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How to get all the column names from a ResultSet using JDBC
You can get the name of a particular column using the getColumnName() method of the ResultSetMetadata interface.
This method accepts an integer value representing the index of a column and returns a String value representing the name of the specified column.
Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below −
CREATE TABLE MyPlayers( ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), PRIMARY KEY (ID) );
Now, we will insert 7 records in MyPlayers table using INSERT statements −
insert into MyPlayers values(1, 'Shikhar', 'Dhawan', DATE('1981-12-05'), 'Delhi', 'India');
insert into MyPlayers values(2, 'Jonathan', 'Trott', DATE('1981-04-22'), 'CapeTown', 'SouthAfrica');
insert into MyPlayers values(3, 'Kumara', 'Sangakkara', DATE('1977-10-27'), 'Matale', 'Srilanka');
insert into MyPlayers values(4, 'Virat', 'Kohli', DATE('1988-11-05'), 'Delhi', 'India');
insert into MyPlayers values(5, 'Rohit', 'Sharma', DATE('1987-04-30'), 'Nagpur', 'India');
insert into MyPlayers values(6, 'Ravindra', 'Jadeja', DATE('1988-12-06'), 'Nagpur', 'India');
insert into MyPlayers values(7, 'James', 'Anderson', DATE('1982-06-30'), 'Burnley', 'England');Following JDBC program establishes connection with the database, retrieves the contents of the table named MyPlayers in to a ResultSet object, gets the column names of the table using the getColumnName() method and displays them.
Example
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
public class RS_AllColumnNames {
public static void main(String args[]) throws Exception {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating a Statement object
Statement stmt = con.createStatement();
//Retrieving the data
ResultSet rs = stmt.executeQuery("select * from MyPlayers");
//Retrieving the ResultSetMetadata object
ResultSetMetaData rsMetaData = rs.getMetaData();
System.out.println("List of column names in the current table: ");
//Retrieving the list of column names
int count = rsMetaData.getColumnCount();
for(int i = 1; i<=count; i++) {
System.out.println(rsMetaData.getColumnName(i));
}
}
}Output
Connection established...... List of column names in the current table: ID First_Name Last_Name Date_Of_Birth Place_Of_Birth Country
Updated on: 30-Jul-2019
12K+ Views
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