在做Maven时,才知道Oracle的驱动jar还要收费,所有Maven中央就没有需要自己安装,现在记录下来备用!
Oracle JDBC Driver Installation Notes
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Constraints and Indexes: Oracle offers various types of constraints, such as NOT NULL, PRIMARY KEY, UNIQUE, FOREIGN KEY, and CHECK, which ensure data integrity and consistency. Indexes speed up data retrieval.
Views and Synonyms: A view is a virtual table based on one or more tables, simplifying complex queries and protecting data. A synonym provides an alias for objects, allowing users to access different objects with the same name, improving database accessibility.
Transactions and Rollbacks: In Oracle, a transaction is a group of logical operations that must either all succeed or all fail, ensuring data consistency. Use COMMIT to commit a transaction, ROLLBACK to undo changes, and SAVEPOINT to set a rollback point.
SQL Utility Commands: Useful SQL commands include DESCRIBE (to view table structure), SELECT * FROM dual (for connection testing), SPOOL (to save query results to a file), SHOW (to display session settings), and HELP (to provide help information).
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