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db.php
<?php
/*
Sistema: Sistema
Finalidade: Classe para conexão com o banco de dados (postgresql ou mysql).
Autor: Wanderson Ferreira Dias
Observacao:
Alteracoes:
Nro Data Autor - Alteracao
--- -------- -------------------------------------------------------------------
001 20.05.06 Wanderson - 1º versão do programa
*/
class db {
var $host = "localhost";
var $banco;
var $usuario = 'usuariobanco';
var $senha = 'senhabanco';
var $r = array();
var $id_conectar = false;
var $id_query = false;
var $erro=false;
var $sgbd = 'mysql'; // tipo do banco: postgresql ou mysql
var $posicao = 0;
function db($banco,$sgbd='') {
$this->banco = $banco;
if ($sgbd) $this->sgbd = $sgbd;
}
function erro($msg='') {
if ($msg) {
$aux = addslashes(trim(str_replace("\n","",$msg)));
$this->erro = $msg;
}
return $this->erro;
}
function conectar() {
if ($this->sgbd=='mysql') {
$this->id_conectar = mysql_connect($this->host, $this->usuario, $this->senha, true) or die ('erro');
@mysql_select_db($this->banco);
} else if ($this->sgbd=='postgresql') {
if (!$GLOBALS['tty']) $GLOBALS['tty']=1;
else $GLOBALS['tty']++;
$aux = 'host='.$this->host.' dbname='.$this->banco;
if ($this->usuario) $aux.=' user='.$this->usuario;
if ($this->senha) $aux.=' password='.$this->senha;
$aux.=' tty='.$GLOBALS['tty'];
$this->id_conectar = @pg_connect($aux);
}
if (!$this->id_conectar) {
echo 'Erro ao conectar ao banco de dados';
exit;
}
}
function exec($sql) {
if (!$this->id_conectar) $this->conectar();
if ($this->sgbd=='mysql') {
$this->id_query = @mysql_query($sql);
$this->erro(@mysql_error($this->id_conectar));
} else if ($this->sgbd=='postgresql') {
$this->posicao = 0;
$this->id_query = @pg_query($this->id_conectar,$sql);
$this->erro(@pg_last_error($this->id_conectar));
}
return $this->erro;
}
function fetch($type='A') {
if ($this->sgbd=='mysql') {
$result_types = array('A'=>MYSQL_ASSOC,'N'=>MYSQL_NUM,'B'=>MYSQL_BOTH,'a'=>MYSQL_ASSOC,'n'=>MYSQL_NUM,'b'=>MYSQL_BOTH);
$this->r = @mysql_fetch_array($this->id_query,$result_types[$type]);
} else if ($this->sgbd=='postgresql') {
if ($this->posicao>$this->numrows()) {
$this->r = array();
return false;
}
$result_types = array('A'=>PGSQL_ASSOC,'N'=>PGSQL_NUM,'B'=>PGSQL_BOTH,'a'=>PGSQL_ASSOC,'n'=>PGSQL_NUM,'b'=>PGSQL_BOTH);
$this->r = @pg_fetch_array($this->id_query,$this->posicao,$result_types[$type]);
$this->posicao++;
}
if ($this->r) return true;
else return false;
}
function numrows() {
if ($this->sgbd=='mysql') return @mysql_num_rows($this->id_query);
else if ($this->sgbd=='postgresql') return @pg_num_rows($this->id_query);
}
function begin() {
$this->erro = false;
return $this->exec("BEGIN");
}
function commit() {
$this->erro = false;
return $this->exec("COMMIT");
}
function rollback() {
$this->erro = false;
return $this->exec("ROLLBACK");
}
function end() {
$this->erro = false;
return $this->exec("ROLLBACK");
}
function free_result() {
if ($this->sgbd=='mysql') return @mysql_free_result($this->id_query);
else if ($this->sgbd=='postgresql') return @pg_free_result($this->id_query);
}
function registros_afetados() {
if ($this->sgbd=='mysql') return @mysql_affected_rows($this->id_conectar);
else if ($this->sgbd=='postgresql') return @pg_affected_rows($this->id_query);
}
}
?>
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