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50 | |
50 | |
51 | Connect to the database given by C<($dsn,$user,$pass)>, while using the |
51 | Connect to the database given by C<($dsn,$user,$pass)>, while using the |
52 | flags from C<$flags>. These are just the same arguments as given to |
52 | flags from C<$flags>. These are just the same arguments as given to |
53 | C<DBI->connect>. |
53 | C<DBI->connect>. |
54 | |
54 | |
55 | The database handle will be cached under the unique id C<$id>. If the same |
55 | The database handle will be cached under the unique id |
56 | id is requested later, the cached handle will be checked (using ping), and |
56 | C<$id|$dsn|$user|$pass>. If the same id is requested later, the |
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57 | cached handle will be checked (using ping), and the connection will |
57 | the connection will be re-established if necessary (be sure to prefix your |
58 | be re-established if necessary (be sure to prefix your application or |
58 | application or module name to the id to make it "more" unique. Things like |
59 | module name to the id to make it "more" unique. Things like __PACKAGE__ . |
59 | __PACKAGE__ . __LINE__ work fine as well). |
60 | __LINE__ work fine as well). |
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61 | |
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62 | The reason C<$id> is necessary is that you might specify special connect |
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63 | arguments or special flags, or you might want to configure your $DBH |
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64 | differently than maybe other applications requesting the same database |
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65 | connection. If none of this is becessary for your application you can |
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66 | leave $id empty (i.e. ""). |
60 | |
67 | |
61 | If specified, C<$connect> is a callback (e.g. a coderef) that will be |
68 | If specified, C<$connect> is a callback (e.g. a coderef) that will be |
62 | called each time a new connection is being established, with the new |
69 | called each time a new connection is being established, with the new |
63 | C<$dbh> as first argument. |
70 | C<$dbh> as first argument. |
64 | |
71 | |
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73 | my ($id, $dsn, $user, $pass, $flags, $connect) = @_; |
80 | my ($id, $dsn, $user, $pass, $flags, $connect) = @_; |
74 | # the following line is duplicated in PApp::SQL::Database::new |
81 | # the following line is duplicated in PApp::SQL::Database::new |
75 | $id = "$id\0$dsn\0$user\0$pass"; |
82 | $id = "$id\0$dsn\0$user\0$pass"; |
76 | unless ($dbcache{$id} && $dbcache{$id}->ping) { |
83 | unless ($dbcache{$id} && $dbcache{$id}->ping) { |
77 | #warn "connecting to ($dsn|$user|$pass|$flags)\n";#d# |
84 | #warn "connecting to ($dsn|$user|$pass|$flags)\n";#d# |
78 | # first, nuke our cache (sooory ;) |
85 | # first, nuke our statement cache (sooory ;) |
79 | cachesize cachesize 0; |
86 | cachesize cachesize 0; |
80 | # then connect anew |
87 | # then connect anew |
81 | $dbcache{$id} = |
88 | $dbcache{$id} = |
82 | eval { DBI->connect($dsn, $user, $pass, $flags) } |
89 | eval { DBI->connect($dsn, $user, $pass, $flags) } |
83 | || eval { DBI->connect($dsn, $user, $pass, $flags) } |
90 | || eval { DBI->connect($dsn, $user, $pass, $flags) } |
84 | || die "$DBI::errstr\n"; |
91 | || die "unable to connect to database $dsn: $DBI::errstr\n"; |
85 | $connect->($dbcache{$id}) if $connect; |
92 | $connect->($dbcache{$id}) if $connect; |
86 | } |
93 | } |
87 | $dbcache{$id}; |
94 | $dbcache{$id}; |
88 | } |
95 | } |
89 | |
96 | |
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188 | |
195 | |
189 | =cut |
196 | =cut |
190 | |
197 | |
191 | =item $lastid = sql_insertid $sth |
198 | =item $lastid = sql_insertid $sth |
192 | |
199 | |
193 | Returns the last automatically created key value (e.g. for mysql |
200 | Returns the last automatically created key value. It must be executed |
194 | AUTO_INCREMENT or sybase IDENTITY fields). It must be executed directly |
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195 | after executing the insert statement that created it. |
