-- Add longitude if not exists
SET @col_exists := (
    SELECT COUNT(*)
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_SCHEMA = DATABASE()
      AND TABLE_NAME = 'servers'
      AND COLUMN_NAME = 'longitude'
);
SET @sql := IF(
    @col_exists = 0,
    'ALTER TABLE `servers` ADD COLUMN `longitude` VARCHAR(255) DEFAULT '''' COMMENT ''longitude''',
    'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Add latitude if not exists
SET @col_exists := (
    SELECT COUNT(*)
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_SCHEMA = DATABASE()
      AND TABLE_NAME = 'servers'
      AND COLUMN_NAME = 'latitude'
);
SET @sql := IF(
    @col_exists = 0,
    'ALTER TABLE `servers` ADD COLUMN `latitude` VARCHAR(255) DEFAULT '''' COMMENT ''latitude''',
    'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Add longitude_center if not exists
SET @col_exists := (
    SELECT COUNT(*)
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_SCHEMA = DATABASE()
      AND TABLE_NAME = 'servers'
      AND COLUMN_NAME = 'longitude_center'
);
SET @sql := IF(
    @col_exists = 0,
    'ALTER TABLE `servers` ADD COLUMN `longitude_center` VARCHAR(255) DEFAULT '''' COMMENT ''longitude center''',
    'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

-- Add latitude_center if not exists
SET @col_exists := (
    SELECT COUNT(*)
    FROM INFORMATION_SCHEMA.COLUMNS
    WHERE TABLE_SCHEMA = DATABASE()
      AND TABLE_NAME = 'servers'
      AND COLUMN_NAME = 'latitude_center'
);
SET @sql := IF(
    @col_exists = 0,
    'ALTER TABLE `servers` ADD COLUMN `latitude_center` VARCHAR(255) DEFAULT '''' COMMENT ''latitude center''',
    'SELECT 1'
);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;