When using the database,
sometimes Chinese characters are displayed as question marks. This is usually caused by the following reasons:
Character set mismatch
The character set mismatch between the database and the client will cause Chinese characters to be garbled. For example, if the database uses the GBK character set and the client uses the UTF-8 character set, Chinese data will become question marks when displayed on the client.
Solution:
Make sure that the database and the client use the same character set.
Specify the character set when Online Calling Card connecting to the database. For example, in MySQL, you can use the SET
CHARACTER SET utf8; command to set the character set.
Use the character set conversion function in the code to convert the data to the correct character set. For example, in PHP, you can use the iconv() function to convert data from GBK to UTF-8.
The database table or field does not specify the character set
If the database table or field CRAFTING COMPELLING LEAD GENERATION does not specify the character set, the database will use the server’s character set by default. If the server’s character set does not match the client’s character set, Chinese characters will be garbled.
Solution:
Specify the character set when creating a database table or field.
For example, in MySQL, you can use the CREATE TABLE table_name (column_name VARCHAR(255) CHARACTER SET utf8); command to create a table and specify the character set.
Use the ALTER TABLE statement to modify the character set of an existing table. For example, in MySQL, you can use the ALTER TABLE table_name MODIFY column_name VARCHAR(255) CHARACTER SET utf8; command to modify the character set of a table.
There is a problem with the data itself
If there is a problem with the data itself, such as data corruption or incorrect encoding, it may also cause Chinese to be displayed as question marks.
Solution:
Check whether the data is corrupted or incorrectly encoded.
Repair the corrupted data or re-encode the incorrect data.
The database version is too low
Some older versions of the database may have defects in character set processing, resulting in garbled Chinese.
Solution:
Upgrade to the latest version of the database.
Third-party library or driver problems
Some third-party libraries or drivers may have defects in character set processing, resulting in garbled Chinese characters.
Solution:
Use the official library or driver.
Update the library or driver to the latest version.
Summary
When Chinese characters are displayed as question marks in the database, it is usually caused by character set mismatch, database table or field not specifying character set, data problems, low database version, or third-party library or driver problems. You can take appropriate solutions according to the specific situation.
Here are some additional suggestions:
Before using the database, please read the database documentation carefully to understand its character set settings and processing instructions.
Using character set conversion functions in the code can effectively prevent Chinese garbled characters.
Regularly updating the database, library, and driver to the latest version can reduce the risk of character set problems.
