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How to convert an image to base64 encoding?
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Here is the code for upload to encode and save it to the MySQL
if (!isset($_GET["getfile"])) {
if ($_FILES["file"]["error"] > 0) {
echo "Error: " . $_FILES["file"]["error"] . "<br>";
} else {
move_uploaded_file($_FILES["file"]["tmp_name"], $_FILES[...
MySQL OPTIMIZE all tables?
MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself?
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How to remove constraints from my MySQL table?
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Mysql has a special syntax for dropping foreign key constraints:
ALTER TABLE tbl_magazine_issue
DROP FOREIGN KEY FK_tbl_magazine_issue_mst_users
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Troubleshooting “Illegal mix of collations” error in mysql
...g the below error when trying to do a select through a stored procedure in MySQL.
16 Answers
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App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
... 发送和接收文本 (URSAI2UDPTest)
此示例展示了如何发送和接收文本。
示例中的块并不难理解。大多数块涉及输入项的验证。
发送和接收字节数组 (UDPBinaryTest)
此示例展示了如何发送和接收字节...
How to change collation of database, table, column?
...ame != 'utf8_general_ci' AND table_schema not in ('information_schema','mysql', 'performance_schema','sys');
– William Entriken
Dec 12 '19 at 19:56
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ImportError: No module named MySQLdb
...sion, or on a platform where you cant, you can try using the pure python PyMySQL bindings.
Simply pip install pymysql and switch your SQLAlchemy URI to start like this:
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://.....'
There are some other drivers you could also try.
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java.sql.SQLException: Incorrect string value: '\xF0\x9F\x91\xBD\xF0\x9F…'
...rs and one will see squares if you are not using fonts that support them.
MySQL's utf8 only supports basic multilingual plane, and you need to use utf8mb4 instead:
For a supplementary character, utf8 cannot store the character at all,
while utf8mb4 requires four bytes to store it. Since utf8 ...
Activity启动器（ActivityStarter）如何查看并启动其他App · App Inventor 2 中文网
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Activity启动器（ActivityStarter）如何查看并启动其他App
App包名和类名的查看
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App包名和类名的查看
由 App Inventor 2 创建的应用要弄...
如何实现设置用户头像功能呢？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
在inventor中如何实现调用相册功能选择图片设置成用户头像功能呢，就是类似于微信中点击头像会弹出从相册中选择或者拍照来设置头像的功能
多媒体下面的组件可以实现，具体用法参考中文文档：https://www.fun123.cn/reference/comp...