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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:28:19 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:28:19 +0000 |
commit | 18657a960e125336f704ea058e25c27bd3900dcb (patch) | |
tree | 17b438b680ed45a996d7b59951e6aa34023783f2 /www/c3ref/table_column_metadata.html | |
parent | Initial commit. (diff) | |
download | sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.tar.xz sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.zip |
Adding upstream version 3.40.1.upstream/3.40.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'www/c3ref/table_column_metadata.html')
-rw-r--r-- | www/c3ref/table_column_metadata.html | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/www/c3ref/table_column_metadata.html b/www/c3ref/table_column_metadata.html new file mode 100644 index 0000000..d641f69 --- /dev/null +++ b/www/c3ref/table_column_metadata.html @@ -0,0 +1,205 @@ +<!DOCTYPE html> +<html><head> +<meta name="viewport" content="width=device-width, initial-scale=1.0"> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<link href="../sqlite.css" rel="stylesheet"> +<title>Extract Metadata About A Column Of A Table</title> +<!-- path=../ --> +</head> +<body> +<div class=nosearch> +<a href="../index.html"> +<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0"> +</a> +<div><!-- IE hack to prevent disappearing logo --></div> +<div class="tagline desktoponly"> +Small. Fast. Reliable.<br>Choose any three. +</div> +<div class="menu mainmenu"> +<ul> +<li><a href="../index.html">Home</a> +<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a> +<li class='wideonly'><a href='../about.html'>About</a> +<li class='desktoponly'><a href="../docs.html">Documentation</a> +<li class='desktoponly'><a href="../download.html">Download</a> +<li class='wideonly'><a href='../copyright.html'>License</a> +<li class='desktoponly'><a href="../support.html">Support</a> +<li class='desktoponly'><a href="../prosupport.html">Purchase</a> +<li class='search' id='search_menubutton'> +<a href="javascript:void(0)" onclick='toggle_search()'>Search</a> +</ul> +</div> +<div class="menu submenu" id="submenu"> +<ul> +<li><a href='../about.html'>About</a> +<li><a href='../docs.html'>Documentation</a> +<li><a href='../download.html'>Download</a> +<li><a href='../support.html'>Support</a> +<li><a href='../prosupport.html'>Purchase</a> +</ul> +</div> +<div class="searchmenu" id="searchmenu"> +<form method="GET" action="../search"> +<select name="s" id="searchtype"> +<option value="d">Search Documentation</option> +<option value="c">Search Changelog</option> +</select> +<input type="text" name="q" id="searchbox" value=""> +<input type="submit" value="Go"> +</form> +</div> +</div> +<script> +function toggle_div(nm) { +var w = document.getElementById(nm); +if( w.style.display=="block" ){ +w.style.display = "none"; +}else{ +w.style.display = "block"; +} +} +function toggle_search() { +var w = document.getElementById("searchmenu"); +if( w.style.display=="block" ){ +w.style.display = "none"; +} else { +w.style.display = "block"; +setTimeout(function(){ +document.getElementById("searchbox").focus() +}, 30); +} +} +function div_off(nm){document.getElementById(nm).style.display="none";} +window.onbeforeunload = function(e){div_off("submenu");} +/* Disable the Search feature if we are not operating from CGI, since */ +/* Search is accomplished using CGI and will not work without it. */ +if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){ +document.getElementById("search_menubutton").style.display = "none"; +} +/* Used by the Hide/Show button beside syntax diagrams, to toggle the */ +function hideorshow(btn,obj){ +var x = document.getElementById(obj); +var b = document.getElementById(btn); +if( x.style.display!='none' ){ +x.style.display = 'none'; +b.innerHTML='show'; +}else{ +x.style.display = ''; +b.innerHTML='hide'; +} +return false; +} +var antiRobot = 0; +function antiRobotGo(){ +if( antiRobot!=3 ) return; +antiRobot = 7; +var j = document.getElementById("mtimelink"); +if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href"); +} +function antiRobotDefense(){ +document.body.onmousedown=function(){ +antiRobot |= 2; +antiRobotGo(); +document.body.onmousedown=null; +} +document.body.onmousemove=function(){ +antiRobot |= 2; +antiRobotGo(); +document.body.onmousemove=null; +} +setTimeout(function(){ +antiRobot |= 1; +antiRobotGo(); +}, 100) +antiRobotGo(); +} +antiRobotDefense(); +</script> +<!