CallableStatement interface is used to call the stored procedures and functions. We can have business logic on the database by the use of stored procedures and functions that will make the performance better because these are precompiled.

What is the use of CallableStatement in Java?

CallableStatement is used to execute SQL stored procedures. JDBC provides a stored procedure SQL escape that allows stored procedures to be called in a standard way for all RDBMS’s. This escape syntax has one form that includes a result parameter and one that does not.

Why would one use CallableStatement over PreparedStatement?

It is used when you want to use the database stored procedures. CallableStatement can accept runtime input parameters.
Difference between CallableStatement and PreparedStatement :

CallableStatement PreparedStatement
Performance is very high. Performance is better than Statement.

How we can use CallableStatement?

Following are the steps to use Callable Statement in Java to call Stored Procedure:

  1. Load MySQL driver and Create a database connection. import java.sql.*; …
  2. Create a SQL String. We need to store the SQL query in a String. …
  3. Create CallableStatement Object. …
  4. Set The Input Parameters. …
  5. Call Stored Procedure.

What is difference between PreparedStatement and CallableStatement?

1) Statement – Used to execute normal SQL queries. 2) PreparedStatement – Used to execute dynamic or parameterized SQL queries. 3) CallableStatement – Used to execute the stored procedures.

What is difference between execute and executeUpdate?

Statement interface of JDBC which are used to execute SQL statements. executeQuery() command used for getting the data from database whereas executeUpdate() command used for insert,update,delete or execute() command used forany kind of operations.

What is difference between PreparedStatement and statement interface?

The Key Difference between Statement and PreparedStatement is that Statement is used for executing simple SQL Statements whereas PreparedStatement is used for executing dynamic and pre-compiled SQL Statements.

Which method is used to create a CallableStatement object?

prepareCall method

The prepareCall method is used to create new CallableStatement objects. As with the prepareStatement method, the SQL statement must be supplied at the time that the CallableStatement object is created. At that time, the SQL statement is precompiled.

Why are prepared statements faster?

Prepared statements are much faster when you have to run the same statement multiple times, with different data. Thats because SQL will validate the query only once, whereas if you just use a statement it will validate the query each time.

Which of the following is correct about CallableStatement?

Q 4 – Which of the following is correct about CallableStatement? A – Used when you want to access the database stored procedures.

How do you get ResultSet from CallableStatement?

Retrieving Results from a procedure:

CallableStatement cstmt = con. prepareCall(“{call sampleProcedure()}”); Execute the above created callable statement using the executeQuery() method this returns a result set object. //Executing the CallableStatement ResultSet rs1 = cstmt.

Do we need to close PreparedStatement in Java?

Yes, you have to close the prepared statements ( PreparedStatement Object) and result sets as they may cause memory leakage.

What is the purpose of setAutoCommit false in JDBC means?

setAutoCommit(false) will allow you to group multiple subsequent Statement s under the same transaction. This transaction will be committed when connection. commit() is invoked, as opposed to after each execute() call on individual Statement s (which happens if autocommit is enabled).

What is the use of setAutoCommit method?

In this scenario you can use the setAutoCommit() method. This method belongs to the Connection interface and, it accepts a boolean value. If you pass true to this method it turns on the auto-commit feature of the database and, if you pass false to this method it turns off the auto-commit feature of the database.

What is the use of setAutoCommit method in Java?

The getAutocommit() method of the Connection interface is used to get the current value of the auto-commit in this connection. con. getAutoCommit(); Following JDBC program establishes a connection with the database and turns off the auto-commit and retrieves the current auto-commit value (which is false ).

What is the purpose of setAutoCommit false Mcq?

What does setAutoCommit(false) do? Explanation: setAutoCommit(false) does not commit transaction automatically after each query. That saves a lot of time of the execution and hence improves performance.

What is Savepoint in Java?

A Savepoint object is used to save the current state of the database which can be rolled-back afterwards to that state of the database. Savepoints are similar to the SQL Transactions and are generally to rollback if something goes wrong within the current transaction. The connection.

Why will you set auto commit mode to false?

By default, new connections are in autocommit mode. … When the autocommit mode is false, the JDBC driver will implicitly start a new transaction after each commit. If this method is called during a transaction, the transaction is committed.

Which is faster and uses less memory in Java?

Which is faster and uses less memory? Enumeration is very basic and meets basic needs.

How can a dead thread be restarted?

Since a Thread can not be restarted you have to create a new Thread everytime. A better practice is to separate the code to run in a thread from a Thread ‘s lifecycle by using the Runnable interface. Just extract the run method in a class that implements Runnable . Then you can easily restart it.

What is difference between ArrayList and Vector in Java?

ArrayList is non-synchronized. Vector is synchronized. ArrayList increments 50% of its current size if element added exceeds its capacity. Vector increments 100% of its current size if element added exceeds its capacity.

What decides thread priority?

Explanation: Thread scheduler decides the priority of the thread execution.

Can two threads have same priority?

It is possible to have same priority to threads. So CPU can decide which thread to run by using some algorithms.

Which thread will execute first?

Overview of Thread Execution

All Java threads have a priority, and the JVM serves the one with the highest priority first. When we create a Thread, it inherits its default priority. When multiple threads are ready to execute, the JVM selects and executes the Runnable thread that has the highest priority.