如何获得mysql表列数据类型?

I want to get the column data type of a mysql table.

我想获取mysql表的列数据类型。

Thought I could use MYSQLFIELD structure but it was enumerated field types.

虽然我可以使用MYSQLFIELD结构，但它是枚举字段类型。

Then I tried with mysql_real_query()

然后我尝试使用mysql_real_query()

The error which i am getting is query was empty

我得到的错误是查询为空

How do I get the column data type?

如何获得列数据类型?

10 个解决方案

#1

You can use the information_schema columns table:

可以使用information_schema列表:

SELECT DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS 
  WHERE table_name = 'tbl_name' AND COLUMN_NAME = 'col_name';

#2

The query below returns a list of information about each field, including the MySQL field type. Here is an example:

下面的查询返回关于每个字段的信息列表，包括MySQL字段类型。这是一个例子:

SHOW FIELDS FROM tablename
/* returns "Field", "Type", "Null", "Key", "Default", "Extras" */

See this manual page.

见本手册页面。

#3

Most answers are duplicates, it might be useful to group them. Basically two simple options have been proposed.

大多数答案都是重复的，对它们进行分组可能是有用的。基本上提出了两个简单的选择。

First option

The first option has 4 different aliases, some of which are quite short :

第一个选项有4个不同的别名，其中一些很短:

EXPLAIN db_name.table_name;
DESCRIBE db_name.table_name;
SHOW FIELDS FROM db_name.table_name;
SHOW COLUMNS FROM db_name.table_name;

(NB : as an alternative to db_name.table_name, one can use a second FROM : db_name FROM table_name).

(NB:作为db_name的替代品。表_name，可以使用第二个FROM: db_name FROM table_name)。

This gives something like :

这就给出了如下内容:

+------------------+--------------+------+-----+---------+-------+
| Field            | Type         | Null | Key | Default | Extra |
+------------------+--------------+------+-----+---------+-------+
| product_id       | int(11)      | NO   | PRI | NULL    |       |
| name             | varchar(255) | NO   | MUL | NULL    |       |
| description      | text         | NO   |     | NULL    |       |
| meta_title       | varchar(255) | NO   |     | NULL    |       |
+------------------+--------------+------+-----+---------+-------+

Second option

The second option is a bit longer :

第二个选择稍微长一点:

SELECT
  COLUMN_NAME, DATA_TYPE 
FROM
  INFORMATION_SCHEMA.COLUMNS 
WHERE
  TABLE_SCHEMA = 'db_name'
AND
  TABLE_NAME = 'table_name';

It is also less talkative :

它也不那么健谈:

+------------------+-----------+
| column_name      | DATA_TYPE |
+------------------+-----------+
| product_id       | int       |
| name             | varchar   |
| description      | text      |
| meta_title       | varchar   |
+------------------+-----------+

It has the advantage of allowing selection per column, though, using AND COLUMN_NAME = 'column_name' (or like).

不过，它允许对每个列进行选择，使用和COLUMN_NAME = ' COLUMN_NAME '(或类似)。

#4

To get data types of all columns:

获取所有列的数据类型:

describe table_name

or just a single column:

或者仅仅是一栏:

describe table_name column_name

#5

Refer this link

请参考这个链接

mysql> SHOW COLUMNS FROM mytable FROM mydb;
mysql> SHOW COLUMNS FROM mydb.mytable;

Hope this may help you

希望这能对你有所帮助

#6

Please use the below mysql query.

请使用下面的mysql查询。

SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH 
FROM information_schema.columns 
WHERE table_schema = '<DATABASE NAME>' 
AND table_name = '<TABLE NAME>' 
AND COLUMN_NAME = '<COLOMN NAME>' 

#7

First select the Database using use testDB; then execute

首先使用testDB选择数据库;然后执行

desc `testDB`.`images`;
-- or
SHOW FIELDS FROM images;

Output:

输出:

#8

Query to find out all the datatype of columns being used in any database

查询以查找任何数据库中使用的列的所有数据类型

SELECT distinct DATA_TYPE FROM INFORMATION_SCHEMA.columns 
WHERE table_schema = '<db_name>' AND column_name like '%';

#9

SHOW COLUMNS FROM mytable

从mytable显示列

Self contained complete examples are often useful.

自我包含的完整示例通常是有用的。

<?php
  // The server where your database is hosted                 localhost
  // The name of your database                                mydatabase
  // The user name of the database user                       databaseuser
  // The password of the database user                        thesecretpassword
  // Most web pages are in utf-8 so should be the database    array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8")
  try
  {
    $pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "databaseuser", "thesecretpassword", array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));  
  }
    catch(PDOException $e)
  {
    die('Could not connect: ' . $e->getMessage());
  }

  $sql   = "SHOW COLUMNS FROM mytable";
  $query = $pdo->prepare($sql);
  $query->execute();

  $err = $query->errorInfo();
  $bug = $err[2];

  if ($bug != "") { echo "<p>$bug</p>"; }

  while ($row = $query->fetch(PDO::FETCH_ASSOC))
  {
    echo "<pre>" . print_r($row, true) . "</pre>";
  }

  /* OUTPUT SAMPLE  
  Array
  (
      [Field] => page_id
      [Type] => char(40)
      [Null] => NO
      [Key] => 
      [Default] => 
      [Extra] => 
  )

  Array
  (  
      [Field] => last_name
      [Type] => char(50)
      More ...
  */
?>

#10

ResultSet rs = Sstatement.executeQuery("SELECT * FROM Table Name");

ResultSetMetaData rsMetaData = rs.getMetaData();

int numberOfColumns = rsMetaData.getColumnCount();
System.out.println("resultSet MetaData column Count=" + numberOfColumns);

for (int i = 1; i <= numberOfColumns; i++) {
 System.out.println("column number " + i);

  System.out.println(rsMetaData.getColumnTypeName(i));
}