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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:19:15 +0000 |
| commit | 6eb9c5a5657d1fe77b55cc261450f3538d35a94d (patch) | |
| tree | 657d8194422a5daccecfd42d654b8a245ef7b4c8 /doc/src/sgml/html/protocol-message-formats.html | |
| parent | Initial commit. (diff) | |
| download | postgresql-13-upstream.tar.xz postgresql-13-upstream.zip | |
Adding upstream version 13.4.upstream/13.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'doc/src/sgml/html/protocol-message-formats.html')
| -rw-r--r-- | doc/src/sgml/html/protocol-message-formats.html | 1380 |
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diff --git a/doc/src/sgml/html/protocol-message-formats.html b/doc/src/sgml/html/protocol-message-formats.html new file mode 100644 index 0000000..3f9d46f --- /dev/null +++ b/doc/src/sgml/html/protocol-message-formats.html @@ -0,0 +1,1380 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!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>52.7. Message Formats</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="protocol-message-types.html" title="52.6. Message Data Types" /><link rel="next" href="protocol-error-fields.html" title="52.8. Error and Notice Message Fields" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">52.7. Message Formats</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="protocol-message-types.html" title="52.6. Message Data Types">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="protocol.html" title="Chapter 52. Frontend/Backend Protocol">Up</a></td><th width="60%" align="center">Chapter 52. Frontend/Backend Protocol</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="protocol-error-fields.html" title="52.8. Error and Notice Message Fields">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="PROTOCOL-MESSAGE-FORMATS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">52.7. Message Formats</h2></div></div></div><p> +This section describes the detailed format of each message. Each is marked to +indicate that it can be sent by a frontend (F), a backend (B), or both +(F & B). +Notice that although each message includes a byte count at the beginning, +the message format is defined so that the message end can be found without +reference to the byte count. This aids validity checking. (The CopyData +message is an exception, because it forms part of a data stream; the contents +of any individual CopyData message cannot be interpretable on their own.) +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> +AuthenticationOk (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(0) +</span></dt><dd><p> + Specifies that the authentication was successful. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationKerberosV5 (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(2) +</span></dt><dd><p> + Specifies that Kerberos V5 authentication is required. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +AuthenticationCleartextPassword (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(3) +</span></dt><dd><p> + Specifies that a clear-text password is required. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +AuthenticationMD5Password (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(12) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(5) +</span></dt><dd><p> + Specifies that an MD5-encrypted password is required. +</p></dd><dt><span class="term"> + Byte4 +</span></dt><dd><p> + The salt to use when encrypting the password. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationSCMCredential (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(6) +</span></dt><dd><p> + Specifies that an SCM credentials message is required. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationGSS (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(7) +</span></dt><dd><p> + Specifies that GSSAPI authentication is required. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationSSPI (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(9) +</span></dt><dd><p> + Specifies that SSPI authentication is required. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationGSSContinue (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Specifies that this message contains GSSAPI or SSPI data. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + GSSAPI or SSPI authentication data. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationSASL (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(10) +</span></dt><dd><p> + Specifies that SASL authentication is required. +</p></dd></dl></div><p> +The message body is a list of SASL authentication mechanisms, in the +server's order of preference. A zero byte is required as terminator after +the last authentication mechanism name. For each mechanism, there is the +following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + String +</span></dt><dd><p> + Name of a SASL authentication mechanism. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationSASLContinue (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(11) +</span></dt><dd><p> + Specifies that this message contains a SASL challenge. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + SASL data, specific to the SASL mechanism being used. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +AuthenticationSASLFinal (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('R') +</span></dt><dd><p> + Identifies the message as an authentication request. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(12) +</span></dt><dd><p> + Specifies that SASL authentication has completed. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + SASL outcome "additional data", specific to the SASL mechanism + being used. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +BackendKeyData (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('K') +</span></dt><dd><p> + Identifies the message as cancellation key data. + The frontend must save these values if it wishes to be + able to issue CancelRequest messages later. +</p></dd><dt><span class="term"> + Int32(12) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The process ID of this backend. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The secret key of this backend. