SQLite

3.0.7

}


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

chng {2004 September 18 (3.0.7)} {
<li>The BTree module allocates large buffers using malloc() instead of
    off of the stack, in order to play better on machines with limited
    stack space.</li>
<li>Fixed naming conflicts so that versions 2.8 and 3.0 can be
    linked and used together in the same ANSI-C source file.</li>
<li>New interface: sqlite3_bind_parameter_index()</li>
<li>Add support for wildcard parameters of the form: "?nnn"</li>
<li>Fix problems found on 64-bit systems.</li>
<li>Removed encode.c file (containing unused routines) from the 
    version 3.0 source tree.</li>
<li>The sqlite3_trace() callbacks occur before each statement
    is executed, not when the statement is compiled.</li>
<li>Makefile updates and miscellaneous bug fixes.</li>
}

chng {2004 September 02 (3.0.6 beta)} {
<li>Better detection and handling of corrupt database files.</li>
<li>The sqlite3_step() interface returns SQLITE_BUSY if it is unable
    to commit a change because of a lock</li>
<li>Combine the implementations of LIKE and GLOB into a single
    pattern-matching subroutine.</li>

# This script generates the "docs.html" page that describes various
# sources of documentation available for SQLite.
#
set rcsid {$Id: docs.tcl,v 1.6 2004/09/18 18:00:24 drh Exp $}
source common.tcl
header {SQLite Documentation}
puts {
<h2>Available Documentation</h2>
<table width="100%" cellpadding="5">
}

proc doc {name url desc} {
  puts {<tr><td valign="top" align="right">}
  regsub -all { +} $name {\&nbsp;} name
  puts "<a href=\"$url\">$name</a></td>"
  puts {<td width="10"></td>}
  puts {<td align="top" align="left">}
  puts $desc
  puts {</td></tr>}
}

doc {SQLite In 5 Minutes Or Less} {quickstart.html} {
  A very quick introduction to programming with SQLite.
}

doc {SQL Syntax} {lang.html} {
  This document describes the SQL language that is understood by
  SQLite.  
}

doc {Version 2 C/C++ API} {c_interface.html} {

#
# Run this script to generated a faq.html output file
#
set rcsid {$Id: faq.tcl,v 1.25 2004/09/18 18:00:24 drh Exp $}
source common.tcl
header {SQLite Frequently Asked Questions</title>}

set cnt 1
proc faq {question answer} {
  set ::faq($::cnt) [list [string trim $question] [string trim $answer]]
  incr ::cnt

  semi-random key generation algorithm of SQLite version 2.3.3 and
  earlier.</p>

  <p>Beginning with version 2.2.3, there is a new API function named
  <b>sqlite_last_insert_rowid()</b> which will return the integer key
  for the most recent insert operation.  See the API documentation for
  details.</p>

  <p>SQLite version 3.0 expands the size of the rowid to 64 bits.</p>
}

faq {
  What datatypes does SQLite support?
} {
  <p>SQLite ignores
  the datatype information that follows the column name in CREATE TABLE.
  You can put any type of data you want
  into any column, without regard to the declared datatype of that column.
  </p>

  <p>An exception to this rule is a column of type INTEGER PRIMARY KEY.
  Such columns must hold an integer.  An attempt to put a non-integer
  value into an INTEGER PRIMARY KEY column will generate an error.</p>

  <p>There is a page on <a href="datatypes.html">datatypes in SQLite
  version 2.8</a>
  and another for <a href="datatype3.html">version 3.0</a>
  that explains this concept further.</p>
}

faq {
  SQLite lets me insert a string into a database column of type integer!
} {
  <p>This is a feature, not a bug.  SQLite does not enforce data type
  constraints.  Any data can be
  inserted into any column.  You can put arbitrary length strings into
  integer columns, floating point numbers in boolean columns, or dates
  in character columns.  The datatype you assign to a column in the
  CREATE TABLE command does not restrict what data can be put into
  that column.  Every column is able to hold
  an arbitrary length string.  (There is one exception: Columns of
  type INTEGER PRIMARY KEY may only hold an integer.  An error will result

  <p>In the sequence on the left, the second insert will fail.  In this case,
  the strings '0' and '0.0' are treated as numbers since they are being 
  inserted into a numeric column and 0==0.0 which violates the uniqueness
  constraint.  But the second insert in the right-hand sequence works.  In
  this case, the constants 0 and 0.0 are treated a strings which means that
  they are distinct.</p>

  <p>There is a page on <a href="datatypes.html">datatypes in SQLite
  version 2.8</a>
  and another for <a href="datatype3.html">version 3.0</a>
  that explains this concept further.</p>
}

faq {
  Why does SQLite think that the expression '0'=='00' is TRUE?
} {
  <p>As of version 2.7.0, it doesn't.</p>

