48.       arguments are needed to determine the function's identity.

  49.       So it is sufficient to list the <code class="literal">IN</code>, <code class="literal">INOUT</code>,

  50.       and <code class="literal">VARIADIC</code> arguments.

  51.      </p></dd><dt><span class="term"><em class="replaceable"><code>argname</code></em></span></dt><dd><p>

  52.       The name of an argument.

  53.       Note that <code class="command">ALTER FUNCTION</code> does not actually pay

  54.       any attention to argument names, since only the argument data

  55.       types are needed to determine the function's identity.

  56.      </p></dd><dt><span class="term"><em class="replaceable"><code>argtype</code></em></span></dt><dd><p>

  57.       The data type(s) of the function's arguments (optionally

  58.       schema-qualified), if any.

  59.      </p></dd><dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt><dd><p>

  60.       The new name of the function.

  61.      </p></dd><dt><span class="term"><em class="replaceable"><code>new_owner</code></em></span></dt><dd><p>

  62.       The new owner of the function.  Note that if the function is

  63.       marked <code class="literal">SECURITY DEFINER</code>, it will subsequently

  64.       execute as the new owner.

  65.      </p></dd><dt><span class="term"><em class="replaceable"><code>new_schema</code></em></span></dt><dd><p>

  66.       The new schema for the function.

  67.      </p></dd><dt><span class="term"><em class="replaceable"><code>extension_name</code></em></span></dt><dd><p>

  68.       The name of the extension that the function is to depend on.

  69.      </p></dd><dt><span class="term"><code class="literal">CALLED ON NULL INPUT</code><br /></span><span class="term"><code class="literal">RETURNS NULL ON NULL INPUT</code><br /></span><span class="term"><code class="literal">STRICT</code></span></dt><dd><p><code class="literal">CALLED ON NULL INPUT</code> changes the function so

  70.        that it will be invoked when some or all of its arguments are

  71.        null. <code class="literal">RETURNS NULL ON NULL INPUT</code> or

  72.        <code class="literal">STRICT</code> changes the function so that it is not

  73.        invoked if any of its arguments are null; instead, a null result

  74.        is assumed automatically.  See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a>

  75.        for more information.

  76.       </p></dd><dt><span class="term"><code class="literal">IMMUTABLE</code><br /></span><span class="term"><code class="literal">STABLE</code><br /></span><span class="term"><code class="literal">VOLATILE</code></span></dt><dd><p>

  77.        Change the volatility of the function to the specified setting.

  78.        See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for details.

  79.       </p></dd><dt><span class="term"><code class="literal">[<span class="optional"> EXTERNAL </span>] SECURITY INVOKER</code><br /></span><span class="term"><code class="literal">[<span class="optional"> EXTERNAL </span>] SECURITY DEFINER</code></span></dt><dd><p>

  80.       Change whether the function is a security definer or not. The

  81.       key word <code class="literal">EXTERNAL</code> is ignored for SQL

  82.       conformance. See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for more information about

  83.       this capability.

  84.      </p></dd><dt><span class="term"><code class="literal">PARALLEL</code></span></dt><dd><p>

  85.       Change whether the function is deemed safe for parallelism.

  86.       See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for details.

  87.      </p></dd><dt><span class="term"><code class="literal">LEAKPROOF</code></span></dt><dd><p>

  88.       Change whether the function is considered leakproof or not.

  89.       See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for more information about

  90.       this capability.

  91.      </p></dd><dt><span class="term"><code class="literal">COST</code> <em class="replaceable"><code>execution_cost</code></em></span></dt><dd><p>

  92.        Change the estimated execution cost of the function.

  93.        See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for more information.

  94.       </p></dd><dt><span class="term"><code class="literal">ROWS</code> <em class="replaceable"><code>result_rows</code></em></span></dt><dd><p>

  95.        Change the estimated number of rows returned by a set-returning

  96.        function.  See <a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a> for more information.

  97.       </p></dd><dt><span class="term"><code class="literal">SUPPORT</code> <em class="replaceable"><code>support_function</code></em></span></dt><dd><p>

  98.       Set or change the planner support function to use for this function.

  99.       See <a class="xref" href="xfunc-optimization.html" title="37.11. Function Optimization Information">Section 37.11</a> for details.  You must be

  100.       superuser to use this option.

