pros-cons-storing-binary-files-database

sql-queries-10/pros-cons-storing-binary-files-database/enhance-security.sql

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+-- Apply permission
+USE University; 
+GRANT SELECT ON Course TO 'gbenga'@'localhost';

sql-queries-10/pros-cons-storing-binary-files-database/increase-database-size.sql

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+-- Query to calculate the size of each database in MySQL (in megabytes)
+SELECT table_schema 
+AS 'Database',
+ROUND(SUM(data_length + index_length) / 1024 / 1024, 6) AS 'Size in MB'
+FROM information_schema.TABLES
+GROUP BY table_schema;
+

sql-queries-10/pros-cons-storing-binary-files-database/performance-overhead.sql

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+-- Start timing the operation (precision: microseconds)
+SET @start = NOW(6);
+
+-- Export a textbook (stored as Base64 in DB) to a PDF file
+-- 1. FROM_BASE64() decodes the Base64 'textbook' column
+-- 2. INTO DUMPFILE writes the binary result to the server's filesystem
+-- 3. Restricted to MySQL's secure file directory (e.g., /var/lib/mysql-files/)
+SELECT FROM_BASE64(textbook) 
+INTO DUMPFILE '/var/lib/mysql-files/temp_restored.pdf' 
+FROM Course 
+WHERE id = 'ME438';
+
+-- End timming
+SET @end = NOW(6);
+
+-- Calculate and display the export duration in milliseconds
+-- TIMESTAMPDIFF computes microseconds, divided by 1000 for milliseconds
+SELECT CONCAT( 
+    TIMESTAMPDIFF(MICROSECOND, @start, @end)/1000, 'milliseconds') AS file_export_time;
+

sql-queries-10/pros-cons-storing-binary-files-database/storing-binary-files.sql

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+-- STORING BINARY FILES
+-- Modify textbook Column in Course Table to accept Binary Files
+ALTER TABLE Course MODIFY textbook LONGBLOB;
+
+
+-- INSERTING BINARY FILE INTO DATABASE
+-- Checking secure directory MySQL access
+SHOW VARIABLES LIKE 'secure_file_priv';
+
+-- INSERT SQL-Fundamental.pdf
+INSERT INTO Course (id, name, textbook, credits, is_active, department_id) 
+VALUES ('ME438', 'SQL-Fundamental', 
+    (SELECT TO_BASE64(LOAD_FILE('/var/lib/mysql-files/SQL-Fundamental.pdf'))), 7, 'Yes', 4);
+
+
+-- Retrieving Binary File
+SELECT FROM_BASE64(textbook) 
+INTO DUMPFILE '/var/lib/mysql-files/LinuxCourse_restored.pdf' 
+FROM Course 
+WHERE id = 'CS108';
+

sql-queries-10/pros-cons-storing-binary-files-database/transactional-integrity.sql

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+-- Start the transaction
+START TRANSACTION; 
+
+-- Insert the pdf binary file into Course Table - textbook column
+INSERT INTO Course (id, name, textbook, credits, is_active, department_id) 
+VALUES ('ME439', 'SQL-Fundamental-2', (SELECT TO_BASE64(LOAD_FILE('/var/lib/mysql-files/LinuxCourse_restored.pdf'))), 10, 'No', 4); 
+
+--  Update Department Table
+UPDATE Department 
+SET course_count = course_count + 1 
+WHERE id = 4; 
+
+--  Commit to complete the transaction
+COMMIT;