database_interface.lib.php

一个用PHP编写的

function PMA_DBI_postConnect($link, $is_controluser = false)
{
    if (!defined('PMA_MYSQL_INT_VERSION')) {
        $mysql_version = PMA_DBI_fetch_value(
            'SELECT VERSION()', 0, 0, $link, PMA_DBI_QUERY_STORE);
        if ( $mysql_version ) {
            $match = explode('.', $mysql_version);
            define('PMA_MYSQL_INT_VERSION',
                (int) sprintf('%d%02d%02d', $match[0], $match[1],
                        intval($match[2])));
            define('PMA_MYSQL_STR_VERSION', $mysql_version);
            unset($mysql_version, $match);
        } else {
            define('PMA_MYSQL_INT_VERSION', 32332);
            define('PMA_MYSQL_STR_VERSION', '3.23.32');
        }
    }

    if (!defined('PMA_ENGINE_KEYWORD')) {
        if (PMA_MYSQL_INT_VERSION >= 40102) {
            define('PMA_ENGINE_KEYWORD','ENGINE');
        } else {
            define('PMA_ENGINE_KEYWORD','TYPE');
        }
    }

    if (PMA_MYSQL_INT_VERSION >= 40100) {

        // If $lang is defined and we are on MySQL >= 4.1.x,
        // we auto-switch the lang to its UTF-8 version (if it exists and user
        // didn't force language)
        if ( !empty($GLOBALS['lang'])
          && (substr($GLOBALS['lang'], -5) != 'utf-8')
          && !isset($GLOBALS['cfg']['Lang']) ) {
            $lang_utf_8_version =
                substr($GLOBALS['lang'], 0, strpos($GLOBALS['lang'], '-'))
                . '-utf-8';
            if (!empty($GLOBALS['available_languages'][$lang_utf_8_version])) {
                $GLOBALS['lang'] = $lang_utf_8_version;
                $GLOBALS['charset'] = 'utf-8';
            }
        }

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

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

        // Add some field types to the list, this needs to be done once per session!
        if ($GLOBALS['cfg']['ColumnTypes'][count($GLOBALS['cfg']['ColumnTypes']) - 1] != 'VARBINARY') {
            $GLOBALS['cfg']['ColumnTypes'][] = 'BINARY';
            $GLOBALS['cfg']['ColumnTypes'][] = 'VARBINARY';
        }

    } 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 === $value ) {
        if ( is_array($key) ) {
            while ( $row = $fetch_function($result) ) {
                $result_target =& $resultrows;
                foreach ( $key as $key_index ) {
                    if ( ! isset( $result_target[$row[$key_index]] ) ) {
                        $result_target[$row[$key_index]] = array();
                    }
                    $result_target =& $result_target[$row[$key_index]];
                }
                $result_target = $row;
            }
        } else {
            while ( $row = $fetch_function($result) ) {
                $resultrows[$row[$key]] = $row;
            }
        }
    } else {
        if ( is_array($key) ) {
            while ( $row = $fetch_function($result) ) {
                $result_target =& $resultrows;
                foreach ( $key as $key_index ) {
                    if ( ! isset( $result_target[$row[$key_index]] ) ) {
                        $result_target[$row[$key_index]] = array();
                    }
                    $result_target =& $result_target[$row[$key_index]];
                }
                $result_target = $row[$value];
            }
        } else {
            while ( $row = $fetch_function($result) ) {
                $resultrows[$row[$key]] = $row[$value];
            }
        }
    }

    PMA_DBI_free_result($result);
    return $resultrows;
}

/**
 * return default table engine for given 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 );
    }
}

?>