201 | directly after executing the insert statement that created it. This is |
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202 | what is actually returned for various databases. If your database is |
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203 | missing, please send me an e-mail on how to implement this ;) |
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204 | |
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205 | mysql: first C<AUTO_INCREMENT> column set to NULL |
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206 | postgres: C<oid> column (is there a way to get the last SERIAL?) |
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207 | sybase: C<IDENTITY> column of the last insert (slow) |
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208 | informix: C<SERIAL> or C<SERIAL8> column of the last insert |
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209 | |
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210 | Except for sybase, this does not require a server access. |
196 | |
211 | |
197 | =cut |
212 | =cut |
198 | |
213 | |
199 | sub sql_insertid($) { |
214 | sub sql_insertid($) { |
200 | my $sth = shift or die "sql_insertid requires a statement handle"; |
215 | my $sth = shift or die "sql_insertid requires a statement handle"; |
201 | my $dbh = $sth->{Database}; |
216 | my $dbh = $sth->{Database}; |
202 | my $driver = $dbh->{Driver}{Name}; |
217 | my $driver = $dbh->{Driver}{Name}; |
203 | |
218 | |
204 | $driver eq "mysql" and return $sth->{mysql_insertid}; |
219 | $driver eq "mysql" and return $sth->{mysql_insertid}; |
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220 | $driver eq "Pg" and return $sth->{pg_oid_status}; |
205 | $driver eq "Sybase" and return sql_fetch($dbh, 'SELECT @@IDENTITY'); |
221 | $driver eq "Sybase" and return sql_fetch($dbh, 'SELECT @@IDENTITY'); |
206 | $driver eq "Informix" and return $sth->{ix_sqlerrd}[1]; |
222 | $driver eq "Informix" and return $sth->{ix_sqlerrd}[1]; |
207 | |
223 | |
208 | die "sql_insertid does not spport the dbd driver '$driver', please see PApp::SQL::sql_insertid"; |
224 | die "sql_insertid does not spport the dbd driver '$driver', please see PApp::SQL::sql_insertid"; |
209 | } |
225 | } |
210 | |
226 | |
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… | |
225 | |
241 | |
226 | =cut |
242 | =cut |
227 | |
243 | |
228 | =item reinitialize [not exported] |
244 | =item reinitialize [not exported] |
229 | |
245 | |
230 | Clears any internal caches (statement cache, database handle cache). |
246 | Clears any internal caches (statement cache, database handle |
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247 | cache). Should be called after C<fork> and other accidents that invalidate |
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248 | database handles. |
231 | |
249 | |
232 | =cut |
250 | =cut |
233 | |
251 | |
234 | sub reinitialize { |
252 | sub reinitialize { |
235 | cachesize cachesize 0; |
253 | cachesize cachesize 0; |
… | |
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241 | |
259 | |
242 | =back |
260 | =back |
243 | |
261 | |
244 | =cut |
262 | =cut |
245 | |
263 | |
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264 | reinitialize; |
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265 | |
246 | package PApp::SQL::Database; |
266 | package PApp::SQL::Database; |
247 | |
267 | |
248 | =head2 THE DATABASE CLASS |
268 | =head2 THE DATABASE CLASS |
249 | |
269 | |
250 | Again (sigh) the problem of persistency. What do you do when you have to serialize on object |
270 | Again (sigh) the problem of persistency. What do you do when you have to serialize on object |
… | |
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301 | |
321 | |
302 | =cut |
322 | =cut |
303 | |
323 | |
304 | sub dsn($) { |
324 | sub dsn($) { |
305 | my $self = shift; |
325 | my $self = shift; |
306 | $self->[1][1]; |
326 | (split /\x00/, $self->[0])[1]; |
307 | } |
327 | } |
308 | |
328 | |
309 | =back |
329 | =back |
310 | |
330 | |
311 | =cut |
331 | =cut |
312 | |
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313 | reinitialize; |
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314 | |
332 | |
315 | 1; |
333 | 1; |
316 | |
334 | |
317 | =head1 BUGS |
335 | =head1 BUGS |
318 | |
336 | |