How can you retrieve data from the ResultSet?


How can you retrieve data from the ResultSet?

The ResultSet interface declares getter methods (for example, getBoolean and getLong ) for retrieving column values from the current row. You can retrieve values using either the index number of the column or the alias or name of the column. The column index is usually more efficient. Columns are numbered from 1.

Which method is used to retrieve the result set created in JDBC?


How does ResultSet work in Java?

A ResultSet object maintains a cursor that points to the current row in the result set. The term “result set” refers to the row and column data contained in a ResultSet object.

What is ResultSet next in Java?

The next() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the next row, from the current position. Statement stmt = con. createStatement(); ResultSet rs = stmt. And on calling the next() method for the second time the result set cursor will be moved to the 2nd row….

What is Type_scroll_insensitive in Java?

TYPE_SCROLL_INSENSITIVE means that the ResultSet can be navigated (scrolled) both forward and backwards. You can also jump to a position relative to the current position, or jump to an absolute position. The ResultSet is insensitive to changes in the underlying data source while the ResultSet is open….

How do you check if a ResultSet is empty?

The JDBC ResultSet doesn’t provide any isEmpty(), length() or size() method to check if its empty or not. Hence, when a Java programmer needs to determine if ResultSet is empty or not, it just calls the next() method and if next() return false it means ResultSet is empty….

What happens if you call the method close?

When you call close method of a connection objectStateChange event is fired, non – committed pending transactions are rolled back and connection is returned to the connection pool….

Which one is not a JDBC interface?

ConnectionPool is not a class of JDBC API. JDBC API consists of following interfaces and classes: DriverManager, Driver, Connection, Statement, ResultSet, SQLException.

What is correct about JDBC?

The JDBC API provides the abstraction and the JDBC drivers provide the implementation. New drivers can be plugged-in to the JDBC API without changing the client code. Q 13 – Which of the following is correct about JDBC? A – The JDBC API provides the abstraction and the JDBC drivers provide the implementation.

Which of the following step closes a connection with a database?

Q 7 – Which of the following step closes a connection with a database? A – Open a connection using the DriverManager. getConnection method. D – Clean up the environment by closing all database resources relying on the JVM’s garbage collection.

What is used to execute parameterized query?

PreparedStatement interface is used to execute parameterized query – JDBC. Q….

How can you execute a stored procedure in the database?

In Object Explorer, connect to an instance of the SQL Server Database Engine, expand that instance, and then expand Databases. Expand the database that you want, expand Programmability, and then expand Stored Procedures. Right-click the user-defined stored procedure that you want and click Execute Stored Procedure….

What is PreparedStatement in Java?

PreparedStatement is a class in java. sql package and allows Java programmers to execute SQL queries by using the JDBC package. You can get a PreparedStatement object by calling connection. prepareStatement() method. SQL queries passed to this method go to Database for pre-compilation if JDBC driver supports it….

Which object allows you to create parameterized queries?

The Statement interface provides methods to execute queries with the database. The statement interface is a factory of ResultSet; i.e., it provides the factory method to get the object of ResultSet. The PreparedStatement interface is a subinterface of Statement. It is used to execute the parameterized query.

Should prepared statement be closed?

Closing PreparedStatement Object If you close the Connection object first, it will close the PreparedStatement object as well. However, you should always explicitly close the PreparedStatement object to ensure proper cleanup.

Can we use same prepared statement for multiple queries?

5 Answers. Yes you can re-use a Statement (specifically a PreparedStatement ) and should do so in general with JDBC. It would be inefficient & bad style if you didn’t re-use your statement and immediately created another identical Statement object….

Which statement is used for calling the stored procedure?

callable statement

How you may create and call stored procedures in JDBC?

First, open a connection to MySQL server by creating a new Connection object. Then, prepare a stored procedure call and create a CallableStatement object by calling prepareCall() method of the Connection object. Next, pass all the parameters to the stored procedure.

Where are stored procedures stored?

A stored procedure (also termed proc, storp, sproc, StoPro, StoredProc, StoreProc, sp, or SP) is a subroutine available to applications that access a relational database management system (RDBMS). Such procedures are stored in the database data dictionary.

Which of the following is correct about stored procedures?

Q 9 – Which of the following is correct about stored procedures? A – A stored procedure is a group of SQL statements that form a logical unit and perform a particular task. B – Stored procedures can be called using CallableStatement class in JDBC API.

What is the need of stored procedure?

A stored procedure provides an important layer of security between the user interface and the database. It supports security through data access controls because end users may enter or change data, but do not write procedures.

What are stored procedures?

A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.

Which of the following is System procedure?

Which of the following is a system procedure? Explanation: sp_changeowner is used to change the owner of an database object.

What is System procedure?

Systems and procedures are crucial for your admin job, as well. You have a procedure for processing an expense report; you have a system for doing the monthly accounting. A procedure is simply one component of a larger system, and most systems are made up of a series of procedures….

How many stored procedures are in a database?

If you’re using sql 2005, a visual way to see your proc count is to navigate in SSMS to your stored procedure node under programmability. Click View-Object Explorer Details and a count of objects will be displayed on the right. If all your db access is mandated to be through SP’s, then the sky is the limit….

Can’t find stored procedure describe?

10 Answers You should not have to restart the database after adding a new stored procedure, although you will need to refresh your object explorer to see it there. The next time you add a stored procedure try running the right click execute option from the object explorer and enter your parameters and see if it runs.

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