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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 | |