JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to execute any type of query in JDBC?


Description:

The Statement.execute() method allows us to execute any kind of query like select, update. It returns boolean. If the return value is true, then it executed select query, get the ResultSet object and read the resulted records. If it returns false, then it can be update query, call getUpdateCount() method to get total records updated. Check the below sample code:


Code:
package com.java2novice.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class MyExecuteMethod {

	public static void main(String a[]){
		
		Connection con = null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			con = DriverManager.
					getConnection("jdbc:oracle:thin:@<hostname>:<port num>:<DB name>"
						,"user","password");
			Statement stmt = con.createStatement();
			//The query can be update query or can be select query
			String query = "select * from emp";
			boolean status = stmt.execute(query);
			if(status){
				//query is a select query.
				ResultSet rs = stmt.getResultSet();
				while(rs.next()){
					System.out.println(rs.getString(1));
				}
				rs.close();
			} else {
				//query can be update or any query apart from select query
				int count = stmt.getUpdateCount();
				System.out.println("Total records updated: "+count);
			}
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally{
			try{
				if(con != null) con.close();
			} catch (Exception ex){}
		}
	}
}
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List Of All JDBC Programs:

  1. How to create JDBC Connection?
  2. What is Statement & ResultSet in JDBC?
  3. How to execute and read select queries using JDBC?
  4. How to update a record in the database using JDBC?
  5. How to execute any type of query in JDBC?
  6. What are the types of JDBC Statements available?
  7. Write an example code for JDBC prepared statement.
  8. Write an example for JDBC prepared statement with ResultSet.
  9. How to get primary key value (auto-generated keys) from inserted queries using JDBC?
  10. Write a simple program for CallableStatement statement to execute stored procedure.
  11. Write a program for CallableStatement statement with stored procedure returns OUT parameters.
  12. Write a program for CallableStatement statement with batch execution.
  13. Write a program to execute SQL function using CallableStatement.
  14. Write a program to execute SQL cursors using CallableStatement.
  15. How to get column properties from ResultSet using ResultSetMetaData?
  16. Write an example for batch update using Statement.
  17. Write an example for batch update using PreparedStatement.
  18. What are the types of ResultSets in JDBC?
  19. Write an example for scrollable result set with read only mode.
  20. Write an example for updatable result set.
  21. How to insert an image into database table? or Write an example for inserting BLOB into table.
  22. How to read an image from database table? or Write an example for reading BLOB from table.
  23. What is DatabaseMetaData? Write an example code.
  24. How to get JDBC Connection object using properties file?
Knowledge Centre
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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