SELECT count(*) FROM t3 WHERE b=='00';
</pre></blockquote>

  <p>In this case the answer is 0.  B is a text column so a text comparison
  is done against '00'.  '0'!='00' so the WHERE clause returns FALSE and
  the count is zero.</p>

  <p>There is a page on <a href="datatypes.html">datatypes in SQLite
  version 2.8</a>
  and another for <a href="datatype3.html">version 3.0</a>
  that explains this concept further.</p>
}

faq {
  Why doesn't SQLite allow me to use '0' and '0.0' as the primary
  key on two different rows of the same table?
} {

</pre></blockquote>
}

faq {
  Are there any known size limits to SQLite databases?
} {
  <p>As of version 2.7.4, 
  SQLite can handle databases up to 2<sup>41</sup> bytes (2 terabytes)
  in size on both Windows and Unix.  Older version of SQLite
  were limited to databases of 2<sup>31</sup> bytes (2 gigabytes).</p>

  <p>SQLite version 2.8 limits the amount of data in one row to 


  1 megabyte.  SQLite version 3.0 has no limit on the amount of

  data that can be stored in a single row.


  </p>





  <p>The names of tables, indices, view, triggers, and columns can be
  as long as desired.  However, the names of SQL functions (as created
  by the <a href="c_interface.html#cfunc">sqlite_create_function()</a> API)
  may not exceed 255 characters in length.</p>
}

faq {
  What is the maximum size of a VARCHAR in SQLite?
} {
  <p>SQLite does not enforce datatype constraints.
  A VARCHAR column can hold as much data as you care to put it in.</p>







}

faq {
  Does SQLite support a BLOB type?
} {


  <p>SQLite version 3.0 lets you puts BLOB data into any column, even

  columns that are declared to hold some other type.</p>

  <p>SQLite version 2.8 would hold store text data without embedded
  '\000' characters.  If you need to store BLOB data in SQLite version


  2.8 you'll want to encode that data first.
  There is a source file named 
  "<b>src/encode.c</b>" in the SQLite version 2.8 distribution that contains
  implementations of functions named "<b>sqlite_encode_binary()</b>
  and <b>sqlite_decode_binary()</b> that can be used for converting
  binary data to ASCII and back again, if you like.</p>

 
}

faq {
  How do I add or delete columns from an existing table in SQLite.
} {
  <p>SQLite does yes not support the "ALTER TABLE" SQL command.  If you
  what to change the structure of a table, you have to recreate the
  table.  You can save existing data to a temporary table, drop the
  old table, create the new table, then copy the data back in from
  the temporary table.</p>

  <p>For example, suppose you have a table named "t1" with columns
  names "a", "b", and "c" and that you want to delete column "c" from

faq {
  Can I use SQLite in my commerical product without paying royalties?
} {
  <p>Yes.  SQLite is in the public domain.  No claim of ownership is made
  to any part of the code.  You can do anything you want with it.</p>
}

faq {
  How do I use a string literal that contains an embedded single-quote (')
  character?
} {
  <p>The SQL standard specifies that single-quotes in strings are escaped
  by putting two single quotes in a row.  SQL works like the Pascal programming
  language in the regard.  SQLite follows this standard.  Example:
  </p>

  <blockquote><pre>
    INSERT INTO xyz VALUES('5 O''clock');
  </pre></blockquote>
}

# End of questions and answers.
#############

puts {<h2>Frequently Asked Questions</h2>}

# puts {<DL COMPACT>}

SQLite is a small C library that implements a 
self-contained, embeddable,
zero-configuration SQL database engine.
Features include:
</p>

<p><ul>
<li>Transaction are atomic, consistent, isolated, and durable (ACID)
    even after system crashes and power failures.
<li>Zero-configuration - no setup or administration needed.</li>
<li>Implements most of SQL92.
    (<a href="omitted.html">Features not supported</a>)</li>
<li>A complete database is stored in a single disk file.</li>
<li>Database files can be freely shared between machines with
    different byte orders.</li>
<li>Supports databases up to 2 terabytes (2<sup>41</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="c_interface.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 90% test coverage.</li>

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 {2004-Sep-18} {Version 3.0.7} {






  Version 3.0 has now been in use by multiple projects for several
  months with no major difficulties.   We consider it stable and




  ready for production use. 






}


newsitem {2004-Jly-22} {Version 2.8.15} {
  SQLite version 2.8.15 is a maintenance release for the version 2.8
  series.  Version 2.8 continues to be maintained with bug fixes, but
  no new features will be added to version 2.8.  All the changes in
  this release are minor.  If you are not having problems, there is
  there is no reason to upgrade.
}
  

puts {
<p align="right"><a href="oldnews.html">Old news...</a></p>
</td></tr></table>
}
footer {$Id: index.tcl,v 1.96 2004/09/18 18:00:24 drh Exp $}

