database_interface.lib.php

WEBGAME源码,有架设说明,只是非常简单

        // and we remove the non-UTF-8 choices to avoid confusion
        if (!defined('PMA_REMOVED_NON_UTF_8')) {
            $tmp_available_languages        = $GLOBALS['available_languages'];
            $GLOBALS['available_languages'] = array();
            foreach ($tmp_available_languages AS $tmp_lang => $tmp_lang_data) {
                if (substr($tmp_lang, -5) == 'utf-8') {
                    $GLOBALS['available_languages'][$tmp_lang] = $tmp_lang_data;
                }
            } // end foreach
            unset($tmp_lang, $tmp_lang_data, $tmp_available_languages);
            define('PMA_REMOVED_NON_UTF_8',1);
        }

        $mysql_charset = $GLOBALS['mysql_charset_map'][$GLOBALS['charset']];
        if ($is_controluser || empty($collation_connection) || (strpos($collation_connection, '_') ? substr($collation_connection, 0, strpos($collation_connection, '_')) : $collation_connection) == $mysql_charset) {
            PMA_DBI_query('SET NAMES ' . $mysql_charset . ';', $link, PMA_DBI_QUERY_STORE);
        } else {
            PMA_DBI_query('SET CHARACTER SET ' . $mysql_charset . ';', $link, PMA_DBI_QUERY_STORE);
        }
        if (!empty($collation_connection)) {
            PMA_DBI_query('SET collation_connection = \'' . $collation_connection . '\';', $link, PMA_DBI_QUERY_STORE);
        }
        if (!$is_controluser) {
            $collation_connection = PMA_DBI_get_variable('collation_connection',     PMA_DBI_GETVAR_SESSION, $link);
            $charset_connection   = PMA_DBI_get_variable('character_set_connection', PMA_DBI_GETVAR_SESSION, $link);
        }

        // Add some field types to the list
        // (we pass twice here; feel free to code something better :)
        if (!defined('PMA_ADDED_FIELD_TYPES')) {
            $GLOBALS['cfg']['ColumnTypes'][] = 'BINARY';
            $GLOBALS['cfg']['ColumnTypes'][] = 'VARBINARY';
            define('PMA_ADDED_FIELD_TYPES',1);
        }

    } else {
        require_once('./libraries/charset_conversion.lib.php');
    }
}

/**
 * returns a single value from the given result or query,
 * if the query or the result has more than one row or field
 * the first field of the first row is returned
 *
 * <code>
 * $sql = 'SELECT `name` FROM `user` WHERE `id` = 123';
 * $user_name = PMA_DBI_fetch_value( $sql );
 * // produces
 * // $user_name = 'John Doe'
 * </code>
 *
 * @uses    is_string()
 * @uses    is_int()
 * @uses    PMA_DBI_try_query()
 * @uses    PMA_DBI_num_rows()
 * @uses    PMA_DBI_fetch_row()
 * @uses    PMA_DBI_fetch_assoc()
 * @uses    PMA_DBI_free_result()
 * @param   string|mysql_result $result query or mysql result
 * @param   integer             $row_number row to fetch the value from,
 *                                      starting at 0, with 0 beeing default
 * @param   integer|string      $field  field to fetch the value from,
 *                                      starting at 0, with 0 beeing default
 * @param   resource            $link   mysql link
 * @param   mixed               $options
 * @return  mixed               value of first field in first row from result
 *                              or false if not found
 */
function PMA_DBI_fetch_value( $result, $row_number = 0, $field = 0, $link = NULL, $options = 0 ) {
    $value = false;

    if ( is_string( $result ) ) {
        $result = PMA_DBI_try_query( $result, $link, $options | PMA_DBI_QUERY_STORE );
    }

    // return false if result is empty or false
    // or requested row is larger than rows in result
    if ( PMA_DBI_num_rows( $result ) < ( $row_number + 1 ) ) {
        return $value;
    }

    // if $field is an integer use non associative mysql fetch function
    if ( is_int( $field ) ) {
        $fetch_function = 'PMA_DBI_fetch_row';
    } else {
        $fetch_function = 'PMA_DBI_fetch_assoc';
    }

    // get requested row
    for ( $i = 0; $i <= $row_number; $i++ ) {
        $row = $fetch_function( $result );
    }
    PMA_DBI_free_result( $result );

    // return requested field
    if ( isset( $row[$field] ) ) {
        $value = $row[$field];
    }
    unset( $row );

    return $value;
}

/**
 * returns only the first row from the result
 *
 * <code>
 * $sql = 'SELECT * FROM `user` WHERE `id` = 123';
 * $user = PMA_DBI_fetch_single_row( $sql );
 * // produces
 * // $user = array( 'id' => 123, 'name' => 'John Doe' )
 * </code>
 *
 * @uses    is_string()
 * @uses    PMA_DBI_try_query()
 * @uses    PMA_DBI_num_rows()
 * @uses    PMA_DBI_fetch_row()
 * @uses    PMA_DBI_fetch_assoc()
 * @uses    PMA_DBI_fetch_array()
 * @uses    PMA_DBI_free_result()
 * @param   string|mysql_result $result query or mysql result
 * @param   string              $type   NUM|ASSOC|BOTH
 *                                      returned array should either numeric
 *                                      associativ or booth
 * @param   resource            $link   mysql link
 * @param   mixed               $options
 * @return  array|boolean       first row from result
 *                              or false if result is empty
 */
function PMA_DBI_fetch_single_row( $result, $type = 'ASSOC', $link = NULL, $options = 0 ) {
    if ( is_string( $result ) ) {
        $result = PMA_DBI_try_query( $result, $link, $options | PMA_DBI_QUERY_STORE );
    }

