database.php
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<?php
// This file adds a little bit of a wrapper over MySQL, and a little
// bit of convenience functionality.
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require_once 'localcfg.php';
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$GDebugSQL = false;
$GDebugSQLErrors = true;
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$dblink = NULL;
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function write_error($err)
{
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global $GDebugSQLErrors;
if ($GDebugSQLErrors)
print("\n\nERROR: $err\n\n");
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} // write_error
function write_debug($err)
{
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global $GDebugSQL;
if ($GDebugSQL)
print("\n\nDEBUG: $err\n\n");
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} // write_debug
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function get_dblink()
{
global $dblink;
if ($dblink == NULL)
{
global $dbhost, $dbuser, $dbpass, $dbname;
$dblink = mysql_connect($dbhost, $dbuser, $dbpass);
if (!$dblink)
{
$err = mysql_error();
write_error("Failed to open database link: ${err}.");
$dblink = NULL;
} // if
if (!mysql_select_db($dbname))
{
$err = mysql_error();
write_error("Failed to select database: ${err}.");
mysql_close($dblink);
$dblink = NULL;
} // if
} // if
return($dblink);
} // get_dblink
function close_dblink($link = NULL)
{
global $dblink;
$closeme = $link;
if ($closeme == NULL)
{
$closeme = $dblink;
$dblink = NULL;
} // if
if ($closeme != NULL)
mysql_close($closeme);
} // close_dblink
function db_escape_string($str)
{
return("'" . mysql_escape_string($str) . "'");
} // db_escape_string
function do_dbquery($sql, $link = NULL, $suppress_output = false)
{
if ($link == NULL)
$link = get_dblink();
if ($link == NULL)
return(false);
if (!$suppress_output)
write_debug("SQL query: [$sql;]");
$rc = mysql_query($sql, $link);
if ($rc == false)
{
if (!$suppress_output)
{
$err = mysql_error();
write_error("Problem in SELECT statement: {$err}");
} // if
return(false);
} // if
return($rc);
} // do_dbquery
function do_dbwrite($sql, $verb, $expected_rows = 1, $link = NULL)
{
if ($link == NULL)
$link = get_dblink();
if ($link == NULL)
return(false);
write_debug("SQL $verb: [$sql;]");
$rc = mysql_query($sql, $link);
if ($rc == false)
{
$err = mysql_error();
$upperverb = strtoupper($verb);
write_error("Problem in $upperverb statement: {$err}");
return(false);
} // if
$retval = mysql_affected_rows($link);
if (($expected_rows >= 0) and ($retval != $expected_rows))
{
$err = mysql_error();
write_error("Database $verb error: {$err}");
} // if
return($retval);
} // do_dbwrite
function do_dbinsert($sql, $expected_rows = 1, $link = NULL)
{
return(do_dbwrite($sql, 'insert', $expected_rows, $link));
} // do_dbinsert
function do_dbupdate($sql, $expected_rows = 1, $link = NULL)
{
return(do_dbwrite($sql, 'update', $expected_rows, $link));
} // do_dbupdate
function do_dbdelete($sql, $expected_rows = 1, $link = NULL)
{
return(do_dbwrite($sql, 'delete', $expected_rows, $link));
} // do_dbdelete
function db_num_rows($query)
{
return(mysql_num_rows($query));
} // db_num_rows
function db_reset_array($query)
{
return(mysql_data_seek($query, 0));
} // db_reset_array
function db_fetch_array($query)
{
return(mysql_fetch_assoc($query));
} // db_fetch_array
function db_free_result($query)
{
return(mysql_free_result($query));
} // db_free_result
?>