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Bind (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('B') +</span></dt><dd><p> + Identifies the message as a Bind command. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the destination portal + (an empty string selects the unnamed portal). +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the source prepared statement + (an empty string selects the unnamed prepared statement). +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of parameter format codes that follow + (denoted <em class="replaceable"><code>C</code></em> below). + This can be zero to indicate that there are no parameters + or that the parameters all use the default format (text); + or one, in which case the specified format code is applied + to all parameters; or it can equal the actual number of + parameters. +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>C</code></em>] +</span></dt><dd><p> + The parameter format codes. Each must presently be + zero (text) or one (binary). +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of parameter values that follow (possibly zero). + This must match the number of parameters needed by the query. +</p></dd></dl></div><p> + Next, the following pair of fields appear for each parameter: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + The length of the parameter value, in bytes (this count + does not include itself). Can be zero. + As a special case, -1 indicates a NULL parameter value. + No value bytes follow in the NULL case. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + The value of the parameter, in the format indicated by the + associated format code. + <em class="replaceable"><code>n</code></em> is the above length. +</p></dd></dl></div><p> + After the last parameter, the following fields appear: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of result-column format codes that follow + (denoted <em class="replaceable"><code>R</code></em> below). + This can be zero to indicate that there are no result columns + or that the result columns should all use the default format + (text); + or one, in which case the specified format code is applied + to all result columns (if any); or it can equal the actual + number of result columns of the query. +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>R</code></em>] +</span></dt><dd><p> + The result-column format codes. Each must presently be + zero (text) or one (binary). +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +BindComplete (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('2') +</span></dt><dd><p> + Identifies the message as a Bind-complete indicator. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CancelRequest (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32(16) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(80877102) +</span></dt><dd><p> + The cancel request code. The value is chosen to contain + <code class="literal">1234</code> in the most significant 16 bits, and <code class="literal">5678</code> in the + least significant 16 bits. (To avoid confusion, this code + must not be the same as any protocol version number.) +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The process ID of the target backend. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The secret key for the target backend. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Close (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('C') +</span></dt><dd><p> + Identifies the message as a Close command. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte1 +</span></dt><dd><p> + '<code class="literal">S</code>' to close a prepared statement; or + '<code class="literal">P</code>' to close a portal. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the prepared statement or portal to close + (an empty string selects the unnamed prepared statement + or portal). +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +CloseComplete (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('3') +</span></dt><dd><p> + Identifies the message as a Close-complete indicator. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CommandComplete (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('C') +</span></dt><dd><p> + Identifies the message as a command-completed response. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The command tag. This is usually a single + word that identifies which SQL command was completed. + </p><p> + For an <code class="command">INSERT</code> command, the tag is + <code class="literal">INSERT <em class="replaceable"><code>oid</code></em> + <em class="replaceable"><code>rows</code></em></code>, where + <em class="replaceable"><code>rows</code></em> is the number of rows + inserted. <em class="replaceable"><code>oid</code></em> used to be the object ID + of the inserted row if <em class="replaceable"><code>rows</code></em> was 1 + and the target table had OIDs, but OIDs system columns are + not supported anymore; therefore <em class="replaceable"><code>oid</code></em> + is always 0. + </p><p> + For a <code class="command">DELETE</code> command, the tag is + <code class="literal">DELETE <em class="replaceable"><code>rows</code></em></code> where + <em class="replaceable"><code>rows</code></em> is the number of rows deleted. + </p><p> + For an <code class="command">UPDATE</code> command, the tag is + <code class="literal">UPDATE <em class="replaceable"><code>rows</code></em></code> where + <em class="replaceable"><code>rows</code></em> is the number of rows updated. + </p><p> + For a <code class="command">SELECT</code> or <code class="command">CREATE TABLE AS</code> + command, the tag is <code class="literal">SELECT <em class="replaceable"><code>rows</code></em></code> + where <em class="replaceable"><code>rows</code></em> is the number of rows retrieved. + </p><p> + For a <code class="command">MOVE</code> command, the tag is + <code class="literal">MOVE <em class="replaceable"><code>rows</code></em></code> where + <em class="replaceable"><code>rows</code></em> is the number of rows the + cursor's position has been changed by. + </p><p> + For a <code class="command">FETCH</code> command, the tag is + <code class="literal">FETCH <em class="replaceable"><code>rows</code></em></code> where + <em class="replaceable"><code>rows</code></em> is the number of rows that + have been retrieved from the cursor. + </p><p> + For a <code class="command">COPY</code> command, the tag is + <code class="literal">COPY <em class="replaceable"><code>rows</code></em></code> where + <em class="replaceable"><code>rows</code></em> is the number of rows copied. + (Note: the row count appears only in + <span class="productname">PostgreSQL</span> 8.2 and later.) + </p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CopyData (F & B) +</span></dt><dd><p> +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('d') +</span></dt><dd><p> + Identifies the message as <code class="command">COPY</code> data. