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MySQL查询获取用BLOB类型声明的列长度

2024-04-30 06:11:03 372

为此，请使用LENGTH()MySQL中的函数。让我们首先创建一个表。我们已经将列的类型声明为BLOB-

mysql> create table DemoTable
(
   Title blob
);

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('This is a MySQL tutorial');
mysql> insert into DemoTable values('Java is an object oriented programming language');
mysql> insert into DemoTable values('C is a procedural language');

使用select语句显示表中的所有记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-------------------------------------------------+
| Title                                           |
+-------------------------------------------------+
| This is a MySQL tutorial                        |
| Java is an object oriented programming language |
| C is a procedural language                      |
+-------------------------------------------------+
3 rows in set (0.00 sec)

以下是使用LENGTH()方法获取使用BLOB类型声明的列长度的查询-

mysql> select length(Title) from DemoTable;

这将产生以下输出-

+---------------+
| length(Title) |
+---------------+
|            24 |
|            47 |
|            26 |
+---------------+
3 rows in set (0.00 sec)

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MySQL查询获取用BLOB类型声明的列长度

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