oci8.php

apache windows下的一款好

     *
     * @return DB statement resource
     */
    function prepare($query)
    {
        $tokens = split('[\&\?]', $query);
        $token = 0;
        $types = array();
        for ($i = 0; $i < strlen($query); $i++) {
            switch ($query[$i]) {
                case '?':
                    $types[$token++] = DB_PARAM_SCALAR;
                    break;
                case '&':
                    $types[$token++] = DB_PARAM_OPAQUE;
                    break;
            }
        }
        $binds = sizeof($tokens) - 1;
        for ($i = 0; $i < $binds; $i++) {
            $newquery .= $tokens[$i] . ":bind" . $i;
        }
        $newquery .= $tokens[$i];
        $this->last_query = $query;
        $newquery = $this->modifyQuery($newquery);
        $stmt = @OCIParse($this->connection, $newquery);
        $this->prepare_types[$stmt] = $types;
        $this->manip_query[(int)$stmt] = DB::isManip($query);
        return $stmt;
    }

    // }}}
    // {{{ execute()

    /**
     * Executes a DB statement prepared with prepare().
     *
     * @param $stmt a DB statement resource (returned from prepare())
     * @param $data data to be used in execution of the statement
     *
     * @return int returns an oci8 result resource for successful
     * SELECT queries, DB_OK for other successful queries.  A DB error
     * code is returned on failure.
     */
    function execute($stmt, $data = false)
    {
        $types=&$this->prepare_types[$stmt];
        if (($size = sizeof($types)) != sizeof($data)) {
            return $this->raiseError(DB_ERROR_MISMATCH);
        }
        for ($i = 0; $i < $size; $i++) {
            if (is_array($data)) {
                $pdata[$i] = &$data[$i];
            }
            else {
                $pdata[$i] = &$data;
            }
            if ($types[$i] == DB_PARAM_OPAQUE) {
                $fp = fopen($pdata[$i], "r");
                $pdata = '';
                if ($fp) {
                    while (($buf = fread($fp, 4096)) != false) {
                        $pdata[$i] .= $buf;
                    }
                }
            }
            if (!@OCIBindByName($stmt, ":bind" . $i, $pdata[$i], -1)) {
                return $this->oci8RaiseError($stmt);
            }
        }
        if ($this->autoCommit) {
            $success = @OCIExecute($stmt, OCI_COMMIT_ON_SUCCESS);
        }
        else {
            $success = @OCIExecute($stmt, OCI_DEFAULT);
        }
        if (!$success) {
            return $this->oci8RaiseError($stmt);
        }
        $this->last_stmt = $stmt;
        if ($this->manip_query[(int)$stmt]) {
            return DB_OK;
        } else {
            return new DB_result($this, $stmt);
        }
    }

    // }}}
    // {{{ autoCommit()

    /**
     * Enable/disable automatic commits
     *
     * @param $onoff true/false whether to autocommit
     */
    function autoCommit($onoff = false)
    {
        $this->autoCommit = (bool)$onoff;;
        return DB_OK;
    }

    // }}}
    // {{{ commit()

    /**
     * Commit transactions on the current connection
     *
     * @return DB_ERROR or DB_OK
     */
    function commit()
    {
        $result = @OCICommit($this->connection);
        if (!$result) {
            return $this->oci8RaiseError();
        }
        return DB_OK;
    }

    // }}}
    // {{{ rollback()

    /**
     * Roll back all uncommitted transactions on the current connection.
     *
     * @return DB_ERROR or DB_OK
     */
    function rollback()
    {
        $result = @OCIRollback($this->connection);
        if (!$result) {
            return $this->oci8RaiseError();
        }
        return DB_OK;
    }

    // }}}
    // {{{ affectedRows()

    /**
     * Gets the number of rows affected by the last query.
     * if the last query was a select, returns 0.
     *
     * @return number of rows affected by the last query or DB_ERROR
     */
    function affectedRows()
    {
        if ($this->last_stmt === false) {
            return $this->oci8RaiseError();
        }
        $result = @OCIRowCount($this->last_stmt);
        if ($result === false) {
            return $this->oci8RaiseError($this->last_stmt);
        }
        return $result;
    }

    // }}}
    // {{{ modifyQuery()

    function modifyQuery($query)
    {
        // "SELECT 2+2" must be "SELECT 2+2 FROM dual" in Oracle
        if (preg_match('/^\s*SELECT/i', $query) &&
            !preg_match('/\sFROM\s/i', $query)) {
            $query .= " FROM dual";
        }
        return $query;
    }

