blobstreaming.lib.php

来自「phpMyAdmin图形界面化操作,我已经配置好了,只要把解要压缩后的文件放到站」· PHP 代码 · 共 730 行 · 第 1/2 页

{
    // if no variables exist in array, return false
    if (empty($bs_variables) || count($bs_variables) == 0)
        return FALSE;

    // set BS variables to those specified in array
    foreach ($bs_variables as $key=>$val)
        if (!is_null($val) && strlen($val) > 0)
        {
            // set BS variable to specified value
            $query = "SET GLOBAL $key=" . PMA_sqlAddSlashes($val);
            $result = PMA_DBI_query($query);

            // if query fails execution, return false
            if (!$result)
                return FALSE;
        } // end if (!is_null($val) && strlen($val) > 0)

    // return true on success
    return TRUE;
}

/**
 * returns a list of BLOBStreaming variables used by MySQL
 *
 * @access  public
 * @uses    PMA_Config::get()
 * @uses    PMA_DBI_query()
 * @uses    PMA_DBI_fetch_assoc()
 * @return  array - list of BLOBStreaming variables
*/
function PMA_BS_GetVariables()
{
    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return NULL;

    // run query to retrieve BS variables
    $query = "SHOW VARIABLES LIKE '%" . $PMA_Config->get('PBMS_NAME') . "%'";
    $result = PMA_DBI_query($query);

    $BS_Variables = array();

    // while there are records to retrieve
    while ($data = @PMA_DBI_fetch_assoc($result))
        $BS_Variables[$data['Variable_name']] = $data['Value'];

    // return BS variables
    return $BS_Variables;
}

/**
 * sets the BLOBStreaming global field references to ON/OFF
 *
 * @access  public
 * @param   string - ON or OFF
 * @uses    PMA_Config::get()
 * @uses    PMA_sqlAddslashes()
 * @uses    PMA_DBI_query()
 * @return  boolean - success/failure of query execution
*/
function PMA_BS_SetFieldReferences($val)
{
    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return FALSE;

    // set field references to value specified
    $query = "SET GLOBAL " . $PMA_Config->get('PBMS_NAME') . "_field_references=" . PMA_sqlAddslashes($val);
    $result = PMA_DBI_try_query($query, null, 0);

    // get last known error (if applicable)
    PMA_DBI_getError();

    // return success of query execution
    if ($result && 0 == $GLOBALS['errno'])
        return TRUE;
    else
        return FALSE;
}

/**
 * gets the SQL table definition for a given BLOBStreaming table
 *
 * @access  public
 * @param   string - table name
 * @uses    PMA_Config::get()
 * @return  string - SQL table definition
*/
function PMA_BS_GetTableStruct($tbl_name)
{
    // retrieve table structures for BS tables
    $bs_tables = $_SESSION['PMA_Config']->get('BLOBSTREAMING_TABLES');
   
    // return if tables don't exist 
    if (!$bs_tables)
        return;

    // return if specified table doesn't exist in collection of BS tables
    if (!isset($bs_tables[$tbl_name]))
        return;

    // return specified table's structure
    return $bs_tables[$tbl_name]['struct'];
}

/**
 * creates the BLOBStreaming tables for a given database
 *
 * @access  public
 * @param   string - database name
 * @uses    PMA_Config::get()
 * @uses    PMA_DBI_select_db()
 * @uses    PMA_DBI_query()
 * @uses    PMA_BS_GetTableStruct()
 * @return  boolean - success/failure of transactional query execution
*/
function PMA_BS_CreateTables($db_name)
{
    // retrieve BS tables
    $bs_tables = $_SESSION['PMA_Config']->get('BLOBSTREAMING_TABLES');

    // select specified database
    PMA_DBI_select_db($db_name);

    // create necessary BS tables for specified database
    foreach ($bs_tables as $table_key=>$table)
    {
        $result = PMA_DBI_query(PMA_BS_GetTableStruct($table_key));

