php - 将注释放在 createtable 语句的中间

Question

我得到了这个创建表语句；

$sql = "CREATE TABLE TermsFinal(
    `seed`          INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    `source`        varchar(100),
    `old_term`      varchar(255),
    `new_term`      varchar(100),
    `same_as`       varchar(100),
    `last_access`   datetime)";

有没有办法在此声明中添加评论，效果如下？

$sql = "CREATE TABLE TermsFinal(
    `seed`          INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    `source`        varchar(100),    //sample value services.media
    `old_term`      varchar(255),    // something like  "services.media>category:perspective"
    `new_term`      varchar(100),    // something like "opinion"
    `same_as`       varchar(100),    // the seed id of another record or another  "old_term" from this table 
    `last_update`   datetime)";      // when the last update took place

Answer 1

尝试遵循 SQL 注释语法，但要小心文本中的 "

$sql = "CREATE TABLE TermsFinal( 
    `seed`          INT NOT NULL AUTO_INCREMENT PRIMARY KEY, 
    `source`        varchar(100),    -- sample value services.media 
    `old_term`      varchar(255),    -- something like  "services.media>category:perspective" 
    `new_term`      varchar(100),    -- something like "opinion" 
    `same_as`       varchar(100),    -- the seed id of another record or another  "old_term" from this table  
    `last_update`   datetime)";      // when the last update took place 

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Answer 2

您必须在您仍在 sql 语句中的行中使用 sql 注释。对于 mysql，这将是：

$sql = "CREATE TABLE TermsFinal(
`seed`          INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
`source`        varchar(100),    /* sample value services.media */
`old_term`      varchar(255),    /* something like  "services.media>category:perspective" */
`new_term`      varchar(100),    /* something like "opinion" */
`same_as`       varchar(100),    /* the seed id of another record or another  "old_term" from this table */
`last_update`   datetime)";      // when the last update took place