How to Solve Chinese Character Insertion Problems in MySQL Databases?

Unicode: Resolving Chinese Character Insertion Issues in MySQL

Inserting Chinese characters into a MySQL database can be a challenge, especially when the encoding of the data is not compatible with the database's character set. This can occur when the cookie encoding, such as Big5, does not match the database's UTF-8 character set.

Solution:

To resolve this issue, follow these steps:

1. Create Table with UTF-8 Character Set:

   • When creating the database table that will store the Chinese characters, specify the character set as UTF-8. This ensures that the table can handle Unicode characters.
   • Example: CREATE TABLE table_name (username VARCHAR(20) CHARACTER SET utf8, reason TEXT CHARACTER SET utf8)

2. Insert Data Using UTF-8 Encoding:

   • When inserting Chinese characters into the table, use the following syntax:
   • Example: INSERT INTO table_name (username, reason) VALUES ('$username', '$_COOKIE["reason"]')

Additional Tips:

• Use the mysql_set_charset() function to explicitly set the character encoding for the connection.
• Check the column definitions in the database to ensure they are using the correct character set and collation.
• If you encounter any errors related to character encoding, refer to the MySQL documentation for more information.

Detailed Code Example:

<code class="php">$db = new mysqli("localhost", "root", "", "stackoverflow");
$db->set_charset("utf8");

$username = $_POST['username'];
$reason = $_POST['reason'];

// Check if the username exists in the database
$sql = "SELECT username FROM table_name WHERE username = '$username'";
$result = $db->query($sql);

if ($result->num_rows > 0) {
    // Update the reason for the existing username
    $sql = "UPDATE table_name SET reason = '$reason' WHERE username = '$username'";
} else {
    // Insert a new user and reason into the database
    $sql = "INSERT INTO table_name (username, reason) VALUES ('$username', '$reason')";
}

// Execute the SQL query
$db->query($sql);</code>

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