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How to retrieve a record from an existing table in oracle database using JDBC API?
You can update/modify the existing contents of a record in a table using the UPDATE query. Using this you can update all the records of the table or specific records.
Syntax
UPDATE table_name SET column1 = value1, column2 = value2...., columnN = valueN WHERE [condition];
To update the contents of a record in a table using JDBC API you need to −
Register the Driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.
Establish a connection: Connect to the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.
Create Statement: Create a Statement object using the createStatement() method of the Connection interface.
Execute the Query: Execute the query using the executeUpdate() method of the Statement interface.
Let us create a table with name dispatches in Oracle database using CREATE statement as shown below −
CREATE TABLE Dispatches( PRODUCTNAME VARCHAR2(20), CUSTOMERNAME VARCHAR2(20), DISPATCHDATE DATE, DELIVERYTIME TIMESTAMP(6), PRICE NUMBER(38), LOCATION VARCHAR2(20) );
Now, we will insert 5 records in dispatches table using INSERT statements −
insert into dispatches values('Key-Board', 'Raja', TO_DATE('2019-09-01', 'yyyy/mm/dd'), TO_DATE('11:00:00', 'hh:mi:ss'), 7000, 'India');
insert into dispatches values('Earphones', 'Roja', TO_DATE('2019-05-01', 'yyyy/mm/dd'), TO_DATE('11:00:00', 'hh:mi:ss'), 2000, 'Vishakhapatnam');
insert into dispatches values('Mouse', 'Puja', TO_DATE('2019-03-01', 'yyyy/mm/dd'), TO_DATE('10:59:59', 'hh:mi:ss'), 3000, 'Vijayawada');
insert into dispatches values('Mobile', 'Vanaja', TO_DATE('2019-03-01', 'yyyy/mm/dd'), TO_DATE('10:10:52', 'hh:mi:ss'), 9000, 'Chennai');
insert into dispatches values('Headset', 'Jalaja', TO_DATE('2019-04-06', 'yyyy/mm/dd'), TO_DATE('11:08:59', 'hh:mi:ss' ), 6000, 'Goa');Following JDBC program establishes connection with the Oracle database and increases the prices of each product by 3000.
Example
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class UpdateRecordsExample {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
//Getting the connection
String oracleUrl = "jdbc:oracle:thin:@localhost:1521/xe";
Connection con = DriverManager.getConnection(oracleUrl, "system", "password");
System.out.println("Connection established......");
//Creating the Statement
Statement stmt = con.createStatement();
//Query to update records, Increasing the price of all items by 3000
String query = "Update dispatches set PRICE = PRICE+3000";
//Executing the query
int i = stmt.executeUpdate(query);
System.out.println("Rows updated: "+i);
System.out.println("Contents of the dispatches table after updating the records: ");
//Retrieving data
ResultSet rs = stmt.executeQuery("Select * from dispatches");
while(rs.next()) {
System.out.print("Name: "+rs.getString("ProductName")+", ");
System.out.print("Customer Name: "+rs.getString("CustomerName")+", ");
System.out.print("Dispatch Date: "+rs.getDate("DispatchDate")+", ");
System.out.print("Delivery Time: "+rs.getTime("DeliveryTime")+", ");
System.out.print("Price: "+rs.getInt("Price")+", ");
System.out.print("Location: "+rs.getString("Location"));
System.out.println();
}
}
}Output
Connection established...... Rows updated: 5 Contents of the dispatches table after updating the records: Name: Key-Board, Customer Name: Raja, Dispatch Date: 2019-09-01, Delivery Time: 11:00:00, Price: 10001, Location: Hyderabad Name: Earphones, Customer Name: Roja, Dispatch Date: 2019-05-01, Delivery Time: 11:00:00, Price: 5000, Location: Vishakhapatnam Name: Mouse, Customer Name: Puja, Dispatch Date: 2019-03-01, Delivery Time: 10:59:59, Price: 6000, Location: Vijayawada Name: Mobile, Customer Name: Vanaja, Dispatch Date: 2019-03-01, Delivery Time: 10:10:52, Price: 12001, Location: Chennai Name: Headset, Customer Name: Jalaja, Dispatch Date: 2019-04-06, Delivery Time: 11:08:59, Price: 9000, Location: Goa
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