        // return false if query execution fails
        if (!$result)
            return FALSE;
    }

    // return true on success
    return TRUE;
}

/**
 * drops BLOBStreaming tables for a given database
 *
 * @access  public
 * @param   string - database name
 * @uses    PMA_Config::get()
 * @uses    PMA_DBI_select_db()
 * @uses    PMA_backquote()
 * @uses    PMA_DBI_query()
 * @return  boolean - success/failure of transactional query execution
*/
function PMA_BS_DropTables($db_name)
{
    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return FALSE;

    // retrieve BS tables
    $bs_tables = $PMA_Config->get('BLOBSTREAMING_TABLES');

    // select specified database
    PMA_DBI_select_db($db_name);

    // drop BS tables
    foreach ($bs_tables as $table_key=>$table)
    {
        $query = "DROP TABLE IF EXISTS " . PMA_backquote($table_key);
        $result = PMA_DBI_query($query);

        // return false if query execution fails
        if (!$result)
            return FALSE;
    }

    // return true on success
    return TRUE;
}

/**
 * returns the field name for a primary key of a given table in a given database
 *
 * @access  public
 * @param   string - database name
 * @param   string - table name
 * @uses    PMA_DBI_select_db()
 * @uses    PMA_backquote()
 * @uses    PMA_DBI_query()
 * @uses    PMA_DBI_fetch_assoc()
 * @return  string - field name for primary key
*/
function PMA_BS_GetPrimaryField($db_name, $tbl_name)
{
    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return FALSE;

    // select specified database
    PMA_DBI_select_db($db_name);

    // retrieve table fields
    $query = "SHOW FULL FIELDS FROM " . PMA_backquote($tbl_name);
    $result = PMA_DBI_query($query);

    // while there are records to parse
    while ($data = PMA_DBI_fetch_assoc($result))
        if ("PRI" == $data['Key'])
            return $data['Field'];

    // return NULL on no primary key
    return NULL;
}

/**
 * checks whether a BLOB reference exists in the BLOB repository
 *
 * @access  public
 * @param   string - BLOB reference
 * @param   string - database name
 * @uses    PMA_DBI_select_db()
 * @uses    PMA_backquote()
 * @uses    PMA_Config::get()
 * @uses    PMA_sqlAddslashes()
 * @uses    PMA_DBI_query()
 * @return  boolean - existence of BLOB reference
*/
function PMA_BS_ReferenceExists($bs_reference, $db_name)
{
    $referenceExists = FALSE;

    // return false on invalid BS reference
    if (strlen ($bs_reference) < strlen ("~*$db_name/~") || "~*$db_name/~" != substr ($bs_reference, 0, strlen ($db_name) + 4))
        return $referenceExists;

    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return $referenceExists;

    // select specified database
    PMA_DBI_select_db($db_name);

    // run query on BS reference retrieval
    $query = "SELECT * FROM " . PMA_backquote($PMA_Config->get('PBMS_NAME') . "_reference") . " WHERE Blob_url='" . PMA_sqlAddslashes($bs_reference) . "'";
    $result = PMA_DBI_query($query);

    // if record exists
    if ($data = @PMA_DBI_fetch_assoc($result))
        $referenceExists = TRUE;

    // return reference existance
    return $referenceExists;
}

/**
 * creates a HTTP link to a given blob reference for a given database
 *
 * @access  public
 * @param   string - BLOB reference
 * @param   string - database name
 * @uses    PMA_Config::get()
 * @uses    PMA_DBI_select_db()
 * @uses    PMA_backquote()
 * @uses    PMA_sqlAddslashes()
 * @uses    PMA_DBI_query()
 * @uses    PMA_DBI_fetch_assoc()
 * @return  string - HTTP link or Error
*/
function PMA_BS_CreateReferenceLink($bs_reference, $db_name)
{
    // load PMA configuration
    $PMA_Config = $_SESSION['PMA_Config'];

