JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Write an example for batch update using PreparedStatement.


Description:

Batch update is nothing but executing set of queries at a time. Batch updates reduces number of database calls. In batch processing, batch should not contain select query. When we are using PreparedStatement to execute batch update, we have to run the same query multiple times. Below examples shows how to do batch updates with PreparedStatement.


Code:
package com.java2novice.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class MyBatchPreparedStmt {

	public static void main(String a[]){
		
		Connection con = null;
		PreparedStatement pst = null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			con = DriverManager.
					getConnection("jdbc:oracle:thin:@<hostname>:<port num>:<DB name>"
						,"user","password");
			con.setAutoCommit(false);
			pst = con.prepareStatement("update emp set sal=? where empid=?");
			pst.setInt(1, 3000);
			pst.setInt(2, 200);
			pst.addBatch();
			pst.setInt(1, 4000);
			pst.setInt(2, 230);
			pst.addBatch();
			int count[] = pst.executeBatch();
			for(int i=1;i<=count.length;i++){
				System.out.println("Query "+i+" has effected "+count[i]+" times");
			}
			con.commit();
		} catch (ClassNotFoundException e) {
			try {
				con.rollback();
			} catch (SQLException e1) {
				e1.printStackTrace();
			}
			e.printStackTrace();
		} catch (SQLException e) {
			try {
				con.rollback();
			} catch (SQLException e1) {
				e1.printStackTrace();
			}
			e.printStackTrace();
		} finally{
			try{
				if(pst != null) pst.close();
				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
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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