您需要有以下表格设计(公司/城市) -
CREATE TABLE `companies` (
`companyID` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
`companyName` varchar(150) NOT NULL DEFAULT '',
`address` varchar(300) NOT NULL DEFAULT '',
`cityID` smallint(5) NOT NULL,
`countryID` varchar(3) NOT NULL,
PRIMARY KEY (`companyID`),
KEY `cityID` (`cityID`),
KEY `countryID` (`countryID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `countries` (
`countryID` varchar(3) NOT NULL DEFAULT '',
`countryName` varchar(52) NOT NULL DEFAULT '',
`localName` varchar(45) NOT NULL,
`webCode` varchar(2) NOT NULL,
`region` varchar(26) NOT NULL,
`continent` enum('Asia','Europe','North America','Africa',
'Oceania','Antarctica','South America') NOT NULL,
PRIMARY KEY (`countryID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `cities` (
`cityID` mediumint(8) unsigned NOT NULL AUTO_INCREMENT,
`cityName` varchar(50) NOT NULL,
`stateID` smallint(5) unsigned NOT NULL DEFAULT '0',
`countryID` varchar(3) NOT NULL DEFAULT '',
PRIMARY KEY (`cityID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
您可以从这里下载 mysql 格式的世界城市/国家的完整列表 -
http://myip.ms/info/cities_sql_database/World_Cities_SQL_Mysql_Database.html
.