#!/usr/bin/tclsh
source common.tcl
header {SQLite Older News}

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 {2004-Sep-02} {Version 3.0.6 (beta)} {
  Because of some important changes to sqlite3_step(),
  we have decided to
  do an additional beta release prior to the first "stable" release.
  If no serious problems are discovered in this version, we will
  release version 3.0 "stable" in about a week.
}


newsitem {2004-Aug-29} {Version 3.0.5 (beta)} {
  The fourth beta release of SQLite version 3.0 is now available.
  The next release is expected to be called "stable".
}


newsitem {2004-Aug-08} {Version 3.0.4 (beta)} {
  The third beta release of SQLite version 3.0 is now available.
  This new beta fixes several bugs including a database corruption
  problem that can occur when doing a DELETE while a SELECT is pending.
  Expect at least one more beta before version 3.0 goes final.
}

newsitem {2004-Jly-22} {Version 3.0.3 (beta)} {
  The second beta release of SQLite version 3.0 is now available.
  This new beta fixes many bugs and adds support for databases with
  varying page sizes.  The next 3.0 release will probably be called
  a final or stable release.

  changes to both the C-language API and the underlying file format
  that will enable SQLite to better support internationalization.
  The first beta is schedule for release on 2004-July-01.

  Plans are to continue to support SQLite version 2.8 with
  bug fixes.  But all new development will occur in version 3.0.
}
footer {$Id: oldnews.tcl,v 1.5 2004/09/18 18:00:24 drh Exp $}

#
# Run this TCL script to generate HTML for the quickstart.html file.
#
set rcsid {$Id: quickstart.tcl,v 1.5 2004/09/18 18:00:24 drh Exp $}
source common.tcl



header {SQLite In 5 Minutes Or Less}

puts {
<p>Here is what you do to start experimenting with SQLite without having
to do a lot of tedious reading and configuration:</p>

<h2>Download The Code</h2>

<ul>
<li><p>Get a copy of the prebuilt binaries for your machine, or get a copy
of the sources and compile them yourself.  Visit
the <a href="download.html">download</a> page for more information.</p></li>
</ul>

<h2>Create A New Database</h2>

<ul>
<li><p>At a shell or DOS prompt, enter: "<b>sqlite3 test.db</b>".  This will
create a new database named "test.db".  (You can use a different name if
you like.)</p></li>
<li><p>Enter SQL commands at the prompt to create and populate the
new database.</p></li>
</ul>

<h2>Write Programs That Use SQLite</h2>

<ul>
<li><p>Below is a simple TCL program that demonstrates how to use
the TCL interface to SQLite.  The program executes the SQL statements
given as the second argument on the database defined by the first
argument.  The commands to watch for are the <b>sqlite3</b> command
on line 7 which opens an SQLite database and creates
a new TCL command named "<b>db</b>" to access that database, the
invocation of the <b>db</b> command on line 8 to execute
SQL commands against the database, and the closing of the database connection
on the last line of the script.</p>

<blockquote><pre>
#!/usr/bin/tclsh
if {$argc!=2} {
  puts stderr "Usage: %s DATABASE SQL-STATEMENT"
  exit 1
}
load /usr/lib/tclsqlite3.so Sqlite
<b>sqlite3</b> db [lindex $argv 0]
<b>db</b> eval [lindex $argv 1] x {
  foreach v $x(*) {
    puts "$v = $x($v)"
  }
  puts ""
}
<b>db</b> close
</pre></blockquote>
</li>

<li><p>Below is a simple C program that demonstrates how to use
the C/C++ interface to SQLite.  The name of a database is given by
the first argument and the second argument is one or more SQL statements
to execute against the database.  The function calls to pay attention
to here are the call to <b>sqlite3_open()</b> on line 22 which opens
the database, <b>sqlite3_exec()</b> on line 27 that executes SQL
commands against the database, and <b>sqlite3_close()</b> on line 31
that closes the database connection.</p>

<blockquote><pre>
#include &lt;stdio.h&gt;
#include &lt;sqlite3.h&gt;

static int callback(void *NotUsed, int argc, char **argv, char **azColName){
  int i;
  for(i=0; i&lt;argc; i++){
    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
  }
  printf("\n");
  return 0;
}

int main(int argc, char **argv){
  sqlite3 *db;
  char *zErrMsg = 0;
  int rc;

  if( argc!=3 ){
    fprintf(stderr, "Usage: %s DATABASE SQL-STATEMENT\n", argv[0]);
    exit(1);
  }
  rc = <b>sqlite3_open</b>(argv[1], &db);
  if( rc ){
    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
    sqlite3_close(db);
    exit(1);
  }
  rc = <b>sqlite3_exec</b>(db, argv[2], callback, 0, &zErrMsg);
  if( rc!=SQLITE_OK ){
    fprintf(stderr, "SQL error: %s\n", zErrMsg);
  }
  <b>sqlite3_close</b>(db);
  return 0;
}
</pre></blockquote>
</li>
</ul>
}
footer {$Id: quickstart.tcl,v 1.5 2004/09/18 18:00:24 drh Exp $}