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<?php |
<?php |
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// Database connection parameters |
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$db_server = "yourlibrary.edu"; |
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$db_user = "libdata"; |
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$db_password = "changEth1s"; |
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$db_name = "libdata"; |
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// Establish a connection to the database server or bail out. |
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$db_link = @mysql_connect ($db_server, $db_user, $db_password) |
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or die ( "ERROR: Could not connect to the database server." ); |
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// Switch to the selected database name or bail out. |
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$db_switch = @mysql_select_db ($db_name, $db_link ) |
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or die ( "ERROR: Could not connect to the database." ); |
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/********************************************************** |
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Function: mysql_tryquery($querystring) |
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Author: Paul Bramscher |
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Last Modified: 03.02.2004 |
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*********************************************************** |
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Incoming: |
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$querystring Typically an SQL statement, although |
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it can also be other mySQL directives |
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such as UNLOCK TABLES, etc. |
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*********************************************************** |
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Outgoing: |
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$db_resource mySQL resource identifier for the |
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(successful) query. |
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*********************************************************** |
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Purpose: |
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This function traps FALSE results for attempted mySQL |
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queries. If the $db_debug mode below is toggled on (1), |
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then additional error reporting is displayed. |
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**********************************************************/ |
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function mysql_tryquery($querystring) { |
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// Database debug mode |
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$db_debug = 0; |
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// Determine whether the query was successful |
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$db_resource = @mysql_query($querystring); |
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// Success. |
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if ($db_resource) { |
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return $db_resource; |
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} |
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// Handle errors |
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else { |
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// Display debugging information if activated. |
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if ($db_debug == 1) { |
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printf("<hr><b>DATABASE ERROR DEBUGGING</b><br><br>\n"); |
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printf("<b>mySQL error:</b><br>\n(#%s) %s<br><br>\n", |
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mysql_errno(), mysql_error()); |
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printf("<b>Attempted query:</b><br>\n%s<hr>\n", $querystring); |
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} |
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// Gracefully end the HTML stream |
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@mysql_query ("UNLOCK TABLES"); |
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die ("<br>The database is experiencing problems.</body></html>\n" ); |
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} |
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/****************************************************************/ |
} |
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/* constants */ |
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$DEBUG = 0; |
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/****************************************************************/ |
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/* database parameters */ |
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$db_nam = "libdata"; |
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$db_srv = "localhost"; |
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$db_usr = "libdata"; |
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$db_pwd = "libdatapw"; |
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/****************************************************************/ |
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/* establish a connection to the database or bailout */ |
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$con = mysql_connect ( $db_srv, $db_usr, $db_pwd ) |
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or die ( "ERROR: Could not connect to database server!" ); |
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$result = mysql_select_db ( $db_nam, $con ) |
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or die ( "ERROR: Could not connect to database!" ); |
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/****************************************************************/ |
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/* some useful functions */ |
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/* return an error message from a failed sql query */ |
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function sql_err ( $p_sql ) { |
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printf ( "ERROR: Query failed.<br>%s<br>%s: %s<br>\n", |
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$p_sql, mysql_errno(), mysql_error() ); |
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return 1; |
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} |
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/* finish off the html stream and die */ |
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function bailout() { |
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die ( "Bailing Out!<br>\n</body></html>\n" ); |
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} |
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?> |
?> |
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