perl/libs/libdb.pm

##    --------------------------------------------------------------------------------
##    $Id: libdb.pm,v 1.7 2002/12/01 22:13:17 joko Exp $
##    --------------------------------------------------------------------------------
##    $Log: libdb.pm,v $
##    Revision 1.7  2002/12/01 22:13:17  joko
##    + minor bugfix?
##
##    Revision 1.6  2002/11/29 04:53:39  joko
##    + hash2Sql now knows about SQL_SELECT
##
##    Revision 1.5  2002/11/17 07:18:38  joko
##    + small modification in hash2sql
##
##    Revision 1.4  2002/10/16 22:36:42  joko
##    + sub testDbServer
##
##    Revision 1.3  2002/07/27 00:28:20  cvsjoko
##    bugfixes
##
##    Revision 1.2  2002/07/20 11:09:58  cvsjoko
##    + bugfixes
##    + dont' print sql-errors
##
##    Revision 1.1  2002/07/19 18:14:03  cvsjoko
##    no message
##
##
##    --------------------------------------------------------------------------------

package libdb;

use strict;
use warnings;

require Exporter;
our @ISA = qw( Exporter );
our @EXPORT_OK = qw( 
                              testDsn hash2Sql 
                              SQL_INSERT SQL_UPDATE
                              connectTarget disconnectTarget sendSql
                              dbNow
                              getDbNameByDsn sqlDbAction createSqlDb dropSqlDb
                              quotesql
                              testDsnForTables testDbServer
                              );


use libp qw( croak );
use DBI;
use Data::Dumper;

use constant SQL_INSERT => 10;
use constant SQL_UPDATE => 11;
use constant SQL_SELECT => 12;

my $dbmeta_ref_cache;

sub testDsn {
  my $dsn = shift;
  my $result;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    $dbh->disconnect();
    return 1;
  }
}

sub testDbServer {
  my $dsn = shift;
  $dsn =~ s/database=(\w+)//;
  
  #print "testDbServer: $dsn", "\n";
  
  my $result;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    $dbh->disconnect();
    return 1;
  }
}


# TODO: handle usage of "$crit" in an abstract way somehow
sub hash2Sql {
  
  my $table = shift;
  my $hash = shift;
  my $mode = shift;
  my $crit = shift;
  
  my $sql;
  $mode = SQL_SELECT if ($mode eq 'SQL_SELECT' || $mode eq 'SELECT');
  $mode = SQL_INSERT if ($mode eq 'SQL_INSERT' || $mode eq 'INSERT');
  $mode = SQL_UPDATE if ($mode eq 'SQL_UPDATE' || $mode eq 'UPDATE');

  if ($mode == SQL_SELECT) {
    $sql = "SELECT #fields# FROM $table WHERE $crit";
  } elsif ($mode == SQL_INSERT) {
    $sql = "INSERT INTO $table (#fields#) VALUES (#values#)";
  } elsif ($mode == SQL_UPDATE) {
    $sql = "UPDATE $table SET #fields-values# WHERE $crit";
  }
  
  my (@fields, @values);
  foreach my $key (keys %{$hash}) {
    push @fields, $key;
    push @values, $hash->{$key};
  }
  # quote each element
  map { if (defined $_) { $_ = "'$_'" } else { $_ = "null" } } @values;
  
  my $fields = join(', ', @fields);
  my $values = join(', ', @values);
  my $fields_values = '';
  my $fc = 0;
  foreach (@fields) {
    $fields_values .= $_ . '=' . $values[$fc] . ', ';
    $fc++;
  }
  $fields_values = substr($fields_values, 0, -2);
  
  $sql =~ s/#fields#/$fields/;
  $sql =~ s/#values#/$values/;
  $sql =~ s/#fields-values#/$fields_values/;
  
  return $sql;
}

sub patch_dbmeta {
  
  my $dbmeta = shift;

  if ($dbmeta =~ m/^dbi:/) {
    $dbmeta = {
      dsn => $dbmeta,
      trace_level => 0,
      trace_file => undef,
    };
  }
  
  return $dbmeta;
  
