将MySQL查询的输出转换为UTF8？-mysql教程-PHP中文网

将MySQL查询的输出转换为UTF8？

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发布： 2023-08-23 14:13:08

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将mysql查询的输出转换为utf8？

You need to use CAST() or CONVERT() function to convert output of MySQL query to UTF8. Here, I am using MySQL version 8.0.12. Let us first check the version:

mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.12    |
+-----------+
1 row in set (0.00 sec)

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In this if you use utf8 then you will get warning of aliases because it has utf8mb4. Therefore, you can avoid the warning by placing utf8mb4.

Note: Never use UTF8. For current versions, use UTF8MB4

Here is the syntax to convert output of MySQL query to UTF8:

SELECT yourColumnName1,convert(yourColumnName2 USING utf8) as anyVariableName FROM yourTableName;

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You can use another syntax which is as follows:

SELECT yourColumnName1,CONVERT(CAST(yourColumnName2 as BINARY) USING utf8) as anyVariableName FROM yourTableName;

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To understand the above syntax, let us create a table. The query to create a table is as follows:

mysql> create table ConvertOutputtoUtf8Demo
   -> (
   -> Id int NOT NULL AUTO_INCREMENT,
   -> Name varchar(20),
   -> Age int,
   -> PRIMARY KEY(Id)
   -> );
Query OK, 0 rows affected (0.79 sec)

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Insert some records in the table using insert command. The query is as follows:

mysql> insert into ConvertOutputtoUtf8Demo(Name,Age) values('John',24);
Query OK, 1 row affected (0.78 sec)
mysql> insert into ConvertOutputtoUtf8Demo(Name,Age) values('Larry',21);
Query OK, 1 row affected (0.15 sec)
mysql> insert into ConvertOutputtoUtf8Demo(Name,Age) values('Carol',26);
Query OK, 1 row affected (0.12 sec)
mysql> insert into ConvertOutputtoUtf8Demo(Name,Age) values('Mike',27);
Query OK, 1 row affected (0.18 sec)
mysql> insert into ConvertOutputtoUtf8Demo(Name,Age) values('Sam',22);
Query OK, 1 row affected (0.15 sec)

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Display all records from the table using select statement. The query is as follows:

mysql> select *from ConvertOutputtoUtf8Demo;

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The following is the output:

+----+-------+------+
| Id | Name  | Age  |
+----+-------+------+
|  1 | John  | 24   |
|  2 | Larry | 21   |
|  3 | Carol | 26   |
|  4 | Mike  | 27   |
|  5 | Sam   | 22   |
+----+-------+------+
5 rows in set (0.00 sec)

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Here is the query to convert output of MySQL query to UTF8:

mysql> select Id,convert(Name using utf8) as ConvertToUtf8 from ConvertOutputtoUtf8Demo;

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The following is the output:

+----+---------------+
| Id | ConvertToUtf8 |
+----+---------------+
| 1 | John           |
| 2 | Larry          |
| 3 | Carol          |
| 4 | Mike           |
| 5 | Sam            |
+----+---------------+
5 rows in set, 1 warning (0.00 sec)

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You can use another query which is as follows:

mysql> SELECT Id,CONVERT(CAST(Name as BINARY) USING utf8) as ConvertToUtf8 FROM ConvertOutputtoUtf8Demo;

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The following is the output:

+----+---------------+
| Id | ConvertToUtf8 |
+----+---------------+
| 1 | John           |
| 2 | Larry          |
| 3 | Carol          |
| 4 | Mike           |
| 5 | Sam            |
+----+---------------+
5 rows in set, 1 warning (0.00 sec)

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