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Home / Interview Subjects / JDBC

WithoutBook LIVE Mock Interviews JDBC Related interview subjects: 39

Interview Questions and Answers

Know the top JDBC interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 27 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top JDBC interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Ques 1

How do I retrieve warnings?

SQLWarning objects are a subclass of SQLException that deal with database access warnings. Warnings do not stop the execution of an
application, as exceptions do; they simply alert the user that something did not happen as planned. A warning can be reported on a
Connection object, a Statement object (including PreparedStatement and CallableStatement objects), or a ResultSet object. Each of these
classes has a getWarnings method, which you must invoke in order to see the first warning reported on the calling object:
SQLWarning warning = stmt.getWarnings();
if (warning != null)
{
System.out.println("n---Warning---n");
while (warning != null)
{
System.out.println("Message: " + warning.getMessage());
System.out.println("SQLState: " + warning.getSQLState());
System.out.print("Vendor error code: ");
System.out.println(warning.getErrorCode());
System.out.println("");
warning = warning.getNextWarning();
}
}

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Ques 2

What is the advantage of denormalization?

Data denormalization is reverse procedure, carried out purely for reasons of improving performance. It maybe efficient for a high-throughput system to replicate data for certain data.

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Related differences

JDBC vs HibernateJDBC vs Hibernate JDBC vs JPAJDBC vs JPA JDBC 3.0 vs JDBC 4.0JDBC 3.0 vs JDBC 4.0

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