}

sub connectTarget {
  my $dbmeta = shift;
  croak "please supply a dsn or a \"dbmeta\"-hash" if (!$dbmeta);
  $dbmeta = patch_dbmeta($dbmeta);
  if (!$dbmeta->{connected}) {
    if ($dbmeta->{dbh} = DBI->connect($dbmeta->{dsn}, '', '', { PrintError => 0 } )) {
      $dbmeta->{dbh}->trace($dbmeta->{trace_level}, $dbmeta->{trace_file});
      $dbmeta->{dbh}->{PrintError} = 0;
      $dbmeta->{connected} = 1;
      $dbmeta_ref_cache = $dbmeta;
      return 1;
    }
  }
}

sub disconnectTarget {
  #my $dbmeta = shift;
  #print "disc\n";
  #croak "please supply a \"dbmeta\"-hash" if (!$dbmeta);
  #$dbmeta = patch_dbmeta($dbmeta);
  #$dbmeta->{dbh} && $dbmeta->{dbh}->disconnect();
  my $dbmeta = $dbmeta_ref_cache;
  #print Dumper($dbmeta);
  #$dbmeta->{dbh} && $dbmeta->{dbh}->disconnect();
  $dbmeta->{dbh}->disconnect();
  undef($dbmeta->{dbh});
  undef($dbmeta);
  undef($dbmeta_ref_cache);
}

sub sendSql {
  my $sql = shift;
  my $dbmeta_ref = shift;
  if (!$dbmeta_ref) { 
    $dbmeta_ref = $dbmeta_ref_cache;
  }
  #print "sql: $sql", "\n";
  if (!$dbmeta_ref->{connected}) {
    print "not connected!", "\n";
    return 0;
  }
  if (my $result = $dbmeta_ref->{dbh}->prepare($sql)) {
    #if ($result->execute()) {
      $result->execute();
      return $result;
    #}
  }
}

sub dbNow {
  #my $now_string = strftime "%a %b %e %H:%M:%S %Y", localtime;
  my $now_string = strftime("%Y-%m-%d %H:%M:%S", localtime);
  return $now_string;
}


sub getDbNameByDsn {
  my $dsn = shift;
  $dsn =~ m/database=(.+?);/;
  my $database_name = $1;
  return $database_name;
}

sub sqlDbAction {
  my $dsn = shift;
  $dsn =~ s/database=.+?;//;
  my $sql = shift;
  my $dbmeta = {
    dsn => $dsn,
    trace_level => 1,
    trace_file => 'dbitrace',
  };
  my $bool_ok;
  if (connectTarget($dbmeta)) {
    sendSql($sql);
    #print "state: ", $dbmeta->{dbh}->state, "\n";
    #print "err    ", $dbmeta->{dbh}->err, "\n";
    #$bool_ok = ($dbmeta->{dbh} && $dbmeta->{dbh}->state && !$dbmeta->{dbh}->err);
    $bool_ok = ($dbmeta->{dbh} && !$dbmeta->{dbh}->err);
    disconnectTarget($dbmeta);
  }
  return $bool_ok;
}

sub createSqlDb {
  my $dsn = shift;
  my $dbname = getDbNameByDsn($dsn);
  print "  - creating rdbms-database $dbname ($dsn) ...";
  my $sql;
  $sql = "CREATE DATABASE $dbname;";
  if ( sqlDbAction($dsn, $sql) ) {
    print "ok", "\n";
    return 1;
  } else {
    print "failed", "\n";
    return 0;
  }
}

sub dropSqlDb {
  my $dsn = shift;
  my $dbname = getDbNameByDsn($dsn);
  print "  - dropping database $dbname", "\n";
  my $sql;
  $sql = "DROP DATABASE $dbname;";
  sqlDbAction($dsn, $sql);
}

sub quotesql {
  my $string = shift;
  if ($string) {
    $string =~ s/'/\\'/g;
  }
  return $string;
}

sub testDsnForTables {
  my $dsn = shift;
  connectTarget($dsn);
  my $result = sendSql('SHOW TABLES;');
  my $bool_tablesHere = $result->fetchrow_hashref();
  $result->finish();
  disconnectTarget($dsn);
  return 1 if ($bool_tablesHere);
}

