/[fcproducts]/class.DBI
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Revision 1.1.1.1 - (show annotations) (vendor branch)
Wed Jun 6 03:18:29 2001 UTC (17 years, 10 months ago) by ravilov
Branch: MAIN, pliva
CVS Tags: r0, HEAD
Changes since 1.1: +0 -0 lines
first import

1 <?PHP // -*-Mode: C++;-*-
2 /*
3 Bill Adams (bill<at>evil<dot>inetarena<dot>com)
4 DBI.php3 -- A perl DBI like class.
5 See: http://evil.inetarena.com/php/DBI.php for more info.
6
7 Licence: LGPL (http://www.gnu.org/).
8
9 This software is provided "AS IS" with no warrenty either implicit,
10 explicit or otherwise. Use at your own risk.
11
12 ...
13
14 Notes:
15
16 o 'do' is called 'dbh_do' in this because 'do' is a reserved word.
17
18 o Not every function is implemented.
19
20
21 28 Mar 2000 baa Fixed the sth function to call the right constructor so
22 . one can have multiple database connections.
23
24 */
25
26 class DBI {
27
28 var $db_type = '';
29 var $dbh = '';
30 var $DBD;
31 var $errorstr = '';
32 var $is_persistent;
33 var $exit_on_fail = 0;
34
35 function parse_dbi_string( $dbi_connect_str ){
36
37 if( ereg( "(p)?dbi:(.+):(.+)[;:](host=)?(.+)", $dbi_connect_str, $regs ) ||
38 ereg( "(p)?dbi:(.+):(.+)", $dbi_connect_str, $regs )){
39 $dbi[db_type] = $regs[2];
40 $dbi[db_name] = $regs[3];
41 $dbi[db_host] = ( $regs[5] ? $regs[5] : '' );
42 $dbi[is_persistent] = ( $regs[1] ? 1 : 0 );
43 //echo "Connecting: [ ",
44 //$dbi[db_type],"][",
45 //$dbi[db_name],"][",
46 //$dbi[dbh_user], "][",
47 //$dbi[db_host], "]<br>\n";
48 return( $dbi );
49
50 } else {
51 echo "DBI: Invalid Connect String '$dbi_connect_str'.<br>\n";
52 return;
53 }
54
55 }
56
57 function DBI( $dbi_connect_str, $db_user = '', $db_passwd = '' ){
58
59 $this->is_persistent = 0;
60 $dbi_info = $this->parse_dbi_string( $dbi_connect_str );
61 if( ! $dbi_info ){ return; }
62 $this->is_persistent = $db_info[is_persistent];
63
64
65 if( $dbi_info[db_type] != '' ){
66 $this->connect( $dbi_info[db_type], $dbi_info[db_name],
67 $dbi_info[db_host],
68 $db_user, $db_passwd,
69 $dbi_info[is_persistent] );
70 }
71 return $this;
72 //Arrg! There is no way to return a false object on the new.
73 // so that means the user will have to check $this->dbh to see if
74 // the connection was made.
75 }//end constructor
76
77
78 function connect( $db_type, $db_name, $db_host = '',
79 $db_user = '', $db_passwd = '',
80 $is_persistent = 0 ){
81
82 //See if we need to parse the db_type...
83 if( ereg( "(p)?dbi:(.+):(.+)[;:](.+)", $db_type, $regs ) ||
84 ereg( "(p)?dbi:(.+):(.+)[;:]?(.+)?", $db_type, $regs )){
85 $db_user = $db_name;
86 $db_passwd = $db_host;
87 $db_type = $regs[2];
88 $db_name = $regs[3];
89 $db_host = ( $regs[4] ? $regs[4] : 'localhost' );
90 $is_persistent = ( $regs[1] ? 1 : 0 );
91 //echo "Connecting: [ $db_name ][ $dbh_user ][ $db_host ]<br>\n";
92 }
93
94 $this->is_persistent = $is_persistent;
95
96 //Select the database type.
97 if( eregi( "^mysql$", $db_type )){
98 $db_type = 'mysql'; //perl string for this database.
