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Prepared reports and JDBC drivers

I have the following questions about prepared statements in Java.

  • Is Prepared Statements Useful If SQL Query Doesn't Have a Where Clause? Suppose a simple query Select * from tablename;

  • They say that a prepared statement is compiled once, and only the values ​​are replaced a second time. Therefore, it is faster, because the step of checking and compiling the request may be skipped. Where is the compiled form stored? What is the lifetime of this compiled form?

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2 answers

  • A PreparedStatement is beneficial when there are parameters that need to be passed, and when the request needs to be repeated. If there is a simple request that will be run once, the statement will work faster.

  • Caching occurs on the database server. The database server has APIs that help cache compiled queries. Therefore, to run the queries again, the same compiled query will run again and improve performance.

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  • Use PreparedStatement whenever there is input or more from the user. This will help you avoid the necessary characters to prevent SQL injection and query errors.
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