  101.      </p><p>

  102.       This option cannot be used to remove the support function altogether,

  103.       since it must name a new support function.  Use <code class="command">CREATE OR

  104.       REPLACE FUNCTION</code> if you need to do that.

  105.      </p></dd><dt><span class="term"><em class="replaceable"><code>configuration_parameter</code></em><br /></span><span class="term"><em class="replaceable"><code>value</code></em></span></dt><dd><p>

  106.         Add or change the assignment to be made to a configuration parameter

  107.         when the function is called.  If

  108.         <em class="replaceable"><code>value</code></em> is <code class="literal">DEFAULT</code>

  109.         or, equivalently, <code class="literal">RESET</code> is used, the function-local

  110.         setting is removed, so that the function executes with the value

  111.         present in its environment.  Use <code class="literal">RESET

  112.         ALL</code> to clear all function-local settings.

  113.         <code class="literal">SET FROM CURRENT</code> saves the value of the parameter that

  114.         is current when <code class="command">ALTER FUNCTION</code> is executed as the value

  115.         to be applied when the function is entered.

  116.        </p><p>

  117.         See <a class="xref" href="sql-set.html" title="SET"><span class="refentrytitle">SET</span></a> and

  118.         <a class="xref" href="runtime-config.html" title="Chapter 19. Server Configuration">Chapter 19</a>

  119.         for more information about allowed parameter names and values.

  120.        </p></dd><dt><span class="term"><code class="literal">RESTRICT</code></span></dt><dd><p>

  121.       Ignored for conformance with the SQL standard.

  122.      </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.14.7"><h2>Examples</h2><p>

  123.    To rename the function <code class="literal">sqrt</code> for type

  124.    <code class="type">integer</code> to <code class="literal">square_root</code>:

  125. </p><pre class="programlisting">

  126. ALTER FUNCTION sqrt(integer) RENAME TO square_root;

  127. </pre><p>

  128.   </p><p>

  129.    To change the owner of the function <code class="literal">sqrt</code> for type

  130.    <code class="type">integer</code> to <code class="literal">joe</code>:

  131. </p><pre class="programlisting">

  132. ALTER FUNCTION sqrt(integer) OWNER TO joe;

  133. </pre><p>

  134.   </p><p>

  135.    To change the schema of the function <code class="literal">sqrt</code> for type

  136.    <code class="type">integer</code> to <code class="literal">maths</code>:

  137. </p><pre class="programlisting">

  138. ALTER FUNCTION sqrt(integer) SET SCHEMA maths;

  139. </pre><p>

  140.   </p><p>

  141.    To mark the function <code class="literal">sqrt</code> for type

  142.    <code class="type">integer</code> as being dependent on the extension

  143.    <code class="literal">mathlib</code>:

  144. </p><pre class="programlisting">

  145. ALTER FUNCTION sqrt(integer) DEPENDS ON EXTENSION mathlib;

  146. </pre><p>

  147.   </p><p>

  148.    To adjust the search path that is automatically set for a function:

  149. </p><pre class="programlisting">

  150. ALTER FUNCTION check_password(text) SET search_path = admin, pg_temp;

  151. </pre><p>

  152.   </p><p>

  153.    To disable automatic setting of <code class="varname">search_path</code> for a function:

  154. </p><pre class="programlisting">

  155. ALTER FUNCTION check_password(text) RESET search_path;

  156. </pre><p>

  157.    The function will now execute with whatever search path is used by its

  158.    caller.

  159.   </p></div><div class="refsect1" id="id-1.9.3.14.8"><h2>Compatibility</h2><p>

  160.    This statement is partially compatible with the <code class="command">ALTER

  161.    FUNCTION</code> statement in the SQL standard. The standard allows more

  162.    properties of a function to be modified, but does not provide the

  163.    ability to rename a function, make a function a security definer,

  164.    attach configuration parameter values to a function,

  165.    or change the owner, schema, or volatility of a function. The standard also

  166.    requires the <code class="literal">RESTRICT</code> key word, which is optional in

  167.    <span class="productname">PostgreSQL</span>.

  168.   </p></div><div class="refsect1" id="id-1.9.3.14.9"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createfunction.html" title="CREATE FUNCTION"><span class="refentrytitle">CREATE FUNCTION</span></a>, <a class="xref" href="sql-dropfunction.html" title="DROP FUNCTION"><span class="refentrytitle">DROP FUNCTION</span></a>, <a class="xref" href="sql-alterprocedure.html" title="ALTER PROCEDURE"><span class="refentrytitle">ALTER PROCEDURE</span></a>, <a class="xref" href="sql-alterroutine.html" title="ALTER ROUTINE"><span class="refentrytitle">ALTER ROUTINE</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-alterforeigntable.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-altergroup.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ALTER FOREIGN TABLE </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ALTER GROUP</td></tr></table></div></body></html>
上海开阖软件有限公司 沪ICP备12045867号-1