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Overview
| Comment: | More documentation updates (CVS 295) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
f65df59e554c281ad1efa830f13f8748 |
| User & Date: | drh 2001-10-31 15:44:47 |
Context
|
2001-11-01
| ||
| 13:52 | Comment changes only. (CVS 296) (check-in: b2cb118f user: drh tags: trunk) | |
|
2001-10-31
| ||
| 15:44 | More documentation updates (CVS 295) (check-in: f65df59e user: drh tags: trunk) | |
|
2001-10-25
| ||
| 20:37 | Make lemon 64-bit clean (CVS 294) (check-in: 475e2fed user: drh tags: trunk) | |
Changes
Changes to www/c_interface.tcl.
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#
# Run this Tcl script to generate the sqlite.html file.
#
set rcsid {$Id: c_interface.tcl,v 1.18 2001/10/19 16:44:58 drh Exp $}
puts {<html>
<head>
<title>The C language interface to the SQLite library</title>
</head>
<body bgcolor=white>
<h1 align=center>
................................................................................
</p></dd>
<dt>SQLITE_LOCKED</dt>
<dd><p>This return code is similar to SQLITE_BUSY in that it indicates
that the database is locked. But the source of the lock is a recursive
call to <b>sqlite_exec()</b>. This return can only occur if you attempt
to invoke sqlite_exec() from within a callback routine of a query
from a prior invocation of sqlite_exec(). Recursive calls to
sqlite_exec() are allowed as long as no more they all read-only or do
not attempt to write the same table.
</p></dd>
<dt>SQLITE_NOMEM</dt>
<dd><p>This value is returned if a call to <b>malloc()</b> fails.
</p></dd>
<dt>SQLITE_READONLY</dt>
<dd><p>This return code indicates that an attempt was made to write to
................................................................................
result[2] = "host"<br>
</blockquote>
<p>Memory to hold the information returned by <b>sqlite_get_table()</b>
is obtained from malloc(). But the calling function should not try
to free this information directly. Instead, pass the complete table
to <b>sqlite_free_table()</b> when the table is no longer needed.
It is safe to call <b>sqlite_free_table()</b> will a NULL pointer such
as would be returned if the result set is empty.</p>
<p>The <b>sqlite_get_table()</b> routine returns the same integer
result code as <b>sqlite_exec()</b>.</p>
<h2>Interrupting an SQLite operation</h2>
<p>The <b>sqlite_interrupt()</b> function can be called from a
different thread or from a signal handler to the current database
operation to exit at its first opportunity. When this happens,
the <b>sqlite_exec()</b> routine (or the equivalent) that started
the database operation will return SQLITE_INTERRUPT.</p>
<h2>Testing for a complete SQL statement</h2>
<p>The next interface routine to SQLite is a convenience function used
................................................................................
<b>sqlite_encoding</b> character string just tells you how the library
was compiled.</p>
<h2>Changing the libraries response to locked files</h2>
<p>The <b>sqlite_busy_handler()</b> procedure can be used to register
a busy callback with an open SQLite database. The busy callback will
be invoked whenever SQLite tries to open a locked that is locked.
The callback will typically do some other useful work, or perhaps sleep,
in order to give the lock a chance to clear. If the callback returns
non-zero, then SQLite tries again to open the database and the cycle
repeats. If the callback returns zero, then SQLite aborts the current
operation and returns SQLITE_BUSY.</p>
<p>The arguments to <b>sqlite_busy_handler()</b> are the opaque
|
| | | | | |
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#
# Run this Tcl script to generate the sqlite.html file.
#
set rcsid {$Id: c_interface.tcl,v 1.19 2001/10/31 15:44:47 drh Exp $}
puts {<html>
<head>
<title>The C language interface to the SQLite library</title>
</head>
<body bgcolor=white>
<h1 align=center>
................................................................................
</p></dd>
<dt>SQLITE_LOCKED</dt>
<dd><p>This return code is similar to SQLITE_BUSY in that it indicates
that the database is locked. But the source of the lock is a recursive
call to <b>sqlite_exec()</b>. This return can only occur if you attempt
to invoke sqlite_exec() from within a callback routine of a query
from a prior invocation of sqlite_exec(). Recursive calls to
sqlite_exec() are allowed as long as they do
not attempt to write the same table.
</p></dd>
<dt>SQLITE_NOMEM</dt>
<dd><p>This value is returned if a call to <b>malloc()</b> fails.
