MySQL 5.7.7開始，支持了JSON類型。

CREATE TABLE IF NOT EXISTS `spss`.`variable` (
  `name` VARCHAR(512) NOT NULL,
  `type` JSON NOT NULL,
  `width` INT NOT NULL,
  `decimals` INT NOT NULL,
  `label` VARCHAR(512) NOT NULL,
  `values` JSON NOT NULL,
  `missing` JSON NOT NULL,
  `columns` INT NOT NULL,
  `align` ENUM(‘Left‘, ‘Right‘, ‘Center‘) NOT NULL,
  `measure` ENUM(‘Scale‘, ‘Ordinal‘, ‘Norminal‘) NOT NULL,
  `role` ENUM(‘Input‘, ‘Target‘, ‘Both‘, ‘None‘, ‘Partation‘, ‘Split‘) NOT NULL,
  PRIMARY KEY (`name`))
ENGINE = InnoDB;

insert into variable values(‘S1‘, ‘{"Numeric":"8:0"}‘, 8, 0, ‘您的性別?‘, ‘{"1":"男","2":"女"}‘, ‘{"Missing":"None"}‘,8,‘Left‘,‘Nominal‘, ‘Input‘);
insert into variable values(‘S2‘, ‘{"Numeric":"8:0"}‘, 8, 0, ‘您的實際年齡?‘, ‘{}‘, ‘{}‘,8,‘Left‘,‘Nominal‘, ‘Input‘);

select * from variable where JSON_Extract( `values`,‘$."1"‘) = ‘男‘;
select * from variable where `values`->‘$."1"‘ = ‘男‘;
select * from variable where measure = ‘Nominal‘;

註意的幾點：

1. ENUM類型的用法。

2. JSON類型的用法。

3. JSON類型中，關鍵字如果是數字：‘{"1":"男","2":"女"}‘，在查詢時要用雙引號把數字括起來：`values`->‘$."1"‘

4. 列名是SQL關鍵詞時，用“`”字符包裹列名，如上面的例子裏的`values`。

本文出自 “GONE WITH THE WIND” 博客，請務必保留此出處http://h2appy.blog.51cto.com/609721/1945105

MySQL中的JSON