--- loncom/interface/lonmysql.pm	2003/03/21 16:04:42	1.12
+++ loncom/interface/lonmysql.pm	2003/12/27 01:44:49	1.17
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # MySQL utility functions
 #
-# $Id: lonmysql.pm,v 1.12 2003/03/21 16:04:42 matthew Exp $
+# $Id: lonmysql.pm,v 1.17 2003/12/27 01:44:49 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -32,6 +32,8 @@ package Apache::lonmysql;
 use strict;
 use DBI;
 use Apache::lonnet();
+use POSIX qw(strftime mktime);
+
 
 ######################################################################
 ######################################################################
@@ -348,6 +350,33 @@ sub connect_to_db {
 
 =pod
 
+=item &verify_sql_connection()
+
+Inputs: none.
+
+Returns: 0 (failure) or 1 (success)
+
+Checks to make sure the database can be connected to.  It does not
+initialize anything in the lonmysql package.
+
+=cut
+
+###############################
+sub verify_sql_connection {
+    my $connection;
+    if (! ($connection = DBI->connect("DBI:mysql:loncapa","www",
+                                      $Apache::lonnet::perlvar{'lonSqlAccess'},
+                                      { RaiseError=>0,PrintError=>0}))) {
+        return 0;
+    }
+    undef($connection);
+    return 1;
+}
+
+###############################
+
+=pod
+
 =item &disconnect_from_db()
 
 Inputs: none.
@@ -973,11 +1002,10 @@ sub remove_from_table {
     return undef if (!defined(&connect_to_db()));
     #
     $table_id = &translate_id($table_id);
-    my $command = 'DELETE FROM '.$table_id.' WHERE '.$dbh->quote($column).
+    my $command = 'DELETE FROM '.$table_id.' WHERE '.$column.
         " LIKE BINARY ".$dbh->quote($value);
     my $sth = $dbh->prepare($command); 
-    $sth->execute();
-    if ($sth->err) {
+    unless ($sth->execute()) {
         $errorstring = "ERROR on execution of ".$command."\n".$sth->errstr;
         return undef;
     }
@@ -986,6 +1014,67 @@ sub remove_from_table {
     return $rows;
 }
 
+###########################################
+
+=pod
+
+=item drop_table($table_id)
+
+Issues a 'drop table if exists' command
+
+=cut
+
+###########################################
+
+sub drop_table {
+    my ($table_id) = @_;
+    return undef if (!defined(&connect_to_db()));
+    #
+    $table_id = &translate_id($table_id);
+    my $command = 'DROP TABLE IF EXISTS '.$table_id;
+    my $sth = $dbh->prepare($command); 
+    $sth->execute();
+    if ($sth->err) {
+        $errorstring = "ERROR on execution of ".$command."\n".$sth->errstr;
+        return undef;
+    }
+    $debugstring = $command;
+    delete($Tables{$table_id}); # remove any knowledge of the table
+    return 1; # if we got here there was no error, so return a 'true' value
+}
+
+
+
+
+# ---------------------------- convert 'time' format into a datetime sql format
+sub sqltime {
+    my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) =
+	localtime(&unsqltime($_[0]));
+    $mon++; $year+=1900;
+    return "$year-$mon-$mday $hour:$min:$sec";
+}
+
+sub maketime {
+    my %th=@_;
+    return POSIX::mktime(($th{'seconds'},$th{'minutes'},$th{'hours'},
+                          $th{'day'},$th{'month'}-1,
+                          $th{'year'}-1900,0,0,$th{'dlsav'}));
+}
+
+
+#########################################
+#
+# Retro-fixing of un-backward-compatible time format
+
+sub unsqltime {
+    my $timestamp=shift;
+    if ($timestamp=~/^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/) {
+        $timestamp=&maketime('year'=>$1,'month'=>$2,'day'=>$3,
+                             'hours'=>$4,'minutes'=>$5,'seconds'=>$6);
+    }
+    return $timestamp;
+}
+
 
 1;