</p></dd>
<dt>SQLITE_READONLY</dt>
<dd><p>This return code indicates that an attempt was made to write to
................................................................................
result[2] = "host"<br>
</blockquote>
<p>Memory to hold the information returned by <b>sqlite_get_table()</b>
is obtained from malloc(). But the calling function should not try
to free this information directly. Instead, pass the complete table
to <b>sqlite_free_table()</b> when the table is no longer needed.
It is safe to call <b>sqlite_free_table()</b> with a NULL pointer such
as would be returned if the result set is empty.</p>
<p>The <b>sqlite_get_table()</b> routine returns the same integer
result code as <b>sqlite_exec()</b>.</p>
<h2>Interrupting an SQLite operation</h2>
<p>The <b>sqlite_interrupt()</b> function can be called from a
different thread or from a signal handler to cause the current database
operation to exit at its first opportunity. When this happens,
the <b>sqlite_exec()</b> routine (or the equivalent) that started
the database operation will return SQLITE_INTERRUPT.</p>
<h2>Testing for a complete SQL statement</h2>
<p>The next interface routine to SQLite is a convenience function used
................................................................................
<b>sqlite_encoding</b> character string just tells you how the library
was compiled.</p>
<h2>Changing the libraries response to locked files</h2>
<p>The <b>sqlite_busy_handler()</b> procedure can be used to register
a busy callback with an open SQLite database. The busy callback will
be invoked whenever SQLite tries to open a file that is locked.
The callback will typically do some other useful work, or perhaps sleep,
in order to give the lock a chance to clear. If the callback returns
non-zero, then SQLite tries again to open the database and the cycle
repeats. If the callback returns zero, then SQLite aborts the current
operation and returns SQLITE_BUSY.</p>
<p>The arguments to <b>sqlite_busy_handler()</b> are the opaque
|
Changes to www/changes.tcl.
12 13 14 15 16 17 18 19 20 21 22 23 24 25 |
}
proc chng {date desc} {
puts "<DT><B>$date</B></DT>"
puts "<DD><P><UL>$desc</UL></P></DD>"
}
chng {2001 Oct 21 (2.0.7)} {
<li>Any UTF-8 character or ISO8859 character can be used as part of
an identifier.</li>
<li>Patches from Christian Werner to improve ODBC compatibility and to
fix a bug in the round() function.</li>
<li>Plug some memory leaks that use to occur if malloc() failed.
|
> > > > |
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
}
proc chng {date desc} {
puts "<DT><B>$date</B></DT>"
puts "<DD><P><UL>$desc</UL></P></DD>"
}
chng {2001 Oct ?? (2.0.8)} {
<li>Documentation updates</li>
}
chng {2001 Oct 21 (2.0.7)} {
<li>Any UTF-8 character or ISO8859 character can be used as part of
an identifier.</li>
<li>Patches from Christian Werner to improve ODBC compatibility and to
fix a bug in the round() function.</li>
<li>Plug some memory leaks that use to occur if malloc() failed.
|
Changes to www/index.tcl.
1 2 3 4 5 6 7 8 9 10 11 ... 103 104 105 106 107 108 109 110 111 112 113 114 115 116 ... 118 119 120 121 122 123 124 125 126 127 128 129 130 131 |
#
# Run this TCL script to generate HTML for the index.html file.
#
set rcsid {$Id: index.tcl,v 1.44 2001/10/06 16:33:04 drh Exp $}
puts {<html>
<head><title>SQLite: An SQL Database Engine In A C Library</title></head>
<body bgcolor=white>
<h1 align=center>SQLite: An SQL Database Engine In A C Library</h1>
<p align=center>}
puts "This page was last modified on [lrange $rcsid 3 4] GMT<br>"
................................................................................
<li>A description of the <a href="opcode.html">virtual machine</a> that
SQLite uses to access the database.</li>
</ul>
</p>
<p>The SQLite source code is 35% comment. These comments are
another important source of information. </p>
}
puts {
<table align="right">
<tr><td align="center">
<a href="http://www.yahoogroups.com/subscribe/sqlite">
<img src="http://www.egroups.com/img/ui/join.gif" border=0 /><br />
................................................................................