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + Data that forms part of a <code class="command">COPY</code> data stream. Messages sent + from the backend will always correspond to single data rows, + but messages sent by frontends might divide the data stream + arbitrarily. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +CopyDone (F & B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('c') +</span></dt><dd><p> + Identifies the message as a <code class="command">COPY</code>-complete indicator. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CopyFail (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('f') +</span></dt><dd><p> + Identifies the message as a <code class="command">COPY</code>-failure indicator. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + An error message to report as the cause of failure. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CopyInResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('G') +</span></dt><dd><p> + Identifies the message as a Start Copy In response. + The frontend must now send copy-in data (if not + prepared to do so, send a CopyFail message). +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int8 +</span></dt><dd><p> + 0 indicates the overall <code class="command">COPY</code> format is textual (rows + separated by newlines, columns separated by separator + characters, etc). + 1 indicates the overall copy format is binary (similar + to DataRow format). + See <a class="xref" href="sql-copy.html" title="COPY"><span class="refentrytitle">COPY</span></a> + for more information. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of columns in the data to be copied + (denoted <em class="replaceable"><code>N</code></em> below). +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>N</code></em>] +</span></dt><dd><p> + The format codes to be used for each column. + Each must presently be zero (text) or one (binary). + All must be zero if the overall copy format is textual. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CopyOutResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('H') +</span></dt><dd><p> + Identifies the message as a Start Copy Out response. + This message will be followed by copy-out data. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int8 +</span></dt><dd><p> + 0 indicates the overall <code class="command">COPY</code> format + is textual (rows separated by newlines, columns + separated by separator characters, etc). 1 indicates + the overall copy format is binary (similar to DataRow + format). See <a class="xref" href="sql-copy.html" title="COPY"><span class="refentrytitle">COPY</span></a> for more information. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of columns in the data to be copied + (denoted <em class="replaceable"><code>N</code></em> below). +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>N</code></em>] +</span></dt><dd><p> + The format codes to be used for each column. + Each must presently be zero (text) or one (binary). + All must be zero if the overall copy format is textual. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +CopyBothResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('W') +</span></dt><dd><p> + Identifies the message as a Start Copy Both response. + This message is used only for Streaming Replication. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int8 +</span></dt><dd><p> + 0 indicates the overall <code class="command">COPY</code> format + is textual (rows separated by newlines, columns + separated by separator characters, etc). 1 indicates + the overall copy format is binary (similar to DataRow + format). See <a class="xref" href="sql-copy.html" title="COPY"><span class="refentrytitle">COPY</span></a> for more information. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of columns in the data to be copied + (denoted <em class="replaceable"><code>N</code></em> below). +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>N</code></em>] +</span></dt><dd><p> + The format codes to be used for each column. + Each must presently be zero (text) or one (binary). + All must be zero if the overall copy format is textual. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +DataRow (B) +</span></dt><dd><p> +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('D') +</span></dt><dd><p> + Identifies the message as a data row. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of column values that follow (possibly zero). +</p></dd></dl></div><p> + Next, the following pair of fields appear for each column: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + The length of the column value, in bytes (this count + does not include itself). Can be zero. + As a special case, -1 indicates a NULL column value. + No value bytes follow in the NULL case. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + The value of the column, in the format indicated by the + associated format code. + <em class="replaceable"><code>n</code></em> is the above length. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Describe (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('D') +</span></dt><dd><p> + Identifies the message as a Describe command. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte1 +</span></dt><dd><p> + '<code class="literal">S</code>' to describe a prepared statement; or + '<code class="literal">P</code>' to describe a portal. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the prepared statement or portal to describe + (an empty string selects the unnamed prepared statement + or portal). +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +EmptyQueryResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('I') +</span></dt><dd><p> + Identifies the message as a response to an empty query string. + (This substitutes for CommandComplete.) +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +ErrorResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('E') +</span></dt><dd><p> + Identifies the message as an error. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + The message body consists of one or more identified fields, + followed by a zero byte as a terminator. Fields can appear in + any order. For each field there is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1 +</span></dt><dd><p> + A code identifying the field type; if zero, this is + the message terminator and no string follows. + The presently defined field types are listed in + <a class="xref" href="protocol-error-fields.html" title="52.8. Error and Notice Message Fields">Section 52.8</a>. + Since more field types might be added in future, + frontends should silently ignore fields of unrecognized + type. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The field value. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Execute (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('E') +</span></dt><dd><p> + Identifies the message as an Execute command. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the portal to execute + (an empty string selects the unnamed portal). +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Maximum number of rows to return, if portal contains + a query that returns rows (ignored otherwise). Zero + denotes <span class="quote">“<span class="quote">no limit</span>”</span>. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +Flush (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('H') +</span></dt><dd><p> + Identifies the message as a Flush command. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +FunctionCall (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('F') +</span></dt><dd><p> + Identifies the message as a function call. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Specifies the object ID of the function to call. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of argument format codes that follow + (denoted <em class="replaceable"><code>C</code></em> below). + This can be zero to indicate that there are no arguments + or that the arguments all use the default format (text); + or one, in which case the specified format code is applied + to all arguments; or it can equal the actual number of + arguments. +</p></dd><dt><span class="term"> + Int16[<em class="replaceable"><code>C</code></em>] +</span></dt><dd><p> + The argument format codes. Each must presently be + zero (text) or one (binary). +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + Specifies the number of arguments being supplied to the + function. +</p></dd></dl></div><p> + Next, the following pair of fields appear for each argument: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + The length of the argument value, in bytes (this count + does not include itself). Can be zero. + As a special case, -1 indicates a NULL argument value. + No value bytes follow in the NULL case. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + The value of the argument, in the format indicated by the + associated format code. + <em class="replaceable"><code>n</code></em> is the above length. +</p></dd></dl></div><p> + After the last argument, the following field appears: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int16 +</span></dt><dd><p> + The format code for the function result. Must presently be + zero (text) or one (binary). +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +FunctionCallResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('V') +</span></dt><dd><p> + Identifies the message as a function call result. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The length of the function result value, in bytes (this count + does not include itself). Can be zero. + As a special case, -1 indicates a NULL function result. + No value bytes follow in the NULL case. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + The value of the function result, in the format indicated by + the associated format code. + <em class="replaceable"><code>n</code></em> is the above length. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +GSSResponse (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('p') +</span></dt><dd><p> + Identifies the message as a GSSAPI or SSPI response. Note that + this is also used for SASL and password response messages. + The exact message type can be deduced from the context. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + GSSAPI/SSPI specific message data. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +NegotiateProtocolVersion (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('v') +</span></dt><dd><p> + Identifies the message as a protocol version negotiation + message. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Newest minor protocol version supported by the server + for the major protocol version requested by the client. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Number of protocol options not recognized by the server. +</p></dd></dl></div><p> + Then, for protocol option not recognized by the server, there + is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + String +</span></dt><dd><p> + The option name. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +NoData (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('n') +</span></dt><dd><p> + Identifies the message as a no-data indicator. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +NoticeResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('N') +</span></dt><dd><p> + Identifies the message as a notice. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + The message body consists of one or more identified fields, + followed by a zero byte as a terminator. Fields can appear in + any order. For each field there is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1 +</span></dt><dd><p> + A code identifying the field type; if zero, this is + the message terminator and no string follows. + The presently defined field types are listed in + <a class="xref" href="protocol-error-fields.html" title="52.8. Error and Notice Message Fields">Section 52.8</a>. + Since more field types might be added in future, + frontends should silently ignore fields of unrecognized + type. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The field value. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +NotificationResponse (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('A') +</span></dt><dd><p> + Identifies the message as a notification response. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The process ID of the notifying backend process. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the channel that the notify has been raised on. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The <span class="quote">“<span class="quote">payload</span>”</span> string passed from the notifying process. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +ParameterDescription (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('t') +</span></dt><dd><p> + Identifies the message as a parameter description. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of parameters used by the statement + (can be zero). +</p></dd></dl></div><p> + Then, for each parameter, there is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + Specifies the object ID of the parameter data type. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +ParameterStatus (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('S') +</span></dt><dd><p> + Identifies the message as a run-time parameter status report. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the run-time parameter being reported. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The current value of the parameter. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +Parse (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('P') +</span></dt><dd><p> + Identifies the message as a Parse command. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The name of the destination prepared statement + (an empty string selects the unnamed prepared statement). +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The query string to be parsed. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The number of parameter data types specified + (can be zero). Note that this is not an indication of + the number of parameters that might appear in the + query string, only the number that the frontend wants to + prespecify types for. +</p></dd></dl></div><p> + Then, for each parameter, there is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + Specifies the object ID of the parameter data type. + Placing a zero here is equivalent to leaving the type + unspecified. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +ParseComplete (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('1') +</span></dt><dd><p> + Identifies the message as a Parse-complete indicator. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +PasswordMessage (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('p') +</span></dt><dd><p> + Identifies the message as a password response. Note that + this is also used for GSSAPI, SSPI and SASL response messages. + The exact message type can be deduced from the context. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The password (encrypted, if requested). +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +PortalSuspended (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('s') +</span></dt><dd><p> + Identifies the message as a portal-suspended indicator. + Note this only appears if an Execute message's row-count limit + was reached. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Query (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('Q') +</span></dt><dd><p> + Identifies the message as a simple query. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The query string itself. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +ReadyForQuery (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('Z') +</span></dt><dd><p> + Identifies the message type. ReadyForQuery is sent + whenever the backend is ready for a new query cycle. +</p></dd><dt><span class="term"> + Int32(5) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte1 +</span></dt><dd><p> + Current backend transaction status indicator. + Possible values are '<code class="literal">I</code>' if idle (not in + a transaction block); '<code class="literal">T</code>' if in a transaction + block; or '<code class="literal">E</code>' if in a failed transaction + block (queries will be rejected until block is ended). +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +RowDescription (B) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('T') +</span></dt><dd><p> + Identifies the message as a row description. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + Specifies the number of fields in a row (can be zero). +</p></dd></dl></div><p> + Then, for each field, there is the following: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + String +</span></dt><dd><p> + The field name. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + If the field can be identified as a column of a specific + table, the object ID of the table; otherwise zero. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + If the field can be identified as a column of a specific + table, the attribute number of the column; otherwise zero. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The object ID of the field's data type. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The data type size (see <code class="varname">pg_type.typlen</code>). + Note that negative values denote variable-width types. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + The type modifier (see <code class="varname">pg_attribute.atttypmod</code>). + The meaning of the modifier is type-specific. +</p></dd><dt><span class="term"> + Int16 +</span></dt><dd><p> + The format code being used for the field. Currently will + be zero (text) or one (binary). In a RowDescription + returned from the statement variant of Describe, the + format code is not yet known and will always be zero. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +SASLInitialResponse (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('p') +</span></dt><dd><p> + Identifies the message as an initial SASL response. Note that + this is also used for GSSAPI, SSPI and password response messages. + The exact message type is deduced from the context. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + Name of the SASL authentication mechanism that the client + selected. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of SASL mechanism specific "Initial Client Response" that + follows, or -1 if there is no Initial Response. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + SASL mechanism specific "Initial Response". +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +SASLResponse (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('p') +</span></dt><dd><p> + Identifies the message as a SASL response. Note that + this is also used for GSSAPI, SSPI and password response messages. + The exact message type can be deduced from the context. +</p></dd><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Byte<em class="replaceable"><code>n</code></em> +</span></dt><dd><p> + SASL mechanism specific message data. +</p></dd></dl></div><p> +</p></dd><dt><span class="term"> +SSLRequest (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(80877103) +</span></dt><dd><p> + The <acronym class="acronym">SSL</acronym> request code. The value is chosen to contain + <code class="literal">1234</code> in the most significant 16 bits, and <code class="literal">5679</code> in the + least significant 16 bits. (To avoid confusion, this code + must not be the same as any protocol version number.) +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +GSSENCRequest (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32(8) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(80877104) +</span></dt><dd><p> + The <acronym class="acronym">GSSAPI</acronym> Encryption request code. The value is chosen to contain + <code class="literal">1234</code> in the most significant 16 bits, and <code class="literal">5680</code> in the + least significant 16 bits. (To avoid confusion, this code + must not be the same as any protocol version number.) +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +StartupMessage (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Int32 +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd><dt><span class="term"> + Int32(196608) +</span></dt><dd><p> + The protocol version number. The most significant 16 bits are + the major version number (3 for the protocol described here). + The least significant 16 bits are the minor version number + (0 for the protocol described here). +</p></dd></dl></div><p> + The protocol version number is followed by one or more pairs of + parameter name and value strings. A zero byte is required as a + terminator after the last name/value pair. + Parameters can appear in any + order. <code class="literal">user</code> is required, others are optional. + Each parameter is specified as: +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + String +</span></dt><dd><p> + The parameter name. Currently recognized names are: + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + <code class="literal">user</code> +</span></dt><dd><p> + The database user name to connect as. Required; + there is no default. +</p></dd><dt><span class="term"> + <code class="literal">database</code> +</span></dt><dd><p> + The database to connect to. Defaults to the user name. +</p></dd><dt><span class="term"> + <code class="literal">options</code> +</span></dt><dd><p> + Command-line arguments for the backend. (This is + deprecated in favor of setting individual run-time + parameters.) Spaces within this string are + considered to separate arguments, unless escaped with + a backslash (<code class="literal">\</code>); write <code class="literal">\\</code> to + represent a literal backslash. +</p></dd><dt><span class="term"> + <code class="literal">replication</code> +</span></dt><dd><p> + Used to connect in streaming replication mode, where + a small set of replication commands can be issued + instead of SQL statements. Value can be + <code class="literal">true</code>, <code class="literal">false</code>, or + <code class="literal">database</code>, and the default is + <code class="literal">false</code>. See + <a class="xref" href="protocol-replication.html" title="52.4. Streaming Replication Protocol">Section 52.4</a> for details. +</p></dd></dl></div><p> + + In addition to the above, other parameters may be listed. + Parameter names beginning with <code class="literal">_pq_.</code> are + reserved for use as protocol extensions, while others are + treated as run-time parameters to be set at backend start + time. Such settings will be applied during backend start + (after parsing the command-line arguments if any) and will + act as session defaults. +</p></dd><dt><span class="term"> + String +</span></dt><dd><p> + The parameter value. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Sync (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('S') +</span></dt><dd><p> + Identifies the message as a Sync command. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd><dt><span class="term"> +Terminate (F) +</span></dt><dd><p> + +</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"> + Byte1('X') +</span></dt><dd><p> + Identifies the message as a termination. +</p></dd><dt><span class="term"> + Int32(4) +</span></dt><dd><p> + Length of message contents in bytes, including self. +</p></dd></dl></div><p> + +</p></dd></dl></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="protocol-message-types.html" title="52.6. Message Data Types">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="protocol.html" title="Chapter 52. Frontend/Backend Protocol">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="protocol-error-fields.html" title="52.8. Error and Notice Message Fields">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.6. Message Data Types </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 52.8. Error and Notice Message Fields</td></tr></table></div></body></html>
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