SQLite

set rcsid {$Id: capi3.tcl,v 1.9 2005/03/11 04:39:58 drh Exp $}
source common.tcl
header {C/C++ Interface For SQLite Version 3}

proc AddHyperlinks {txt} {
  regsub -all {([^:alnum:>])(sqlite3_\w+)(\([^\)]*\))} $txt \
      {\1<a href="capi3ref.html#\2">\2</a>\3} t2
  puts $t2
}

AddHyperlinks {
<h2>C/C++ Interface For SQLite Version 3</h2>

<h3>1.0 Overview</h3>

<p>
SQLite version 3.0 is a new version of SQLite, derived from
the SQLite 2.8.13 code base, but with an incompatible file format

All prepared statements must be finalized before the database can be
closed.
The sqlite3_reset() routine resets a prepared SQL statement so that it
can be executed again.
</p>

<p>
The SQL statement may contain tokens of the form "?" or "?nnn" or ":aaa"
where "nnn" is an integer and "aaa" is an identifier.
Such tokens represent unspecified literal values (or "wildcards")
to be filled in later by the 
<a href="capi3ref.html#sqlite3_bind_blob">sqlite3_bind</a> interface.
Each wildcard has an associated number which is its sequence in the
statement or the "nnn" in the case of a "?nnn" form. 

It is allowed for the same wildcard
to occur more than once in the same SQL statement, in which case
all instance of that wildcard will be filled in with the same value.
Unbound wildcards have a value of NULL.
</p>

<blockquote><pre>
   int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));

works similarly to
sqlite3_column_count() except that it only works following sqlite3_step().
If the previous call to sqlite3_step() returned SQLITE_DONE or an error code,
then sqlite3_data_count() will return 0 whereas sqlite3_column_count() will
continue to return the number of columns in the result set.
</p>

<p>Returned data is examined using the other sqlite3_column_***() functions, 
all of which take a column number as their second parameter. Columns are
zero-indexed from left to right. Note that this is different to parameters,
which are indexed starting at one.
</p>

<p>
The sqlite3_column_type() function returns the

set rcsid {$Id: capi3ref.tcl,v 1.18 2005/03/11 04:39:58 drh Exp $}
source common.tcl
header {C/C++ Interface For SQLite Version 3}
puts {
<h2>C/C++ Interface For SQLite Version 3</h2>
}

proc api {name prototype desc {notused x}} {

  If there is no parameter with the given name, return 0.
  The string zName is always in the UTF-8 encoding.
}

api {} {
  int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);
} {
 This routine identifies a callback function that might be invoked
 whenever an attempt is made to open a database table 
 that another thread or process has locked.
 If the busy callback is NULL, then SQLITE_BUSY is returned immediately
 upon encountering the lock.
 If the busy callback is not NULL, then the
 callback might invoked with two arguments.  The
 second argument is the number of prior calls to the busy callback
 for the same lock.  If the
 busy callback returns 0, then no additional attempts are made to
 access the database and SQLITE_BUSY is returned.
 If the callback returns non-zero, then another attempt is made to open the
 database for reading and the cycle repeats.

 That a busy handler is registered does not guarantee that
 it will be invoked when there is lock contention.
 If SQLite determines that invoking the busy handler could result in
 a deadlock, it will return SQLITE_BUSY instead.
 Consider a scenario where one process is holding a read lock that
 it is trying to promote to a reserved lock and
 a second process is holding a reserved lock that it is trying
 to promote to an exclusive lock.  The first process cannot proceed
 because it is blocked by the second and the second process cannot
 proceed because it is blocked by the first.  If both processes
 invoke the busy handlers, neither will make any progress.  Therefore,
 SQLite returns SQLITE_BUSY for the first process, hoping that this
 will induce the first process to release its read lock and allow
 the second process to proceed.

 The default busy callback is NULL.

 Sqlite is re-entrant, so the busy handler may start a new query. 
 (It is not clear why anyone would every want to do this, but it
 is allowed, in theory.)  But the busy handler may not close the
 database.  Closing the database from a busy handler will delete 

}


proc chng {date desc} {
  puts "<DT><B>$date</B></DT>"
  puts "<DD><P><UL>$desc</UL></P></DD>"
}

chng {2005 February 19 (3.1.4)} {
<li>Fix a bug in autovacuum that could cause database corruption if
a CREATE UNIQUE INDEX fails because of a constraint violation.
This problem only occurs if the new autovacuum feature introduced in
version 3.1 is turned on.</li>
<li>The F_FULLSYNC ioctl (currently only supported on OS-X) is disabled
if the synchronous pragma is set to something other than "full".</li>
<li>Add additional forward compatibility to the future version 3.2 database 
file format.</li>
<li>Fix a bug in WHERE clauses of the form (rowid<'2')</li>
<li>New SQLITE_OMIT_... compile-time options added</li>
<li>Updates to the man page</li>
<li>Remove the use of strcasecmp() from the shell</li>
<li>Windows DLL exports symbols Tclsqlite_Init and Sqlite_Init</li>
}

chng {2005 February 19 (3.1.3)} {
<li>Fix a problem with VACUUM on databases from which tables containing
AUTOINCREMENT have been dropped.</li>
<li>Add forward compatibility to the future version 3.2 database file
format.</li>
<li>Documentation updates</li>

<li>Supports databases up to 2 terabytes
    (2<sup><small>41</small></sup> bytes) in size.</li>
<li>Sizes of strings and BLOBs limited only by available memory.</li>
<li>Small code footprint: less than 30K lines of C code,
    less than 250KB code space (gcc on i486)</li>
<li><a href="speed.html">Faster</a> than popular client/server database
    engines for most common operations.</li>
<li>Simple, easy to use <a href="capi3.html">API</a>.</li>
<li><a href="tclsqlite.html">TCL bindings</a> included.
    Bindings for many other languages 
    <a href="http://www.sqlite.org/cvstrac/wiki?p=SqliteWrappers">
    available separately.</a></li>
<li>Well-commented source code with over 95% test coverage.</li>
<li>Self-contained: no external dependencies.</li>
<li>Sources are in the <a href="copyright.html">public domain</a>.

proc newsitem {date title text} {
  puts "<h3>$date - $title</h3>"
  regsub -all "\n( *\n)+" $text "</p>\n\n<p>" txt
  puts "<p>$txt</p>"
  puts "<hr width=\"50%\">"
}

newsitem {2005-Mar-10} {Version 3.1.4 Released} {
  Version 3.1.4 fixes a critical bug that could cause database corruption
  if the autovacuum mode of version 3.1.0 is turned on (it is off by
  default) and a CREATE UNIQUE INDEX is executed within a transaction but
  fails because the indexed columns are not unique.  Anyone using the
  autovacuum feature and unique indices should upgrade.

  Other changes in version 3.1.4 include the ability to disable
  the F_FULLSYNC ioctl() by setting "PRAGMA synchronous=on" instead
  of the default "PRAGMA synchronous=full".
}

newsitem {2005-Feb-19} {Version 3.1.3 Released} {
  Version 3.1.3 cleans up some minor issues discovered in version 3.1.2.
}

newsitem {2005-Feb-15} {Versions 2.8.16 and 3.1.2 Released} {
  A critical bug in the VACUUM command that can lead to database

}
  

puts {
<p align="right"><a href="oldnews.html">Old news...</a></p>
</td></tr></table>
}
footer {$Id: index.tcl,v 1.109 2005/03/11 04:39:58 drh Exp $}