</td></tr>
</table>
<a name="mailinglist" />
<h2>Mailing List</h2>
<p>A mailing list has been set up on yahooGroups for discussion of
SQLite design issues or for asking questions about SQLite.</p>
}
puts {<h2>Building From Source</h2>}
puts {
<p>To build sqlite under Unix, just unwrap the tarball, create a separate
build directory, run configure from the build directory and then
type "make". For example:</p>
|
| > > > > > > > > > > > > > > > > > > |
1 2 3 4 5 6 7 8 9 10 11 ... 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 ... 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 |
#
# Run this TCL script to generate HTML for the index.html file.
#
set rcsid {$Id: index.tcl,v 1.45 2001/10/31 15:44:47 drh Exp $}
puts {<html>
<head><title>SQLite: An SQL Database Engine In A C Library</title></head>
<body bgcolor=white>
<h1 align=center>SQLite: An SQL Database Engine In A C Library</h1>
<p align=center>}
puts "This page was last modified on [lrange $rcsid 3 4] GMT<br>"
................................................................................
<li>A description of the <a href="opcode.html">virtual machine</a> that
SQLite uses to access the database.</li>
</ul>
</p>
<p>The SQLite source code is 35% comment. These comments are
another important source of information. </p>
}
puts {
<table align="right">
<tr><td align="center">
<a href="http://www.yahoogroups.com/subscribe/sqlite">
<img src="http://www.egroups.com/img/ui/join.gif" border=0 /><br />
................................................................................
</td></tr>
</table>
<a name="mailinglist" />
<h2>Mailing List</h2>
<p>A mailing list has been set up on yahooGroups for discussion of
SQLite design issues or for asking questions about SQLite.</p>
}
puts {<h2>Professional Support and Custom Modifications</h2>}
puts {
<p>
If you would like professional support for SQLite
or if you want custom modifications to SQLite preformed by the
original author, these services are available for a modest fee.
For additional information contact:</p>
<blockquote>
D. Richard Hipp <br />
Hwaci - Applied Software Research <br />
704.948.4565 <br />
<a href="mailto:drh@hwaci.com">drh@hwaci.com</a>
</blockquote>
}
puts {<h2>Building From Source</h2>}
puts {
<p>To build sqlite under Unix, just unwrap the tarball, create a separate
build directory, run configure from the build directory and then
type "make". For example:</p>
|
Changes to www/speed.tcl.
1
2
3
4
5
6
7
8
9
10
11
...
286
287
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|
#
# Run this Tcl script to generate the speed.html file.
#
set rcsid {$Id: speed.tcl,v 1.3 2001/09/28 23:11:24 drh Exp $ }
puts {<html>
<head>
<title>Database Speed Comparison: SQLite versus PostgreSQL</title>
</head>
<body bgcolor=white>
<h1 align=center>
................................................................................
SQLite 1.0: real 0.03 user 0.00 sys 0.02
SQLite 2.0: real 3.12 user 0.02 sys 0.31
</pre></blockquote>
<p>
SQLite 2.0 is much slower at dropping tables. This may be because
both SQLite 1.0 and PostgreSQL can drop a table simply by unlinking
or renaming a file, since that both use one or more files per table.
SQLite 2.0, on the other hand, uses a single file for the entire
database, so dropping a table involves moving lots of page of that
file to the free-list, which takes time.
</p>
}
puts {
<p><hr /></p>
<p><a href="index.html"><img src="/goback.jpg" border=0 />
Back to the SQLite Home Page</a>
</p>
</body></html>}
|
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|
#
# Run this Tcl script to generate the speed.html file.
#
set rcsid {$Id: speed.tcl,v 1.4 2001/10/31 15:44:48 drh Exp $ }
puts {<html>
<head>
<title>Database Speed Comparison: SQLite versus PostgreSQL</title>
</head>
<body bgcolor=white>
<h1 align=center>
................................................................................
SQLite 1.0: real 0.03 user 0.00 sys 0.02
SQLite 2.0: real 3.12 user 0.02 sys 0.31
</pre></blockquote>
<p>
SQLite 2.0 is much slower at dropping tables. This may be because
both SQLite 1.0 and PostgreSQL can drop a table simply by unlinking
or renaming a file, since both store database tables in separate files.
SQLite 2.0, on the other hand, uses a single file for the entire
database, so dropping a table involves moving lots of page of that
file to the free-list, which takes time.
</p>
}
puts {
<p><hr /></p>
<p><a href="index.html"><img src="/goback.jpg" border=0 />
Back to the SQLite Home Page</a>
</p>
</body></html>}
|