    // return NULL if result is empty or false
    if ( ! PMA_DBI_num_rows( $result ) ) {
        return false;
    }

    switch ( $type ) {
        case 'NUM' :
            $fetch_function = 'PMA_DBI_fetch_row';
            break;
        case 'ASSOC' :
            $fetch_function = 'PMA_DBI_fetch_assoc';
            break;
        case 'BOTH' :
        default :
            $fetch_function = 'PMA_DBI_fetch_array';
            break;
    }

    $row = $fetch_function( $result );
    PMA_DBI_free_result( $result );
    return $row;
}

/**
 * returns all rows in the resultset in one array
 *
 * <code>
 * $sql = 'SELECT * FROM `user`';
 * $users = PMA_DBI_fetch_result( $sql );
 * // produces
 * // $users[] = array( 'id' => 123, 'name' => 'John Doe' )
 *
 * $sql = 'SELECT `id`, `name` FROM `user`';
 * $users = PMA_DBI_fetch_result( $sql, 'id' );
 * // produces
 * // $users['123'] = array( 'id' => 123, 'name' => 'John Doe' )
 *
 * $sql = 'SELECT `id`, `name` FROM `user`';
 * $users = PMA_DBI_fetch_result( $sql, 0 );
 * // produces
 * // $users['123'] = array( 0 => 123, 1 => 'John Doe' )
 *
 * $sql = 'SELECT `id`, `name` FROM `user`';
 * $users = PMA_DBI_fetch_result( $sql, 'id', 'name' );
 * // or
 * $users = PMA_DBI_fetch_result( $sql, 0, 1 );
 * // produces
 * // $users['123'] = 'John Doe'
 *
 * $sql = 'SELECT `name` FROM `user`';
 * $users = PMA_DBI_fetch_result( $sql );
 * // produces
 * // $users[] = 'John Doe'
 * </code>
 *
 * @uses    is_string()
 * @uses    is_int()
 * @uses    PMA_DBI_try_query()
 * @uses    PMA_DBI_num_rows()
 * @uses    PMA_DBI_num_fields()
 * @uses    PMA_DBI_fetch_row()
 * @uses    PMA_DBI_fetch_assoc()
 * @uses    PMA_DBI_free_result()
 * @param   string|mysql_result $result query or mysql result
 * @param   string|integer      $key    field-name or offset
 *                                      used as key for array
 * @param   string|integer      $value  value-name or offset
 *                                      used as value for array
 * @param   resource            $link   mysql link
 * @param   mixed               $options
 * @return  array               resultrows or values indexed by $key
 */
function PMA_DBI_fetch_result( $result, $key = NULL, $value = NULL, $link = NULL, $options = 0 )
{
    $resultrows = array();

    if ( is_string( $result ) ) {
        $result = PMA_DBI_try_query( $result, $link, $options );
    }

    // return empty array if result is empty or false
    if ( ! $result ) {
        return $resultrows;
    }

    $fetch_function = 'PMA_DBI_fetch_assoc';

    // no nested array if only one field is in result
    if ( NULL === $key && 1 === PMA_DBI_num_fields( $result ) ) {
        $value = 0;
        $fetch_function = 'PMA_DBI_fetch_row';
    }

    // if $key is an integer use non associative mysql fetch function
    if ( is_int( $key ) ) {
        $fetch_function = 'PMA_DBI_fetch_row';
    }

    if ( NULL === $key && NULL === $value ) {
        while ( $row = $fetch_function( $result ) ) {
            $resultrows[] = $row;
        }
    } elseif ( NULL === $key ) {
        while ( $row = $fetch_function( $result ) ) {
            $resultrows[] = $row[$value];
        }
    } elseif ( NULL === $value ) {
        while ( $row = $fetch_function( $result ) ) {
            $resultrows[$row[$key]] = $row;
        }
    } else {
        while ( $row = $fetch_function( $result ) ) {
            $resultrows[$row[$key]] = $row[$value];
        }
    }

    PMA_DBI_free_result( $result );
    return $resultrows;
}

/**
 * return default able engine for gicen database
 *
 * @return  string  default table engine
 */
function PMA_DBI_get_default_engine() {
    if ( PMA_MYSQL_INT_VERSION > 50002 ) {
        return PMA_DBI_fetch_value( 'SHOW VARIABLES LIKE \'storage_engine\';', 0, 1 );
    } else {
        return PMA_DBI_fetch_value( 'SHOW VARIABLES LIKE \'table_type\';', 0, 1 );
    }
}

?>