How Can You Retrieve Information From A ResultSet?

Invoke the

Statement. executeQuery method

to obtain the result table from the SELECT statement in a ResultSet object. In a loop, position the cursor using the next method, and retrieve data from each column of the current row of the ResultSet object using getXXX methods.

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.

How can you retrieve information from a ResultSet in Mcq?

6. How can you retrieve information from a ResultSet? c.

By invoking the method getValue(…), and cast the result to the desired Java type

.

Which method is used to retrieve the ResultSet created in JDBC?

Every ResultSet object is associated with one ResultSetMetaData object. This object will have the details of the properties of the columns like datatype of the column, column name, number of columns, table name, schema name, etc., We can get the ResultSetMetaData object using the

getMetaData() method

of ResultSet.

What is ResultSetMetaData in Java?

The ResultSetMetaData

provides information about the obtained ResultSet object

like, the number of columns, names of the columns, datatypes of the columns, name of the table etc… Following are some methods of ResultSetMetaData class.

Can you explain how do you retrieve data from database in Java Please explain all steps?

1. import java.io.*;
2. import java.sql.*;
3. public class RetrieveFile {
4. public static void main(String[] args) {
5. try{
6. Class.forName(“oracle.jdbc.driver.OracleDriver”);
7. Connection con=DriverManager.getConnection(

How can we connect to database in a web application?

1. Expand the JDBC node.
2. Select the JDBC Resources node.
3. Click the New… button.
4. Type jdbc/BookDB in the JNDI Name field.
5. Choose PointBasePool for the Pool Name.
6. Click OK.

How can we connect to database in a Web application Mcq?

How can we connect to database in a web application? Explanation:

JDBC template can be used

to connect to database and fire queries against it.

What is the use of rollback method in JDBC Mcq?

Explanation: rollback() method is used to

rollback the transaction

. It will rollback all the changes made by the transaction. 10.

What JDBC means?

The

Java Database Connectivity

(JDBC) API provides universal data access from the Java programming language.

What is result in Java?

Java SDK. Result objects are

wrapper objects that indicate whether or not the API call was a success

and, if successful, include the requested data. API calls that don’t have validations, such as searches, will return a collection of requested objects instead of a result object.

Which method of the ResultSet is used to determine whether a value retrieved is null or not?

The wasNull() method

of the ResultSet interface determines whether the last column read had a Null value.

Which method is used to fetch the result from database and assign it to ResultSet object execute?

The

Statement interface

provides methods to execute queries with the database. The statement interface is a factory of ResultSet i.e. it provides factory method to get the object of ResultSet.

How do you find the information about columns in a ResultSet object?

You can get the column count in

a table using the getColumnCount() method of the ResultSetMetaData interface

. On invoking, this method returns an integer representing the number of columns in the table in the current ResultSet object.

What is a database metadata?

Metadata is

data about data

(see those examples to better understand this concept). … In case of relational databases metadata refers to information on their schema and all the other information regarding access, storage, built in programs or any other information about database elements or usage.

What is database metadata in Java?

DatabaseMetaData interface provides

methods to get meta data

of a database such as database product name, database product version, driver name, name of total number of tables, name of total number of views etc.

How do you retrieve data from a database?

1. Start by creating a new app.
2. Add a Screen to your app. …
3. Add data sources to your app by referencing some Entities in the Manage Dependencies window (Ctrl+Q). …
4. Publish the app by clicking the 1-Click Publish button. …
5. It’s time to load some data to the Screen.

Can you access a database using the Internet?

People can open the web database in Access

, and then use the client objects. This is an effective way to share a database, and also opens new opportunities for working together over the Web.

How can we retrieve data from database using servlet?

1. import java.io.*;
2. import javax.servlet.*;
3. import javax.servlet.http.*;
4. import java.sql.*;
5. public class display extends HttpServlet.
6. {
7. public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException.
8. {

How do you query a database in Java?

1. Create a Java Connection to the MySQL database.
2. Define the SELECT statement.
3. Execute the SELECT query, getting a Java ResultSet from that query.
4. Iterate over the ResultSet , getting the database fields (columns) from each row of data that is returned.
5. Close the Java database connection.

How can we connect to database in a Web application in Java?

1. import java.sql.*;
2. class MysqlCon{
3. public static void main(String args[]){
4. try{
5. Class.forName(“com.mysql.jdbc.Driver”);
6. Connection con=DriverManager.getConnection(
7. //here sonoo is database name, root is username and password.
8. Statement stmt=con.createStatement();

How do you create a database for a website?

1. Next, you will name your database and it will appear in your databases list.
2. For the next example and throughout the guide, we are going to use a database that includes a “user” table and a “car” table.

Which is responsible for getting connection to database?