1;
1	cvsjoko	1.1	## --------------------------------------------------------------------------------
2	joko	1.8	## $Id: libdb.pm,v 1.7 2002/12/01 22:13:17 joko Exp $
3	cvsjoko	1.1	## --------------------------------------------------------------------------------
4	cvsjoko	1.2	## $Log: libdb.pm,v $
5	joko	1.8	## Revision 1.7 2002/12/01 22:13:17 joko
6			## + minor bugfix?
7			##
8	joko	1.7	## Revision 1.6 2002/11/29 04:53:39 joko
9			## + hash2Sql now knows about SQL_SELECT
10			##
11	joko	1.6	## Revision 1.5 2002/11/17 07:18:38 joko
12			## + small modification in hash2sql
13			##
14	joko	1.5	## Revision 1.4 2002/10/16 22:36:42 joko
15			## + sub testDbServer
16			##
17	joko	1.4	## Revision 1.3 2002/07/27 00:28:20 cvsjoko
18			## bugfixes
19			##
20	cvsjoko	1.3	## Revision 1.2 2002/07/20 11:09:58 cvsjoko
21			## + bugfixes
22			## + dont' print sql-errors
23			##
24	cvsjoko	1.2	## Revision 1.1 2002/07/19 18:14:03 cvsjoko
25			## no message
26			##
27	cvsjoko	1.1	##
28			## --------------------------------------------------------------------------------
29
30			package libdb;
31
32			use strict;
33			use warnings;
34
35			require Exporter;
36			our @ISA = qw( Exporter );
37	joko	1.6	our @EXPORT_OK = qw(
38	cvsjoko	1.1	testDsn hash2Sql
39			SQL_INSERT SQL_UPDATE
40			connectTarget disconnectTarget sendSql
41			dbNow
42			getDbNameByDsn sqlDbAction createSqlDb dropSqlDb
43			quotesql
44	joko	1.4	testDsnForTables testDbServer
45	cvsjoko	1.1	);
46
47	joko	1.6
48			use libp qw( croak );
49			use DBI;
50	joko	1.8	use Data::Dumper;
51	joko	1.6
52	cvsjoko	1.1	use constant SQL_INSERT => 10;
53			use constant SQL_UPDATE => 11;
54	joko	1.6	use constant SQL_SELECT => 12;
55	cvsjoko	1.1
56			my $dbmeta_ref_cache;
57
58			sub testDsn {
59			my $dsn = shift;
60			my $result;
61			if ( my $dbh = DBI->connect($dsn, '', '', {
62			PrintError => 0,
63			} ) ) {
64			$dbh->disconnect();
65			return 1;
66			}
67			}
68
69	joko	1.4	sub testDbServer {
70			my $dsn = shift;
71			$dsn =~ s/database=(\w+)//;
72
73			#print "testDbServer: $dsn", "\n";
74
75			my $result;
76			if ( my $dbh = DBI->connect($dsn, '', '', {
77			PrintError => 0,
78			} ) ) {
79			$dbh->disconnect();
80			return 1;
81			}
82			}
83
84	joko	1.6
85			# TODO: handle usage of "$crit" in an abstract way somehow
86	cvsjoko	1.1	sub hash2Sql {
87
88			my $table = shift;
89			my $hash = shift;
90			my $mode = shift;
91			my $crit = shift;
92
93			my $sql;
94	joko	1.6	$mode = SQL_SELECT if ($mode eq 'SQL_SELECT' \|\| $mode eq 'SELECT');
95			$mode = SQL_INSERT if ($mode eq 'SQL_INSERT' \|\| $mode eq 'INSERT');
96			$mode = SQL_UPDATE if ($mode eq 'SQL_UPDATE' \|\| $mode eq 'UPDATE');
97
98			if ($mode == SQL_SELECT) {
99			$sql = "SELECT #fields# FROM $table WHERE $crit";
100			} elsif ($mode == SQL_INSERT) {
101			$sql = "INSERT INTO $table (#fields#) VALUES (#values#)";
102			} elsif ($mode == SQL_UPDATE) {
103			$sql = "UPDATE $table SET #fields-values# WHERE $crit";
104	cvsjoko	1.1	}
105
106			my (@fields, @values);
107			foreach my $key (keys %{$hash}) {
108			push @fields, $key;
109			push @values, $hash->{$key};
110			}
111			# quote each element
112			map { if (defined $_) { $_ = "'$_'" } else { $_ = "null" } } @values;
113
114			my $fields = join(', ', @fields);
115			my $values = join(', ', @values);
116			my $fields_values = '';
117			my $fc = 0;
118			foreach (@fields) {
119			$fields_values .= $_ . '=' . $values[$fc] . ', ';
120			$fc++;
121			}
122			$fields_values = substr($fields_values, 0, -2);
123
124			$sql =~ s/#fields#/$fields/;
125			$sql =~ s/#values#/$values/;
126			$sql =~ s/#fields-values#/$fields_values/;
127
128			return $sql;
129			}
130
131			sub patch_dbmeta {
132
133			my $dbmeta = shift;
134
135			if ($dbmeta =~ m/^dbi:/) {
136			$dbmeta = {
137			dsn => $dbmeta,
138			trace_level => 0,
139			trace_file => undef,
