mysql - 使用选择查询加载数据文件以进行数据查找

Question

我能够使用以下创建和加载数据文件命令成功加载文件:

--Create and load addresses
CREATE TABLE `addresses` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) NOT NULL,
  `address1` varchar(100) NOT NULL,
  `address2` varchar(100) DEFAULT NULL,
  `city` varchar(100) NOT NULL,
  `stateCode` varchar(2) NOT NULL,
  `zipCode` varchar(10) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=64 DEFAULT CHARSET=utf8;

LOAD DATA INFILE 'C:/temp/address.dat'    
    INTO TABLE mbc.addresses
    FIELDS
        TERMINATED BY X'1F'
    LINES
        TERMINATED BY X'1E'
    (name,address1,address2,city,stateCode,zipCode);

现在，我想使用加载到地址中的地址 ID 将数据从另一个文件 (receipt.dat) 加载到收据表中。目前，地址名称存储在receipt.dat 的“addressId”字段中。我想做这样的事情，但不确定正确的语法是什么:

--Create and load receipts
CREATE TABLE `receipts` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `receiptDate` date NOT NULL,
  `addressId` bigint(20) NOT NULL,
  `amount` decimal(10,0) NOT NULL,
  `notes` varchar(200) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `addressFK_idx` (`addressId`),
  CONSTRAINT `addressFK` FOREIGN KEY (`addressId`) REFERENCES `addresses` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

LOAD DATA INFILE 'C:/temp/receipt.dat'    
    INTO TABLE mbc.receipts
    FIELDS
        TERMINATED BY X'1F'
    LINES
        TERMINATED BY X'1E'
    (receiptDate, 
    select max(addressId) from mbc.addresses where name = @addressId,  
    amount, 
    notes);

格式化上面的 select max(addressId... 行(如果有的话)的正确方法是什么？

Answer 1

您可以设置addresId:

--Create and load receipts
CREATE TABLE `receipts` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `receiptDate` date NOT NULL,
  `addressId` bigint(20) NOT NULL,
  `amount` decimal(10,0) NOT NULL,
  `notes` varchar(200) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `addressFK_idx` (`addressId`),
  CONSTRAINT `addressFK` FOREIGN KEY (`addressId`) REFERENCES `addresses` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

LOAD DATA INFILE 'C:/temp/receipt.dat'    
    INTO TABLE mbc.receipts
    FIELDS
        TERMINATED BY X'1F'
    LINES
        TERMINATED BY X'1E'
    (receiptDate, amount, notes)
    SET addressId = select max(addressId) from mbc.addresses where name = @addressId;

希望对你有帮助。