    // return if unable to load PMA configuration
    if (empty($PMA_Config))
        return '';

    // generate bs reference link
    $bs_ref_link = 'http://' . $PMA_Config->get('BLOBSTREAMING_SERVER') . '/' . $bs_reference;

    // select specified database
    PMA_DBI_select_db($db_name);

    $pbms_repo_bq = PMA_backquote($PMA_Config->get('PBMS_NAME') . "_repository");
    $pbms_ref_bq = PMA_backquote($PMA_Config->get('PBMS_NAME') . "_reference");
    $pbms_cust_content_bq = PMA_backquote($PMA_Config->get('PBMS_NAME') . "_custom_content_type");

    // run query on determining specified BS reference
    $query = "SELECT $pbms_repo_bq.Content_type, $pbms_cust_content_bq.Content_type AS Custom_type";
    $query .= " FROM $pbms_repo_bq LEFT JOIN $pbms_ref_bq ON";
    $query .= "$pbms_repo_bq.Repository_id=$pbms_ref_bq.Repository_id";
    $query .= " AND $pbms_repo_bq.Blob_size=$pbms_ref_bq.Blob_size";
    $query .= " AND $pbms_repo_bq.Repo_blob_offset=$pbms_ref_bq.Repo_blob_offset";
    $query .= " LEFT JOIN $pbms_cust_content_bq ON $pbms_cust_content_bq.Blob_url=$pbms_ref_bq.Blob_url";
    $query .= " WHERE $pbms_ref_bq.Blob_url='" . PMA_sqlAddslashes($bs_reference) . "'";

    $result = PMA_DBI_query($query);

    // if record exists
    if ($data = @PMA_DBI_fetch_assoc($result))
    {
        // determine content-type for BS repository file (original or custom)
	$is_custom_type = false;

	if (isset($data['Custom_type']))
	{
	        $content_type = $data['Custom_type'];
		$is_custom_type = true;
	}
	else
		$content_type = $data['Content_type'];

        if (!$content_type)
            $content_type = NULL;

        $output = "<a href=\"#\" onclick=\"requestMIMETypeChange('" . urlencode($db_name) . "', '" . urlencode($GLOBALS['table']) . "', '" . urlencode($bs_reference) . "', '" . urlencode($content_type) . "')\">$content_type</a>";

        // specify custom HTML for various content types
        switch ($content_type)
        {
            // no content specified
            case NULL:
                $output = "NULL";
                break;
            // image content
            case 'image/jpeg':
            case 'image/png':
                $output .= ' (<a href="' . $bs_ref_link . '" target="new">' . $GLOBALS['strViewImage'] . '</a>)';
                break;
            // audio content
            case 'audio/mpeg':
                $output .= ' (<a href="#" onclick="popupBSMedia(\'' . PMA_generate_common_url() . '\',\'' . urlencode($bs_reference) . '\', \'' . urlencode($content_type) . '\',' . ($is_custom_type ? 1 : 0) . ', 640, 120)">' . $GLOBALS['strPlayAudio']. '</a>)';
                break;
            // video content
            case 'application/x-flash-video':
            case 'video/mpeg':
                $output .= ' (<a href="#" onclick="popupBSMedia(\'' . PMA_generate_common_url() . '\',\'' . urlencode($bs_reference) . '\', \'' . urlencode($content_type) . '\',' . ($is_custom_type ? 1 : 0) . ', 640, 480)">' . $GLOBALS['strViewVideo'] . '</a>)';
                break;
            // unsupported content. specify download
            default:
                $output .= ' (<a href="' . $bs_ref_link . '" target="new">' . $GLOBALS['strDownloadFile']. '</a>)';
        }

        // return HTML
        return $output;
    } // end if ($data = @PMA_DBI_fetch_assoc($result))

    // return on error
    return 'Error';
}

?>