JDBC Meta Data Get tables

JDBC Meta Data is the collective information about the data structure and property of a column available in table. The meta data of any table tells you the name of the columns,datatype used in column and constraint used to enter the value of data into column of the table.

Understand with Example

The Tutorial helps you to know understand an example from JDBC Metadata Get table. In this program, the code describe you JDBC Meta Data Get tables that explain the column property and structure of table. The class Jdbc MetaDataGettables include the list of methods to get the meta data property of table as given follow -

  Loading a driver by calling a class.forname( ),this accept driver class as argument.

  DriverManager.getConnection ( ) -This method return you a connection object and built a connection between url and database. Once a connection is built, a front end can access, insert ,update and retrieve the data in the backend database.

  con.createStatement ( ) -This is used to create a sql object. An object of connection class is used to send and create a sql query in the database backend.

   executeQuery ( ) -The method  retrieve a record set from a table in database. The retrieve record set is assigned to a result set.

   getMetaData ( ) - The Result Set call get Metadata( ),which return you the property of the retrieve record set (length,field,column).Meta Data  account for data element and its attribute.

  getcolumncount  ( ) -The method return you a integer data type and provides you the number of column in the Result set object.

Finally the println print the table name, field, size and data type.

In case there is an exception in the try block The subsequent catch block caught and handle the exception.

import java.sql.*;

public class JdbcMetaDataGettables {

    static public final String driver = "com.mysql.jdbc.Driver";
    static public final String connection =
            "jdbc:mysql://localhost:3306/komal";
    static public final String user = "root";
    static public final String password = "root";

    public static void main(String args[]) {

        try {
            Class.forName(driver);
            Connection con =
                    DriverManager.getConnection(connection, user, password);

            Statement st = con.createStatement();

            String sql = "select * from person";
            ResultSet rs = st.executeQuery(sql);
            ResultSetMetaData metaData = rs.getMetaData();

            int rowCount = metaData.getColumnCount();

            System.out.println("Table Name : " + metaData.getTableName(2));
            System.out.println("Field  \tsize\tDataType");

            for (int i = 0; i < rowCount; i++) {
                System.out.print(metaData.getColumnName(i + 1) + "  \t");
                System.out.print(metaData.getColumnDisplaySize(i + 1) + "\t");
                System.out.println(metaData.getColumnTypeName(i + 1));
            }

        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output

Table Name : person
Field  	size	DataType
id  	2	VARCHAR
cname  	50	VARCHAR
dob  	10	DATE

Download code