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statement 和 prepared statement?

Statement每次执行sql语句,数据库都要执行sql语句的编译. 最好用于仅执行一次查询并返回结果的情形，效率高于PreparedStatement.

Prepared statements offer better performance, as they are pre-compiled. Use when you plan to use the SQL statements many times.

Prepared statements are more secure because they use bind variables, which can prevent SQL injection attack.

Continuous integration
Callable statement?
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statement 和 prepared statement?

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