Explanation:

The Driver interface

is responsible for getting a connection to the database, making Option A the answer. The Connection interface is responsible for communication with the database but not making the initial connection.

Which is responsible for getting a connection to the database Mcq?

Driver: The

database communications link

, handling all communication with the database. Connection: Interface with all methods for contacting a database. Statement: Encapsulates an SQL statement which is passed to the database to be parsed, compiled, planned, and executed.

Which interface is used to access information about the database?

A database management system (DBMS) interface

is a user interface which allows for the ability to input queries to a database without using the query language itself.

How does JDBC handle the data types of Java and database Mcq?

Q 2 – How does JDBC handle the data types of Java and database? A –

The JDBC driver converts the Java data type to the appropriate JDBC type before sending it to the database

.

What is Open database?

An open source database has

code that is open and free for download, modification and re-use

. This is the opposite of a proprietary or closed source database in which the code is protected to prevent copying.

What does a database contain?

The information in many databases consists of

natural-language texts of documents

; number-oriented databases primarily contain information such as statistics, tables, financial data, and raw scientific and technical data. Small databases can be maintained on personal-computer systems and used by individuals at home.

How does JDBC connect to database?

The main objects of the JDBC API include: A

DataSource object is used to establish connections

. Although the Driver Manager can also be used to establish a connection, connecting through a DataSource object is the preferred method. A Connection object controls the connection to the database.

Which of the following interface provides the commit () and rollback () methods?

The Connection interface

is a factory of Statement, PreparedStatement, and DatabaseMetaData i.e. object of Connection can be used to get the object of Statement and DatabaseMetaData. The Connection interface provide many methods for transaction management like commit(), rollback() etc.

How does JDBC handle the data types of Java and database?

The

JDBC driver converts the Java data type to the appropriate JDBC type

, before sending it to the database. It uses a default mapping for most data types. For example, a Java int is converted to an SQL INTEGER. … JDBC 3.0 has enhanced support for BLOB, CLOB, ARRAY, and REF data types.

Which method is used to execute a SQL SELECT statement and returns a results?

The “execute” method

executes a SQL statement and indicates the form of the first result. You can then use getResultSet or getUpdateCount to retrieve the result, and getMoreResults to move to any subsequent result(s). getResultSet returns the current result as a ResultSet.

How does ResultSet work in Java?

A ResultSet is a Java object that contains

the results of executing an SQL query

. In other words, it contains the rows that satisfy the conditions of the query. The data stored in a ResultSet object is retrieved through a set of get methods that allows access to the various columns of the current row.

What is a ResultSet in SQL?

An SQL result set is

a set of rows from a database

, as well as metadata about the query such as the column names, and the types and sizes of each column. Depending on the database system, the number of rows in the result set may or may not be known. … A result set is effectively a table.

How do you create a ResultSet object in Java?

1. import java.sql.*;
2. class FetchRecord{
3. public static void main(String args[])throws Exception{
4. Class.forName(“oracle.jdbc.driver.OracleDriver”);
5. Connection con=DriverManager.getConnection(“jdbc:oracle:thin:@localhost:1521:xe”,”system”,”oracle”);

What is the result of 1 in Java?

There’s no such thing

as a “Java result 1” error. The only thing this can mean in your context is that the application is terminating with a status code of 1, which means it’s hitting one of the System. exit(1) lines of your code.

What is result class in Java?

The Result class

represents the outcome of an operation that might fail

. It contains either a value that represents the positive outcome of such operation, or an error String. [ 2]

Which of the following method in the ResultSet is used to retrieve date values?

From the obtained result set object get the date value (along with other values) using the

getDate() method

of the ResultSet interface.

How can you tell if a record is last ResultSet?

The

isAfterLast() method of the ResultSet interface

is used to determine whether the cursor is on the last row of the ResultSet. rs. isLast(); This method returns an boolean this value is true, if the cursor is on the last row of the ResultSet else, it returns false.

Which of the following methods is used to check whether ResultSet object contains records?

The next() method

of the ResultSet interface moves the pointer of the current (ResultSet) object to the next row, from the current position. This method returns a boolean value specifying whether the ResultSet object contains more rows.

How can you retrieve information from a ResultSet in Mcq?

6. How can you retrieve information from a ResultSet? c.

By invoking the method getValue(…), and cast the result to the desired Java type

.

How do I get metadata from ResultSet?

The ResultSetMetaData provides information about the obtained ResultSet object like, the number of columns, names of the columns, datatypes of the columns, name of the table etc… The

getMetaData() method of ResultSet interface

retrieves the ResultSetMetaData object of the current ResultSet.

How do you count records in ResultSet?

On contrary to this, getting the total number of counts is easy from ResultSet, just

use the ResultSetMetaData object from ResultSet and call the getColumnCount() method

. It returns an integer, which is equal to a total number of columns.