99 } else if( eregi( "informix", $db_type )){
100 $db_type = 'Informix';
101 } else if( eregi( "sybase", $db_type )){
102 $db_type = 'sybase';
103 } else if (eregi( "Pg", $db_type )){
104 $db_type = 'Pg';
105 }
106 $this->db_type = $db_type;
107
108
109 //Include the file only if we have not already read it.
110 if( ! $GLOBALS['classDBD'.$db_type."_read"] ){
111 include( 'class.DBD::'.$db_type );
112 }
113
114 //Check to see if we could read it...
115 if( ! $GLOBALS['classDBD'.$db_type."_read"] ){
116 echo "Error: No DBD for $db_type.<br>\n";
117 $this->errstr = "Error: No DBD driver for '$db_type'.";
118 return;
119 }
120
121 //Track the connections. The reason for doing this is that
122 // if the user tries (at least with MySQL_* functions) to
123 // connecto to a mysql database with the same arguments
124 // then mysql_connect will return the same connection handle.
125 // This is a problem when the user tries to select two different
126 // MySQL databases using the same host, user, and password.
127 //$GLOBALS[classDBI_connectiontrack] = array( );
128 if( $GLOBALS[classDBI_connectiontrack]
129 [$db_type][$db_host][$db_user][$db_passwd]
130 &&
131 $GLOBALS[classDBI_connectiontrack]
132 [$db_type][$db_host][$db_user][$db_passwd] != $db_name ){
133 echo "<B>DBI Warning:</B> You are trying to connect to two different ",
134 $db_type," databases with the same host, user, and password. ",
135 "This will probably give you unexpected results. ",
136 "Expect problems.",
137 "<br>\n";
138 }
139
140 $DBD_class = 'DBD_'.$db_type;
141 $this->DBD = new $DBD_class;
142
143 //Originally, I was going to have the sub class set the variables
144 // in this class but when you do something like $class1 = $class2,
145 // PHP makes a copy of the class so changes to class2 will not
146 // be shown in class1. For this reason, functions will need to be
147 // fully parameterized and the value of DBD->errstr will have to be
148 // copied after the call.
149
150 //Note that the arg list for the DBD connect is different than that
151 // of this connect.
152 $conn = $this->DBD->DBD_connect( $db_name, $db_host,
153 $db_user, $db_passwd,
154 $this->is_persistent );
155
156 if( !$conn ){
157 $this->errstr = $this->DBD->errstr;
158 return;
159 }
160
161 $GLOBALS[classDBI_connectiontrack]
162 [$db_type][$db_host][$db_user][$db_passwd] = $db_name;
163
164 $this->dbh = $conn;
165 return( $this );
166 }//end connect function
167
168
169 function disconnect( ){
170 if( $this->DBD ){
171 $this->DBD->disconnect( );
172 }
173 }//end disconnect function
174
175
176 function exit_on_fail( $yesno = '' ){
177 //Should the program stop if a query fails?
178 // This is partially implemented.
179 if( $yesno != '' ){
180 $this->DBD->exit_on_fail = $yesno;
181 }
182 return( $this->DBD->exit_on_fail );
183 }
184
185
186 function prepare( $query ){
187 //Does nothing but save the query. Be sure we call the
188 // prepare of the DBD object. Otherwise
189 // we get conflicts if we try to have more than one
190 // database handle.
191 if( ! $this->dbh ){ return; }
192 $sth = $this->DBD->prepare( $query );
193 $this->errstr = $this->DBD->errstr;
194 return( $sth );
195 }//end dbh prepare fn
196
197
198 //do is a reserved word so I have to name this something else.
199 function dbh_do( $query ){
200 //run the query and return the number of affected rows.
201 $rows = $this->DBD->dbh_do( $query );
202 $this->errstr = $this->DBD->errstr;
203 if( $rows == 0 ){ $rows = '0E0'; }
204 return( $rows );
205 }//end fn do
206
207
208 function insert_id( ){
209 //Get the last serial number from an insert.
210 return( $this->DBD->insert_id( ));
211 }//end fn insert_id
212
213 function quote( $string ){
214 return( $this->DBD->quote( $string ));
215 }
216
217 }//end DBI class
218
219 //Print out warnings if the user gets duplicate connections.
220 $GLOBALS[classDBI_connectiontrack] = array( );

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