Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctutorial", "root", "root");

        Statement st = con.createStatement();
        ResultSet rs = st.executeQuery("DESCRIBE myTable");
        ResultSetMetaData md = rs.getMetaData();
        int col = md.getColumnCount();
        for (int i = 1; i <= col; i++) {
            String col_name = md.getColumnName(i);
            System.out.println(col_name);
        }
        DatabaseMetaData dbm = con.getMetaData();
        ResultSet rs1 = dbm.getColumns(null, "%", "myTable", "%");
        while (rs1.next()) {
            String col_name = rs1.getString("COLUMN_NAME");
            String data_type = rs1.getString("TYPE_NAME");
            int data_size = rs1.getInt("COLUMN_SIZE");
            int nullable = rs1.getInt("NULLABLE");
            System.out.println(col_name + " " + data_type + "(" + data_size + ")");
            if (nullable == 1) {
                System.out.println("YES");
            } else {
                System.out.println("NO");
            }
        }
    }
}