List All Column Names of Table using Java

We can list all column names of table using java.sql.DatabaseMetaData.getColumns() method. The getColumn method accepts String catalog, String schemaPattern, String tableNamePattern and String columnNamePattern parametres. It retrieves a description of table columns available in the specified catalog. The method return ResultSet where each row is a column description.

Example to list all column names of table using java:-

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


public class IsDbExist {

	public static void main(String[] args){

		Connection con = null;
		ResultSet rs = null;

		String url = "jdbc:mysql://localhost:3306/mysql";
		String user = "root";
		String password = "";

		try{

			Class.forName("com.mysql.jdbc.Driver");

			con = DriverManager.getConnection(url, user, password);
			
			if(con != null){
				
				System.out.println("list all column names of table using java");
				
				DatabaseMetaData dbmd = con.getMetaData();

				rs = dbmd.getColumns(null, null, "user", "%");

				while(rs.next()){
					String tablelist = rs.getString("COLUMN_NAME");
					System.out.println(tablelist);   
				}

			}
			else{
				System.out.println("unable to create database connection");
			}
		}
		catch(Exception ex){
			ex.printStackTrace();
		}
		finally{
			if( rs != null){
				try{
					rs.close();
				}
				catch(SQLException ex){
					ex.printStackTrace();
				}
			}
			if( con != null){
				try{
					con.close();
				}
				catch(SQLException ex){
					ex.printStackTrace();
				}
			}
		}
	}
}

output:-

list all column names of table using java

Host
User
Password
Select_priv
Insert_priv
Update_priv
Delete_priv
Create_priv
Drop_priv
Reload_priv
Shutdown_priv
Process_priv
File_priv
Grant_priv
References_priv
Index_priv
Alter_priv
Show_db_priv
Super_priv
Create_tmp_table_priv
Lock_tables_priv
Execute_priv
Repl_slave_priv
Repl_client_priv
Create_view_priv
Show_view_priv
Create_routine_priv
Alter_routine_priv
Create_user_priv
Event_priv
Trigger_priv
Create_tablespace_priv
ssl_type
ssl_cipher
x509_issuer
x509_subject
max_questions
max_updates
max_connections
max_user_connections
plugin
authentication_string
password_expired

Description of parameters available in getColumns() method:-

catalog:- is the name of catalog. it must match with the catalog name stored in the database, the catalog can be null, means should not be used to narrow the search or “” means retrieves those without a catalog.

schemaPattern:- is a schema name pattern. it must match with the schema name stored in the database, schemaPattern can be “” means retrieves those without a schema or null that means schema name should not be used to narrow the search.

tableNamePattern:- is a table name pattern. it must match with the table name stored in the database.

columnNamePattern:- is a column name pattern. it must match with the column name stored in the database.