JDBC executeUpdate() And executeQuery()
In this tutorial you will learn about executeQuery(), and executeUpdate() mehod
In this tutorial you will learn about executeQuery(), and executeUpdate() mehodStatement executeQuery() and executeUpdate() Example
executeQuery() method is used mostly for SELECT statement and it returns the in form of ResultSet object.
executeUpdate() method is generally used by INSERT, UPDATE, And DELETE statements. When table updated successfully then it returns 1.
An example given below illustrates the use of these methods
JDBCEexecuteExample.java
package roseindia.net;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCEexecuteExample {
public static void main(String[] args) throws SQLException {
Connection connection = null; // connection reference variable for
// getting
// connection
Statement statement = null; // Statement reference variable for query
// Execution
ResultSet resultSet = null; // ResultSet reference variable for saving
// query
// result
String conUrl = "jdbc:mysql://localhost:3306/";
String driverName = "com.mysql.jdbc.Driver";
String databaseName = "student";
String usrName = "root";
String usrPass = "root";
try {
// Loading Driver
Class.forName(driverName);
} catch (ClassNotFoundException e) {
System.out.println(e.toString());
}
try {
// Getting Connection
connection = DriverManager.getConnection(conUrl + databaseName,
usrName, usrPass);
// setting connection autocommit false
connection.setAutoCommit(false);
// Getting reference to connection object
statement = connection.createStatement();
// creating Query String
String updateQuery = "UPDATE student SET NAME='Rajan' WHERE RollNo=1";
String selectQuery = "SELECT * FROM student";
String insertQuery = "INSERT INTO student values(4,'Rohan','MCA','Mumbai')";
String deleteQuery = "DELETE FROM student WHERE RollNo=4";
// Insert Query
statement.executeUpdate(insertQuery);
// Updating Query
int result = statement.executeUpdate(updateQuery);
if (result == 1) {
System.out.println("Table Updated Successfully.......");
}
// Delete Query
statement.executeUpdate(deleteQuery);
// excecuting query
resultSet = statement.executeQuery(selectQuery);
while (resultSet.next()) {
// Didplaying data of tables
System.out.println("Roll No " + resultSet.getInt("RollNo")
+ ", Name " + resultSet.getString("Name") + ", Course "
+ resultSet.getString("Course") + ", Address "
+ resultSet.getString("Address"));
}
} catch (Exception e) {
System.out.println(e.toString());
} finally {
// Closing connection
resultSet.close();
statement.close();
connection.close();
}
}
}
When you run this application it will display message as shown below:| Table Updated Successfully....... Roll No 1, Name Rajan, Course MCA, Address Motihari Roll No 3, Name Rohan, Course MCA, Address Mumbai |
