How to get the datatype of a column of a table using JDBC?

You can get the datatype of a column of a table using the getColumnType() method of the ResultSetMetaData class.

//Retrieving the ResultSetMetaData object ResultSetMetaData rsmd = rs.getMetaData(); //getting the column type String column_name = rsmd.getColumnTypeName(2);

Assume we have a table named employee_data in the database with the description as shown below:

+----------+--------------+------+-----+---------+-------+ | Field    | Type         | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+-------+ | id       | int(11)      | YES  |     | NULL    | | | Name     | varchar(255) | YES  |     | NULL    | | | Dob      | date         | YES  |     | NULL    |     | | Location | varchar(255) | YES  |     | NULL    |       | +----------+--------------+------+-----+---------+-------+

Following JDBC program establishes connection with the database, retrieves the ResultSetMetaData object of the employee_data table, and prints the datatype of the third column.

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.Statement; public class TypeOfColumn {    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();       ResultSet rs = stmt.executeQuery("select * from employee_data");       //Retrieving the ResultSetMetaData object       ResultSetMetaData rsmd = rs.getMetaData();       //getting the column type       String column_name = rsmd.getColumnTypeName(3);       System.out.println("Data type of the column with the specified index is: "+column_name); } }

Output

Connection established...... Data type of the column with the specified index is: DATE