How to obtain column comments from SQL

问题

As you guys propably know, there's the possibility to add a comment to a column in MySQL. Now I was wondering how I could obtain this comment via PHP/MySQL. I was searching the web but I didn't find any solution yet. Do you guys have any idea/solution for this problem?

Greetings!

回答1:

SELECT
    COLUMN_COMMENT
FROM
    INFORMATION_SCHEMA.COLUMNS
WHERE
    TABLE_SCHEMA = 'db-name' AND
    TABLE_NAME = 'table-name' AND
    COLUMN_NAME = 'column-name'

http://dev.mysql.com/doc/refman/5.0/en/columns-table.html

回答2:

Just use this SQL:

SHOW FULL COLUMNS FROM myTable

http://dev.mysql.com/doc/refman/5.0/en/show-columns.html

The FULL keyword causes the output to include the column collation and comments, as well as the privileges you have for each column.

回答3:

Data regarding MySQL's tables in stored in the information_schema views.
You should be able to get it from there. This requires root privileges.

SELECT table_schema, table_name, column_comment 
FROM INFORMATION_SCHEMA.`columns` c
WHERE c.table_schema = 'mydatabase' 
  AND c.table_name = 'mytable'
  AND c.column_name = 'myfield'

回答4:

You can fetch those metadata from the information_schema database.

Ex:

SELECT column_name, column_comment FROM information_schema.columns WHERE table_name = 'user'

Where user is your table name.

回答5:

If you have correct privileges you could make this query:

$query = "SHOW FULL COLUMNS from node;";

$result = mysql_query($query);

And then fetch the results (there is a column named Comment that holds the comments)

回答6:

Use the SQL command SHOW FULL COLUMNS as described in the MySQL manual. Its output contains the comments.

来源：https://stackoverflow.com/questions/6752169/how-to-obtain-column-comments-from-sql

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