Change Column Name of a Table

This section provides you an example with code for renaming a column name in a database table.

Change Column Name of a Table

Change Column Name of a Table

     

This section provides you an example with code for renaming a column name in a database table. As we know that each table keeps contents in rows and column format. While making a table we specify the name of each column which we want to add in the table. But later it may be that we need to change the name of the particular column. So, please don't panic. Here at roseindia.net, we have the answer of each and every thing. Brief description of the program is given below:

Description of program:

Firstly this program establishes the connection by using the JDBC driver with the database. After establishing the connection we will give the table name, old column name which we want to rename, new column name and it's data type. After that you will see that the column name has been renamed. If column name gets renamed column then the message we displaying is "Query OK, n rows affected" and if any problem arises in the SQL statement then it shows "Wrong entry!".

Description of code:

ALTER TABLE   table_name   CHANGE   old_col  new_col  data_type:
This query is fired to change the specific column name. It takes appropriate arguments:
  table_name: This is a name of the table in which we have to change the column name.
  old_col: The old column name that you want to change.
  new_col: The new column name 
 
   data_type: This is a data type of new column.

Here is the code of program:

import java.io.*;
import java.sql.*;

public class ChangeColumnName{
  public static void main(String[] args) {
  System.out.println("Change column name in a database table example!");
  Connection con = null;
  try{
  Class.forName("com.mysql.jdbc.Driver");
  con = DriverManager.getConnection
("jdbc:mysql://localhost:3306/jdbctutorial","root","root");
  try{
  Statement st = con.createStatement();
  BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter table name:");
  String table = bf.readLine();
  System.out.println("Enter old column name:");
  String old_col = bf.readLine();
  System.out.println("Enter new column:");
  String new_col = bf.readLine();
  System.out.println("Enter data type:");
  String type = bf.readLine();
  int n = st.executeUpdate
("ALTER TABLE "+table+" CHANGE "+old_col+" "+new_col+" "+type);
  System.out.println("Query OK, "+n+" rows affected");
  }
  catch (SQLException s){
  System.out.println("Wrong entry!");
  }
  }
  catch (Exception e){
  e.printStackTrace();
  }
  }
} 

Database Table: Student 

Stu_roll Stu_name Stu_sub
100 vinod computer
101 raju math
102 ranjan bio
103 Aman phy

Output of program:

C:\vinod\jdbc\jdbc\jdbc-mysql>javac ChangeColumnName.java

C:\vinod\jdbc\jdbc\jdbc-mysql>java ChangeColumnName
Change column name in a database table example!
Enter table name:
Student
Enter old column name:
Stu_roll
Enter new column:
Stu_id
Enter data type:
integer
Query OK, 4 rows affected

After change the table will look like this 

Student Table

Stu_id Stu_name Stu_sub
100 vinod computer
101 raju math
102 ranjan bio
103 Aman phy

Download this example.

Tutorials

  1. Mapping MySQL Data Types in Java
  2. Connecting to a MySQL Database in Java
  3. Creating a Database in MySQL
  4. Creating a Database Table
  5. Creating a MySQL Database Table to store Java Types
  6. Description of Database Table
  7. Deleting a Table from Database
  8. Retrieving Tables from a Database
  9. Inserting values in MySQL database table
  10. Retrieving All Rows from a Database Table
  11. Adding a New Column Name in Database Table
  12. Change Column Name of a Table
  13. Make Unique Column in Database Table
  14. Remove Unique Column in Database Table
  15. Arrange a Column of Database Table
  16. Arrange a Column of Database Table
  17. Sum of Column in a Database Table
  18. Deleting All Rows from a Database Table
  19. Delete a Specific Row from a Database Table
  20. Delete a Column from a Database Table
  21. Join tables in the specific database
  22. Join tables with the NATURAL LEFT JOIN operation
  23. Join tables with the NATURAL RIGHT JOIN operation
  24. Cross Join Tables in a Specific Database
  25. Prepared Statement Set Object
  26. Statement Batch Update
  27. Prepared Statement With Batch Update
  28. Select Records Using Prepared Statement
  29. Update Records using Prepared Statement
  30. Inserting Records using the Prepared Statement
  31. Count Records using the Prepared Statement
  32. Deleting Records using the Prepared Statement
  33. Using the Prepared Statement Twice
  34. Set Data Types by using Prepared Statement
  35. Set byte, short and long data types by using the Prepared Statement
  36. Prepared Statement Set Big Decimal
  37. Set Date by using the Prepared Statement
  38. Set Time by using the Prepared Statement
  39. Set Timestamp by using the Prepared Statement
  40. Copy Table in a MySQL Database