¿Qué es el tipo de datos BLOB en MySQL?

What is BLOB data type in mysql?

A BLOB is a binary large object that can hold a variable amount of data. The four BLOB types are TINYBLOB , BLOB , MEDIUMBLOB , and LONGBLOB . They have the binary character set and collation, and comparison and sorting are based on the numeric values of the bytes in column values.

You cannot update a Blob directly. You must create a new Blob, read the old Blob data into a buffer where you can edit or modify it, then write the modified data to the new Blob.

A blob is a data type that can store binary data. This is different than most other data types used in databases, such as integers, floating point numbers, characters, and strings, which store letters and numbers. Since blobs can store binary data, they can be used to store images or other multimedia files.

USAGE OF BLOB : You can write a binary large object ( BLOB ) to a database as either binary or character data, depending on the type of field at your data source. To write a BLOB value to your database, issue the appropriate INSERT or UPDATE statement and pass the BLOB value as an input parameter.

Assume the following simple table: it will show, that the result looks like a table with one column named BulkColumn. That’s why you can use it in INSERT like: The rest is just fitting it into an insert with more columns, which your table may or may not have.

You can then this to INSERT by doing an INSERT SELECT. You can also use the second version to do an UPDATE as I described in How To Update A BLOB In SQL SERVER Using TSQL . to see it in management application in hex form (Management Studio).

To insert a VARCHAR2 into a BLOB column you can rely on the function utl_raw.cast_to_raw as next: insert into mytable (id, myblob) values (1, utl_raw.cast_to_raw (‘some magic here’)); It will cast your input VARCHAR2 into RAW datatype without modifying its content, then it will insert the result into your BLOB column.

The Azure Blob storage location is configured as an external data source. This requires a database scoped credential using a shared access signature that is encrypted using a master key in the user database.