How does MySQL recognize whether there are Chinese characters

This article mainly introduces MySQL how to identify whether there are Chinese characters, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

1) use the formal expression regexp "[u0391-uFFE5]"

2) use length and char_length

[@ more@]

Drop table t1

Create table T1 (id varchar) default charset=utf8

Insert into T1 values ('Chinese'), ('sdalfkj')

1) use the formal expression regexp "[u0391-uFFE5]"

Root@127.0.0.1: test 21:55:33 > select id, id regexp "[u0391-uFFE5] [u0391-uFFE5]" from T1

+-+

| | id | id regexp "[u0391-uFFE5] [u0391-uFFE5]" |

+-+

| | Chinese | 0 | |

| | sdalfkj | 1 | |

+-+

2 rows in set (0.01sec)

2) use length and char_length

Root@127.0.0.1: test 23:33:13 > select id,length (id), char_length (id) from T1

+-+

| | id | length (id) | char_length (id) | |

+-+

| | Chinese | 6 | 2 | |

| | sdalfkj | 7 | 7 |

+-+

2 rows in set (0.00 sec)

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