    // }}}
    // {{{ modifyLimitQuery()

    /**
    * Emulate the row limit support altering the query
    *
    * @param string $query The query to treat
    * @param int    $from  The row to start to fetch from
    * @param int    $count The offset
    * @return string The modified query
    *
    * @author Tomas V.V.Cox <[e-mail]>
    */
    function modifyLimitQuery($query, $from, $count)
    {
        // Find fields (supports UNIONs also)
        $t = preg_split('/\s+FROM\s+/is', $query);
        $f = preg_replace('/^\s*SELECT\s+/is', '', $t[0]);

        // Put the "Order by" statement at the end of the final query
        if (preg_match('/\s+ORDER\s+BY\s+.*/is', $query, $match)) {
            $orderby = $match[0];
            $query = substr($query, 0, -1 * strlen($orderby));
        } else {
            $orderby = '';
        }

        // Field parsing: Try to find final column names
        $fa = array();
        $grab = true;
        $tmpbuff = '';
        for ($i = 0; $i < strlen($f); $i++) {
            // Probably doesn't work if the query contains a funcion without
            // alias ("AS"), for ex: to_char(...) as date
            if ($f{$i} == '(') { //don't parse commas acting as func params
                $grab = false;
            } elseif ($f{$i} == ')') {
                $grab = true;
            }
            if (preg_match('/\sAS\s/i', substr($tmpbuff, -4))) {
                $tmpbuff = '';
            }
            if ($f{$i} == ',' && $grab) {
                $fa[] = $tmpbuff;
                $tmpbuff = '';
                continue;
            }
            $tmpbuff .= $f{$i};
        }
        $fa[] = $tmpbuff;
        $fields = implode(', ', $fa);

        // Construct the query
        // more at: http://marc.theaimsgroup.com/?l=php-db&m=99831958101212&w=2
        $query = "SELECT $fields FROM".
                 "  (SELECT rownum as linenum, $fields FROM".
                 "      ($query)".
                 "  ) ".
                 "WHERE linenum BETWEEN $from AND ". ($from + $count) .
                 "$orderby";

        return $query;
    }

    // }}}
    // {{{ nextId()

    /**
     * Get the next value in a sequence.  We emulate sequences
     * for MySQL.  Will create the sequence if it does not exist.
     *
     * @access public
     *
     * @param $seq_name the name of the sequence
     *
     * @param $ondemand whether to create the sequence table on demand
     * (default is true)
     *
     * @return a sequence integer, or a DB error
     */
    function nextId($seq_name, $ondemand = true)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        $repeat = 0;
        do {
            $result = $this->query("SELECT ${sqn}_seq.nextval FROM dual");
            if ($ondemand && DB::isError($result) &&
                $result->getCode() == DB_ERROR_NOSUCHTABLE) {
                $repeat = 1;
                $result = $this->createSequence($seq_name);
                if (DB::isError($result)) {
                    return $result;
                }
            } else {
                $repeat = 0;
            }
        } while ($repeat);
        if (DB::isError($result)) {
            return $result;
        }
        $arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
        return $arr[0];
    }

    // }}}
    // {{{ createSequence()

    function createSequence($seq_name)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        return $this->query("CREATE SEQUENCE ${sqn}_seq");
    }

    // }}}
    // {{{ dropSequence()

    function dropSequence($seq_name)
    {
        $sqn = preg_replace('/[^a-z0-9_]/i', '_', $seq_name);
        return $this->query("DROP SEQUENCE ${sqn}_seq");
    }

    // }}}
    // {{{ oci8RaiseError()

    function oci8RaiseError($errno = null)
    {
        if ($errno === null) {
            $error = @OCIError($this->connection);
            return $this->raiseError($this->errorCode($error['code']),
                                     null, null, null, $error['message']);
        } elseif (is_resource($errno)) {
            $error = @OCIError($errno);
            return $this->raiseError($this->errorCode($error['code']),
                                     null, null, null, $error['message']);
        }
        return $this->raiseError($this->errorCode($errno));
    }

    // }}}
    // {{{ getSpecialQuery()

    /**
    * Returns the query needed to get some backend info
    * @param string $type What kind of info you want to retrieve
    * @return string The SQL query string
    */
    function getSpecialQuery($type)
    {
        switch ($type) {
            case 'tables':
                $sql = "SELECT table_name FROM user_tables";
                break;
            default:
                return null;
        }
        return $sql;
    }

    // }}}

}

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