140			};
141			}
142
143			return $dbmeta;
144
145			}
146
147			sub connectTarget {
148			my $dbmeta = shift;
149			croak "please supply a dsn or a \"dbmeta\"-hash" if (!$dbmeta);
150			$dbmeta = patch_dbmeta($dbmeta);
151			if (!$dbmeta->{connected}) {
152	cvsjoko	1.2	if ($dbmeta->{dbh} = DBI->connect($dbmeta->{dsn}, '', '', { PrintError => 0 } )) {
153	cvsjoko	1.1	$dbmeta->{dbh}->trace($dbmeta->{trace_level}, $dbmeta->{trace_file});
154			$dbmeta->{dbh}->{PrintError} = 0;
155			$dbmeta->{connected} = 1;
156			$dbmeta_ref_cache = $dbmeta;
157	cvsjoko	1.2	return 1;
158	cvsjoko	1.1	}
159			}
160			}
161
162			sub disconnectTarget {
163			#my $dbmeta = shift;
164	joko	1.8	#print "disc\n";
165	cvsjoko	1.1	#croak "please supply a \"dbmeta\"-hash" if (!$dbmeta);
166			#$dbmeta = patch_dbmeta($dbmeta);
167			#$dbmeta->{dbh} && $dbmeta->{dbh}->disconnect();
168			my $dbmeta = $dbmeta_ref_cache;
169	joko	1.8	#print Dumper($dbmeta);
170			#$dbmeta->{dbh} && $dbmeta->{dbh}->disconnect();
171			$dbmeta->{dbh}->disconnect();
172	joko	1.7	undef($dbmeta->{dbh});
173	joko	1.8	undef($dbmeta);
174			undef($dbmeta_ref_cache);
175	cvsjoko	1.1	}
176
177			sub sendSql {
178			my $sql = shift;
179			my $dbmeta_ref = shift;
180			if (!$dbmeta_ref) {
181			$dbmeta_ref = $dbmeta_ref_cache;
182			}
183			#print "sql: $sql", "\n";
184			if (!$dbmeta_ref->{connected}) {
185			print "not connected!", "\n";
186			return 0;
187			}
188			if (my $result = $dbmeta_ref->{dbh}->prepare($sql)) {
189	joko	1.4	#if ($result->execute()) {
190			$result->execute();
191	cvsjoko	1.1	return $result;
192	joko	1.4	#}
193	cvsjoko	1.1	}
194			}
195
196			sub dbNow {
197			#my $now_string = strftime "%a %b %e %H:%M:%S %Y", localtime;
198			my $now_string = strftime("%Y-%m-%d %H:%M:%S", localtime);
199			return $now_string;
200			}
201
202
203			sub getDbNameByDsn {
204			my $dsn = shift;
205			$dsn =~ m/database=(.+?);/;
206			my $database_name = $1;
207			return $database_name;
208			}
209
210			sub sqlDbAction {
211			my $dsn = shift;
212			$dsn =~ s/database=.+?;//;
213			my $sql = shift;
214			my $dbmeta = {
215			dsn => $dsn,
216			trace_level => 1,
217			trace_file => 'dbitrace',
218			};
219	cvsjoko	1.2	my $bool_ok;
220			if (connectTarget($dbmeta)) {
221			sendSql($sql);
222	cvsjoko	1.3	#print "state: ", $dbmeta->{dbh}->state, "\n";
223			#print "err ", $dbmeta->{dbh}->err, "\n";
224			#$bool_ok = ($dbmeta->{dbh} && $dbmeta->{dbh}->state && !$dbmeta->{dbh}->err);
225			$bool_ok = ($dbmeta->{dbh} && !$dbmeta->{dbh}->err);
226	cvsjoko	1.2	disconnectTarget($dbmeta);
227			}
228			return $bool_ok;
229	cvsjoko	1.1	}
230
231			sub createSqlDb {
232			my $dsn = shift;
233			my $dbname = getDbNameByDsn($dsn);
234	cvsjoko	1.2	print " - creating rdbms-database $dbname ($dsn) ...";
235	cvsjoko	1.1	my $sql;
236			$sql = "CREATE DATABASE $dbname;";
237	cvsjoko	1.2	if ( sqlDbAction($dsn, $sql) ) {
238	cvsjoko	1.3	print "ok", "\n";
239			return 1;
240	cvsjoko	1.2	} else {
241	cvsjoko	1.3	print "failed", "\n";
242			return 0;
243	cvsjoko	1.2	}
244	cvsjoko	1.1	}
245	cvsjoko	1.2
246	cvsjoko	1.1	sub dropSqlDb {
247			my $dsn = shift;
248			my $dbname = getDbNameByDsn($dsn);
249			print " - dropping database $dbname", "\n";
250			my $sql;
251			$sql = "DROP DATABASE $dbname;";
252			sqlDbAction($dsn, $sql);
253			}
254
255			sub quotesql {
256			my $string = shift;
257	joko	1.4	if ($string) {
258			$string =~ s/'/\\'/g;
259			}
260	cvsjoko	1.1	return $string;
261			}
262
263			sub testDsnForTables {
264			my $dsn = shift;
265			connectTarget($dsn);
266			my $result = sendSql('SHOW TABLES;');
267			my $bool_tablesHere = $result->fetchrow_hashref();
268			$result->finish();
269			disconnectTarget($dsn);
270			return 1 if ($bool_tablesHere);
271			}
272
273	cvsjoko	1.3	1;
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