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Fix for bug #15: Add the sqlite_changes() API function for retrieving the

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number of rows that changed in the previous operation. (CVS 526)

FossilOrigin-Name: 6e71493b9dc77d508c3ce90562766789e87e6d80
This commit is contained in:
drh
2002-04-12 10:08:59 +00:00
parent b04a5d8768
commit c8d30ac109
15 changed files with 172 additions and 59 deletions
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20
www/c_interface.tcl
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@ -1,7 +1,7 @@
#
# Run this Tcl script to generate the sqlite.html file.
#
set rcsid {$Id: c_interface.tcl,v 1.25 2002/03/04 02:26:17 drh Exp $}
set rcsid {$Id: c_interface.tcl,v 1.26 2002/04/12 10:09:00 drh Exp $}
puts {<html>
<head>
@ -307,6 +307,8 @@ useful interfaces. These extended routines are as follows:
<blockquote><pre>
int sqlite_last_insert_rowid(sqlite*);
int sqlite_changes(sqlite*);
int sqlite_get_table(
sqlite*,
char *sql,
@ -389,6 +391,22 @@ the key is automatically generated. You can find the value of the key
for the most recent INSERT statement using the
<b>sqlite_last_insert_rowid()</b> API function.</p>
<h2>The number of rows that changed</h2>
<p>The <b>sqlite_changes()</b> API function returns the number of rows
that were inserted, deleted, or modified during the most recent
<b>sqlite_exec()</b> call. The number reported includes any changes
that were later undo by a ROLLBACK or ABORT. But rows that are
deleted because of a DROP TABLE are <em>not</em> counted.</p>
<p>SQLite implements the command "<b>DELETE FROM table</b>" (without
a WHERE clause) by dropping the table then recreating it.
This is much faster than deleting the elements of the table individually.
But it also means that the value returned from <b>sqlite_changes()</b>
will be zero regardless of the number of elements that were originally
in the table. If an accurate count of the number of elements deleted
is necessary, use "<b>DELETE FROM table WHERE 1</b>" instead.</p>
<h2>Querying without using a callback function</h2>
<p>The <b>sqlite_get_table()</b> function is a wrapper around