-- keywords: sqlite3_table_column_metadata --> +<div class=nosearch> +<a href="intro.html"><h2>SQLite C Interface</h2></a> +<h2>Extract Metadata About A Column Of A Table</h2> +</div> +<blockquote><pre> +int sqlite3_table_column_metadata( + sqlite3 *db, /* Connection handle */ + const char *zDbName, /* Database name or NULL */ + const char *zTableName, /* Table name */ + const char *zColumnName, /* Column name */ + char const **pzDataType, /* OUTPUT: Declared data type */ + char const **pzCollSeq, /* OUTPUT: Collation sequence name */ + int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */ + int *pPrimaryKey, /* OUTPUT: True if column part of PK */ + int *pAutoinc /* OUTPUT: True if column is auto-increment */ +); +</pre></blockquote> +<p> +The sqlite3_table_column_metadata(X,D,T,C,....) routine returns +information about column C of table T in database D +on <a href="../c3ref/sqlite3.html">database connection</a> X. The sqlite3_table_column_metadata() +interface returns SQLITE_OK and fills in the non-NULL pointers in +the final five arguments with appropriate values if the specified +column exists. The sqlite3_table_column_metadata() interface returns +SQLITE_ERROR if the specified column does not exist. +If the column-name parameter to sqlite3_table_column_metadata() is a +NULL pointer, then this routine simply checks for the existence of the +table and returns SQLITE_OK if the table exists and SQLITE_ERROR if it +does not. If the table name parameter T in a call to +sqlite3_table_column_metadata(X,D,T,C,...) is NULL then the result is +undefined behavior.</p> + +<p>The column is identified by the second, third and fourth parameters to +this function. The second parameter is either the name of the database +(i.e. "main", "temp", or an attached database) containing the specified +table or NULL. If it is NULL, then all attached databases are searched +for the table using the same algorithm used by the database engine to +resolve unqualified table references.</p> + +<p>The third and fourth parameters to this function are the table and column +name of the desired column, respectively.</p> + +<p>Metadata is returned by writing to the memory locations passed as the 5th +and subsequent parameters to this function. Any of these arguments may be +NULL, in which case the corresponding element of metadata is omitted.</p> + +<p><blockquote> +<table border="1"> +<tr><th> Parameter <th> Output<br>Type <th> Description</p> + +<p><tr><td> 5th <td> const char* <td> Data type +<tr><td> 6th <td> const char* <td> Name of default collation sequence +<tr><td> 7th <td> int <td> True if column has a NOT NULL constraint +<tr><td> 8th <td> int <td> True if column is part of the PRIMARY KEY +<tr><td> 9th <td> int <td> True if column is <a href="../autoinc.html">AUTOINCREMENT</a> +</table> +</blockquote></p> + +<p>The memory pointed to by the character pointers returned for the +declaration type and collation sequence is valid until the next +call to any SQLite API function.</p> + +<p>If the specified table is actually a view, an <a href="../rescode.html">error code</a> is returned.</p> + +<p>If the specified column is "rowid", "oid" or "_rowid_" and the table +is not a <a href="../withoutrowid.html">WITHOUT ROWID</a> table and an +<a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> column has been explicitly declared, then the output +parameters are set for the explicitly declared column. If there is no +<a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> column, then the outputs +for the <a href="../lang_createtable.html#rowid">rowid</a> are set as follows:</p> + +<p><pre> +data type: "INTEGER" +collation sequence: "BINARY" +not null: 0 +primary key: 1 +auto increment: 0 +</pre></p> + +<p>This function causes all database schemas to be read from disk and +parsed, if that has not already been done, and returns an error if +any errors are encountered while loading the schema. +</p><p>See also lists of + <a href="objlist.html">Objects</a>, + <a href="constlist.html">Constants</a>, and + <a href="funclist.html">Functions</a>.</p> + |